JP2023050128A - Measuring device, measuring method, and program - Google Patents

Abstract

To acquire measurement data that can determine the quality of sleep without repeating irradiation and light reception by an optical sensor incessantly during sleep.SOLUTION: A measuring device that can be mounted on a user who is a measurement target, includes: an acceleration sensor; an optical sensor with a light emitting part and a light receiving part for executing measurement on a blood flow by causing the light receiving part to receive the light emitted onto a skin surface by the light emitting part; a body posture determination part for determining a direction of a user's body on the basis of a measurement value measured by the acceleration sensor; and a measurement control part for executing main measurement for causing the optical sensor to measure blood oxygen concentration of the user when the direction of the user's body is determined to be supine by the body posture determination part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a measuring device, measuring method, and program.

Conventionally, techniques for determining sleep quality are known (see, for example, Patent Documents 1 and 2). Patent Documents 1 and 2 disclose techniques for determining sleep quality based on pulse waves and the like. A pulse wave can be measured by a non-invasive means by receiving the reflected light of the light emitted to the skin surface by an optical sensor and reflected by the blood flow in the capillaries. For this reason, it has the advantage of being easier than a method called polysomnography, which judges the state of sleep from patterns of biosignals such as electroencephalograms, eye movements, electromyograms, and electrocardiograms. It is Patent Literature 1 describes a technique for determining REM sleep/non-REM sleep based on pulse. When non-REM sleep (deep sleep) is deficient during sleep, it is determined that sleep quality is degraded. It is also possible to measure blood oxygen saturation (SpO ₂ ) with an optical sensor. Patent Document 2 describes a technique for determining sleep apnea syndrome (SAS) by measuring SpO ₂ during sleep. Since SAS causes dyspnea and light sleep, it is determined that the quality of sleep is degraded. Obesity has been pointed out as one of the factors that cause SAS, and as the number of obese people increases due to the westernization of diet, etc., there is a growing need to detect the signs of SAS and suppress the deterioration of sleep quality. ing.

Japanese Patent No. 4342455 Japanese Patent No. 6521345

However, in Patent Documents 1 and 2, the optical sensor continues to perform measurements while sleeping. For this reason, there is a problem that the light sensor must repeat irradiation and light reception constantly, resulting in an increase in power consumption. In addition, in devices such as wearable devices that are worn by users, it is important to reduce current consumption and reduce the frequency of charging in order to improve usability (convenience).

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and its object is to acquire measurement data that can determine the quality of sleep without constantly repeating irradiation and light reception by an optical sensor during sleep. To provide a measuring device, a measuring method, and a program capable of

In order to solve the above-described problems, a measuring device according to the present invention is a measuring device that can be worn by a user who is a person to be measured. An optical sensor that measures blood flow by causing the light receiving unit to receive light emitted from the surface of the skin; and a measurement control unit that performs main measurement for causing the optical sensor to measure the blood oxygen concentration of the user when the body position determination unit determines that the user's body orientation is supine. Prepare.

Further, in order to solve the above-described problems, a measuring method according to the present invention is a measuring device that can be worn by a user who is a person to be measured. A measurement method performed by a measuring device including an optical sensor that measures blood flow by causing the light receiving unit to receive light emitted on the skin surface by the unit, wherein the body position determination unit uses the acceleration sensor The user's body orientation is determined based on the measured values, and when the body posture determination section determines that the user's body orientation is supine, the optical sensor detects the Perform this measurement to measure the blood oxygen level of the user.

Further, in order to solve the above-described problems, the present invention provides a program for operating a computer as the measuring apparatus described above, the program for causing the computer to function as each unit provided in the measuring apparatus. be.

ADVANTAGE OF THE INVENTION According to this invention, the measurement data which can determine the quality of sleep can be acquired, without repeating irradiation and light reception by an optical sensor constantly during sleep.

It is a block diagram showing an example of composition of measuring device 10 concerning a 1st embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the example of the external appearance of the measuring device 10 which concerns on 1st Embodiment. It is a figure which shows the example which mounted|worn the measuring device 10 which concerns on 1st Embodiment. 4A and 4B are diagrams showing examples of measured values by the acceleration sensor 11 according to the first embodiment; FIG. 4A and 4B are diagrams showing examples of measured values by the acceleration sensor 11 according to the first embodiment; FIG. 4A and 4B are diagrams showing examples of measured values by the acceleration sensor 11 according to the first embodiment; FIG. 4A and 4B are diagrams showing examples of measured values by the acceleration sensor 11 according to the first embodiment; FIG. 4 is a flow chart showing the flow of processing performed by the measuring device 10 according to the first embodiment. 4 is a flow chart showing the flow of processing performed by the measuring device 10 according to the first embodiment. 4 is a flow chart showing the flow of processing performed by the measuring device 10 according to the first embodiment. It is a block diagram which shows the example of a structure of the measuring device 10 which concerns on 2nd Embodiment. It is a schematic diagram which shows the example of the external appearance of the measuring device 10 which concerns on 2nd Embodiment. FIG. 10 is a diagram showing an example of measured values by an acceleration sensor 11 according to the second embodiment; FIG. FIG. 10 is a diagram showing an example of measured values by an acceleration sensor 11 according to the second embodiment; FIG. FIG. 10 is a diagram showing an example of measured values by an acceleration sensor 11 according to the second embodiment; FIG. FIG. 10 is a diagram showing an example of measured values by an acceleration sensor 11 according to the second embodiment; FIG. It is a flow chart which shows a flow of processing which measuring device 10 concerning a 2nd embodiment performs. It is a flow chart which shows a flow of processing which measuring device 10 concerning a 2nd embodiment performs. It is a flow chart which shows a flow of processing which measuring device 10 concerning a 2nd embodiment performs. It is a flow chart which shows a flow of processing which measuring device 10 concerning a 2nd embodiment performs.

