JP2016087351A - Biological information measurement device, method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological information measurement device, method, and program capable of reducing a wrong start caused by an electromagnetic wave noise while saving power consumption.SOLUTION: In a power saving mode of operating with a power smaller than that in a normal mode, a body composition meter 10 causes a biological impedance measurement unit to measure a biological impedance at predetermined intervals. When a measured biological impedance becomes a predetermined threshold or more, the body composition meter 10 is shifted from the power saving mode to the normal mode.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a biological information measuring apparatus, method, and program.

  2. Description of the Related Art Conventionally, in a biological information measuring device such as a weight scale, a so-called step-on type biological information measuring device that activates the device by detecting that the subject is on and measures biological information such as the weight of the subject. Has been proposed.

  As a method for realizing this step-on type, for example, as shown in Patent Document 1, an output value of a load sensor is acquired while suppressing power consumption at predetermined time intervals, and the acquired output value of the load sensor is There has been proposed a biological information measuring device that starts and measures body weight when it is detected that the threshold value is exceeded.

JP 2010-38688 A

  However, the detection of the load by the load sensor is easily affected by electromagnetic wave noise, and there is a possibility that the user erroneously starts up without being on the device. For example, when other electronic devices such as a dehumidifier exist near the biological information measuring device, the output value of the load sensor may fluctuate more than a threshold due to the influence of electromagnetic noise, and may be erroneously started.

  An object of the present invention is to provide a biological information measuring device, method, and program capable of suppressing erroneous activation due to electromagnetic wave noise while suppressing power consumption.

  In order to solve the above-described problem, the biological information measuring apparatus according to the first aspect of the present invention is provided with an electrode, a measurement table on which a user rides to measure biological information, and a biological body that measures biological impedance through the electrode. Impedance measurement means and control means for determining whether or not the user is on the measurement table and controlling to measure the biological information when it is determined that the user is on the measurement table. Prepare.

  According to a second aspect of the present invention, the control means causes the bioimpedance measurement means to which power is supplied at predetermined intervals to measure the bioimpedance.

  The bio-impedance measuring means measures the bio-impedance so that the bio-impedance sampling frequency is smaller than the bio-impedance sampling frequency when the bio-information is measured. To do.

  According to a fourth aspect of the present invention, the control unit determines that the user is on the measurement table when the bioimpedance measured by the bioimpedance measurement unit is equal to or greater than a predetermined threshold.

  According to a fifth aspect of the present invention, the control means determines that the user is on the measurement table when the bioimpedance measured by the bioimpedance measurement means continues for a predetermined time within a predetermined range. .

  The biological information measuring method according to the sixth aspect of the present invention is the biological information measuring method, wherein the biological impedance is measured by the biological impedance measurement means through the electrode disposed on the measurement table for measuring the biological information. Based on the bioimpedance measured by the bioimpedance measuring means, it is determined whether or not the user is on the measurement table, and the biometric information is measured when it is determined that the user is on the measurement table. To control.

  According to a seventh aspect of the present invention, there is provided a biological information measuring program for measuring a biological impedance through an electrode disposed on a measurement table for measuring biological information on a computer, and based on the measured biological impedance. Determining whether or not the user is on the measurement table, and executing the processing including controlling to measure the biological information when it is determined that the user is on the measurement table. This is a biological information measurement program.

  According to the present invention, it is possible to suppress erroneous activation due to electromagnetic noise while suppressing power consumption.

It is a top view of a body composition meter. It is a block diagram of a body composition monitor. It is a flowchart of the biometric information measurement process performed by a control part.

  Hereinafter, embodiments of the present invention will be described. In this embodiment, a case where the biological information measuring device according to the present invention is applied to a body composition meter capable of measuring biological information such as body weight and body fat will be described.

  FIG. 1 is a plan view of the body composition meter 10 according to the present embodiment, and FIG. 2 is a block diagram showing the configuration of the electrical system of the body composition meter 10.

