JP2014166559A - Biological information measurement device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological information measurement device for generating and displaying information for leveling loads of a plurality of members in mountain-climbing or the like.SOLUTION: A biological information measurement device comprises: a pulse wave measurement unit 10 for measuring a pulse wave of a user; a storage unit 23 for storing body information; a heart rate calculation unit 41 for calculating a heart rate HRa based on a pulse wave signal; a regression formula generation unit 42 for generating regression formula information showing relation between a relative heart rate %HR and a relative oxygen intake %VOon the basis of the body information; a relative oxygen intake calculation unit 43 for calculating a relative oxygen intake %VOof the user on the basis of the regression formula information and calculated heart rate HRa; a target value calculation unit 44 which acquires another user's relative oxygen intake %VOb, calculates a target relative oxygen intake %VOby averaging the relative oxygen intake of the user and the acquired relative oxygen intake, and calculates difference Δ%VObetween the target relative oxygen intake and the relative oxygen intake of the user; and a display unit 4 for displaying the difference.

Description

  The present invention relates to a biological information measuring device, and more particularly to a biological information measuring device capable of estimating the oxygen intake by measuring a heart rate.

  From the viewpoint of health and preventive medicine, it is important that the balance between the calories consumed by humans and taken into the body and the calories consumed in daily life is balanced. However, in modern society, calorie consumption tends to decrease due to the development of transportation facilities. On the other hand, the calorie intake by food tends to increase, and the balance between the calorie intake and the calorie consumption has collapsed. Therefore, it is important to exercise actively, increase calorie consumption, and manage the relationship between calorie intake and calorie consumption. Therefore, Patent Document 1 below describes a portable device that allows a general user to easily perform health care. According to this apparatus, the heart rate of the user can be constantly measured, and the oxygen intake can be estimated based on the heart rate and the physical information (height, weight, age, sex, etc.) of the user. It is like that. The oxygen intake is the consumption (volume) of oxygen per unit time and unit weight, and the calorie consumption is proportional to the product of the user's body weight and oxygen intake.

  By the way, it describes in the following nonpatent literature 1 for the purpose of improving the social interest with respect to the above health management, and preventing the lifestyle-related disease resulting from the metabolic syndrome etc. which are regarded as a problem in recent years. In 2006, the Ministry of Health, Labor and Welfare formulated a unit called “Met” that represents exercise intensity and “Exercise” that represents the amount of exercise by multiplying that “Met” by time as an indicator of calorie consumption. The correspondence between the type of exercise and exercise intensity (Mets) was defined. The ideal amount of exercise is 23 exercises per week.

  However, this proper exercise amount of 23 exercises proved difficult to achieve. For example, fast walking (walking) and cycling are 4 Mets exercise intensity, even if walking 30 minutes every day and doing 4 exercises every day, the amount of exercise per week is 14 exercises, 23 exercises are not far away. Of course, if you exercise longer or exercise more intensely, 23 exercises can be achieved, but you can exercise more intensely on weekdays when you are busy and tend to accumulate fatigue. It is not realistic to exercise for a long time.

  On the other hand, with the increase in holidays and nature-oriented people, more people enjoy hiking and climbing on holidays. The exercise intensity of hiking is said to be 6 mets, and if you hike for 4 hours per week, you can achieve one week of exercise. Therefore, hiking and mountain climbing can be said to be an effective health management method for those who have few exercise opportunities on weekdays.

JP 2009-61246 A

Impress Watch, Inc., “Basic Terms of Modern Home Appliances 36th: What is“ Mets / Exercise ”for Measuring Momentum”, [online], [Search March 5, 2010], Internet <URL: http: // kaden.watch.impress.co.jp/cda/word/2009/02/13/3522.html>

  As described above, hiking and mountain climbing on holidays are effective as a method for resolving lack of exercise in daily life. By the way, hiking and mountain climbing are usually performed in a party with a plurality of people. Therefore, it is assumed that a plurality of members making up the party walk the same journey at the same speed. However, each member in the party has different physical strength, experience, physical condition, weight of equipment to carry, etc., and even in the same process, people who feel great fatigue, those who feel unsatisfactory, etc. There is a difference in degree. Therefore, when hiking or climbing, there may be an imbalance in the health status among members. This eliminates the significance of hiking and climbing in a party.

  Therefore, the present invention provides a biological information measuring device that generates and displays information that serves as an index for allowing members of a party to feel the same load during hiking and mountain climbing from a heart rate. The purpose is that. Other purposes will be clarified below.

A main invention for achieving the above object is a biological information measuring device that is worn on a user's body, measures the biological information of the user, and estimates an oxygen intake amount.
A pulse wave measurement unit for measuring a pulse wave signal including a signal component corresponding to a user's pulsation;
A storage unit for storing physical information related to the physical characteristics of the user;
A heart rate calculator for calculating a heart rate based on the pulse wave signal;
A regression equation generating unit that generates regression equation information indicating the relationship between the relative heart rate and the relative oxygen intake based on the physical information;
A relative oxygen intake calculation unit that calculates a relative oxygen intake% VO ₂ a of the self corresponding to the heart rate HRa based on the regression equation information and the heart rate HRa calculated by the heart rate calculation unit;
The other person's relative oxygen intake% VO ₂ b is obtained, the average value% VO ₂ ta of the self relative oxygen intake% VO ₂ a is calculated as the target relative oxygen intake, and the target relative oxygen A target value calculation unit for calculating a difference Δ% VO ₂ a between the intake amount VO ₂ ta and the relative oxygen intake amount VO ₂ a of the self;
And a target value display unit for displaying the difference Δ% VO ₂ a on a display attached thereto.

