JP2017153581A - Biological activity display device, biological activity display method, and walking test system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological activity display device and a biological activity display method capable of appropriately grasping relationships between exercise intensity, and an SpOand a pulse rate.SOLUTION: An SpOand a pulse rate are displayed together with the largest exercise intensity in a period from a first time point which is a measurement time point of the SpOand the pulse rate to a second time point prior to the first time point. Thereby, a current SpOvalue and the exercise intensity that has dominantly affected the value can be displayed simultaneously so that a medical worker or a user can correctly recognize cause-effect relationships between the SpOvalue and the exercise intensity.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a life activity display device, a life activity display method, and a gait test system that are used, for example, in a gait test for confirming the effect of respiratory rehabilitation.

  Tests for confirming the effect of respiratory rehabilitation include an in-hour walking test and a shuttle walking test.

The in-time walking test allows a subject to reciprocate as much as possible at a distance of, for example, 30 m for a certain period of time. Measures of breathing difficulty and lower limb fatigue), SpO ₂ (arterial oxygen saturation), and pulse rate.

In the shuttle walking test, the subject walks back and forth between cones placed at both ends of a 10 m course, for example. The subject walks according to the dial tone output from the speaker. The interval between the beep sounds is shortened every minute so that the walking speed increases, for example, by 10 m / min. At this time, the walking distance, Borg scale, SpO ₂ and pulse are measured. The shuttle walking test is stopped when the subject is unable to keep pace or when clinical symptoms such as dyspnea appear. Note that the cone interval, the walking speed change amount, and the change interval are not limited to this, and are appropriately changed.

A pulse oximeter is used for the effect confirmation test of such respiratory rehabilitation. The pulse oximeter is attached to a predetermined living body part of a subject, outputs light toward the living body part, and measures a change in the amount of light transmitted or reflected through the living body part as a pulse signal, so that SpO _{2 is used.} Ask for. The pulse oximeter is generally capable of measuring a pulse in addition to SpO ₂ (see, for example, Patent Document 1).

JP 2007-289462 A

Satoshi Kanazawa, Ichiro Kuwahira and 20 others, “Q & A Pulse Oximeter Handbook”, p. 6, [online], April 2014, Japanese Respiratory Society, [Search February 26, 2016], Internet <URL : Https://www.jrs.or.jp/uploads/uploads/files/guidelines/pulse-oximeter_medical.pdf>

By the way, in the conventional walking test, the number of steps, the walking distance, the walking speed, the Borg scale, the SpO ₂ and the pulse are related and displayed and recorded in time series.

However, it cannot be said that the display and recording with sufficient consideration of the exercise performed by the patient and the SpO ₂ and the pulse are made, and as a result, it is not possible to accurately grasp the relationship between the exercise and the SpO ₂ and the pulse. It was difficult.

The present invention has been made in consideration of the above points, and provides a life activity display device, a life activity display method, and a gait test system capable of accurately grasping the relationship between exercise, SpO ₂ and pulse rate. To do.

One aspect of the life activity display device of the present invention is:
An SpO ₂ acquisition unit for acquiring the subject's SpO ₂ ;
An exercise intensity acquisition unit for acquiring exercise intensity of the subject;
The SpO _2, and a display unit for displaying with maximum exercise intensity in the period from the first time point is a measurement point in their SpO ₂ to the second time point is also in the past than the first time point,
It comprises.

One aspect of the life activity display method of the present invention is:
Calculating the maximum exercise intensity in the period from the first time point of SpO ₂ measurement time to the second time point past the first time point,
The value of SpO ₂ at the time of measurement and the value of the maximum exercise intensity within the period are displayed on the same screen.

One aspect of the walking test system of the present invention is:
A pulse oximeter for measuring the SpO ₂ of the subject,
The measured SpO ₂ and the exercise intensity of the exercise performed by the subject are input, and the SpO ₂ is changed from the first time point at which the SpO ₂ is measured to the past time from the first time point. A terminal that displays with the maximum exercise intensity in the period up to time point 2,
It comprises.

According to the present invention, it is possible to accurately grasp the relationship between exercise, SpO ₂ and pulse rate.

Schematic which shows the whole structure of the walk test system to which the life activity display apparatus of this invention is applied. Block diagram showing the main configuration of the pulse oximeter The block diagram which shows the principal part constitution of the tablet terminal 4A and 4B are diagrams for explaining the principle of display of measurement results according to the embodiment, in which FIG. 4A is a diagram illustrating a change in SpO ₂ , and FIG. 4B is a diagram illustrating a change in exercise intensity (METs); 4C is a diagram showing a display example according to the embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Configuration>
FIG. 1 is a schematic diagram showing the overall configuration of a walking test system to which the life activity display device of the present invention is applied.

