JP2003024310A - Anaerobic threshold detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anaerobic threshold detector capable of detecting an anaerobic threshold by a portable device in a noninvasive state. SOLUTION: This anaerobic threshold detector 10 is provided with an exercise intensity detection part 46, a pulse wave detection part 60 for detecting a pulse wave at a periphery in a noninvasive state, a transmission function storage part 26 for storing a transmission function calculated previously by using a pulse wave form and blood pressure waveform at the periphery, a blood pressure waveform calculating part 24 for calculating the blood pressure waveform corresponding to the pulse waveform by using the pulse waveform at the periphery detected newly by the detection part 60 and the transmission function, a blood pressure waveform index leading out part 30 for leading out the index of the calculated blood pressure, and an anaerobic threshold leading out part 38 for leading out the anaerobic threshold expressed as the numerical value of exercise intensity by using data in a storage part 34 for connecting and storing the exercise intensity and the blood pressure waveform index in the given range of the exercise intensity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anoxic work threshold detection device for deriving an anoxic work threshold expressed as exercise intensity.

[0002]

Background Art and Problems to be Solved by the Invention An anoxic work threshold (AT: anaerobic threshold), which expresses a threshold value for switching from aerobic exercise to anoxic exercise as a numerical value of exercise intensity or oxygen uptake, is It is known to be a useful index for evaluating the effect of exercise on the functions of the circulatory system and the circulatory system, and for selecting an appropriate exercise intensity in sports training. The detection of the anoxic work threshold is a value of the lactate threshold (LT: LT), which is a numerical value of exercise intensity or oxygen uptake in which the lactate concentration in blood starts to increase rapidly.
Ventilation threshold (VT: ve), which is the value of exercise intensity or oxygen uptake, at which the rate of increase in carbon dioxide in exhalation with detection of lactic threshold) or increase in exercise intensity increases
ntilatory threshold) detection.

However, the measurement of lactic acid level in blood is
Because blood collection is necessary, it must be done invasively,
It is difficult to carry out easily with the exercise.

The monitoring of the oxygen uptake amount and the carbon dioxide generation amount, which is performed to detect the ventilation threshold value, is performed by breathing through a mouthpiece connected to a conduit extending from the device to measure the amount and composition of inhalation and exhalation. Because it is necessary to measure
Requires extensive equipment.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an anoxic work threshold detection device capable of exhibiting at least one of the following operational effects.

1) The anoxic work threshold can be detected non-invasively.

2) The anaerobic threshold can be detected by a small portable device.

[0008]

Means for Solving the Problems (1) An anoxic work threshold detecting device according to the present invention comprises an exercise intensity detecting unit for detecting exercise intensity, a blood pressure detecting unit for non-invasively detecting blood pressure,
From the blood pressure waveform detected by the blood pressure detection unit, a blood pressure waveform index derivation unit that derives an index of the blood pressure waveform, and the exercise intensity and the blood pressure waveform index are associated with each other over a given range of the exercise intensity. It is characterized by comprising a storage unit for storing and an anaerobic work threshold deriving unit for deriving an anaerobic work threshold expressed as the exercise intensity using the data stored in the storage unit.

According to the present invention, the blood pressure waveform index deriving unit derives a blood pressure waveform index from the blood pressure waveform detected by the blood pressure detection unit over a given range of exercise intensity detected by the exercise intensity detection unit, The index of the blood pressure waveform associated with the exercise intensity is stored in the storage unit. Then, the anoxic work threshold deriving unit uses the data stored in the storage unit to derive the anaerobic threshold represented as a numerical value of exercise intensity. Therefore, it is not necessary to attach a mouthpiece connected to a conduit extending from the device or collect blood. As a result, the anoxic work threshold can be detected non-invasively with a small portable device. (2) An anoxic work threshold detecting device according to the present invention comprises an exercise intensity detecting section for detecting exercise intensity, a pulse wave detecting section for non-invasively detecting a pulse wave in the peripheral, and the peripheral detected in advance. And a transfer function storage unit that stores a transfer function calculated in advance using a blood pressure waveform corresponding to the pulse wave waveform, and a pulse wave in the periphery newly detected by the pulse wave detection unit. Using the waveform and the transfer function, a blood pressure waveform calculating unit that calculates a blood pressure waveform corresponding to the pulse waveform and a blood pressure waveform calculated by the blood pressure waveform calculating unit derives an index of the blood pressure waveform. A blood pressure waveform index deriving unit, a storage unit that stores the exercise intensity and the blood pressure waveform index in association with each other over a given range of the exercise intensity, using data stored in the storage unit,
And an anaerobic work threshold deriving unit that derives an anaerobic work threshold expressed as a numerical value of the exercise intensity.

Here, the "preliminarily detected peripheral pulse wave waveform" is detected by, for example, a pulse wave detecting device or the pulse wave detecting section formed similarly to the pulse wave detecting section.

According to the present invention, the blood pressure waveform calculating section uses the peripheral pulse wave waveform and the transfer function detected by the pulse wave detecting section over a given range of the exercise intensity detected by the exercise strength detecting section. The blood pressure waveform index deriving unit derives the blood pressure waveform index from the calculated blood pressure waveform, and the blood pressure waveform index is stored in the storage unit in association with the exercise intensity. And
The anoxic work threshold deriving unit uses the data stored in the storage unit to derive an anaerobic threshold represented as a numerical value of exercise intensity. Therefore, it is not necessary to attach a mouthpiece connected to a conduit extending from the device or collect blood.
As a result, the anoxic work threshold can be detected non-invasively with a small portable device.

(3) An anoxic work threshold value detecting device according to the present invention comprises an exercise intensity detecting section for detecting exercise intensity, a pulse wave detecting section for non-invasively detecting a peripheral pulse wave, and the pulse wave. A blood pressure measuring unit that measures blood pressure in the vicinity of a region where the detecting unit detects a pulse wave, and a blood pressure value measured by the blood pressure measuring unit is used, and the pulse wave waveform detected by the pulse wave detecting unit is the blood pressure waveform in the periphery. To a blood pressure waveform obtained by the conversion unit, a blood pressure waveform index derivation unit that derives an index of the blood pressure waveform, and the exercise intensity and the blood pressure waveform over a given range of the exercise intensity. A storage unit that stores the index in association with each other, and using the data stored in the storage unit, an anoxic work threshold derivation unit that derives an anoxic work threshold value represented as a numerical value of the exercise intensity, Characterized by having ing.

According to the present invention, the blood pressure waveform is converted from the blood pressure waveform obtained by converting the peripheral pulse wave waveform detected by the pulse wave detector over a given range of exercise intensity detected by the exercise intensity detector. The index deriving unit derives the blood pressure waveform index, and the blood pressure waveform index is stored in the storage unit in association with the exercise intensity. Then, the anoxic work threshold deriving unit uses the data stored in the storage unit to derive the anaerobic threshold represented as a numerical value of exercise intensity. Therefore, it is not necessary to attach a mouthpiece connected to a conduit extending from the device or collect blood. As a result, the anoxic work threshold can be detected non-invasively with a small portable device.

(4) The anoxic work threshold value detecting device according to the present invention comprises an exercise intensity detecting section for detecting exercise intensity, a pulse wave detecting section for non-invasively detecting a peripheral pulse wave, and the pulse wave. A blood pressure value storage unit that stores a blood pressure value measured in advance in the vicinity of a region where the detection unit detects the pulse wave, and a blood pressure value stored in the blood pressure value storage unit, and the pulse wave detected by the pulse wave detection unit A conversion unit that converts the waveform to the blood pressure waveform in the periphery, from the blood pressure waveform obtained by the conversion unit, a blood pressure waveform index derivation unit that derives an index of the blood pressure waveform, and over a given range of the exercise intensity, An anoxic that derives an anoxic work threshold represented as a numerical value of the exercise intensity using a storage unit that stores the exercise intensity and the blood pressure waveform index in association with each other and data stored in the storage unit. Work threshold derivation part, It is characterized by having.