It is an external view when the biological information measuring device concerning the embodiment of the present invention is seen from the front. They are the external view (A) when the said biological information measuring device is seen from the back, and the external view (B) when it sees from the side. It is a structural diagram of a pulse wave sensor provided in the biological information measuring device. It is a functional block diagram of the said biological information measuring device. It is explanatory drawing about the regression type information which is the relationship between a relative heart rate and a relative oxygen intake. It is a figure which shows the regression type information of two people of A and B who walk on the same process. It is a figure which shows the flow of the information processing in the said biometric apparatus. It is a figure which shows the estimation principle of the relative oxygen uptake which A and B should aim at.

=== Characteristics of Embodiments of the Invention ===
In a party hike or climb (hereinafter referred to as “trekking” for convenience), if you can provide some information to make all the party members feel at the same level, maintain a healthy health condition among the members. I thought it could be improved. In addition, we thought that it was possible to prevent the climbers who had no physical strength from leaving the party, and to reduce the risk of injuries caused by excessive climbing due to insufficient physical strength.
However, in trekking at a party, all members walk at the same distance at the same walking speed for the same time, and the exercise intensity cannot be changed by each member.

  Here, if the exercise intensity is almost the same between members, the oxygen intake expressed by the volume per unit time and unit weight is almost the same, and the energy consumption by multiplying the oxygen intake by the weight We paid attention to the difference in the load between the members. He then redistributed the initial weight (equipment weight) of the baggage he was carrying and thought to make the load felt by each member the same. Of course, when the weight is redistributed, it is necessary to make the sensed load an objective numerical value and to convert the difference in load into the difference in equipment weight. The present invention was created to meet such a demand, and the embodiment of the present invention has the following features in addition to the features in the embodiments corresponding to the main invention.

The storage unit stores a weight wa of equipment carried by the user,
Based on the heart rate HRa and the regression information, the oxygen intake VO ₂ a is calculated, and the target oxygen intake VO ₂ is calculated based on the target relative oxygen intake% VO ₂ ta and the regression information. ₂ an oxygen intake estimation unit for calculating ₂ ta;
Based on the difference Δ% VO ₂ a calculated by the target value calculation unit, the oxygen intake VO ₂ a, the target oxygen intake VO ₂ ta, the physical information, and the weight wa of the equipment. A weight distribution calculation unit for calculating a weight Δwa that should be increased or decreased with respect to the equipment weight,
The target value display unit displays the weight Δwa to be increased or decreased on the display.

The storage unit stores physical information of other persons other than the user and weight wb of equipment,
The regression equation information generation unit generates the regression equation information of the other person based on the physical information of the other person,
The relative oxygen intake calculation unit inputs the heart rate HRb of the other person and corresponds to the heart rate HRb of the other person based on the heart rate HRb of the other person and the regression equation information of the other person. Calculate the relative oxygen uptake% VO ₂ b of others
The target value calculation unit calculates a difference Δ% VO ₂ b between the target relative oxygen intake% VO ₂ ta and the relative oxygen intake% VO ₂ b of the other person,
Based on the difference Δ% VO ₂ b calculated by the target value calculation unit, the physical information of the other person, and the weight wb of the other person's equipment, the weight distribution calculation unit A weight Δwb to be increased / decreased by another person and an average value Δw _ave of an absolute value of the weight Δw to be increased / decreased for each of the user and the other person,
The target value display unit displays at least one of the weight Δwb and the average value Δw _{ave of the} other person to be increased or decreased on the display.

A body motion signal measuring unit that measures a body motion signal associated with body motion of the human body, and a rest detection unit that determines whether the user is in a rest state based on the body motion signal;
The target value calculation unit adopts the heart rate HRa immediately before the start of the break when calculating the difference Δ% VO ₂ a when the break detection unit determines that the user is in a break. To do.

A communication unit that communicates with other biological information measurement devices by radio signals,
The storage unit receives the communication unit and the physical information of the other person other than the user and the weight of the other person's equipment, stores the communication unit in the storage unit,
The relative oxygen intake calculation unit inputs the heart rate of the other person via the liaison unit.

=== Embodiment of the Invention ===
As a specific embodiment of the present invention, a wristwatch-type biological information measuring device (hereinafter, measuring device) is given. This measuring device is, for example, installed at a trekking party by members who can share luggage, and the pulse wave of the person wearing the baggage (hereinafter referred to as the user or the wearer) is detected using an electrical signal. (Pulse wave signal) is converted into a pulse wave signal, and the physical information of the wearer is received by user input, and the load during trekking is estimated based on the analysis result of the pulse wave signal and the physical information. Finally, it is equipped with a weight distribution function that presents the excess or deficiency of equipment weight when redistributing luggage among party members.

<Structure>
FIG. 1 shows an external view of the measuring apparatus 1. This measuring device 1 has an appearance similar to that of a general digital wristwatch, and includes a wristband 2 for wearing on a wrist of a person. A time, an operating state of the device, and various living bodies are provided on the front surface of a case 3. A liquid crystal display (LCD) 4 for displaying information (pulse rate, calorie consumption, etc.) by letters, numbers, or icons is arranged. Various buttons 5 for operating the measuring device are disposed around the case 3 and on the frame portion on the front surface of the case 3. In addition, this measuring device operates using a built-in secondary battery as a power source, and a charging terminal 6 for charging the built-in secondary battery connected to an external charger is disposed on the side of the case 3. ing.