An embodiment of the present invention will be described below with reference to the drawings.

<First embodiment>
First, the first embodiment will be explained.

<Overview of measuring device 10>
The measuring apparatus 10 is a device that can be worn by a user who is a person to be measured. The measurement device 10 measures measurement data that can determine the user's sleep quality. The measurement data here are blood oxygen saturation (SpO ₂ ), heart rate, and body position during sleep. Of the measurement data, SpO ₂ and heart rate are measured by an optical sensor (optical sensor 12 described later) built in the measuring device 10 . The body posture of the measurement data is measured by an acceleration sensor (acceleration sensor 11 to be described later) built in the measuring device 10 . The measuring device 10 transmits measured data to an external device (user terminal 20 described later).

<Configuration of measuring device 10>
FIG. 1 is a block diagram showing a configuration example of a measuring device 10 according to the first embodiment. 10 is a computer, for example, a microcomputer (microcontroller), a PLC (Programmable Logic Controller), or the like. The measuring device 10 includes, for example, an acceleration sensor 11 , an optical sensor 12 , a timer 13 , a wearing determining section 14 , a body position determining section 15 , a measurement control section 16 and a measurement data transmitting section 17 .

The acceleration sensor 11 measures acceleration. The acceleration sensor 11 is, for example, a three-axis acceleration sensor, and measures acceleration acting in each of the three directions of the x-axis, the y-axis, and the z-axis. The acceleration sensor 11 outputs the measurement value of the measured acceleration to the body posture determination section 15 .

In this embodiment, it is determined whether or not the user is lying on his/her back based on the acceleration measured by the acceleration sensor 11 . Therefore, the acceleration sensor 11 is arranged so that the direction of a specific axis (for example, the z-axis) of the acceleration sensor 11 is perpendicular to the front of the user when the measurement device 10 is worn by the user. . The direction perpendicular to the front here is the horizontal direction when the user is standing, and the vertical direction when the user is lying down. For example, the acceleration sensor 11 is arranged so that the positive direction of the z-axis is the direction in which the gravitational acceleration acts when the user is lying on his back, that is, the direction from the ceiling to the floor when the user is lying on his back. be.

The optical sensor 12 has a light emitting portion 120 and a light receiving portion 121 . The light emitting unit 120 includes a light source such as an LED (Light Emitting Diode) and irradiates the skin surface with light. The light-receiving unit 121 includes a light-receiving element such as a photodiode, and receives reflected light of the light emitted by the light-emitting unit 120 reflected by the blood flow in the capillaries. The optical sensor 12 calculates heart rate and _SpO2 based on the light amount and frequency components of the light received by the light receiving unit 121 . The optical sensor 12 outputs the calculated heart rate and _SpO2 to the wearing determination section 14 and the measurement control section 16 .

The timer 13 starts measuring time under the control of the measurement control unit 16, and outputs a notification to the measurement control unit 16 when the time corresponding to the preset timer setting value has elapsed. The timer 13 also has a clock function, and outputs a notification to the measurement control unit 16 when a predetermined time has come.

The wearing determination unit 14 determines whether or not the user is wearing the measurement device 10 based on the amount of received light measured by the optical sensor 12 . When the measurement device 10 is not attached, the light receiving portion 121 of the optical sensor 12 receives external light (sunlight if outdoors, illumination light from a lighting device if indoors, etc.). On the other hand, when the measuring device 10 is worn, the light receiving portion of the light receiving section 121 is in close contact with the user's skin, so that external light does not reach the light receiving section 121 . Using this property, the wearing determination unit 14 determines that the user does not wear the measuring device 10 when the light receiving unit 121 receives the amount of light corresponding to the external light. On the other hand, the wearing determination unit 14 determines that the user is wearing the measurement device 10 when the light receiving unit 121 does not receive the light amount corresponding to the external light.

Alternatively, the wearing determination unit 14 may determine whether or not the user is wearing the measurement device 10 based on the amount of light received by the light receiving unit 121 along with the light emitted by the light emitting unit 120 . When the measuring device 10 is not attached, the light emitted by the light emitting unit 120 is not reflected by the blood flow, and thus no reflected light reaches the light receiving unit 121 . On the other hand, when the measuring device 10 is attached, the reflected light reaches the light receiving section 121 . Using this property, the wearing determination unit 14 determines that the user is wearing the measurement device 10 when the light receiving unit 121 receives the amount of light corresponding to the reflection. On the other hand, the wearing determination unit 14 determines that the user does not wear the measuring device 10 when the light receiving unit 121 does not receive the reflected light.

The body posture determination unit 15 determines the body posture of the sleeping user based on the acceleration measurement value measured by the acceleration sensor 11 . For example, consider a case where the positive direction of the z-axis of the acceleration sensor 11 is arranged in a direction perpendicular to the front of the user. In this case, when the acceleration corresponding to the gravitational acceleration is measured in the positive direction of the z-axis, it indicates that the gravity is directed from the ceiling to the floor. Therefore, the body posture determination unit 15 determines that the user is lying "back" when the measured value in the positive direction of the z-axis is equivalent to the gravitational acceleration. On the other hand, if the measured value in the negative direction of the z-axis is equivalent to the gravitational acceleration, the body posture determination unit 15 determines that the user is lying "face down".

The measurement control unit 16 controls the wearing determination unit 14 and the posture determination unit 15 . The measurement control unit 16 causes the wearing determination unit 14 to determine whether or not the user is wearing the measurement device 10 .

The measurement control unit 16 determines whether or not the user has gone to bed when the wearing determining unit 14 determines that the user is wearing the measuring device 10 . For example, the measurement control unit 16 determines whether the user is asleep or awake based on the acceleration measurement value measured by the acceleration sensor 11 . The measurement control unit 16 determines that the user is not asleep when the rate of change of any one of the three axes of the x-axis, y-axis, and z-axis of the acceleration sensor 11 is greater than or equal to a predetermined threshold. On the other hand, the body posture determination unit 15 determines that the user is asleep when the rate of change of any one of the three axes of the x-axis, y-axis, and z-axis of the acceleration sensor 11 is less than a predetermined threshold. .