  As shown in FIGS. 1 and 2, the body composition meter 10 includes energized electrodes 12A and 12B, measurement electrodes 14A and 14B, a bioimpedance measurement unit 16, a display unit 18, an operation unit 20, a storage unit 22, a load sensor 24, A timer 26, a power supply 28, and a control unit 30 are provided.

  The bioelectrical impedance measurement unit 16 includes a current supply unit 16X, a voltage measurement unit 16Y, and a bioelectrical impedance calculation unit 16Z.

  The current supply unit 16X supplies a high-frequency alternating current to the energizing electrodes 12A and 12B.

  The voltage measurement unit 16Y measures the voltage between the measurement electrodes 14A and 14B.

  The bioelectrical impedance calculation unit 16Z calculates the bioelectrical impedance based on the current value of the alternating current supplied from the current supply unit 16X and the voltage value of the voltage measured by the voltage measurement unit 16Y.

  As shown in FIG. 1, on the measurement table 10 </ b> A of the body composition meter 10, four thin plate-like current-carrying electrodes 12 </ b> A and 12 </ b> B and measurement electrodes 14 </ b> A and 14 </ b> B are arranged apart from each other. The toe of the left foot is in contact with the energizing electrode 12A, the heel of the left foot is in contact with the measuring electrode 14A, the toe of the right foot is in contact with the energizing electrode 12B, and the heel of the right foot is in contact with the measuring electrode 14B.

  The energizing electrodes 12A and 12B are connected to the current supply unit 16X, and the path from the left foot of the user that contacts the energizing electrode 12A through the user's body to the right foot of the user that contacts the energizing electrode 12B (or this) It is an electrode for supplying an alternating current for measuring bioimpedance in a reverse path). The measurement electrodes 14A and 14B are connected to the voltage measurement unit 16Y, and when the alternating current is supplied, the user's left foot that the measurement electrode 14A contacts and the user's right foot that the measurement electrode 14B contacts And an electrode for measuring a voltage between the two.

  The alternating current supplied from the current supply unit 16X is supplied to the body of the user via the energizing electrodes 12A and 12B, and the voltage is measured by the voltage measurement unit 16Y via the measurement electrodes 14A and 14B. The bioelectrical impedance calculation unit 16Z calculates the bioelectrical impedance of the user based on the current and voltage values and outputs the bioelectrical impedance to the control unit 30. The control unit 30 applies the user information such as the measured bioimpedance, the measured weight, the age, the sex, and the height input by the user to a predetermined regression formula, so that the body fat percentage, the visceral fat level, etc. Is calculated. The configuration related to the measurement of bioimpedance may be the same as that of a known body composition meter.

  The display unit 18 displays the measured biological information and the like, and for example, a liquid crystal display device such as an LCD (Liquid Crystal Display) can be employed.

  The operation unit 20 includes a plurality of operation buttons. The operation unit 20 includes an input button for inputting user information such as height, sex, and age, a start button for starting the body composition meter 10, and an initial setting of the body composition meter 10. It functions as a setting button for starting a setting mode, which is a mode for setting, and a switching button for switching display items of measurement results. The display unit 18 and the operation unit 20 may be touch panels and may be configured to be operated by directly touching the screen.

  The storage unit 22 is configured by, for example, a non-volatile memory using a semiconductor element, and stores various data for processing results and processing by the control unit 30 in addition to user information.

  In this embodiment, the load sensor 24 uses a load cell as an example. The load cell includes a strain member made of a metal member that deforms according to a load, and a strain gauge attached to the strain body. When the user rides on the body composition meter 10, the strain body of the load sensor 24 is bent by the user's load and the strain gauge expands and contracts, and the resistance value (output value) of the strain gauge changes according to the expansion and contraction.

  The control unit 30 measures the weight of the user by calculating the weight based on the difference between the output value (zero point) of the load sensor 24 when no load is applied and the output value when the load is applied. The configuration related to the measurement of the body weight using the load sensor 24 may be the same as that of a known weight scale.

  The timer 26 has a function for acquiring the current time and a time measuring function for measuring a set time.

  The power supply 28 converts a voltage supplied from a battery (not shown) or a commercial power supply into a predetermined voltage and supplies the voltage to each functional unit constituting the body composition meter 10.