  FIG. 2A shows an external view of the measuring device 1 when viewed from the rear surface, that is, the back surface of the case 3. Further, FIG. 2B shows a side view of the measuring apparatus 1 mounted on the user's arm 100. A pulse wave sensor 10 for detecting a user's pulse wave and outputting a pulse wave signal is disposed on the back surface of the case 3. The pulse wave sensor 10 detects a pulse wave at the user's wrist 100 that is in contact with the back surface of the case 3. In the present embodiment, a configuration for optically detecting a pulse wave is provided.

  FIG. 3 is an enlarged view when the internal structure of the pulse wave sensor 10 is viewed from the side surface of the case 3. A light source 12 such as an LED and a light receiving element 13 such as a phototransistor are incorporated in a hemispherical storage space having a circular bottom surface on the back side of the case 3. The inner surface of the hemisphere is a mirror surface 11, and the light receiving element 13 and the light source 12 are respectively mounted on the upper surface and the lower surface of the substrate 14 when the bottom surface side of the hemisphere is downward.

  When the light source 12 emits light Le toward the skin 101 of the user's wrist 100, the irradiated light Le is reflected by the subcutaneous blood vessel 102 and returns to the hemisphere as reflected light Lr. The reflected light Lr is further reflected by the hemispherical mirror surface 11 and enters the light receiving element 13 from above.

  The intensity of the reflected light Lr from the blood vessel 102 changes due to the light absorption action of hemoglobin in the blood, reflecting the change in blood flow. The pulse wave sensor 10 causes the light source 12 to blink at a predetermined cycle earlier than the pulsation, and the light receiving element 13 outputs a pulse wave signal corresponding to the received light intensity by photoelectric conversion for every lighting opportunity of the light source 12. In the present embodiment, the light source 12 is blinked at a frequency of 128 Hz.

<Functional block configuration>
FIG. 4 shows a functional block configuration of the measuring apparatus 1. The hardware configuration of the measuring device 1 is a computer having a function related to timekeeping such as time and a timer and a function of measuring biological information such as pulsation, body movement, and body temperature. The measuring apparatus 1 includes a computer body including a CPU 20, a RAM 21, and a ROM 22 as a control unit, and includes a flash memory 23 as an external storage. An oscillation circuit 24 for generating a reference clock for operating the CPU 20 and a frequency dividing circuit 25 for generating a clock for clocking from the reference clock are provided.

  As a configuration related to the user interface, a display unit 26 for displaying information on the LCD 4 according to an instruction from the CPU 20, an alarm unit 28 for outputting an alarm sound or vibration using a piezoelectric vibrator 27, and the operation buttons 5 are provided. An input unit 29 for generating operation data describing the operation state and inputting it to the CPU 20 is provided.

  Moreover, the measuring apparatus 1 is provided with various sensors (10, 31) as a structure for measuring biological information. As described above, the pulse wave sensor 10 is mainly composed of a light source 12 such as an LED and a light receiving element 13. The body motion sensor 31 is a three-axis acceleration sensor, and outputs three systems of body motion signals according to the respective accelerations in the three-axis directions. For example, as shown in FIG. 1, the normal direction of the front surface of the case 3 (from the back to the front of the paper) is the Z axis, and the direction from 6 o'clock to 12 is the Y axis. The direction orthogonal to the two axes can be the X axis. In this case, the X axis substantially coincides with the direction from the elbow to the wrist with the measuring device 1 attached.

  The pulse wave signal amplifying circuit 32 and the body motion signal amplifying circuit 33 for amplifying the pulse wave signal from the pulse wave sensor 10 and the body motion signal from the body motion sensor 31, respectively, and the amplifier circuits (32, 33). An A / D conversion circuit 34 for individually sampling and digitizing the pulse wave signal and the body motion signal amplified through the predetermined sampling period and converting them into pulse wave data and body motion data is provided. ing. In this embodiment, each signal is A / D converted at a sampling frequency of 16 Hz.

  The pulse waveform shaping circuit 35 and the body motion waveform shaping circuit 36 respectively use the pulse wave signal and the body motion signal amplified through the pulse wave signal amplification circuit 32 and the body motion signal amplification circuit 33 as a predetermined threshold value. Based on the comparison, binarization is performed. The CPU 20 detects the presence or absence of a pulse wave or body movement based on the input signals from these waveform shaping circuits (35, 36).

  Note that the heart rate measuring unit 41, the regression equation generating unit 42, the relative oxygen intake calculating unit 43, the target value calculating unit 44, the oxygen intake estimating unit 45, and the load distribution calculating unit 46 are stored in the ROM 22 or the like of the CPU 20. This is a functional block configuration realized by executing a program, and does not exist as individual hardware in this embodiment. Of course, these configurations (41 to 46) can be replaced with a DSP or the like.