According to the present invention, the blood pressure waveform is converted from the blood pressure waveform obtained by converting the peripheral pulse wave waveform detected by the pulse wave detector over a given range of exercise intensity detected by the exercise intensity detector. The index deriving unit derives the blood pressure waveform index, and the blood pressure waveform index is stored in the storage unit in association with the exercise intensity. It should be noted that the blood pressure value stored in the blood pressure value storage unit is used in the conversion from the pulse wave waveform to the blood pressure waveform, so that it is not necessary to provide a blood pressure measurement unit. Then, the anoxic work threshold deriving unit uses the data stored in the storage unit to derive the anaerobic threshold represented as a numerical value of exercise intensity. Therefore, it is not necessary to attach a mouthpiece connected to a conduit extending from the device or collect blood. As a result, the anoxic work threshold can be detected non-invasively with a small portable device.

(5) The pulse wave detecting section may be formed so as to detect a volume pulse wave that varies in accordance with the blood flow rate as a variation in the amount of red blood cells in capillaries existing near the skin.

The plethysmogram, which changes according to the blood flow, can be regarded as a change in the amount of red blood cells in the capillary network existing near the skin. This variation can be detected as, for example, a change in the amount of light transmitted or reflected on the skin, and thus can be detected without adjusting the sensor to the position of the peripheral artery, for example, the radial artery. Therefore, the pulse wave detection unit can stably detect fluctuations in the amount of red blood cells in capillaries existing near the skin as pulse waves (volume pulse waves) in peripheral arteries.

(6) The transfer function storage unit stores a plurality of transfer functions corresponding to different pulse rates, and the blood pressure waveform calculation unit calculates the pulse rate derived from the pulse wave detected by the pulse wave detection unit. The blood pressure waveform may be calculated by selecting a transfer function corresponding to the above from the plurality of transfer functions and using it.

According to the present invention, the blood pressure waveform in the pulse wave detected by the pulse wave detector can be derived with high accuracy regardless of the activity state of the subject.

(7) The transfer function storage unit stores a plurality of transfer functions corresponding to different ages, and the blood pressure waveform calculation unit corresponds to the age of the subject whose pulse wave detection unit detects a pulse wave. The blood pressure waveform may be calculated by using a transfer function selected from the plurality of transfer functions.

According to the present invention, the blood pressure waveform in the pulse wave detected by the pulse wave detector can be derived with high accuracy regardless of the age of the subject.

(8) The transfer function storage unit stores a plurality of transfer functions corresponding to different physiological ages, and the blood pressure waveform calculation unit includes the physiology of the subject whose pulse wave detection unit detects a pulse wave. The blood pressure waveform may be calculated using a transfer function corresponding to a specific age selected from the plurality of transfer functions.

According to the present invention, the blood pressure waveform in the pulse wave detected by the pulse wave detecting section can be derived with high accuracy regardless of the physiological age of the subject.

(9) The index derived by the blood pressure waveform index deriving unit may be diastolic blood pressure.

(10) The index derived by the blood pressure waveform index deriving unit may be average blood pressure.

(11) The index derived by the blood pressure waveform index deriving unit may be the differential pressure between the presystolic blood pressure and the blood pressure at the notch.

(12) The index derived by the blood pressure waveform index deriving unit may be the ratio of the presystolic blood pressure to the blood pressure at the notch.

(13) The index derived by the blood pressure waveform index deriving unit may be a pulse pressure as a differential pressure between the systolic blood pressure and the diastolic blood pressure.

(14) The index derived by the blood pressure waveform index deriving unit may be a ratio of the early systolic blood pressure and the late systolic blood pressure.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described more specifically with reference to the drawings.

1. <First Embodiment> 1.1 Appearance Configuration of Anoxic Work Threshold Detection Device A part of the anoxic work threshold detection device 10 according to the present embodiment excluding an exercise intensity detection unit is, for example, FIG. 1
An external configuration as shown in FIGS. 1B and 1C can be employed. The anoxic work threshold detection device 10 includes a device body 12 having a wristwatch-like structure and the device body 1
The cable 58 is connected to the second connector section 20 via the connector piece 57, and the pulse wave detection section 60 is provided on the tip side of the cable 58. A wrist band 56 is attached to the device body 12, and the device body 12 is attached to the wrist of the subject by the wrist band 56.

The apparatus main body 12 is provided with a connector portion 20, and a connector piece 57 which is an end portion of a cable 58 is detachably attached to the connector portion 20.

FIG. 1C shows the connector portion 20 from which the connector piece 57 has been removed. For example, the connector portion 21 is provided with a connection pin 21 to the cable 58, an LED 22 for data transfer, and a phototransistor 23. There is.

Further, on the surface side of the apparatus main body 12, a display section 54 composed of a liquid crystal panel is provided. Display unit 54
Has a segment display area, a dot display area, and the like, and displays information such as a blood pressure waveform, a blood pressure waveform index, or an anoxic work threshold value. The display unit 54 may be configured using another display device instead of the liquid crystal panel.

Inside the apparatus main body 12, a CPU (central processing unit) for controlling various calculations and conversions,
A memory for storing a program for operating the CPU and the like is provided (not shown), and a button switch 14 for performing various operations and inputs is provided on the outer peripheral portion of the apparatus body 12.

On the other hand, as shown in FIG. 1B, the pulse wave detector 60 is mounted near the base of the subject's index finger while being shielded from light by the sensor fixing band 62. In this way, when the pulse wave detection unit 60 is attached near the base of the finger,
Since the cable 58 is short, it does not get in the way even if it is attached. Further, since the change in blood flow due to the temperature is smaller in the vicinity of the base of the finger than in the fingertip, the influence of the temperature or the like on the detected pulse wave waveform is relatively small.

The exercise intensity detector can be configured to include an acceleration sensor (not shown). The acceleration sensor is used by being attached to, for example, an upper limb, a lower limb, or a waist of a subject.

1.2 Functional Configuration of Anoxic Work Threshold Detection Device FIG. 2 shows an anoxic work threshold detection device 1 according to the present embodiment.
It is a block diagram which shows the functional structure of 0. As shown in this figure, the anoxic work threshold detection device 10 includes a pulse wave detection unit 60, a transfer function storage unit 26, a blood pressure waveform calculation unit 24, a blood pressure waveform index calculation unit 30, a storage unit 34, an exercise intensity detection unit. Four
6, an anoxic work threshold derivation unit 38, a display unit 54, and a control unit 50. It should be noted that each of these units may be incorporated in the apparatus main body 12, or may be formed separately from the pulse wave detection unit 60 and the display unit 54 so that the pulse wave detection unit 60, the display unit 54, and the like are electrically connected. May be connected physically.

The pulse wave detecting section 60 includes an LED 64 and a phototransistor 65 as shown in a circuit diagram of FIG. 3, for example.
It is configured to detect pulse waves in the periphery non-invasively, that is, without breaking the skin. The pulse wave detection unit 60 utilizes the fact that the pulse wave waveform is substantially the same as the fluctuation waveform (volume pulse wave waveform) of the blood flow rate, and thus the light irradiation to the artery and the fluctuation of the reflected light amount due to the blood in the artery are performed. Alternatively, a pulse wave as a volume pulse wave is detected by using an optical sensor formed so as to detect a change in the amount of transmitted light.

More specifically, in the pulse wave detecting section 60, when the switch SW is turned on and the power supply voltage is applied, light is emitted from the LED 64. This irradiation light is received by the phototransistor 65 after being reflected by the blood vessel or tissue of the subject. Therefore, the photocurrent of the phototransistor 65 converted into a voltage is output as the signal MH of the pulse wave detector 60.

Here, the emission wavelength of the LED 64 is selected near the absorption wavelength peak of hemoglobin in blood. Therefore, the light receiving level changes according to the blood flow rate. Therefore, the pulse wave waveform is detected by detecting the light reception level. For example, as the LED 64, I
nGaN-based (indium-gallium-nitrogen-based) blue L
ED is preferred. The emission spectrum of this LED is 4
The emission peak is around 50 nm, and the emission wavelength range is 3
It can be in the range of 00 nm to 600 nm.