  The walking test system 1 includes a pulse oximeter 100 and a tablet terminal 200. The pulse oximeter 100 and the tablet terminal 200 have a function capable of wireless communication with each other. In the case of the present embodiment, the pulse oximeter 100 and the tablet terminal 200 are capable of short-range communication based on the Bluetooth (registered trademark) standard. The pulse oximeter 100 transmits measurement data to the tablet terminal 200 wirelessly. The tablet terminal 200 collects the measurement data received from the pulse oximeter 100, displays the measurement result, and creates a walking test report.

  The pulse oximeter 100 includes a main body part 110 and a probe part 120. The main body part 110 and the probe part 120 are connected via a cable 130. The main body 110 can be mounted near the wrist of the subject using a belt (not shown), and the probe unit 120 can be mounted on the finger of the subject.

  FIG. 2 is a block diagram showing a main configuration of the pulse oximeter 100. The probe unit 120 of the pulse oximeter 100 is provided with a light emitting unit 121 and a light receiving unit 122. The light-emitting unit 121 includes a first light-emitting diode that emits red light (for example, wavelength 660 [nm]) that is highly sensitive to changes in arterial oxygen saturation, and infrared light that is less affected by arterial oxygen saturation (for example, And a second light emitting diode that emits light at a wavelength of 940 [nm]). The light receiving unit 122 includes a photodiode, and detects the light of the light emitting unit 121 that has passed through the finger. Note that the light receiving unit 122 may be arranged not in the light transmission path from the finger but in the light reflection path from the finger, and the light reception unit 122 may detect the reflected light from the finger.

The main body 110 obtains the subject's SpO ₂ and pulse based on the detection light obtained by the probe unit 120. This will be specifically described. The light emitting circuit 111 causes the first light emitting diode and the second light emitting diode of the light emitting unit 121 to emit light alternately at a predetermined interval. The transmitted light or reflected light from the finger at that time is detected by the light receiving unit 122, subjected to photoelectric conversion, and input to the light receiving circuit 112. The light receiving circuit 112 converts the current signal input from the light receiving unit 122 of the probe unit 120 into a voltage signal. In addition, the light receiving circuit 112 demodulates the two observation signals by separating the converted voltage signal into the components corresponding to the wavelengths of the red light and the infrared light described above. In addition, the light receiving circuit 112 performs processing such as amplification and analog-digital conversion on the demodulated observation signal, and outputs the processed observation signal to the CPU 113.

The CPU 113 calculates SpO ₂ and the pulse from the observation signal by executing a predetermined program. Since this calculation method is a known technique as described in Patent Document 1, for example, description thereof is omitted here. The CPU 113 controls each part of the pulse oximeter 100. Specifically, the CPU 113 performs various settings based on operation signals input from the operation unit 117. The CPU 113 performs operation control of the light emitting circuit 111, display control of the display unit 115, communication control of the communication unit 116, and the like.

  In addition to such a configuration, an acceleration sensor 118 is provided in the main body 110 of the pulse oximeter 100. The CPU 113 calculates the number of steps of the subject based on the output of the acceleration sensor 118.

The pulse oximeter 100 transmits the measured SpO ₂ , pulse, and number of steps to the tablet terminal 200 in real time by the communication unit 116.

As illustrated in FIG. 3, the tablet terminal 200 includes a display unit 210 including a liquid crystal display with a touch panel and a communication unit 211 that wirelessly receives measurement data transmitted from the pulse oximeter 100. The communication unit 211 functions as an SpO ₂ acquisition unit that acquires the subject's SpO ₂ and a pulse acquisition unit that acquires the pulse of the subject. The tablet terminal 200 inputs the number of steps in the information received from the pulse oximeter 100 to the walking speed calculation unit 212.

The walking speed calculation unit 212 calculates the walking speed of the subject from the input number of steps and the stride. Specifically, the walking speed calculation unit 212 calculates the walking speed by the following equation.
Walking speed [m / min] = step length [m] × pitch [step / min] (1)

Here, the height and age of the subject are stored in advance together with the name of the subject by the user in the storage unit 214, and the walking speed calculation unit 212 determines the subject based on the height and age of the subject. The walking speed of the subject is calculated by calculating (1) using the stride and estimating (1). The stride is obtained by the following formula, for example.
Stride length = Height x 0.37 ……… (2)
The stride may be obtained using an expression other than the expression (2). In addition, considering that the stride tends to be shorter as it gets older, the stride may be corrected according to age.