  The communication unit 50 performs information processing related to data communication between an external information processing apparatus such as a personal computer and the CPU 20. The CPU 20 transfers various data to the information processing apparatus via the communication unit 50 and receives various data from the information processing apparatus. Note that the communication unit 50 and the external information processing apparatus may be directly connected via a cable conforming to a predetermined communication standard, or may be connected via an intermediate device that is also used as a charger called a cradle. There may be a form. A form in which communication is performed using a radio signal is also conceivable. In the case of cable connection, a connector for connecting to the cable may be provided on the outer surface of the case 3. In the case of wireless communication, it is only necessary that the information processing apparatus has an interface for wireless communication.

  In the present embodiment, the communication unit 50 employs a form that communicates with the information processing apparatus via a cradle. The communication unit 50 and the cradle communicate with each other by a radio signal, and the cradle and the information processing apparatus are configured to communicate with each other through a wired connection. As a result, the information processing apparatus does not require a special wireless communication interface, and the measuring apparatus 1 does not require a connector.

  Specifically, the cradle has a shape that allows the measuring device 1 to be detachably mounted, and a configuration for communicating with the communication device 50 of the measuring device 1 by a wireless signal with the measuring device in the mounted state, and an information processing device And a configuration for communicating with a protocol in accordance with a general-purpose communication standard such as USB, and interprets and mutually converts signals having different protocols transmitted and received in communication between both the measuring apparatus 1 and the information processing apparatus. Thereby, the CPU 20 can perform data communication with the information processing apparatus via the communication unit 50.

  With the above-described configuration of the measuring apparatus 1, the CPU 20 executes a predetermined program stored in the ROM 22 in accordance with operation data from the input unit 29, and the execution result, data from the A / D conversion circuit 34, etc. Is written into the RAM 21 and the written data is read out from the RAM 21. Further, the display unit 26 is controlled to display the execution result of information processing, the operation state of the measuring apparatus 1 or the time on the LCD 4, and the alarm unit 28 is controlled to output a signal by voice or vibration.

=== Basic functions of measuring device ===
The main function of the measurement apparatus 1 according to the present embodiment having the above-described configuration is to constantly measure the heart rate based on the pulse wave signal from the pulse wave sensor 10 and estimate the oxygen intake based on the measurement result. There is to do. Then, based on the estimated oxygen intake, information serving as an index for distributing the weight of the luggage so as to match the physical strength difference between the party members during trekking is calculated. Below, the operation | movement and the content of information processing are first demonstrated about the measurement function of the heart rate which is the basic function of the measuring apparatus 1, and the estimation function of oxygen uptake.

<Measurement of heart rate>
When the wearer of the measuring apparatus 1 has body movement such as walking, the pulse wave signal output from the pulse wave sensor 10 reflects fluctuations in blood flow disturbed by the influence of body movement. Therefore, the CPU 20 uses the heart rate measuring unit 41 to remove noise components correlated with body movements from the pulse wave data and extract only the pulsation signal, and also based on the frequency (or period) of the pulsation signal. Calculate Specifically, a digital filter constituted by an FIR filter or the like is generated as an applied filter, and a pulsation signal is extracted from a pulse wave signal including noise using the applied filter. Then, the frequency (or period) of the beat is specified by performing FFT analysis on the extracted beat signal data, and the beat per minute, that is, the heart rate is calculated based on the specified frequency or period. .

  When body movement is extremely small, such as at rest, the waveform of the pulse wave signal shows a peak corresponding to the heartbeat almost accurately. In such a case, the peak appearance interval becomes the pulsation cycle, and the heart rate can be measured without performing the above filtering process or FFT analysis. In other words, when trekking is performed, if it is assumed that the measuring apparatus 1 estimates the oxygen intake based on the heart rate while walking is stopped, the configuration and information processing related to body motion data processing are not necessary.

<Estimation of oxygen intake>
FIG. 5 is a diagram illustrating an example of the principle of estimating the oxygen intake. The flash memory 23 or the like stores data (regression formula information) that describes the correspondence (regression formula) between the heart rate HR and the oxygen intake VO ₂ . In the measuring apparatus 1 according to the present embodiment, as shown in FIG. 5, the heart rate HR and the oxygen intake VO ₂ are handled as numerical values of a relative heart rate% HR and a relative oxygen intake% VO ₂ , respectively. . The relative heart rate% HR, which is the horizontal axis 111 of the graph 110 shown in FIG. 5, is the actual heart rate HR when the resting heart rate HR _rest is 0% and the maximum heart rate HRmax is 100%. It is a ratio and is calculated | required by the following formula | equation (2).
_{% HR = (HR-HR rest} ) / (HR max -HR rest) × 100 [%] ... (1)

On the other hand, the relative oxygen intake% VO _{2 on} the vertical axis 112 of the graph 110 is defined such that the resting oxygen intake VO _2rest of the _user is 0% and the maximum oxygen intake VO _2max of the same user is 100%. It is the ratio of the actual oxygen intake VO ₂ with respect to time, and is obtained by the following equation (2).
% VO ₂ = (VO ₂ −VO _2rest ) / (VO _2max −VO _2rest ) × 100 [%] (2)

In the above formulas (1) and (2), the resting heart rate HR _rest , the maximum heart rate HR _max , the resting oxygen uptake VO _2rest , and the maximum oxygen uptake VO _2max are ACSM (American College of Sports Medicine). ) Can be obtained from physical information (height T, weight W, age Age, sex) indicating the physical characteristics of the user. Specifically, ACSM recommends that HR _{max be} a value obtained by subtracting age Age from 220, and that the correspondence shown in Table 1 below be adopted for HR _rest and VO _2max .