As the phototransistor 65 corresponding to the LED having such a light emitting characteristic, in the present embodiment, for example, a GaAsP system (gallium-arsenic-phosphorus system) is used.
Can be used. The light receiving wavelength region of the phototransistor 65 is such that the main sensitivity region is in the range of 300 nm to 600 nm, and the sensitivity region can be set to 300 nm or less.

By combining the blue LED 64 and the phototransistor 65 as described above, the pulse wave can be detected in the overlapping wavelength range of 300 nm to 600 nm, which has the following advantages.

First, of the light included in the outside light, the wavelength is 7
Light having a wavelength of 00 nm or less tends not to easily pass through the tissue of the finger, and thus even when external light is applied to the portion of the finger not covered with the sensor fixing band, it reaches the phototransistor 65 through the tissue of the finger. Only light in the wavelength range that does not affect the detection reaches the phototransistor 65. on the other hand,
Light having a wavelength shorter than 300 nm is almost absorbed by the skin surface. Therefore, even if the light receiving wavelength range is 700 nm or less, the substantial light receiving wavelength range is 300 nm to 700 nm.
Becomes Therefore, the influence of external light can be suppressed without covering the finger with a large area. Further, hemoglobin in blood has a large absorption coefficient for light with a wavelength of 300 nm to 700 nm, which is several times to about 100 times or more larger than the absorption coefficient for light with a wavelength of 880 nm. Therefore, as in this example, when light in the wavelength region (300 nm to 700 nm) having a large light absorption characteristic is used as the detection light in accordance with the light absorption characteristic of hemoglobin, the detected value changes sensitively according to the change in blood volume. Therefore, the SN ratio of the pulse wave waveform MH based on the blood volume change can be increased.

As described above, the pulse wave detecting section 60 catches the pulse wave, that is, the volume pulse wave, which changes in accordance with the blood flow volume, as the fluctuation of the red blood cell volume in the capillary network existing near the skin, and irradiates the skin. Since it can be detected as a change in the amount of transmitted light or the amount of reflected light, it can be detected without adjusting the sensor to the position of the peripheral artery, for example, the radial artery or the lateral artery. Therefore, the pulse wave detection unit 60 can stably detect fluctuations in the amount of red blood cells in capillaries existing near the skin as pulse waves (volume pulse waves) in peripheral arteries.

The transfer function storage unit 26 stores a blood pressure waveform at a given site, for example, a central blood pressure waveform previously measured by a microsphygmomanometer using a catheter, that is, a blood pressure waveform at the aortic origin, and the pulse wave detection unit 60 described above. The transfer function calculated in advance is stored using the peripheral pulse wave waveform detected in advance. FIGS. 4A and 4B show an example of such a transfer function as a graph of coefficients and phases for each harmonic.

The transfer function storage unit 26 stores the pulse wave waveform previously detected by the pulse wave detecting device formed similarly to the pulse wave detecting unit 60 and the blood pressure waveform of a given site which is invasively measured in advance. The transfer function calculated in advance may be stored using and. It is also known that this transfer function does not differ significantly among individuals, so a general-purpose transfer function that is generally applicable may be used.

The blood pressure waveform calculation unit 24 includes a transfer function storage unit 2
Using the transfer function stored in 6 and the peripheral pulse wave waveform detected by the pulse wave detector 60, the blood pressure waveform at the above-described given site corresponding to the pulse wave waveform is calculated. For example, the blood pressure waveform calculation unit 24 Fourier transforms the peripheral pulse wave waveform detected by the pulse wave detection unit 60, divides it by the transfer function stored in the transfer function storage unit 26, and Fourier transforms the result. The blood pressure waveform at the above-mentioned given site is calculated by performing the inverse conversion.

The blood pressure waveform index deriving unit 30 derives an index of the blood pressure waveform from the blood pressure waveform calculated by the blood pressure waveform calculating unit 24. Then, the blood pressure waveform index deriving unit 30
Outputs the derived blood pressure waveform index to the storage unit 34 and the display unit 54. Blood pressure waveform index deriving unit 30
Is configured to include, for example, a CPU and a memory in which a program for operating the CPU is stored.

The central blood pressure waveform will be described with reference to the typical central blood pressure waveform shown in FIG. 5, that is, the blood pressure waveform at the aortic origin. As shown in this figure, central blood pressure waveforms may be compared using features such as pre-systolic blood pressure, late systolic blood pressure, diastolic blood pressure, and dicrotic notch.

The blood pressure waveform index deriving unit 30 determines, for example, from such a blood pressure waveform, the diastolic blood pressure, the average blood pressure, the differential pressure between the presystolic blood pressure and the blood pressure at the notch, the presystolic blood pressure and the notch. The blood pressure ratio, the pulse pressure which is the differential pressure between the systolic blood pressure and the diastolic blood pressure, or the ratio between the systolic blood pressure and the late systolic blood pressure is derived as an index. The average blood pressure is obtained by integrating the blood pressure waveform over an integer period and dividing the result by the time corresponding to the integration interval.

The exercise intensity detector 46 includes an acceleration sensor 47.
And the work intensity calculation unit 48, and detects the work rate (W) of the work performed by the subject. The acceleration sensor 47 is used by being attached to an upper limb, a lower limb, a waist, or the like of a subject.

The inventor of the present application has found that there is a substantially proportional relationship between the acceleration sensor strength represented by the following equation and the power of a specific exercise performed by the subject. In addition,
The proportional coefficient k is a coefficient (activity amount coefficient) determined by the type of exercise, and is measured in advance for each type of exercise,
The exercise intensity calculation unit 48 can be used.

Acceleration sensor strength = X (A ₁ ² + A ₂ ² +
A ₃ ² + ...) ^1/2 Here, X is the cycle number A _n of the exercise per unit time, and the acceleration value (peak value or average value) in cycle n.

Then, the number X of cycles of exercise in a unit time and the acceleration value A _n in cycle n are detected by the intensity calculator 48 analyzing the output from the exercise acceleration sensor 47.

Therefore, for example, when the acceleration sensor 47 is mounted near the ankle of a subject who exercises on a bicycle, the exercise intensity detection unit 46 causes the exercise intensity calculation unit 48 to perform the exercise based on the acceleration data detected by the acceleration sensor 47. The number of cycles X per unit time and the acceleration value An in cycle n can be extracted to detect the work rate of the exercise performed by the subject, that is, the exercise intensity.

The exercises carried out by the subject include the above-mentioned pedaling exercises of the bicycle, walking exercises, running exercises,
Various types of exercise can be used, such as step exercises. The above-described activity amount coefficient k is calculated in advance for each type of exercise including these, and for each attachment site of the acceleration sensor 47, so that the exercise intensity calculation unit 48 can be used. For example, the activity amount coefficient k in the pedaling exercise of the bicycle can be calculated using the work amount detected by the bicycle ergometer and the acceleration sensor intensity measured in the exercise.

The storage unit 34 is a semiconductor memory, or
It is configured as a combination of a storage medium using magnetism or light and a semiconductor memory, and stores the exercise intensity and the blood pressure waveform index in association with each other over a preset range of the exercise intensity.

The anoxic work threshold derivation unit 38 is provided in the storage unit 3.
The data stored in 4 is used to derive an anoxic work threshold expressed as exercise intensity.

Here, in order to explain the operation of the anoxic work threshold value deriving unit 38, the facts found regarding the relationship between exercise intensity and blood pressure will be described. Figure 6 shows R. Nagaya,
Paper by Y. Kawabata, M. Tanaka et al. “Mean Blood Press
ure Increases Above the Ventilatory Threshold ”(H.
Tanaka, M. Shindo, “Exercise for Preventing Commo
n Diseases, ”pp. 181-184, Springer, 2000). This data imposes exercise on a bicycle ergometer on healthy adults aged 22 to 25,
This is a typical example of the result of measuring blood pressure by cycling with 10 W of exercise for the first 4 minutes and then increasing the exercise by 1 W every 4 seconds. In addition, the measurement of blood pressure is
This is performed by an applanation pressure measurement method in which blood pressure is detected by measuring pressure with a pressure sensor being pressed against an artery so that a part of the blood vessel wall is flattened. Further, in this graph, the ventilatory work threshold value (Ventilatory Threshold) calculated based on the data obtained by the flow meter connected to the mouthpiece is also shown as VT.