When the user wears the measuring device 10 and determines that the user is sleeping, the measurement control unit 16 causes the body posture determination unit 15 to determine the user's body posture. Then, when the body position determination unit 15 determines that the user is sleeping “backward”, the measurement control unit 16 executes the main measurement of _SpO2 by the optical sensor 12 . The measurement control unit 16 does not perform the main measurement of SpO ₂ by the optical sensor 12 when the body position determination unit 15 does not determine that the user is sleeping “upside down”.

SAS is thought to be caused by depression of the base of the tongue and soft palate due to muscle relaxation during sleep, resulting in obstruction of the airway. In particular, it is thought that the base of the tongue and the soft palate tend to sink due to gravity when lying on the back. For this reason, it has been reported that SAS occurs remarkably when sleeping in a supine position, and the symptoms of SAS are suppressed when sleeping in a position other than the supine position (sideways, prone position, etc.). It is obtained as a valuable knowledge. In addition, it is medically known that healthy people's sleep begins with the deepest sleep (non-REM sleep), and gradually becomes light sleep and approaches awakening while repeating light sleep (REM sleep) and deep sleep. In contrast, in SAS, it is medically known that sleep is always light during sleep and deep sleep (non-REM sleep) is often not reached at the onset of sleep.

In this embodiment, measurement of _SpO2 is performed when it is determined that the user is sleeping "back". As a result, the measurement device 10 does not continuously perform the measurement using the optical sensor while the user is sleeping, so that it is possible to suppress an increase in power consumption. In this embodiment, since SpO ₂ can be obtained in a situation where SAS is particularly likely to occur, it is possible to obtain measurement data indicating signs of SAS, such as a decrease in oxygen concentration. Therefore, it is possible to acquire measurement data that can determine the quality of sleep without constantly repeating irradiation and light reception by the optical sensor during sleep.

The measurement data transmission section 17 transmits measurement data to the user terminal 20 under the control of the measurement control section 16 . The measurement data transmission unit 17 transmits the measurement data to the user terminal 20 by, for example, BLE (Bluetooth Low Energy), infrared communication, or short-range wireless communication such as wireless LAN. Also, the measurement data may be transmitted to a server, a cloud server, a PC, or the like via the user terminal 20 .

In the measuring device 10, programs for executing various processes of the measuring device 10 and temporary data used when performing various processes are stored in a storage medium. Storage media include, for example, HDD (Hard Disk Drive), flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), RAM (Random Access read/write Memory), ROM (Read Only Memory), or any of these storage media. It is configured by any combination. The CPU (Central Processing Unit) of the measuring device 10 executes a program pre-stored in the measuring device 10, thereby performing various processes (the wearing determination unit 14, the posture determination unit 15, and the measurement control unit 16). processing) is realized.

The user terminal 20 is a computer, such as a user's smart phone, mobile phone, tablet terminal, or the like.

<Appearance of measuring device 10>
Here, the appearance of the measuring device 10 will be described with reference to FIG. FIG. 2 is a schematic diagram showing an example of the appearance of the measuring device 10 according to the first embodiment. As shown in FIG. 2, the measuring device 10 incorporates a light emitting unit 120, a light receiving unit 121, and an acceleration sensor 11 along the surface worn by the user.

<Mounting of measuring device 10>
Here, a mounting image of the measuring device 10 will be described with reference to FIG. 3 . FIG. 3 is a diagram showing an example of wearing the measuring device 10 according to the first embodiment. As shown in FIG. 3, the measuring device 10 is housed in, for example, an attachment belt B as an attachment, and attached to the user's solar plexus.

<Measurement data of body position>
Here, measurement data of body posture will be described with reference to FIGS. 4A to 4D. 4A to 4D are diagrams showing examples of measured values by the acceleration sensor 11 according to the first embodiment. In this example, the positive x-axis direction of the acceleration sensor 11 is the user's body side direction, the y-axis direction is the user's body length direction, and the z-axis direction is the direction from the front to the back of the user. The side direction of the user here is the direction from the left shoulder to the right shoulder. The user's body length direction is the direction from the top of the head to the toes or the direction from the toes to the top of the head.

FIG. 4A shows an example of measured values by the acceleration sensor 11 when the user is lying "left facing". In this case, an acceleration equivalent to gravity (approximately 1 g, where g is gravitational acceleration) is measured in the positive direction of the x-axis. Also, in this case, substantially 0 (zero) acceleration is measured in both the y-axis and z-axis directions.

FIG. 4B shows an example of measured values by the acceleration sensor 11 when the user is lying "right facing". In this case, an acceleration corresponding to gravity (approximately 1 g) is measured in the negative x-axis direction. Also, in this case, substantially 0 (zero) acceleration is measured in both the y-axis and z-axis directions.

FIG. 4C shows an example of measured values by the acceleration sensor 11 when the user is lying on his back. In this case, approximately 0 (zero) acceleration is measured in both the x-axis and y-axis directions. In this case, an acceleration corresponding to gravity (approximately 1 g) is measured in the positive direction of the z-axis.

FIG. 4D shows an example of measured values by the acceleration sensor 11 when the user is lying "face down". In this case, approximately 0 (zero) acceleration is measured in both the x-axis and y-axis directions. In this case, an acceleration corresponding to gravity (approximately 1 g) is measured in the negative direction of the z-axis.

<Process flow>
Here, the flow of processing performed by the measuring device 10 will be described with reference to FIGS. 5 to 7. FIG. 5 to 7 are flowcharts showing the flow of processing performed by the measuring device 10 according to the first embodiment.