VO _2rest is calculated according to the well-known Harris-Benedict equation.
About the said equation, the thing for men (M) was shown in the following formula | equation (3), and the thing for women (F) was shown in the following formula | equation (4).
VO _2rest (M) = 66.47 + (13.75 × W)
+ (5.0 × T) − (6.76 × Age) (3)
VO _2rest (F) = 66.51 + (9.56 × W)
+ (1.85 × T) − (4.68 × Age) (4)

The table shown in Table 1 is stored in the ROM 22 or the like. Physical information is acquired by user input. The user operates the measuring apparatus 1 and inputs height T (m), weight W (Kg), age Age, and sex as his / her physical information. The equipment weight w (Kg) is also input. The CPU 20 receives physical information and equipment weight information from the input unit 29 and stores them in an appropriate storage area such as the flash memory 23. And _CPU20 specifies HR _rest and _VO2max based on the input physical information and the table shown in the said Table 1 by the regression equation production _| generation part 42, and _{produces |} generates regression equation information.

  The age Age may be calculated from the date of birth input by the user, and may be automatically updated every year by a calendar function that is a basic function related to timekeeping by the CPU 20. Moreover, as an input method of physical information, an external information processing apparatus connected to be communicable via the communication unit 50 can also be used. In this case, a program for accepting user input of physical information and transferring the physical information to the measuring device 1 may be installed in the information processing apparatus.

From the above, the relative heart rate% HR, the regression equation is represented by the relative oxygen uptake% VO _2, as a straight line (regression line) 130 shown in FIG. 5,% HR =% and relationship VO ₂ Become. CPU20 is the relative oxygen intake quantity calculator 43 calculates the relative heart rate% HR = relative oxygen uptake% VO ₂ measured heart rate HR are substituted into equation (1), oxygen uptake quantity estimating section 45 is the By substituting the relative oxygen intake% VO ₂ into the formula (2), the oxygen intake VO ₂ is calculated.

=== Embodiment of the Invention ===
The measuring device 1 is used while being worn on the arm of each member of the party during trekking. Each member operates his / her own measuring device 1 to calculate his / her relative oxygen intake during trekking, and his own device. Based on the relative oxygen intake and the relative oxygen intake of other members, the relative oxygen intake (target relative oxygen intake) that should be targeted is presented. Finally, based on the target relative oxygen intake, physical information, and equipment weight, a weight distribution standard is calculated and displayed. The measuring device 1 according to the embodiment of the present invention is characterized by a weight distribution function that displays a guide for weight distribution and information that serves as an index for the guide. In the following, as an example of the present invention, the weight distribution is described. Here are some examples of specific information processing and operations related to functions.

=== First Embodiment ===
As a first embodiment of the present invention, information processing for obtaining a target relative oxygen intake, which is the most important information for calculating a guideline for redistributing weight, from other relative oxygen intakes The operation is shown. Here, specifically, assuming two members A and B, the target relative oxygen intake for the member A is estimated by the measuring device 1 worn by the member A, and the member A is further estimated from the target relative oxygen intake. Here is an example of calculating the excess and deficiency of equipment weight.

Table 2 shows the parameters (HR _rest , HR _max , VO 2 _rest , VO 2 _max ) calculated from the physical information, equipment weight, and physical information of members A and B.
Moreover, the graph (110a, 110b) which shows the regression type information corresponding to each of the members A and B derived | led-out from Table 2 to FIG. 6 (A) (B) was shown. In addition, in Table 2 and the following description, in order to distinguish physical information and parameters from those of member “A” and those of member “B”, symbols and signs indicating physical information and equipment weight ( T, W, w, etc.), and the symbol and sign (% HR _rest indicating the _{parameter,% HR max,% VO2 rest} ,% VO2 max, HR rest, HR max, VO2 rest, "a" after the VO2 _max) or “B” is appended.

  The measuring devices 1 of the members A and B measure the heart rate HR during the trekking process by the respective heart rate measuring units 41. When walking is started, the heart rate gradually increases, and in trekking or the like in which a rapid change in the walking speed is small, the heart rate changes within a certain value as the walking time elapses. Of course, between members, the heart rate HR and the relative heart rate% HR differ according to the physical strength difference of each person.

<Calculation of target relative oxygen intake>
FIG. 7 shows the flow of information processing by the CPU 20 in the first embodiment. The CPU 20 in the measurement apparatus 1 of the member A calculates a heart rate by measuring the pulse wave signal by the heart rate measuring unit 41, and stores the temporal change of the heart rate in the flash memory 23 or the like (s1, s2). Then, for example, comparing the current heart rate with one minute ago and detecting that the difference has continued for a predetermined time within a predetermined numerical range, the average heart rate (hereinafter, Heart rate) HRa is calculated from time to time (s3 → s4).

First, at an appropriate time such as when the party arrives at a break point, the member A performs a predetermined operation for causing the measuring apparatus 1 to estimate the relative oxygen intake% VO ₂ a. The CPU 20 calculates the relative heart rate (hereinafter referred to as relative heart rate)% HRa by substituting the latest heart rate HRa calculated before the operation time into the equation (1) by the relative oxygen intake calculation unit 43, A point on the regression line 130a shown in FIG. 6A is specified (s5 → s6). Specifically, Table 3 below shows numerical values related to the oxygen intake calculated by the measuring devices 1 of the members A and B, respectively. Table 3 also includes differential energy that serves as an index for redistributing equipment weight, which will be described later, and excess / shortage of equipment weight calculated based on the differential energy.