From this graph, the inventor of the present invention can determine that the mean blood pressure, diastolic blood pressure, and pulse pressure are the ventilatory work threshold (V
It was found that the tendency clearly changed after the exercise intensity of (T). That is, mean blood pressure and diastolic blood pressure are
Up to the ventilation work threshold, it decreases almost linearly as the exercise intensity increases, and after passing the ventilation work threshold, it increases almost linearly as the exercise intensity increases. Further, also in the systolic blood pressure, when the ventilation work threshold is exceeded, the slope of blood pressure increase increases. Further, the pulse pressure, which is the differential pressure between the systolic blood pressure and the diastolic blood pressure, is determined by comparing the systolic blood pressure and the diastolic blood pressure in FIG.
The present inventor has found that, up to T), the rate of increase increases linearly at a relatively high rate of increase, but when the rate of ventilation exceeds the threshold of ventilation, the rate of increase increases linearly at a rate of decrease lower than that of ventilation threshold. Therefore, the ventilatory work threshold or the anoxic work threshold is obtained by approximating a graph of changes in diastolic blood pressure, mean blood pressure, systolic blood pressure, or pulse pressure with respect to changes in exercise intensity with two straight lines and intersecting them. It can be seen that it can be obtained as the exercise intensity at.

Here, a specific example of the derivation of the anoxic work threshold value in the anoxic work threshold value derivation unit 38 will be described with reference to the flowchart shown in FIG. First, the anoxic work threshold deriving unit 38 determines that the first one point within a given range of exercise intensity is a virtual anoxic work threshold (S1), and, for example, measured diastolic blood pressure data. Based on the above, the two straight lines bordering on the virtual anoxic work threshold are determined by linear regression (S2), and these straight lines are stored (S2).
3). Then, while increasing the hypothetical anaerobic threshold by unit exercise intensity (FIG. 4), determination of such a straight line is repeated for each point within a given range of exercise intensity (FIG. 4, FIG. 5, FIG. S2). Next, for those two straight line approximations, the error sum of squares with the actual data is obtained, and the two straight line approximation that gives the smallest error sum of squares is selected (FIG. 6). Finally, the exercise intensity at the intersection of the two selected straight lines is calculated as the anoxic work threshold (FIG. 7).

The display unit 54 displays the blood pressure waveform calculated by the blood pressure waveform calculation unit 24, the index derived by the blood pressure waveform index deriving unit 30, or the anaerobic work threshold value derived by the anaerobic work threshold value deriving unit 38. Display information as characters, symbols, or graphs.

The control unit 50 comprises a CPU and a memory in which a program for operating the CPU is stored, and controls the operation of each unit described above.

1.3 Operation of Anoxic Work Threshold Detection Device The anoxic work threshold detection device 10 operates as follows, for example, to estimate the blood pressure waveform of the subject and analyze it.

First, the wristband 56 of the anoxic work threshold detecting device 10 formed in a watch shape is wound around the wrist. Then, the pulse wave detection unit 60 is shown in FIG.
As shown in (B), the subject is attached near the base of the index finger, the connector piece 57 is attached to the connector section 20 of the apparatus body 12, and the pulse wave detection section 60 is connected to the apparatus body 12.

The acceleration sensor 47 of the exercise intensity detector 46 is attached to a given part of the subject, such as the ankle.

Next, when a detection instruction is input to the control unit 50 by a predetermined operation of the button switch 14 or utterance of a predetermined voice pattern, the pulse wave detection unit 60 starts detection of pulse waves. That is, when the detection instruction is input, the phototransistor 65 detects the light amount that changes in response to the change in the blood flow amount in the capillary network of the finger, and the pulse wave detection unit 60 corresponds to the change in the detected light amount. The pulse waveform is output as the signal MH to the blood pressure waveform calculator 24.

Then, the blood pressure waveform calculation unit 24 receives the pulse wave waveform input from the pulse wave detection unit 60 and the transfer function storage unit 26.
Using the transfer function stored in, the blood pressure waveform corresponding to the pulse waveform is calculated. The calculated blood pressure waveform is
It is output to the aortic blood pressure waveform index calculation unit 30 and the display unit 54.

The blood pressure waveform index deriving unit 30 to which the blood pressure waveform calculated by the blood pressure waveform calculation unit 24 is input, determines an index of the blood pressure waveform from the blood pressure waveform, for example, diastolic blood pressure, average blood pressure, presystolic blood pressure and cutoff. Pressure difference with blood pressure at the scar, ratio of pre-systolic blood pressure to blood pressure at the notch, pulse pressure which is the differential pressure between systolic blood pressure and diastolic blood pressure, or ratio of the systolic blood pressure and late systolic blood pressure Derive. Then, the blood pressure waveform index deriving unit 3
0 outputs the derived index of the blood pressure waveform to the storage unit 34, the variation analysis unit 38, the comparison analysis unit 46, and the display unit 54. In the variation analysis unit 38 and the comparison analysis unit 46, analysis is performed using the input index.

When a detection instruction is input to the control unit 50 by a predetermined operation of the button switch 14 or utterance of a predetermined voice pattern, that is, at the same time when the above-described pulse wave detection unit 60 starts detecting the pulse wave, the exercise intensity detection unit 46. , The acceleration sensor 47 starts detecting the acceleration. Then, the exercise intensity calculating unit 48 calculates the exercise intensity based on the data detected by the acceleration sensor 47, so that the exercise intensity detecting unit 46 detects the work rate of the exercise performed by the subject, that is, the exercise intensity.

At the same time, the storage unit 34 stores the exercise intensity detected by the exercise intensity detecting unit 46 and the blood pressure waveform index derived by the blood pressure waveform index deriving unit 30 in association with each other over a preset range of the exercise intensity.

Next, the anoxic work threshold derivation unit 38 uses the data stored in the storage unit 34, for example, as described above with reference to FIG. Derive the threshold.

The display unit 54 including, for example, a liquid crystal display device has a blood pressure waveform calculated by the aortic blood pressure waveform calculation unit 24, an index derived by the blood pressure waveform index derivation unit 30, or an anoxic work threshold value. Is displayed as a character or graph.

1.4 Effects of the First Embodiment As described above, the anoxic work threshold detecting device 10 according to the present embodiment has the pulse intensity over the given range of the exercise intensity detected by the exercise intensity detecting section 46. The blood pressure waveform index deriving unit 30 derives an index of the blood pressure waveform from the blood pressure waveform calculated by the blood pressure waveform calculation unit 24 using the peripheral pulse wave waveform detected by the wave detection unit 60 and the transfer function. The waveform index is stored in the storage unit 34 in association with the exercise intensity. Then, the anoxic work threshold deriving unit 38 uses the data stored in the storage unit 34 to derive the anaerobic threshold represented as a numerical value of exercise intensity. Therefore, it is not necessary to attach a mouthpiece connected to a conduit extending from the device or collect blood. As a result, the anoxic work threshold can be detected non-invasively with a small portable device.

2. Second Embodiment The anoxic work threshold value detection device of the second embodiment is different from that of the first embodiment in that it is configured to include a blood pressure measurement unit and a conversion unit. In the following, points different from the first embodiment will be mainly described. The other points are the same as those in the first embodiment, and thus the description thereof will be omitted. Further, the same reference numerals are given to corresponding portions in the drawings.

2.1 Appearance Configuration of Anoxic Work Threshold Detection Device The anaerobic work threshold detection device of this embodiment is, for example, the first
The anaerobic threshold detection device 10 according to the embodiment is configured to have an appearance substantially similar to that of the anoxic work threshold detection device 10 and a blood pressure measurement portion, and is externally configured.

2.2 Functional Configuration of Anoxic Work Threshold Detection Device FIG. 8 shows an anaerobic work threshold detection device 7 according to this embodiment.
It is a block diagram which shows the functional structure of 0. As shown in this figure, the anoxic work threshold detection device 10 according to the first embodiment.
In addition to the respective units in, the blood pressure measurement unit 80 and the conversion unit 72 are provided. Except for these respective units, the respective units of the anoxic work threshold detection device 70 according to the present embodiment are configured in substantially the same manner as the blood pressure estimation device 10 of the first embodiment.