FIG. 5 shows the flow of processing for measuring heart rate and _SpO2 while the user is lying on his back.

(Step S10): The measuring device 10 determines whether or not the measuring device 10 is attached. For example, the measurement control unit 16 controls the timer 13 to output a trigger signal each time the timer 13 elapses a predetermined time (for example, 30 minutes).
In particular, when movement based on the measured value of acceleration measured by the acceleration sensor 11, for example, movement caused by the user wearing the measurement device 10, is detected, the timer 13 more frequently than before detection, For example, the trigger signal may be output at intervals of one minute. As a result, the frequency of attachment determination using the optical sensor 12 by the attachment determination unit 14 can be increased. When the timer 13 outputs the trigger signal, the measurement control section 16 outputs the amount of light received by the light receiving section 121 of the optical sensor 12 to the mounting determination section 14 at that timing. The wearing determination unit 14 determines whether or not the measuring device 10 is worn based on the amount of light received.
When the wearing determining unit 14 determines that the user is wearing the measuring device 10, the measuring device 10 proceeds to the process shown in step S11, and the wearing determining unit 14 determines that the user is not wearing the measuring device 10. If it is determined that the

(Step S11): The measuring device 10 determines whether the user has gone to bed. The measurement device 10 measures the acceleration measured by the acceleration sensor 11 when the change rate of the measured value of any one of the three axes of the x-axis, the y-axis, and the z-axis of the acceleration sensor 11 is equal to or greater than a predetermined threshold. Determine whether or not there is The measurement control unit 16 determines that the user is not asleep when the rate of change of the three-axis measurement values of the acceleration sensor 11, i.e., the x-axis, the y-axis, and the z-axis, is less than a predetermined threshold value. On the other hand, the measurement control unit 16 determines that the user is asleep when the rate of change of any one of the three axes of the x-axis, y-axis, and z-axis of the acceleration sensor 11 is greater than or equal to a predetermined threshold value. .
If the measuring device 10 determines that the user is asleep, the process proceeds to step S12, and if it is determined that the user is not asleep, the measuring device 10 returns to step S11. In this case, for example, it is determined whether or not the user has gone to bed at predetermined time intervals (for example, 30-minute intervals).

(Step S12): The measuring device 10 starts the main measurement. This measurement is performed by executing the processes shown in steps S130 to S18 below. This measurement is repeatedly performed at predetermined time intervals (for example, every 5 minutes).

(Step S13): The measuring device 10 determines whether the user is lying on his or her back. For example, the measurement control unit 16 controls the timer 13 to output the measured value of acceleration measured by the acceleration sensor 11 to the body posture determination unit 15 every time a predetermined time (for example, 5 minutes) elapses. The body posture determination unit 15 determines whether or not the user is lying on his/her back based on the measured value of acceleration measured by the acceleration sensor 11 .
If the measuring device 10 determines that the user is lying on its back, it proceeds to the process shown in step S14, and if it determines that the user is not lying on its back, it returns to the process shown in step S13.

(Step S14): The measurement device 10 measures the heart rate and _SpO2 of the user lying on his back. The measurement device 10 causes the optical sensor 12 to measure the user's heart rate and _SpO2 .

(Step S15): The measurement device 10 determines the user's posture during heart rate and _SpO2 measurement, and determines whether the user is lying on his or her back. The method for determining whether or not the user is lying on his back is the same as the method shown in step S13, and thus the description thereof is omitted.
If the measuring device 10 determines that the user is lying on its back, it returns to the process shown in step S14, and if it determines that the user is not lying on its back, it proceeds to the process shown in step S16.

(Step S16): The measurement device 10 ends the measurement of the user's heart rate and _SpO2 when determining that the user is not lying on his or her back.

(Step S17): The measuring device 10 determines whether or not the user has woken up. The method of determining whether or not the user has woken up applies the method of determining whether or not the user has gone to bed in step S11. That is, the same method as the method of determining whether the user has gone to bed shown in step S11 is performed, and if it is determined that the user has not gone to bed, it is determined that the user has woken up. On the other hand, when it is determined that the user is asleep, it is determined that the user has not woken up.
If the measuring device 10 determines that the user has not woken up, the measuring device 10 returns to the process shown in step S13. On the other hand, when the measuring device 10 determines that the user has woken up, the processing proceeds to step S18.

(Step S18): When the user wakes up, the measuring device 10 ends the main measurement.

FIGS. 6 and 7 show the flow of processing for measuring SpO ₂ when the user is lying on his back while in REM sleep. Steps S20, S21, and S27 in FIG. 6 are the same processes as steps S10, S11, and S17 in FIG. 5, so description thereof will be omitted.

(Step S22): The measuring device 10 starts the main measurement. This measurement is performed by executing the processes shown in steps S230 to S28 below. This measurement is repeatedly performed at predetermined time intervals (for example, every 5 minutes).

(Step S23): The measuring device 10 determines whether or not the heartbeat is less than the threshold when a predetermined time (for example, 90 minutes) has passed since the start of sleep. For example, the measurement control unit 16 causes the timer 13 to output a trigger signal at the timing when a predetermined time (for example, 90 minutes) has elapsed. When the trigger signal is output from, the measurement control unit 16 causes the optical sensor 12 to measure the heartbeat at that timing, and obtains the measured heartbeat. The measurement control unit 16 determines whether or not the heartbeat is less than the threshold by comparing the acquired heartbeat and the threshold.
If the measuring device 10 determines that the heartbeat is less than the threshold, the process proceeds to step S24. On the other hand, when the measuring device 10 determines that the heartbeat is equal to or greater than the threshold, the processing proceeds to step S25.

(Step S24): The measuring device 10 determines that the user is in non-REM sleep (deep sleep) when the heart rate is less than the threshold. In this case, the measuring device 10 proceeds to the process shown in step S26.