As shown in Table 3, for example, if the average HRa of member A is 131 (bpm: beats / min),% HRa = 54% =% VO ₂ a is calculated by the above equation (1). . Then, the CPU 20 controls the display unit 26 to display the calculated value% HRa (=% VO ₂ a) on the LCD 4 (s7).

Similarly, the member B operates the measuring apparatus 1 to calculate the relative heart rate% HRb of the member B. Here, the heart rate HRb of member B is 135 (bpm), calculated as% HRb = 64%, and this value is the relative oxygen intake% VO ₂ b of member B, and this relative oxygen intake% VO ₂ b is displayed and output by the measuring device 1 of the member B.

Next, the member A performs a predetermined operation and inputs the value “64” of the relative oxygen intake% VO ₂ b displayed on the measuring device 1 of the member B to the measuring device 1 of itself. The CPU 20 uses the target value calculation unit 44 to calculate the average value% VO ₂ of the relative oxygen intake% VO ₂ a = 54% of the member A and the input relative oxygen intake% VO ₂ b = 64% of the member B. Calculate t = 59% (s8 → s9).

This value% VO ₂ t = 59% is an average value of relative oxygen intake of members A and B, in other words, this is an average value of the load caused by trekking of members A and B, and this value% VO ₂ t = 59% is the target relative oxygen intake% VO ₂ t for both members A and B to maintain and improve their health condition evenly by trekking.

When the relative oxygen intake% VO ₂ b = 64% for the member B is input, the CPU 20 displays and outputs the calculated target relative oxygen intake% VO ₂ t (s10). Since member A's relative oxygen intake% VO ₂ a = 54% previously calculated is smaller than target relative oxygen intake% VO ₂ t = 59%, member A has a part of the equipment weight of member B You can recognize that you should pay.

FIG. 8 shows the estimation principle of the target relative oxygen intake by a graph 130c of regression information. For each of members A and B, the midpoint Pt of two points (Pa, Pb) on the regression line corresponding to the relative oxygen intake (% VO ₂ a,% VO ₂ b) is the target relative oxygen intake% VO ₂ corresponds to t.

<Calculation of excess and shortage of equipment weight>
In the information processing (s1 to s10) described above, the member A can be made aware that a part of the equipment weight of the member B should be borne. Next, information processing for calculating how much weight should be borne in the measuring apparatus 1 will be described. Schematically, the target relative oxygen intake% VO ₂ t = 59% of the members A and B obtained previously is used as the absolute value of the oxygen intake (target oxygen intake) VO ₂ ta (mL / Kg / min) (s11), and the excess or deficiency of the equipment weight from the energy consumption ΔE (mL / min) corresponding to the difference between the target oxygen intake VO ₂ ta and the actual oxygen intake VO ₂ a Is calculated and displayed (s13 to s15).

First, in the measurement apparatus 1 of the member A, the CPU 20 causes the oxygen intake estimation unit 45 to calculate the relative oxygen intake (estimated relative oxygen intake)% obtained from the measured heart rate HRa = 131 (bpm) of the member A. Substituting VO ₂ a = 54% into the above equation (2), the absolute value VO ₂ a = 27.9 (mL / Kg / min) of the oxygen intake shown in Table 3 is obtained. Similarly, the target oxygen intake amount VO ₂ at = 30.26 (mL / Kg / min) of the member A is obtained from the target relative oxygen intake amount% VO ₂ t = 59%.

The energy corresponding to the difference ΔVO ₂ a = 2.36 between the target oxygen intake VO ₂ at and the oxygen intake VO ₂ a based on the heart rate HRa is the energy amount (difference energy) ΔE of the excess and deficiency for the member A It is. Since the unit of the differential energy ΔE is mL / min and the unit of the oxygen intake VO ₂ is mL / Kg / min, the differential energy ΔEa can be obtained by the following equation (5).
ΔEa = ΔVO ₂ at × (Wa + wa) (5)

And it calculates with difference energy (DELTA) Ea = 177.03mL / min. Finally, the excess / deficiency Δwa of the equipment weight is calculated by the following equation (6) so that the weight corresponding to the difference energy, that is, the final unit is Kg.
Δwa = ΔE / V0 ₂ t (6)

Thus, the equipment weight that is finally lacking in member A is calculated to be about 5.85 kg. If this Δwa is displayed on the LCD 4, the weight Δwa corresponding to the difference between the target oxygen intake V0 ₂ t of the member A and the oxygen intake V0 ₂ a estimated from the actual heart rate HRa can be obtained. A may have the member B distribute the baggage corresponding to this Δwa.

<Application example>
In the first embodiment, the excess / deficiency Δwa of the equipment weight wa in the member A is calculated, but the body weight (Wa, Wb) is different between the members A and B, and the initial equipment weight (wa, wb) is also different. There are many cases. Therefore, the excess / deficiency Δwb of the equipment weight wb of the member B in the measurement apparatus 1 of the member B and the excess / deficiency ΔWa of the member A calculated in the first embodiment do not necessarily cancel each other. That is, ΔWa + Δwb = 0 is not always satisfied.