The blood pressure measuring unit 80 measures the blood pressure at the site where the pulse wave detecting unit 60 detects the pulse wave. Blood pressure measurement unit 8
An example of 0 will be described later.

The conversion unit 72 uses the blood pressure value measured by the blood pressure measurement unit 80 to convert the pulse wave waveform detected by the pulse wave detection unit 60 into a blood pressure waveform at that site, that is, in the periphery. For example, the conversion unit 72 converts the pulse wave waveform into a corresponding blood pressure waveform so as to have an amplitude between the diastolic blood pressure and the late systolic blood pressure measured by the blood pressure measurement unit 80.

The blood pressure waveform calculation unit 24 includes the transfer function storage unit 2
Using the transfer function stored in 6 and the blood pressure waveform obtained by the calculation of the conversion unit 72, the blood pressure waveform corresponding to the blood pressure waveform is calculated. For example, the blood pressure waveform calculation unit 24
Is calculated by Fourier transforming the peripheral blood pressure waveform obtained by the calculation of the conversion unit 72, dividing it by the transfer function stored in the transfer function storage unit 26, and performing the inverse Fourier transform of the result.

2.3 Blood Pressure Measuring Unit FIG. 9 is a schematic diagram showing how blood pressure is measured using the blood pressure measuring unit 82 as an example of the blood pressure measuring unit. Further, FIG. 10 is a block diagram showing a functional configuration of the blood pressure measurement unit 80. As shown in FIG. 9, the blood pressure measurement unit 82 wears the band 91 near the base of the finger, which is a region where the pulse wave detection unit 60 detects the pulse wave, and measures the blood pressure. The band-shaped body 91 is provided with a bag-shaped pressure applying portion 89 on its inner surface side, and is wound around a finger so that the pressure applying portion is located at a position facing the lateral digital artery 98.

The pressure applying portion 89 is formed in a bag shape and has a pump 86 and an exhaust valve 88 via a pipe line 87.
Are connected. The volume of the pressure applying unit 89 is controlled by adjusting the amount of the fluid such as air filled in the pressure applying unit 89 by the pump 86, the exhaust valve 88, or the like.
As a result, the pressing force with which the pressure applying unit 89 presses the lateral artery 98 is adjusted.

A pressure sensor 90 for detecting a pressure change of the fluid is attached to the above-mentioned conduit 87.
The pressure sensor 90 includes a pressure applying section 89 and a pressure applying section 8.
It is formed so as to detect the vibration of the lateral digital artery 98 transmitted as a pressure change of the fluid via 9. That is, the pressure applying portion 89 located on the lateral digital artery 98 is pressed according to the vibration of the lateral digital artery 98, so that the pressure of the fluid in the pressure applying portion 89 changes due to the vibration of the lateral digital artery 98. become. Therefore, the pressure sensor 90 that detects such a pressure change can output a signal corresponding to the vibration of the lateral artery 98.

Further, as shown as a part of FIG. 10, the blood pressure measurement unit 82 is configured to include a control unit 84 and a blood pressure determination unit 92 in addition to the above-mentioned units.

The control section 84 includes a pump 86 and an exhaust valve 8
8 is controlled to adjust the amount of fluid filled in the pressure applying section 89 to change the pressure applied by the pressure applying section 89 so that the pressure applying section 89 causes the lateral finger artery 98 to fall within a predetermined range. Control to press with various pressing forces. Control unit 84
Is configured to include, for example, a CPU and a memory in which a program for operating the CPU is stored.

The blood pressure determining unit 92 takes in information on various pressing forces applied by the pressure applying unit 89 from the control unit 84, takes in detection signals from the pressure sensor 90 at each pressing force, and obtains them based on them. First, determine the systolic and diastolic blood pressure. The blood pressure determination unit 92 is, for example, a CPU
And a memory in which a program for operating the CPU is stored.

Here, the operation of the blood pressure measurement unit 82 having the above-described configuration to measure blood pressure will be described.

First, the cuff-shaped strip 91 is wrapped around the base of the finger so that the pressure applying portion 89 is located at the position corresponding to the lateral digital artery 98.

Next, the control unit 84 controls the pump 86 and the exhaust valve 88 to adjust the amount of fluid filled in the pressure applying unit 89 to change the pressure applied by the pressure applying unit 89. The pressure applying unit 89 controls the lateral digital artery 98 to press it with various pressing forces within a predetermined range.
That is, the pressing force of the pressure applying unit 89 is in a range slightly exceeding the range that can be generally encountered as the blood pressure value, for example, 250.
It is controlled by the control unit 84 so as to fall within a range of ˜20 mmHg.

At each pressing force of the pressure applying section 89, the pressure sensor 90 for detecting the vibration of the lateral artery 98 is
A signal corresponding to the vibration of the blood vessel wall due to the blood flow through the blood vessel that has been narrowed by the pressure applying unit 89 is detected. The result is stored in the blood pressure determining unit 92 in association with each pressing force of the pressure applying unit 89. Each pressing force value applied by the pressure applying unit 89 is controlled by the control unit 84 that controls the pressing force.
Is transmitted to the blood pressure determining unit 92.

Next, the blood pressure determining section 92 determines the blood pressure when the pressure applying section 89 distributes the pressure in the above-mentioned setting range and a sufficient number of samples are obtained. That is, the pressure sensor 90 uses the highest pressure applied by the pressure applying unit 89 that detects the vibration associated with the blood flow flowing in the narrowed blood vessel as the systolic blood pressure, and the pressure sensor 90 detects the vibration accompanying the blood flow flowing in the narrowed blood vessel. The lowest pressing force of the pressure applying unit 89 to be detected is determined as the minimum blood pressure. The principle of this blood pressure determination is to monitor the vibration of the blood vessel wall accompanying the blood flow through the blood vessel narrowed by the pressure on the peripheral side of the artery pressed by the arm band while changing the pressure applied to the arm band. It is similar to the blood pressure measurement method for determining blood pressure, so-called auscultation.

2.4 Operation of Anoxic Work Threshold Detection Device The anoxic work threshold detection device 70 of the present embodiment is the same as that of the first embodiment except that the above-described blood pressure measurement operation is added and the following points. It operates similarly to the blood pressure estimation device 10 to estimate the blood pressure waveform of the subject and analyze it.

As in the case of the first embodiment, when the pulse wave waveform as the signal MH detected by the pulse wave detecting section is input, the converting section 72 uses the blood pressure value measured by the blood pressure measuring section 80. , Converts the pulse wave waveform into a blood pressure waveform at the detection site.

Then, the blood pressure waveform calculation unit 24 is provided with the conversion unit 7.
2 and the transfer function storage unit 2
When the transfer function stored in 6 is input, the data is used to calculate the blood pressure waveform corresponding to the blood pressure waveform.

The subsequent operation is the same as in the first embodiment.

2.5 Modification of Second Embodiment 2.5.1 In the description of the present embodiment up to this point, the blood pressure measuring unit 80 that measures the blood pressure at the site where the pulse wave detecting unit 60 detects the pulse wave. An example is shown in which the pulse wave waveform detected by the pulse wave detector 60 is converted into the blood pressure waveform in that portion, that is, in the periphery, using the blood pressure value measured by. However, as shown as a block diagram in FIG. 11, a blood pressure value storage unit 76 that stores a blood pressure value measured in advance at a portion where the pulse wave detection unit 60 detects a pulse wave is provided in place of the blood pressure measurement unit, The conversion unit 72 may convert the pulse wave waveform detected by the pulse wave detection unit 60 into a peripheral blood pressure waveform by using the blood pressure value stored in the blood pressure value storage unit 76.

2.5.2 Further, as shown as a block diagram in FIG. 12, the transfer function storage unit 26 and the blood pressure waveform calculation unit 24 are omitted, and the blood pressure waveform derived by the conversion unit 72 is directly measured by the blood pressure waveform index. It may be input to the derivation unit 30 and the display unit 54. In this case, the blood pressure waveform index deriving unit 30 derives the blood pressure waveform index from the blood pressure waveform obtained by the conversion unit 72.