The exercise intensity calculator 213 calculates exercise intensity using the walking speed obtained by the walking speed calculator 212. In the case of the present embodiment, the exercise intensity calculation unit 213 calculates exercise intensity (METs (Metabolic Equivalents)) by the following equation. Incidentally, equation (3) is a METs calculation formula proposed by the American Sports Medicine Association.
METs = (3.5 + walking speed × coefficient according to walking speed) /3.5 (3)

  It should be noted that the present invention is not limited to what formula is used to determine the exercise intensity, and the exercise intensity calculation unit 213 may calculate the exercise intensity using an expression other than the expression (3).

  The CPU 215 displays the measurement result on the display unit 210 and creates a report in accordance with an application program for performing a walking test stored in the storage unit 214.

  In the present embodiment, the number of steps is acquired by the acceleration sensor 118 of the pulse oximeter 100. For example, the tablet terminal 200 is provided with a mode for inputting the number of steps counted visually by a medical worker. May be obtained.

<Display of measurement results>
Next, display of measurement results according to the present embodiment will be described.

  In the case of the present embodiment, display of the measurement result of the walking test and creation of the walking test report are performed by the tablet terminal 200. That is, the tablet terminal 200 receives measurement data from the pulse oxystem meter 100, displays a measurement result on the display unit 210, and creates a report according to application software for performing a walking test.

FIG. 4 is a diagram for explaining the principle of display of measurement results according to the present embodiment. 4A shows how SpO ₂ changes, FIG. 4B shows how exercise intensity (METs) changes, and FIG. 4C shows a display example according to the present embodiment. 4A, 4B, and 4C are shown with the time axis aligned.

  The inventors of the present invention have reached the present invention by paying attention to the following two points.

As can be seen from the target point 1) FIGS. 4A and 4B, depending on site of measuring SpO _2, when the SpO ₂ measured at fingers, the influence of the motion appears in SpO _2, the movement Often 10 to 30 seconds after being performed. The cause of such a delay is described in Non-Patent Document 1, for example.

Point of interest 2) The value of SpO ₂ tends to be dominated by high intensity exercise.

Considering these, the present invention does not display the current SpO ₂ value and the current exercise intensity, but within a predetermined period from the current SpO ₂ value to a certain past time. The maximum value of exercise intensity is displayed. As a result, the current value of SpO ₂ and the exercise intensity that has a dominant influence on the value can be displayed at the same time, so that the medical worker or user can determine the causal relationship between the value of SpO ₂ and the exercise intensity. Can be recognized correctly.

  This will be specifically described with reference to FIG.

The SpO ₂ and pulse rate obtained at time t-0 are 85% and 80 bpm, respectively, and the exercise intensity is 1.5 METs. SpO ₂ and the pulse rate obtained at time t-1 10 seconds before are 90% and 90 bpm, respectively, and the exercise intensity is 1.5 METs. The SpO ₂ and the pulse rate obtained at time t-2 10 seconds before are 97% and 100 bpm, respectively, and the exercise intensity is 4.0 METs. SpO ₂ and the pulse rate obtained at time t-4 20 seconds before are 97% and 65 bpm, respectively, and the exercise intensity is 1.5 METs. Further, the SpO ₂ and pulse rate obtained 10 seconds after time t-0 are 97% and 65 bpm, respectively, and the exercise intensity is 1.5 METs.

  An example of a display image according to the present embodiment is shown in FIG. 4C. Images F1, F2, F3, F4, and F5 are sequentially displayed on the display unit 210 of the tablet terminal 200. The image F1 is displayed at time t-4, the image F2 is displayed at time t-2, the image F3 is displayed at time t-1, the image F4 is displayed at time t-0, and the image F5 is displayed at time t + 1. Is displayed.

In each of the images F1 to F5, the SpO ₂ and pulse rate values at the time of measurement and the maximum value of exercise intensity within a predetermined period from the measurement time to a certain past time are displayed. For example, in the display image F4 at the time point t-0, the maximum exercise intensity “4.0 METs” in the past 30 seconds is displayed together with the SpO ₂ and the pulse rate “85%, 80 bpm” at the time of measurement. Similarly, in the display image F3 at the time point t-1, the maximum exercise intensity “4.0 METs” in the past 30 seconds is displayed together with the SpO ₂ and the pulse rate “85%, 80 bpm” at the measurement time point.

Thus, in the display of the present embodiment, the display values of SpO ₂ and pulse rate are updated as needed, but the display values of exercise intensity are fixed at the maximum exercise intensity for the past 30 seconds.