  The control unit 30 includes a CPU, a ROM, a RAM, and the like, and the biological information measurement program is stored in the ROM in which a biological information measurement program for causing the CPU of the control unit 30 to execute a biological information measurement process described later is stored. Is read and executed. The biological information measurement program may be provided by a recording medium such as a CD-ROM or a memory card, or may be downloaded from a server (not shown).

  The operation mode of the body composition meter 10 includes a normal mode and a power saving mode. In the normal mode, power is supplied to each functional unit of the body composition meter 10 (for example, the bioimpedance measurement unit 16, the display unit 18, the operation unit 20, the storage unit 22, the load sensor 24, the timer 26, and the control unit 30). Each of these functional units is in an operating state, and performs processing for measuring biological information such as weight and biological impedance, registration processing for user information, and the like.

  In the power saving mode, power is supplied to limited functional units (for example, the bioimpedance measurement unit 16, the operation unit 20, the storage unit 22, the load sensor 24, the timer 26, and the control unit 30) of the body composition meter 10. These limited functional units are in operation, determination processing for determining whether or not the user has been on the body composition meter 10 based on the detection state of the bioelectrical impedance, zero load update processing based on the load sensor 24, etc. Execute. Furthermore, in the power saving mode, the power supply time is limited for specific function units (for example, the bioelectrical impedance measurement unit 16 and the load sensor 24).

  Next, as an operation of the present embodiment, a biological information measurement process by a biological information measurement program executed in the control unit 30 will be described with reference to a flowchart shown in FIG. Note that the processing shown in FIG. 3 is executed when, for example, a battery is set and power is supplied to a limited function unit of the body composition meter 10.

  In step S100, the body composition meter 10 is shifted to the power saving mode. That is, the control unit 30 is a function unit that does not need to operate in the power saving mode, such as the display unit 18, and a specific function unit that limits the power supply time such as the bioelectrical impedance measurement unit 16 and the load sensor 24. The power supply 28 is controlled so as to stop the supply of power. Thereby, power consumption can be suppressed as compared with the normal mode. In particular, since the power consumption of the functional units of the measurement system such as the bioelectrical impedance measurement unit 16 and the load sensor 24 that involve a large amount of power consumption can be suppressed, the battery life can be extended particularly.

  In step S102, it is determined whether or not the operation unit 20 has been operated. If there is an operation, the process proceeds to step S104, and if there is no operation, the process proceeds to step S107.

  In step S104, the mode is shifted to the normal mode. That is, for a function unit that has stopped supplying power in the power saving mode, such as the display unit 18, and a specific function unit that limits the power supply time such as the bioelectrical impedance measurement unit 16 and the load sensor 24. The power supply 28 is controlled to supply power.

  In step S106, processing corresponding to the operation is executed. For example, if a start button for activating the body composition meter 10 is pressed, a screen such as a menu is displayed on the display unit 18, and thereafter a process corresponding to a user operation is executed.

  Further, for example, if a setting button for starting a setting mode that is a mode for performing initial setting of the body composition meter 10 is pressed, a process of registering user information as an initial setting is executed. In this case, user information including age, sex, height, and the like is input by the user, and the input user information is stored in the storage unit 22.

  On the other hand, in step S107, it is determined whether or not a predetermined time has elapsed. If the predetermined time has elapsed, the process proceeds to step S108, and if the predetermined time has not elapsed, the process proceeds to step S102. If the predetermined time is too short, power consumption increases. If the predetermined time is too long, the time until it is determined that the user gets on the body composition meter 10 becomes longer, and the time for waiting the user becomes longer. For this reason, the time until it is determined that the user has got on the body composition meter 10 while suppressing power consumption is set to a time that does not become too long, for example, about 2 seconds.

  In step S <b> 108, the power supply 28 is controlled to supply power to the bioelectrical impedance measurement unit 16 and the load sensor 24.