(Step S25): The measuring device 10 determines that the user is in REM sleep (light sleep) when the heart rate is equal to or greater than the threshold. In this case, the measuring device 10 proceeds to the process indicated by A. The process shown in A is described in FIG.

(Step S26): When the user is in non-REM sleep (deep sleep), the measuring device 10 determines whether or not the user's heartbeat and movement are periodic. The measuring device 10 determines whether or not the heartbeat has periodicity, for example, by frequency-analyzing the time-series change of the heartbeat. In this case, the measuring device 10 determines that the heartbeat has periodicity when the intensity of a specific frequency band is high in the frequency characteristics of the heartbeat. On the other hand, the measuring device 10 determines that the heartbeat does not have periodicity when the intensities of all frequency bands are similar in the frequency characteristics of the heartbeat.
The measurement device 10 determines whether or not the user's movement has periodicity by counting the number of times the amount of change in acceleration exceeds the threshold within a certain period of time. If the amount of change in acceleration is less than a threshold, or if there is movement with an amount of change in acceleration equal to or greater than the threshold but the number of movements is less than a specified number of times, the measurement device 10 determines the period of the user's movement. It is judged that the non-REM sleep is continuing. On the other hand, the measuring device 10 determines that the user's movement is not periodic when the number of times of movement in which the amount of change in acceleration is equal to or greater than the threshold is equal to or greater than the specified number of times.
If the measuring device 10 determines that the heartbeat and motion are periodic, the process proceeds to step S27. On the other hand, if the measuring device 10 determines that at least one of the heartbeat and the movement is not periodic, the process proceeds to A.

(Step S28): When the user wakes up, the measuring device 10 ends the main measurement.

FIG. 7 shows the flow of processing indicated by A in FIG. The processes shown in steps S30, S32, and S34 in FIG. 7 are the same as the processes in steps S13, S15, and S17 in FIG. 5, so description thereof will be omitted.

(Step S31): The measuring device 10 measures _SpO2 while the user is in non-REM sleep and lying on his/her back. The measurement device 10 causes the optical sensor 12 to measure the user's _SpO2 .

(Step S33): If the measuring device 10 determines that the user is not lying on his or her back while measuring the _SpO2 of the user, the measuring device ₁₀ ends the SpO2 measurement.

(Step S35): If the measuring device 10 determines that the user in non-REM sleep is not lying on his or her back, the measuring device ₁₀ terminates SpO2 measurement.

As described above, the measuring device 10 of the first embodiment is a device that can be worn by a user who is a person to be measured. The measurement device 10 includes an acceleration sensor 11 , an optical sensor 12 , a body position determination section 15 and a measurement control section 16 . Optical sensor 12 has light emitting unit 120 and light receiving unit 121. Optical sensor 12 measures blood flow (for example, SpO ₂ or / and heart rate). The body posture determination unit 15 determines the direction of the user's body (body posture) based on the measurement values measured by the acceleration sensor 11 . The measurement control unit 16 causes the optical sensor 12 to measure SpO ₂ (blood oxygen concentration) of the user when the body posture determination unit 15 determines that the user's body orientation is "upside down". Execute. As a result, the measurement device 10 of the first embodiment does not continuously perform the measurement using the optical sensor while the user is asleep. Therefore, an increase in power consumption can be suppressed. Then, the measuring device 10 can acquire SpO ₂ especially in a situation where SAS is likely to occur remarkably. For this reason, it is possible to acquire measurement data indicating signs of SAS, such as a decrease in oxygen concentration, and to obtain measurement data that can determine the quality of sleep without constantly repeating irradiation and light reception by the optical sensor during sleep. can be obtained.

Moreover, the measuring device 10 of the first embodiment is worn on the user's plexus. This makes it possible to measure the heart rate at a position close to the heart. That is, the measuring device 10 of the first embodiment can measure heartbeats with higher accuracy than when heartbeats are measured at an end portion such as a fingertip as described in Cited Document 1. . It also measures heart rate whether or not the neck is on the pillow, compared to configurations that measure pressure pulse waves in the neck by incorporating the measurement device into the pillow as described in the cited document. heart rate can be stably measured.

In addition, Patent Literature 2 describes that non-contact charging is performed by embedding non-contact charging equipment in bedding such as a bed in preparation for long-term measurement. However, with this configuration, only bedding in which the non-contact charging facility is embedded can be charged. On the other hand, in the measuring apparatus 10 of the first embodiment, the measurement can be performed only when the person is lying on his/her back, and the measurement cannot be performed in other states. Power consumption can be suppressed.

Although the case where the measurement device 10 is worn on the user's solar plexus has been described as an example in consideration of heart rate measurement accuracy and wearing comfort, the present invention is not limited to this. In the measuring device 10 of the first embodiment, at least the specific axial direction of the acceleration sensor 11 should be arranged in a direction perpendicular to the front of the user when worn. This allows the body posture determining unit 15 to determine whether or not the user's body is facing up based on the axial direction measurement value measured by the acceleration sensor 11 .

Further, in the above-described first embodiment, the case where the measuring device 10 is housed in the mounting belt B and attached is described as an example, but the present invention is not limited to this. The measuring device 10 may be stored in a storage pocket provided inside clothing such as underwear as a wearing device, or may be attached to the user's body by attaching it to underwear or the like using a clip-like jig. . Alternatively, it may be worn by being attached to the user's body or underwear using an adhesive member such as a sticker.

Moreover, the measuring device 10 of the first embodiment further includes a wearing determination section 14 . The wearing determination unit 14 determines whether or not the user is wearing the measurement device 10 based on the amount of light received by the light receiving unit 121 of the optical sensor 12 . The measurement control unit 16 executes the main measurement when it is determined that the user is wearing the measurement device 10 . As a result, the measurement device 10 of the embodiment can prevent erroneous start of the main measurement when the device is not attached.