As shown in Table 3, there is almost no difference in the oxygen intake (V0 ₂ a, V0 ₂ b) of the two people in the same process, but relative oxygen intake (% V0 ₂ a,%) due to differences in physical information A difference arises in V0 ₂ b). The difference is the difference between the target oxygen intake% V0 ₂ at and% V0 ₂ bt of the two members A and B. Furthermore, since there is a difference in energy consumption due to the difference in total weight (Wa + wa, Wb + wb), the absolute value of the excess or deficiency (Δwa, Δwb) of the equipment weight calculated in both measuring devices 1 is eventually different. It becomes a numerical value.

Of course, also in the first embodiment, the excess and deficiency (Δwa, Δwb) of the weight calculated by the measuring devices 1 of both the members A and B are confirmed with each other, and the absolute value of both excess and deficiency is obtained. In the range (about 5.8 kg to 6.2 kg), the member A may be charged a part of the equipment weight of the member B, or the average value (about 6.00 kg) may be calculated separately. As an application example of the first embodiment, the average value Δw _ave of the excess and deficiency (Δwa, Δwb) of the weight calculated by the measuring devices 1 of both the members A and B is measured by the measuring device 1 of the member A. An example of calculation is shown.

Explaining the third embodiment using the numerical values specifically shown in Table 3, the excess / deficiency Δwb = −6.17 Kg in member B, or the absolute value | Δwb | = 6.17 of member A Input to the measuring device 1. The measuring apparatus 1 of the member A uses the load distribution calculating unit 45 to calculate the absolute value of the shortage Δwa = 5.85 kg of the equipment weight calculated by itself and the absolute value | Δwb | The average value Δw _ave of 6.17 kg is calculated as 6.00 kg, and the numerical value is displayed.

=== Second Embodiment ===
In the first and second embodiments, the member A (B) basically stores only his / her physical information in the own measuring device 1 and uses the partner A (B) as information on the partner B (A). Relative oxygen intake% VO ₂ b (% VO ₂ a) and the partner's excess / deficiency Δwb (Δwa) in a timely manner, and target relative oxygen intake% VO ₂ ta (% VO ₂ tb) The weight Δw _ave to be redistributed was displayed and confirmed.

For example, prior to trekking, the physical information of the partner B (A) is input to the measuring device 1 of the own A (B) and the partner B is input to the measuring device 1 of the own A (B). If the regression equation information 110b (110a) of (A) is generated, the relative heart rate% HRb (% HRa) of the partner B (A) can be obtained simply by inputting the heart rate HRb (HRa) of the partner B (A). ), That is, the relative oxygen intake% VO ₂ b (% VO ₂ a) and the target oxygen intake VO ₂ tb (VO ₂ ta) of the partner B (A) can be calculated, and finally the weight Δw to be redistributed _ave can be calculated.
Thereby, troublesome numerical input operations can be minimized. Even if the partner does not have the measuring device 1, the weight Δw _ave to be redistributed can be calculated by inputting the heart rate measured by taking another pulse with another meter or himself / herself. Note that the physical information of the partner B (A) may be input using an external information processing apparatus, or may be input by operating the button 5 of the measuring apparatus 1.

=== Third embodiment ===
In the first and second embodiments, the member A operates his / her own measuring device 1 during a break or the like to calculate the oxygen intake VO ₂ a based on the heart rate HRa. However, if the operation is forgotten during the break, trekking cannot be resumed with equipment properly distributed in weight after the break. Therefore, as a third embodiment, the measurement apparatus 1 determines the start of a break, automatically calculates the oxygen intake VO ₂ based on the heart rate HR, and calculates the target relative oxygen intake% VO ₂ t. An example of displaying or prompting input of relative oxygen intake% VO _{2 of} other members is shown.

  In the third embodiment, the measuring apparatus 1 uses a body motion signal processing function in order to determine the start of a break. The body motion signal from the body motion sensor 31 indicates a change in acceleration in each of the three-dimensional directions, and the CPU 20 performs filtering processing and FFT analysis on the body motion data expressing each acceleration in the three-dimensional direction. Extracts vibrations associated with walking included in the motion signal. If a state in which vibration associated with the walking cannot be detected continues for a predetermined time, it is assumed that the user is taking a break, and the first average heart rate HR before the start of the duration is based on the first average heart rate HR. Alternatively, execute the information processing related to the weight redistribution function shown in the second embodiment.

  In addition, about the detection method of a rest state, if the acceleration which a body motion data shows is in the predetermined range irrespective of a filtering process and FFT analysis, it will judge that there is little body motion and is not walking, and the state is You may judge whether it is in a resting state with continuing for a predetermined time.

=== Other Embodiments ===
In the second embodiment, the members sharing the equipment weights input the physical information of the other party into their own measuring device 1, and the numerical input work related to the weight redistribution function can be minimized. However, it is better to do as little information as possible in advance and input on the trekking site. Therefore, the wireless communication function of the communication unit 50 constituting the measuring device 1 may be used to exchange information between the measuring devices 1 of each member.

For example, prior to trekking, a predetermined operation is performed on the two measuring devices 1 used by the members A and B to communicate with each other and store various information in the communication partner. Also, during trekking, information on the heart rate HRb (HRa) measured at any time by the measuring device 1 of the communication partner B (A) is received at any time, and the heart rate HRb (HRa) and other information previously stored Based on the physical information of the member B (A), the partner's oxygen intake VO ₂ b (VO ₂ a) and the weight Δw _ave to be redistributed are calculated in real time. Each member A (B) only needs to instruct the measurement apparatus 1 to display the calculation result. You may make it display continuously, updating constantly.