2.5.3 Further, in the description of the present embodiment up to this point, the pulse wave detection unit 60 detects the pulse wave near the base of the finger, and the blood pressure measurement unit also measures the blood pressure at the same site. An example was given. However, the pulse wave detection unit 60 may detect the pulse wave in the upper arm, and the blood pressure measurement unit may also measure the blood pressure in the upper arm. Alternatively, the pulse wave detection unit 60 may detect the pulse wave in the wrist and the blood pressure may be detected. The measuring unit may also measure blood pressure on the wrist.

The blood pressure measuring unit does not necessarily have to be a device dedicated to this apparatus. For example, a commercially available sphygmomanometer for measuring blood pressure in the upper arm or wrist is used, and the data is converted automatically or via a keyboard or the like. You may make it input into the part 72.

2.6 Effects of the Second Embodiment As described above, the anoxic work threshold detecting device 70 according to the present embodiment has a pulse range over a given range of the exercise intensity detected by the exercise intensity detecting section 46. The blood pressure waveform index deriving unit 30 calculates the blood pressure waveform from the blood pressure waveform calculated by the blood pressure waveform calculation unit 24 using the blood pressure waveform and the transfer function obtained by converting the peripheral pulse wave waveform detected by the wave detection unit 60. Is derived, and the index of the blood pressure waveform is stored in the storage unit 34 in association with the exercise intensity. Then, the anoxic work threshold deriving unit 38 uses the data stored in the storage unit 34 to derive the anaerobic threshold represented as a numerical value of exercise intensity. Therefore, it is not necessary to attach a mouthpiece connected to a conduit extending from the device or collect blood. As a result, the anoxic work threshold can be detected non-invasively with a small portable device.

3. <Third Embodiment> The anoxic work threshold detection device of the third embodiment is different from the first embodiment in that it does not have a pulse wave detection unit, a transfer function storage unit, and a blood pressure waveform calculation unit, and is provided with a blood pressure detection unit. Different from the first embodiment. In the following, points different from the first embodiment will be mainly described. The other points are the same as those in the first embodiment, and thus the description thereof will be omitted. Further, the same reference numerals are given to corresponding portions in the drawings.

3.1 Appearance of Anaerobic Work Threshold Detection Device The anoxic work threshold detection device of this embodiment is shown in FIG.
It can be formed as a necklace type external structure as shown in FIG.

In this figure, the pressure sensor 104 as the blood pressure detecting section 102 is provided at the tip of the cable 112. For example, as shown in FIG.
4 or the like is used to attach the carotid artery of the subject.

Further, in FIG. 13, a main part of this device is incorporated in a device main body 120 shaped like a brooch, and a display section 54,
A button switch 14 is provided. A part of the cable 112 is embedded in the chain 110, and the signal output from the pressure sensor 104 is transmitted to the device main body 120.
Is being supplied to. A CPU (central processing unit) that controls various calculations and conversions is provided inside the apparatus main body 120.
t) and a memory for storing a program for operating the CPU and the like.

The exercise intensity detector can have the same external configuration as that of the first embodiment, for example.

3.2 Functional Configuration of Anoxic Work Threshold Detection Device FIG. 15 is a block diagram showing the functional configuration of the anoxic work threshold detection device 100 according to the present embodiment. As shown in this figure, the anoxic work threshold detection device 100 according to the present embodiment does not include the pulse wave detection unit 60, the transfer function storage unit 26, and the blood pressure waveform calculation unit 24 in the first embodiment. The blood pressure detection unit 102 is provided. Other than this, the respective units of the anoxic work threshold detection device 100 according to the present embodiment are the same as those of the blood pressure estimation device 10 of the first embodiment.
It is configured almost the same as.

The blood pressure detection unit 102 detects blood pressure non-invasively. The blood pressure detection unit 102 uses the pressure sensor 104 to non-invasively detect blood pressure, for example, central blood pressure, that is, blood pressure in the carotid artery that exhibits almost the same blood pressure as that at the aortic root. This blood pressure measurement is performed by, for example, an applanation pressure measurement method in which the blood pressure is detected by measuring the pressure with the pressure sensor being pressed against the artery so that a part of the blood vessel wall is flattened.

The blood pressure waveform index deriving unit 30 includes the blood pressure detecting unit 1.
From the blood pressure waveform detected by 02, the index of the central blood pressure waveform is derived.

3.3 Operation of Anoxic Work Threshold Detection Device The anoxic work threshold detection device 100 of the present embodiment operates in the same manner as the blood pressure estimation device 10 of the first embodiment except for the following points. The subject's anoxic threshold is detected.

First, the chain 110 of the anoxic work threshold detecting device 100 formed in the shape of a necklace is worn around the neck. Then, the pressure sensor 104 as the blood pressure detection unit 102 is
As shown in FIG. 14, using an adhesive tape 114 or the like,
It is attached to the carotid artery of the subject. As a result, the pressure sensor 104 is pressed against the artery so that the blood vessel wall of the carotid artery is partially flattened, and the blood pressure is detected by the applanation pressure measurement method that measures the pressure in that state.

The blood pressure waveform index deriving unit 30 includes the pressure sensor 1
An index of the blood pressure waveform is derived from the blood pressure waveform detected by 04.

Other operations are similar to those of the anoxic work threshold detection device 10 of the first embodiment.

3.4 Effects of Third Embodiment According to the present embodiment, the blood pressure is detected from the blood pressure waveform detected by the blood pressure detecting unit 102 over a given range of the exercise intensity detected by the exercise intensity detecting unit 46. The waveform index deriving unit 30 derives the blood pressure waveform index, and the blood pressure waveform index is stored in the storage unit 34 in association with the exercise intensity. Then, the anoxic work threshold deriving unit 38 uses the data stored in the storage unit 34 to derive the anaerobic threshold represented as a numerical value of exercise intensity. Therefore, the anoxic threshold can be derived without wearing a mouthpiece connected to a conduit extending from the device or collecting blood. As a result, the anoxic work threshold can be detected non-invasively with a small portable device.

4. <Modification> 4.1 In the above-described first and second embodiments, an example in which the pulse wave detection unit 60 uses a sensor using a light emitting element and a light receiving element has been shown. However, the pulse wave detection unit 60 may be a pulse wave detection unit that uses a pressure sensor located on a peripheral artery, for example, a radial artery. in this case,
A pulse wave (pressure pulse wave) is detected using an applanation pressure measurement method in which blood pressure is measured by a pressure sensor pressed against an artery so that a part of the blood vessel wall is flattened.

FIG. 16 and FIG. 17 are views showing a portion of the anoxic work threshold detection device 10a using such a pulse wave detector, excluding the exercise intensity detector, and FIG. 16 is an anoxic work threshold. FIG. 18 is a perspective view showing the outer appearance of the detection device 10a, and FIG. 17 is a perspective view showing a state in which the anoxic work threshold detection device 10a is worn on the wrist.

As shown in these figures, the anoxic work threshold detecting device 10a is provided with a sensor holding portion 67 movably attached to the wrist band 56 along the wrist band 56 attached to the device body 12. Pressure sensor 68 provided so as to project from the sensor holding portion 67.
Is included in the pulse wave detection unit 60a. The pulse wave detection unit 60a and the apparatus main body 12 are provided with wiring (not shown) for transmitting a detection signal or the like from the pulse wave detection unit 60a, such as an FPC.
(Flexible printed circuit) Connected by a board.

Then, the anoxic work threshold detection device 10a.
15, the anoxic work threshold detection device 10a is wrapped around the wrist of the subject so that the sensor holding portion 67 is located near the radial artery 99, as shown in FIG. Then, the pulse wave detection unit 60a provided in the sensor holding unit 67 is positioned, for example, on the radial artery 99,
The sensor holder 67 is slid along the wristband 56 and positioned.

When the pulse wave detector 60a is appropriately pressed against the radial artery 99 of the subject in this manner, the pulse wave corresponding to the vibration of the blood vessel wall due to the change in blood flow in the artery is detected. By being transmitted to 60a, the anoxic work threshold detection device 10a can detect the pulse wave at any time. This pulse wave waveform is detected as a waveform having a shape substantially similar to the blood pressure waveform in the blood vessel.