Further, in the measuring apparatus 10 of the first embodiment, the measurement control unit 16 determines whether or not the user is asleep based on the measurement value measured by the acceleration sensor 11, and determines that the user is asleep. If so, perform this measurement. Thereby, the measuring device 10 of the first embodiment can prevent the user from erroneously starting the main measurement when the user has not yet gone to bed.

In addition, in the measuring device 10 of the first embodiment, the measurement control unit 16 causes the optical sensor 12 to measure the user's heart rate, and when the user's heart rate is equal to or higher than the threshold value, the main measurement is performed. As a result, the measurement device 10 of the first embodiment can be controlled not to start the main measurement when the user is in non-REM sleep, and the measurement can be performed during sleep regardless of whether the user is in non-REM sleep. Power consumption can be further reduced as compared with the case of

In addition, in the measurement device 10 of the first embodiment, the measurement control unit 16 causes the optical sensor 12 to measure the user's heart rate, and performs this measurement when the user's heart rate does not have periodicity. As a result, the measurement apparatus 10 of the first embodiment can be controlled not to start the main measurement when the user's heartbeat is periodic, and can perform measurement during sleep regardless of whether the heartbeat is periodic or not. Power consumption can be further reduced as compared with the case of

In addition, in the measurement apparatus 10 of the first embodiment, the measurement control unit 16 determines whether or not the user's movement has periodicity based on the measurement value measured by the acceleration sensor 11, and determines whether the user's movement has periodicity. This measurement is performed when there is no periodicity. As a result, the measurement apparatus 10 of the first embodiment can be controlled not to start the main measurement when the user's movement is periodic, and the measurement can be performed during sleep regardless of the periodicity of the movement. Power consumption can be further reduced as compared with the case of

<Second embodiment>
Next, a second embodiment will be described. This embodiment differs from the above-described first embodiment in that it is determined whether or not there is an abnormality in the user's breathing using the acceleration measurement result. In the following description, points different from the above-described first embodiment will be described, and the same reference numerals as those of the first embodiment will be assigned to the same configurations as those of the above-described first embodiment, and description thereof will be omitted.

FIG. 8 is a block diagram showing an example of the configuration of the measuring device 10 according to the second embodiment. As shown in FIG. 8, the measuring device 10 includes, for example, a respiration determining section 18. FIG. The breathing determination unit 18 determines whether or not there is an abnormality in the user's breathing based on the measured value, ie, the acceleration, measured by the acceleration sensor 11 .

In this embodiment, the acceleration sensor 11 is worn by the user to measure acceleration according to the expansion and contraction of the abdomen associated with breathing of the user. This makes it possible to determine whether or not there is an abnormality in the user's breathing based on the measured value of acceleration. The acceleration sensor 11 outputs the measurement value of the measured acceleration to the respiration determining section 18 .

The breathing determination unit 18 determines whether or not the user is breathing based on the state of the expansion and contraction of the abdomen accompanying breathing of the user, which is measured by the acceleration sensor 11 . For example, the respiration determining unit 18 extracts the maximum and minimum values of acceleration in a unit time (for example, one minute) from the acceleration measurement result, and the variation amount, which is the difference between the extracted maximum and minimum values, is If it is equal to or greater than the threshold, it is determined that the user is breathing. On the other hand, if the amount of variation is less than the threshold, the breathing determination unit 18 determines that the user is not breathing. If the user is not breathing, the breathing determination unit 18 determines that the user's breathing is abnormal.

In addition, the respiration determination unit 18 determines whether or not the number of respirations per unit time is equal to or greater than a threshold based on the state of the expansion and contraction of the abdomen accompanying breathing of the user, which is measured by the acceleration sensor 11. . For example, the respiration determination unit 18 extracts the number of times that the amount of variation is greater than or equal to the threshold value in a unit time. The breathing determination unit 18 calculates the number of breaths per unit time by regarding two fluctuations of the extracted number of times, that is, fluctuations in the increasing direction and fluctuations in the decreasing direction, as one breath. The respiration determination unit 18 compares the calculated respiration rate with a threshold and determines whether the respiration rate per unit time is equal to or greater than the threshold. The breathing determination unit 18 determines that there is no abnormality in the user's breathing when the user's breathing rate is equal to or greater than the threshold. On the other hand, if the user's breathing rate is less than the threshold, the breathing determination unit 18 determines that the user's breathing is abnormal.

For example, the breathing determination unit 18 first determines whether or not the user is breathing, and if the user is breathing, determines whether or not the number of breaths per unit time is equal to or greater than the threshold. . Alternatively, the breathing determination unit 18 may concurrently execute a process of determining whether the user is breathing and a process of determining whether the number of breaths per unit time is equal to or greater than the threshold. good too.

Further, the respiration determination unit 18 may determine that the user's respiration is abnormal when the respiration rate per unit time is gradually decreasing. In this case, the respiration determination unit 18 stores the calculated respiration rate each time it calculates the respiration rate per unit time. The respiration determining unit 18 determines that the user's breathing is abnormal when a subtraction value obtained by subtracting the respiration rate at the time of the current measurement from the respiration rate at the time of the previous measurement is equal to or greater than a threshold value.

Further, the breathing determination unit 18 may determine that there is an abnormality in the user's breathing when the amount of change is gradually decreasing. In this case, the respiration determination unit 18 extracts the maximum and minimum values of the acceleration in a unit time (for example, one minute) from the acceleration measurement result, and the variation amount, which is the difference between the extracted maximum and minimum values. memorize. The respiration determining unit 18 determines that the user's breathing is abnormal when a subtraction value obtained by subtracting the amount of variation at the time of the current measurement from the amount of variation at the time of the previous measurement is greater than or equal to a threshold. Also, if it is determined that the user has stopped breathing for a specific time period (for example, 10 seconds) or longer, that is, if the user is not breathing, it may be determined that the user's breathing is abnormal. good.