  In each of the above examples, an example of redistributing the equipment weight between two members in a party was shown, but even if there are three or more members, if all the relative oxygen intakes of other members are known, The target relative oxygen intake can be calculated from the average value, and it is possible to finally calculate the amount of decrease or increase of each when the equipment weight is redistributed by three or more members.

  The form of the measuring device 1 is not limited to the wristwatch type. As long as the pulse wave signal is constantly measured and the heart rate can be calculated from the pulse wave signal, for example, the pulse wave sensor and the control unit may be separated by a cable, wireless communication, or the like. . On the other hand, there are general-purpose computers such as a wristwatch that can be always worn, and it is easy to mount a pulse wave sensor on such a computer. Therefore, a program that is installed in an always-mounted computer equipped with a pulse wave sensor and causes the computer to function as a biological information measuring device can be used as an embodiment of the present invention.

  The present invention can be applied to an apparatus and method for measuring biological information of a user such as a pulse meter. For example, when climbing or hiking at a party for health management or dieting, etc., it can be used by each party member to adjust the weight of the equipment taking into account the physical strength difference between members. is there.

  DESCRIPTION OF SYMBOLS 1 Biological information measuring device, 4 Liquid crystal display, 5 Operation button, 10 Pulse wave sensor, 20 CPU, 21 RAM, 22 ROM, 23 Oscillation circuit 24, 25 Frequency dividing circuit, 23 Flash memory, 26 Display part, 29 Input part , 31 body motion sensor, 34 A / D conversion circuit, 41 heart rate calculator, 42 regression equation generator, 43 relative oxygen intake calculator, 44 target value calculator, 45 oxygen intake estimator, 46 load distribution calculation Part, 50 communication part.

Claims (5)

A biological information measuring device that is worn on a user's body, measures the biological information of the user, and estimates an oxygen intake amount,
A pulse wave measurement unit for measuring a pulse wave signal including a signal component corresponding to a user's pulsation;
A storage unit for storing physical information related to the physical characteristics of the user;
A heart rate calculator for calculating a heart rate based on the pulse wave signal;
A regression equation generating unit that generates regression equation information indicating the relationship between the relative heart rate and the relative oxygen intake based on the physical information;
A relative oxygen intake calculation unit that calculates a relative oxygen intake% VO ₂ a of the self corresponding to the heart rate HRa based on the regression equation information and the heart rate HRa calculated by the heart rate calculation unit;
The other person's relative oxygen intake% VO ₂ b is obtained, the average value% VO ₂ ta of the self relative oxygen intake% VO ₂ a is calculated as the target relative oxygen intake, and the target relative oxygen A target value calculation unit for calculating a difference Δ% VO ₂ a between the intake amount VO ₂ ta and the relative oxygen intake amount VO ₂ a of the self;
A biological information measuring device comprising: a target value display unit that displays and outputs the difference Δ% VO ₂ a on a display attached thereto. In claim 1,
The storage unit stores a weight wa of equipment carried by the user,
Based on the heart rate HRa and the regression information, the oxygen intake VO ₂ a is calculated, and the target oxygen intake VO ₂ is calculated based on the target relative oxygen intake% VO ₂ ta and the regression information. ₂ an oxygen intake estimation unit for calculating ₂ ta;
Based on the difference Δ% VO ₂ a calculated by the target value calculation unit, the oxygen intake VO ₂ a, the target oxygen intake VO ₂ ta, the physical information, and the weight wa of the equipment. A weight distribution calculation unit for calculating a weight Δwa that should be increased or decreased with respect to the equipment weight,
The biological information measuring device, wherein the target value display unit displays the weight Δwa to be increased or decreased on the display. In claim 2,
The storage unit stores physical information of other persons other than the user and weight wb of equipment,
The regression equation information generation unit generates the regression equation information of the other person based on the physical information of the other person,
The relative oxygen intake calculation unit inputs the heart rate HRb of the other person and corresponds to the heart rate HRb of the other person based on the heart rate HRb of the other person and the regression equation information of the other person. Calculate the relative oxygen uptake% VO ₂ b of others
The target value calculation unit calculates a difference Δ% VO ₂ b between the target relative oxygen intake% VO ₂ ta and the relative oxygen intake% VO ₂ b of the other person,
Based on the difference Δ% VO ₂ b calculated by the target value calculation unit, the physical information of the other person, and the weight wb of the other person's equipment, the weight distribution calculation unit A weight Δwb to be increased / decreased by another person and an average value Δw _ave of an absolute value of the weight Δw to be increased / decreased for each of the user and the other person,
The biological information measuring device, wherein the target value display unit displays at least one of the weight Δwb and the average value Δw _{ave of the} other person to be increased or decreased. In any one of Claims 1-3,
A body motion signal measuring unit that measures a body motion signal associated with body motion of the human body, and a rest detection unit that determines whether the user is in a rest state based on the body motion signal;
The target value calculation unit adopts the heart rate HRa immediately before the start of the break when calculating the difference Δ% VO ₂ a when the break detection unit determines that the user is in a break. A biological information measuring device characterized by that. In claim 3,
A communication unit that communicates with other biological information measurement devices by radio signals,
The storage unit receives the communication unit and the physical information of the other person other than the user and the weight of the other person's equipment, stores the communication unit in the storage unit,
The biological information measuring device, wherein the relative oxygen intake calculation unit inputs the heart rate of the other person via the conviction unit.

Images