FIGS. 18 (A) and 18 (B) show an example of the result of calculating the transfer function for the central blood pressure waveform, that is, the blood pressure waveform at the aortic origin, for the pulse wave waveform thus detected in the radial artery, It is shown as a graph of the coefficient and phase for each harmonic. Comparing FIGS. 18 (A) and 18 (B) with FIGS. 4 (A) and 4 (B) described above, the transfer function calculated for the pulse wave waveform of the radial artery in the present modification and the finger base in the first embodiment. It can be seen that the transfer function calculated for the pulse wave waveform (volume pulse wave) detected by the optical sensor for the change in blood flow in the nearby capillary network has almost the same characteristics. Also in this modification, such a transfer function is stored in the transfer function storage unit 26.

4.2 In the first and second embodiments, the transfer function storage unit 26 stores the central blood pressure waveform, that is, the blood pressure waveform at the aortic origin, which is invasively measured in advance by a micro blood pressure monitor using a catheter, for example. , One pulse transfer function calculated in advance by using the above-described pulse wave detection unit 60 or the peripheral pulse wave waveform detected in advance by the pulse wave detection device formed similarly to the pulse wave detection unit 60 I have shown an example.

However, the transfer function storage unit 26 stores a plurality of transfer functions corresponding to different pulse rates, and the blood pressure waveform calculation unit 24 determines the pulse rate derived from the pulse wave detected by the pulse wave detection unit 60. The corresponding transfer function may be selected from the plurality of transfer functions and used to calculate the blood pressure waveform. As a result, the blood pressure waveform is calculated using the transfer function corresponding to the activity state of the subject,
The blood pressure waveform from the pulse wave in the peripheral artery can be derived with high accuracy regardless of the activity state of the subject.

Alternatively, the transfer function storage unit 26 stores a plurality of transfer functions corresponding to different ages, and the blood pressure waveform calculation unit 24 causes the pulse wave detection unit 60 to detect the age or physiological value of the subject whose pulse wave is detected. The blood pressure waveform may be calculated by selecting and using a corresponding transfer function corresponding to age from these plural transfer functions. As a result, since the blood pressure waveform is calculated using the transfer function corresponding to the subject's age or physiological age, the blood pressure waveform can be derived with high accuracy from the pulse wave in the peripheral artery.

4.3 In the first and second embodiments, the case where the portion where the pulse wave detecting section detects the pulse wave is the base of the finger is shown. However, the part where the pulse wave detection unit 60 detects the pulse wave may be any part as long as it has a capillary network in which capillaries are mostly distributed near the skin.

4.4 In each of the above-described embodiments, the blood pressure waveform calculated by the blood pressure waveform calculation unit 24, the blood pressure waveform index derived by the blood pressure waveform index derivation unit 30, or the anoxic work threshold derivation unit 38 is derived. An example has been shown in which information such as the anoxic work threshold value is notified by using the display unit 54 including a display device such as a liquid crystal display device and displaying the information as characters or graphs. However, instead of the display unit 54 or together with the display unit 54, a printer or a device including a voice synthesizer and a speaker is used, and these information is displayed, printed, or voiced as characters or graphs. You may make an announcement.

4.5 In the third embodiment, an example is given in which the anoxic work threshold detection device 100 has a necklace type external configuration. However, the external configuration of the anoxic work threshold detection device 100 according to the third embodiment is as follows.
For example, the following modifications may be performed.

4.5.1 FIG. 19 is an external view showing a modified example in which the anoxic work threshold value detection device 100 in the third embodiment has a spectacle-type external structure.

As shown in this figure, the main body of the apparatus is divided into a case 120a and a case 120b, which are separately attached to the vine 181 and electrically connected to each other via a lead wire embedded in the vine 181. Connected. A liquid crystal panel 183 is attached to a side surface of the case 120a on the lens 182 side, and a mirror 184 is fixed to one end of the side surface at a predetermined angle. Also, case 1
A drive circuit for the liquid crystal panel 183 including a light source (not shown) and a circuit for creating display data are incorporated in the unit 20a, which constitute the display unit 54. The light emitted from this light source is reflected by the mirror 184 via the liquid crystal panel 183 and projected onto the lens 182. Further, the case 120b includes the anaerobic threshold detection device 10.
No. 0 main part is incorporated, and the above-mentioned button switch 14 is provided on the upper surface thereof.

On the other hand, the pressure sensor 104 is connected to the cable 11
It is electrically connected to the case 120b via 2 and is attached to the carotid artery as in the case of the necklace type. The lead wire connecting the case 120a and the case 120b may be made to crawl along the vine 181. Further, in this example, the apparatus main body is divided into the case 120a and the case 120b, but they may be integrated into a case. Furthermore, the mirror 184
As for, a movable type may be used so that the angle with the liquid crystal panel 183 can be adjusted.

4.5.2 FIG. 20 is an external view showing a modification in which the anoxic work threshold detection device 100 according to the third embodiment has a card-shaped external structure.

The card-type device body 190 is, for example, housed in the left chest pocket of the subject. The pressure sensor 104 is electrically connected to the device main body 190 via the cable 112, and is attached to the carotid artery of the subject as in the case of the necklace type or the eyeglass type.

4.6 In the first and second embodiments, the blood pressure waveform measured in advance in the central portion, that is, the aortic origin, and the pulse wave waveform detected in advance by the pulse wave detector 60 are used in advance. An example has been shown in which the transfer function storage unit 26 stores the calculated transfer function, and the blood pressure waveform calculation unit 24 calculates the blood pressure waveform in the center using the transfer function and the newly detected pulse wave waveform. However, using the blood pressure waveform measured in advance in a peripheral artery, such as the radial artery, and the pulse wave waveform detected in advance by the pulse wave detection unit 60, the transfer function storage unit 2 stores the transfer function calculated in advance.
6 may be stored, and the blood pressure waveform calculation unit 24 may calculate the blood pressure waveform in the periphery, for example, the radial artery, using the transfer function and the newly detected pulse wave waveform.

In this case, since the blood pressure waveform is the blood pressure waveform in the peripheral arteries, it is somewhat different from the central arterial waveform. FIG. 21 is a graph showing a typical blood pressure waveform in a peripheral artery, for example, a radial artery. As shown in this figure, the blood pressure waveform in an artery usually has the highest peak (ejection wave), the next highest peak (tidal wave), and the third peak (notch). Wave (dicr
otic wave). The minimum point or inflection point between the tidal wave and the notch is called a notch (dicrotic notch). The peak of the ejection wave corresponds to the systolic blood pressure (systolic blood pressure) BP _sys , which is the highest blood pressure in the blood pressure waveform. Also, diastolic blood pressure (minimum blood pressure) BP _dia is
It corresponds to the lowest blood pressure in the blood pressure waveform. The pressure difference between the systolic blood pressure BP _sys and the diastolic blood pressure BP _dia is called the pulse pressure ΔBP. Furthermore, mean blood pressure BP _mean
Is obtained by integrating the blood pressure waveform and obtaining the time average.

The blood pressure waveform index deriving unit 30, for example, from such peripheral blood pressure waveforms, diastolic blood pressure, mean blood pressure, differential pressure between systolic blood pressure and blood pressure at the notch, systolic blood pressure and regenerative wave peak. It is derived using the ratio with the blood pressure in the above or the pulse pressure which is the differential pressure between the systolic blood pressure and the diastolic blood pressure as an index.

4.7 The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the gist of the present invention or the equivalent range of the claims. .

[Brief description of drawings]

1A, 1B, and 1C are external views of a portion excluding an exercise intensity detection unit in an anoxic work threshold detection device according to a first embodiment.

FIG. 2 is a block diagram showing a functional configuration of the anoxic work threshold detection device according to the first embodiment.

FIG. 3 is a circuit diagram showing an example of a circuit configuration of a pulse wave detection unit.

FIGS. 4A and 4B are diagrams showing an example of a transfer function stored in a transfer function storage unit as a graph of a coefficient and a phase for each harmonic.

FIG. 5 is a diagram showing a typical central blood pressure waveform.