As described above, according to this embodiment, the SpO ₂ and pulse rate, the SpO _2, and the first time point is a measurement point of the pulse rate corresponding than the first time the second time in the past By displaying together with the maximum exercise intensity within the period until, it is possible to display the current SpO ₂ value and the exercise intensity that has a dominant influence on the value at the same time, so The person or user can correctly recognize the causal relationship between the value of SpO ₂ and the exercise intensity when SpO ₂ decreases.

Note in the above embodiment, SpO ₂ and with pulse rate numbers it has dealt with the case of displaying the maximum exercise intensity within the past 30 seconds from the time of measuring the SpO ₂ and pulse rate, not limited thereto, maximum exercise intensity displayed along with SpO ₂ and pulse rate may be the maximum exercise intensity in the period over the past 10 seconds from the time of measurement of SpO ₂ and pulse rate are displayed.

The maximum exercise intensity within a past predetermined period from the time of measurement of SpO ₂ and pulse rate displays may be excluded. Thus, still SpO ₂ and the exercise intensity that does not affect the pulse rate can be prevented from being displayed with the SpO ₂ and pulse rate. For example, the image F2 at the time point t-2 in FIG. 4 displays “4.0 METs” as the maximum exercise intensity, but this SpO ₂ at the time point t- ₂ and the pulse rate “97%, 100 bpm” It is considered that the influence of the exercise with the maximum exercise intensity “4.0 METs” has not yet appeared. Therefore, by excluding the maximum exercise intensity in the most recent period that does not affect SpO ₂ and the pulse rate, the causal relationship between the value of SpO ₂ and the exercise intensity can be recognized more correctly.

  Moreover, although the case where the tablet terminal 200 functions as a life activity display device according to the present invention has been described in the above-described embodiment, the pulse oximeter 100 can also function as a life activity display device according to the present invention. That is, the walking speed calculation unit 212, the exercise intensity calculation unit 213, and the storage unit 214 may be provided in the pulse oximeter 100, and the display unit 115 of the pulse oximeter 100 may perform the same display as in the above-described embodiment. .

  Moreover, although the case where this invention was applied to the walking test system 1 was described in the above-mentioned embodiment, this invention is not restricted to this, For example, you may apply to a portable type activity meter.

Further, in the above-described embodiment, the case where SpO ₂ and the pulse rate are displayed together with the maximum exercise intensity is described. However, even when SpO ₂ is displayed together with the maximum exercise intensity without displaying the pulse rate. The same effects as those of the above-described embodiment can be obtained.

  The above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. That is, the present invention can be implemented in various forms without departing from the gist or main features thereof.

  The present invention can be applied to a walking test system, for example.

1 walking test system 100 pulse oximeter 110 main body 111 light emitting circuit 112 light receiving circuit 113, 215 CPU
114, 214 Storage unit 115, 210 Display unit 116, 211 Communication unit 117 Operation unit 118 Acceleration sensor 120 Probe unit 121 Light emission unit 122 Light reception unit 130 Cable 200 Tablet terminal 211 Communication unit 212 Walking speed calculation unit 213 Exercise intensity calculation unit

Claims (7)

An SpO ₂ acquisition unit for acquiring the subject's SpO ₂ ;
An exercise intensity acquisition unit for acquiring exercise intensity of the subject;
The SpO _2, and a display unit for displaying with maximum exercise intensity in the period from the first time point is a measurement point in their SpO ₂ to the second time point is also in the past than the first time point,
A life activity display device comprising: The display unit
Displaying the value of SpO ₂ at the time of measurement and the value of the maximum exercise intensity within the period on the same screen;
The life activity display device according to claim 1. The second time point is a time point that is 10 seconds or more past the first time point,
The life activity display device according to claim 1 or 2. The exercise intensity is determined using the number of steps per unit time of the subject.
The life activity display device according to any one of claims 1 to 3. Displaying the pulse rate along with the maximum exercise intensity and SpO ₂ ;
The life activity display device according to any one of claims 1 to 4. Calculating the maximum exercise intensity in the period from the first time point of SpO ₂ measurement time to the second time point past the first time point,
Displaying the value of SpO ₂ at the time of measurement and the value of the maximum exercise intensity within the period on the same screen;
Life activity display method. A pulse oximeter for measuring the subject's SpO ₂ ;
The measured SpO ₂ and the exercise intensity of the exercise performed by the subject are input, and the SpO ₂ is changed from the first time point at which the SpO ₂ is measured to the past time from the first time point. A terminal that displays with the maximum exercise intensity in the period up to time point 2,
A walking test system comprising:

Images