The measurement control section 16 controls the respiration determination section 18 . The measurement control unit 16 causes the breathing determination unit 18 to determine whether or not there is an abnormality in the user's breathing.

Here, a mounting image of the measuring device 10 according to the present embodiment will be described with reference to FIG. 9 . FIG. 9 is a diagram showing an example of wearing the measuring device 10 according to the second embodiment. As shown in FIG. 9, the measuring device 10 is housed in, for example, a mounting belt B as a wearer, and is worn under the navel or lower abdomen of the user. This makes it possible to directly measure the expansion and contraction movements of the abdomen associated with breathing.

In addition, in this embodiment, the attachment site|part of the measuring device 10 is not limited to below a navel and a lower abdomen. The measurement device 10 may be worn at least on the abdomen, not on the distal end such as fingertips. The abdomen here includes trunks such as the user's neck, pit, chest, waist, navel, lower back, and the like. For example, as shown in FIG. 3, even when the measuring device 10 is attached to the solar plexus, it is possible to determine whether or not there is an abnormality in the user's breathing based on the expansion and contraction of the abdomen accompanying breathing. is.

Acceleration measurement data will now be described with reference to FIGS. 10A to 10D. 10A to 10D are diagrams showing examples of measured values by the acceleration sensor 11 according to the second embodiment. In this example, the positive x-axis direction of the acceleration sensor 11 is the user's body side direction, the y-axis direction is the user's body length direction, and the z-axis direction is the direction from the front to the back of the user.

FIG. 10A shows an example of measured values by the acceleration sensor 11 when the user is lying on his back. In this case, 0 (zero) is measured in the x-axis and y-axis directions, and the acceleration corresponding to gravity (approximately 9800 mg) is measured in the z-axis positive direction. Then, fine periodic vibrations are measured in the y-axis direction. This periodic vibration is considered to be a change in acceleration caused by the expansion and contraction of the abdomen accompanying breathing.

FIG. 10B shows an example of measured values by the acceleration sensor 11 when the user is lying "facing right". In this case, 0 (zero) is measured in the y-axis direction, and the acceleration corresponding to gravity is measured dispersed in the x-axis and z-axis directions. Fine periodic vibrations are then measured in the x-axis and z-axis directions. This periodic vibration is considered to be a change in acceleration caused by the expansion and contraction of the abdomen accompanying breathing.

FIG. 10C shows an example of measured values by the acceleration sensor 11 when the user is lying "left facing". In this case, 0 (zero) is measured in the y-axis direction, and the acceleration corresponding to gravity is measured dispersed in the x-axis and z-axis directions. Then, fine periodic vibrations are measured in the z-axis direction. This periodic vibration is considered to be a change in acceleration caused by the expansion and contraction of the abdomen accompanying breathing.

FIG. 10D shows an example of measured values by the acceleration sensor 11 when the user is lying "face down". In this case, 0 (zero) is measured in the x-axis and y-axis directions, and acceleration corresponding to gravity is measured in the z-axis direction. Then, fine periodic vibrations are measured in the y-axis direction. It is believed that this periodic vibration is caused by the expansion and contraction movements of the abdomen associated with breathing. Here, in the case of proneness in FIG. 10D, the amplitude of the periodic vibration is smaller than in the case of lying on the back in FIG. 10A. This is thought to be because, in the prone position, the abdomen is in contact with the bedding, which suppresses fluctuations due to expansion and contraction movements of the abdomen.

Here, the flow of processing performed by the measuring device 10 will be described with reference to FIGS. 11 and 12. FIG. 11 and 12 are flowcharts showing the flow of processing performed by the measuring device 10 according to the second embodiment.

FIG. 11 is a diagram corresponding to FIG. 5 in the first embodiment. FIG. 11 shows, as a second embodiment, the flow of processing for measuring the heart rate and _SpO2 when the user is lying on his back and his breathing is abnormal. The processes shown in steps S110-S113, S115-S116, and S118-S120 in FIG. 11 are the same as steps S10-S13, S14-S15, and S16-S18 in FIG.

(Step S114): When determining that the user is lying on his or her back, the measuring device 10 determines whether or not there is an abnormality in the user's breathing. For example, the measurement control unit 16 outputs the measurement result of the acceleration measured by the acceleration sensor 11 to the respiration determination unit 18, and causes the respiration determination unit 18 to determine whether or not there is an abnormality in the user's respiration. The breathing determining unit 18 determines that the user is not breathing when the measurement result does not show the expansion and contraction of the abdomen accompanying breathing, specifically, when the fluctuation amount is equal to or less than a threshold value, that is, when the user is breathing. is determined to be abnormal. Further, the breathing determination unit 18 determines that the user's breathing is abnormal when the number of breaths per unit time is equal to or less than the threshold.
If the measuring device 10 determines that the user's breathing is abnormal, the process proceeds to step S115, and if it is determined that the user's breathing is normal, the measuring device 10 returns to the process of step S113.

(Step S117): When determining that the user is lying on his or her back, the measurement device 10 determines whether or not there is an abnormality in the user's breathing. The method of determining whether or not there is an abnormality in the user's breathing is the same as in step S115.
If the measuring device 10 determines that the user's breathing is normal, the process proceeds to step S115, and if it determines that the user's breathing is normal, the process proceeds to step S118.

FIG. 12 is a diagram corresponding to FIG. 7 in the first embodiment. FIG. 12 shows the flow of processing indicated by A in FIG. 6 in the second embodiment. The processes shown in steps S130, S132 to S133, and S135 to S137 in FIG. 12 are the same processes as steps S30, S31 to S32, and S33 to S35 in FIG. 7, so description thereof will be omitted.

(Step S131): When determining that the user is lying on his/her back, the measuring device 10 determines whether or not there is an abnormality in the user's breathing. The method of determining whether or not there is an abnormality in the user's breathing is the same as in step S115.
If the measuring device 10 determines that there is an abnormality in the user's breathing, the process proceeds to step S132, and if it determines that the user's breathing is normal, the measuring apparatus 10 proceeds to the process of step S130.