FIG. 6 is a graph showing a typical example of the result of measuring blood pressure while increasing the amount of exercise.

FIG. 7 is a flowchart showing a specific example of deriving an anoxic work threshold value in an anoxic work threshold value deriving unit.

FIG. 8 is a block diagram showing a functional configuration of an anoxic work threshold detection device according to a second embodiment.

FIG. 9 is a schematic diagram showing how blood pressure measurement is performed using a blood pressure measurement unit.

FIG. 10 is a block diagram showing a functional configuration of a blood pressure measurement unit.

FIG. 11 is a block diagram showing a functional configuration of a modified example of the anoxic work threshold detection device according to the second embodiment.

FIG. 12 is a block diagram showing a functional configuration of another modified example of the anoxic work threshold detection device according to the second embodiment.

FIG. 13 is an external view of an anoxic work threshold detection device according to a third embodiment.

FIG. 14 is a diagram showing a state in which the anoxic work threshold detection device shown in FIG. 13 is mounted.

FIG. 15 is a block diagram showing a functional configuration of an anoxic work threshold detection device according to a third embodiment.

FIG. 16 is a perspective view showing an external appearance of a portion excluding the exercise intensity detecting portion in the anoxic work threshold detecting device using the pulse wave detecting portion of the modification.

FIG. 17 is a perspective view showing a state in which the portion of the anoxic work threshold detection device shown in FIG. 16 is worn on the wrist.

18A and 18B are diagrams showing an example of a transfer function stored in a transfer function storage unit in the modified example as a graph of a coefficient and a phase for each harmonic.

FIG. 19 is an external view of an anoxic work threshold detection device according to a modification of the third embodiment.

FIG. 20 is an external view of an anoxic work threshold detection device according to another modification of the third embodiment.

FIG. 21 is a graph showing a typical blood pressure waveform in a peripheral artery.

[Explanation of symbols]

10, 10a, 70, 100 Anoxic work threshold detection device 24 Blood pressure waveform calculation unit 26 Transfer function storage unit 30 Blood pressure waveform index derivation unit 34 Storage unit 38 Anoxic work threshold derivation unit 46 Exercise intensity detection unit 47 Acceleration sensor 48 Exercise intensity calculation unit 60, 60a Pulse wave detection unit 72 Conversion unit 76 Blood pressure value storage unit 80 Blood pressure measurement unit 102 Blood pressure detection unit

Claims (14)

[Claims] 1. An exercise intensity detection unit that detects exercise intensity, a blood pressure detection unit that non-invasively detects blood pressure, and a blood pressure that derives an index of the blood pressure waveform from the blood pressure waveform detected by the blood pressure detection unit. A waveform index deriving unit, the exercise intensity over a given range of the exercise intensity,
A storage unit that stores the blood pressure waveform index in association with each other, using the data stored in the storage unit, an anaerobic work threshold derivation unit that derives an anaerobic work threshold represented as the exercise intensity, An anoxic work threshold detection device comprising: 2. An exercise intensity detection unit for detecting exercise intensity, a pulse wave detection unit for non-invasively detecting a peripheral pulse wave, a peripherally detected pulse wave waveform, and a pulse wave waveform Using a transfer function storage unit that stores a transfer function calculated in advance using a corresponding blood pressure waveform, the pulse wave waveform in the periphery newly detected by the pulse wave detection unit, and the transfer function, From a blood pressure waveform calculation unit that calculates a blood pressure waveform corresponding to the pulse wave waveform, and a blood pressure waveform calculated by the blood pressure waveform calculation unit,
A blood pressure waveform index deriving unit that derives an index of the blood pressure waveform, the exercise intensity over a given range of the exercise intensity, and
An anaerobic work threshold deriving unit that derives an anaerobic work threshold represented as a numerical value of the exercise intensity using a storage unit that stores the blood pressure waveform index in association with each other, and data stored in the storage unit. An anoxic work threshold detection device comprising: 3. An exercise intensity detection unit for detecting exercise intensity, a pulse wave detection unit for non-invasively detecting a peripheral pulse wave, and a blood pressure measurement in the vicinity of a region where the pulse wave detection unit detects a pulse wave. A blood pressure measuring unit, a blood pressure value measured by the blood pressure measuring unit, a conversion unit for converting the pulse wave waveform detected by the pulse wave detecting unit into a blood pressure waveform in the periphery; A blood pressure waveform index derivation unit that derives an index of the blood pressure waveform from the blood pressure waveform; a storage unit that stores the exercise intensity and the blood pressure waveform index in association with each other over a given range of the exercise intensity; An anoxic work threshold value deriving unit for deriving an anaerobic work threshold value represented as a numerical value of the exercise intensity, using the data stored in. 4. An exercise intensity detector for detecting exercise intensity, a pulse wave detector for non-invasively detecting a peripheral pulse wave, and a pulse wave detector for measuring a pulse wave in advance in the vicinity thereof. A blood pressure value storage unit that stores a blood pressure value, using the blood pressure value stored in the blood pressure value storage unit, a conversion unit that converts the pulse wave waveform detected by the pulse wave detection unit to the blood pressure waveform in the periphery, A blood pressure waveform index derivation unit that derives an index of the blood pressure waveform from the blood pressure waveform obtained by the conversion unit, and stores the exercise intensity and the blood pressure waveform index in association with each other over a given range of the exercise intensity. A storage unit, and using the data stored in the storage unit, an anaerobic work threshold derivation unit for deriving an anaerobic work threshold represented as a numerical value of the exercise intensity; Oxygen threshold test Apparatus. 5. The pulse wave detection unit according to claim 2, wherein the pulse wave detector changes the volume pulse wave that changes in accordance with a blood flow amount as a change in the amount of red blood cells in capillaries existing near the skin. An anoxic work threshold detection device, characterized in that it is configured to detect. 6. The transfer function storage unit according to claim 2, wherein the transfer function storage unit stores a plurality of transfer functions corresponding to different pulse rates, and the blood pressure waveform calculation unit includes the pulse wave detection unit. An anoxic work threshold detection device, wherein a blood pressure waveform is calculated by selecting a transfer function corresponding to a pulse rate derived from the pulse wave detected by the above from the plurality of transfer functions and using the selected transfer function. 7. The transfer function storage unit according to claim 2, wherein the transfer function storage unit stores a plurality of transfer functions corresponding to different ages, and the blood pressure waveform calculation unit includes the pulse wave detection unit. An anoxic work threshold value detecting device, wherein a blood pressure waveform is calculated by selecting a transfer function corresponding to the age of a subject who detects a pulse wave from the plurality of transfer functions and using the selected transfer function. 8. The transfer function storage unit according to claim 2, wherein the transfer function storage unit stores a plurality of transfer functions corresponding to different physiological ages, and the blood pressure waveform calculation unit includes the pulse wave. An anoxic work threshold value detection device characterized in that a blood pressure waveform is calculated by using a transfer function corresponding to a physiological age of a subject whose pulse wave is detected by selecting from the plurality of transfer functions. 9. The anoxic work threshold detecting device according to claim 1, wherein the index derived by the blood pressure waveform index deriving unit is diastolic blood pressure. 10. The anoxic work threshold detecting device according to claim 1, wherein the index derived by the blood pressure waveform index deriving unit is mean blood pressure. 11. The index according to any one of claims 1 to 8, wherein the index derived by the blood pressure waveform index deriving unit is a differential pressure between the presystolic blood pressure and the blood pressure at the notch. Anoxic work threshold detector. 12. The blood pressure waveform index deriving unit according to claim 1, wherein the index derived by the blood pressure waveform index deriving unit is a ratio of presystolic blood pressure to blood pressure at a notch. Oxygen threshold detection device. 13. The index according to any one of claims 1 to 8, wherein the index derived by the blood pressure waveform index deriving unit is a pulse pressure as a differential pressure between systolic blood pressure and diastolic blood pressure. Anoxic work threshold detector. 14. The anaerobic property according to claim 1, wherein the index derived by the blood pressure waveform index deriving unit is a ratio of the early systolic blood pressure and the late systolic blood pressure. Work threshold detection device.