  In step S109, the bioimpedance measurement unit 16 is controlled so that the bioimpedance measurement unit 16 measures the bioimpedance, and the measured bioimpedance is acquired. Thereby, a high-frequency alternating current for measuring the bioimpedance is supplied to the energizing electrodes 12A and 12B by the current supply unit 16X, the voltage between the measurement electrodes 14A and 14B is measured by the current supply unit 16X, and the bioimpedance calculation unit The bioelectrical impedance is calculated by 16Z. In addition, the voltage value of the voltage detected by the voltage measurement part 16Y is about several hundred (mV) as an example.

  Here, in order to improve the accuracy of the bioimpedance, it is preferable to repeat the measurement until the measured bioimpedance is stabilized. However, in step S109, it is only necessary to determine whether or not the user has ridden. The accuracy is not required compared with the case of measuring bioimpedance. Therefore, the number of bioimpedance samplings in step S109 may be the number of times that it can be determined whether or not the user is on board, and may be smaller than the number of samplings in bioimpedance measurement in step S118 described later.

  In step S110, it is determined whether bioelectrical impedance is detected. Specifically, for example, it is determined whether or not the bioelectrical impedance measured in step S109 is equal to or more than a predetermined threshold value that can be determined that the user has got on the body composition meter 10. If the bioimpedance measured in step S109 is equal to or greater than the threshold value, the process proceeds to step S116 assuming that the user is on the body composition meter 10. On the other hand, if the bioelectrical impedance measured in step S109 is less than the threshold value, it is determined that the user is not on the body composition meter 10, and the process proceeds to step S112. The method for determining whether or not bioelectrical impedance is detected is not limited to the above method. For example, when the bioimpedance measured in step S109 is stable, specifically, it may be determined that the bioimpedance is detected when the measured bioimpedance continues for a predetermined time within a predetermined range. Good.

  Since the bioelectrical impedance measurement system has a larger S / N ratio than the load measurement system, the user does not depend on the load detection state by the load sensor 24 as in this step. By performing the determination of whether or not the composition meter 10 has been put on, erroneous activation due to electromagnetic wave noise can be suppressed.

  In step S112, a zero load update process is executed. That is, an output value at the time of no load (when the user is not on the body composition meter 10) is acquired from the load sensor 24, and the acquired output value at the time of no load is stored in the RAM as a zero point. The zero point update process may not be executed every time but may be executed every predetermined time, for example, every hour.

  In step S <b> 114, the power supply 28 is controlled to stop the supply of power to the bioelectrical impedance measurement unit 16 and the load sensor 24. In this manner, power is supplied to the bioelectrical impedance measuring unit 16 at a predetermined interval. That is, since power is supplied to the bioimpedance measurement unit 16 only for a predetermined period including measurement of bioimpedance, power consumption can be suppressed. The load sensor 24 has been described with respect to the case where the supply of power is started in step S108 and the supply of power is stopped in step S114. However, the supply of power is not started in step S108, but zero in step S112. You may make it start supply of electric power just before performing a point update process.

  In step S116, the body composition meter 10 is shifted to the normal mode. That is, the control unit 30 controls the power supply 28 to start supplying power to a functional unit such as the display unit 18 that has stopped supplying power in the power saving mode.

  In step S118, biological information is measured. That is, biological information such as body weight, body fat percentage, visceral fat level, basal metabolic rate, muscle mass, estimated bone mass, and body moisture percentage is measured.

  As for the body weight, the output value of the load sensor 24 is acquired, and the difference between the acquired output value of the load sensor 24 and the zero value stored in the RAM, that is, the output value of the load sensor 24 when no load is applied. Obtained by calculation.

  When measuring biological information such as body fat percentage, visceral fat level, basal metabolic rate, muscle mass, estimated bone mass, and body moisture percentage, the bioimpedance measurement unit 16 measures the bioimpedance, and the measured living body The impedance, the user information such as age, sex, and height stored in the storage unit 22, and the weight measured in step S118 are calculated by substituting them into a predetermined regression equation.

  As described above, in order to improve the accuracy of bioimpedance, it is preferable to repeat the measurement until the measured bioimpedance is stabilized. Therefore, in step S118, the bioimpedance is measured until the bioimpedance is stabilized. Do. Therefore, the number of bioimpedance samplings in step S118 is larger than the number of bioimpedance samplings in step S108, which does not require bioimpedance accuracy.

  In step S120, the biological information such as the weight measured in step S118 is displayed on the display unit 18 and stored in the storage unit 22.

  In step S122, it is determined whether or not a predetermined time (for example, 30 seconds) has elapsed. If the predetermined time has elapsed, the process returns to step S100, and if the predetermined time has not elapsed, the process waits until the predetermined time has elapsed.

  As described above, in the present embodiment, in the power saving mode, the bioelectrical impedance is measured every predetermined time, and when the measured bioelectrical impedance is equal to or greater than the threshold, it is determined that the user is on the body composition meter 10 Transition to mode.

  When it is determined whether or not the user is on board by monitoring the output value of the load sensor as in the prior art, the output value (voltage value) of the load sensor is as small as several (mV). It is necessary to amplify the signal and is easily affected by electromagnetic noise.

  On the other hand, in this embodiment, when measuring bioimpedance at step S108, high-frequency alternating current is supplied to the conducting electrodes 12A and 12B to measure bioimpedance. Further, the voltage value of the voltage detected by the voltage measurement unit 16Y in step S108 is about several hundreds (mV). For this reason, since the S / N ratio is higher than in the conventional case where the output value of the load sensor is monitored to determine whether or not the user is riding, it is not easily affected by electromagnetic noise, and the normal mode is mistakenly detected. It can suppress that it transfers to.

  In addition, the number of bioimpedance samplings in step S108 in the power saving mode is smaller than the number of bioimpedance samplings in step S118 in the normal mode. For this reason, the bioimpedance measurement time in step S108 is shorter than the bioimpedance measurement time in step S118, and the time from when the user rides on the body composition meter 10 to the normal mode in the power saving mode is shortened. be able to.

  Furthermore, as the composition of the body composition meter 10, a body composition meter having the same structure as the conventional one can be used, so that an increase in manufacturing cost can be suppressed.

DESCRIPTION OF SYMBOLS 10 Body composition meter 10A Measurement stand 12A, 12B Current supply electrode 14A, 14B Measurement electrode 16 Bioimpedance measurement part 16X Current supply part 16Y Voltage measurement part 16Z Bioimpedance calculation part 18 Display part 20 Operation part 22 Storage part 24 Load sensor 26 Timer 28 Power supply 30 control unit

Claims (7)

An electrode is provided, and a measurement stand for a user to ride and measure biological information;
Bioimpedance measuring means for measuring bioimpedance through the electrodes;
Control means for determining whether or not the user is on the measurement table and controlling to measure the biological information when it is determined that the user is on the measurement table;
A biological information measuring device comprising: The control means causes the bioimpedance measurement means supplied with power at predetermined intervals to measure the bioimpedance.
The biological information measuring device according to claim 1. The bioimpedance measurement means measures the bioimpedance so that the bioimpedance sampling frequency is less than the bioimpedance sampling frequency when the biometric information is measured;
The biological information measuring device according to claim 1 or 2. The said control means determines that the said user got on the said measurement stand, when the said bioimpedance measured by the said bioimpedance measurement means is more than a predetermined threshold value. Biological information measuring device. The said control means determines that the said user got on the said measurement stand, when the said bioimpedance measured by the said bioimpedance measurement means continues for a predetermined time within the predetermined range. The biological information measuring device according to item 1. The bioimpedance measurement means measures the bioimpedance through electrodes arranged on a measurement table for the user to ride on and measure biometric information,
When the control unit determines whether the user is on the measurement table based on the bio-impedance measured by the bio-impedance measurement unit, and determines that the user is on the measurement table, Biological information measurement method that controls to measure information. On the computer,
The bioimpedance is measured through an electrode arranged on a measurement table for the user to ride on and measure biometric information,
Determining whether or not the user is on the measurement table based on the measured bioelectrical impedance, and controlling to measure the biological information when it is determined that the user is on the measurement table. A biological information measurement program for executing a process including:

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