(Step S134): When determining that the user is lying on his/her back, the measuring device 10 determines whether or not the user's breathing is abnormal. The method of determining whether or not there is an abnormality in the user's breathing is the same as in step S115.
If the measuring device 10 determines that the user's breathing is normal, the process proceeds to step S133, and if it determines that the user's breathing is normal, the process proceeds to step S135.

<Modification of Second Embodiment>
Next, a modified example of the second embodiment will be described. This modification differs from the above embodiment in that _SpO2 is measured when the user has an abnormality in breathing, regardless of whether the user is lying on his or her back. In the following description, differences from the above-described embodiment will be described, and the same reference numerals as those of the embodiment will be assigned to the same configurations as those of the above-described embodiment, and the description thereof will be omitted.

In SAS, during sleep, breathing often stops when the user is lying on their back. However, it cannot be denied that breathing stops even in other postures, such as when sleeping on one's side. For example, "snoring" is a phenomenon that has been pointed out to be closely related to SAS and situations in which breathing stops during sleep. For example, regarding "snoring", about 80% of subjects showed improvement in "snoring" when the user's posture changed from "back" to "sideways". ” does not improve. From these reports, there may be users who experience SAS-induced breathlessness even when they are not sleeping on their backs.

As a countermeasure against this, in this modified example, SpO ₂ is measured when the user has an abnormality in breathing regardless of whether the user is lying on his or her back. As a result, when the user's breathing is abnormal, that is, when it is considered that a dangerous situation such as respiratory arrest due to SAS is approaching, _SpO2 is measured, and measurement data that indicates whether it is a sign of SAS is acquired. It becomes possible to

In this modified example, the flow of processing performed by the measuring device 10 will be described with reference to FIGS. 13 and 14. FIG. 13 and 14 are flowcharts showing the flow of processing performed by the measuring device 10 according to the modified example of the second embodiment.

FIG. 13 is a diagram corresponding to FIG. 5 in the first embodiment. FIG. 13 shows, as a modification of the second embodiment, the flow of processing for measuring the heart rate and _SpO2 when the user has an abnormality in breathing regardless of whether the user is lying on his or her back. ing. The processes shown in steps S210 to S212, S214, and S216 to S218 in FIG. 13 are the same as steps S10 to S12, S14, and S16 to S18 in FIG.

(Step S213): The measuring device 10 determines whether or not the user's breathing is abnormal. The method of determining whether or not there is an abnormality in the user's breathing is the same as in step S115.
If the measuring device 10 determines that the user's breathing is abnormal, the process proceeds to step S214, and if it is determined that the user's breathing is normal, the measuring device 10 returns to the process of step S213.

(Step S215): The measuring device 10 determines whether or not the user's breathing is abnormal. The method of determining whether or not there is an abnormality in the user's breathing is the same as in step S115.
The measuring device 10 returns to the process shown in step S214 when it determines that the user's breathing is abnormal, and proceeds to the process shown in step S216 when it determines that the user's breathing is normal.

FIG. 14 is a diagram corresponding to FIG. 7 in the first embodiment. FIG. 14 shows the flow of processing indicated by A in FIG. 6 in a modification of the second embodiment. The processes shown in steps S231 and S233 to S235 in FIG. 14 are the same as the processes in steps S31 and S33 to S35 in FIG. 7, so description thereof will be omitted.

(Step S230): The measuring device 10 determines whether or not the user's breathing is abnormal. The method of determining whether or not there is an abnormality in the user's breathing is the same as in step S115.
If the measuring device 10 determines that the user's breathing is normal, the process proceeds to step S231, and if it determines that the user's breathing is normal, the process proceeds to step S230.

(Step S232): The measurement device 10 determines whether or not the user's breathing is abnormal. The method of determining whether or not there is an abnormality in the user's breathing is the same as in step S115.
The measuring device 10 returns to the process shown in step S232 when it determines that the user's breathing is abnormal, and proceeds to the process shown in step S233 when it determines that the user's breathing is normal.

As described above, the measuring device 10 according to the second embodiment is a measuring device that can be worn by a user who is a person to be measured. The measurement device 10 includes an acceleration sensor 11 , an optical sensor 12 , a respiration determination section 18 , a body position determination section 15 and a measurement control section 16 . The respiration determination unit 18 determines whether or not there is an abnormality in the user's respiration based on the measured value measured by the acceleration sensor 11 . When the body posture determination unit 15 determines that the user's body orientation is supine and the breathing determination unit 18 determines that the user's breathing is abnormal, the measurement control unit 16 causes the optical sensor 12 to detect the user's position. Perform this measurement to measure the blood oxygen concentration of As a result, the measuring device 10 of the second embodiment can measure the _SpO2 of the user when the user is lying on his back and has an abnormality in his breathing. Since there is no need to measure SpO ₂ when there is no abnormality in breathing, it is possible to reduce the power consumption required for measuring SpO ₂ . In addition, when measuring SpO ₂ , it is possible to determine whether there is an abnormality in breathing _. Monitoring becomes possible, and it becomes possible to accurately capture the situation where breathing stops.

Moreover, the measuring device 10 according to the modified example of the second embodiment is a measuring device that can be worn by a user who is a person to be measured. The measurement device 10 includes an acceleration sensor 11 , an optical sensor 12 , a respiration determination section 18 and a measurement control section 16 . When the respiration determination unit 18 determines that the user's breathing is abnormal, the measurement control unit 16 performs the main measurement that causes the optical sensor 12 to measure the blood oxygen concentration of the user. As a result, the measuring device 10 according to the modification of the second embodiment can measure the _SpO2 of the user even when the user is not lying on his back and has an abnormality in his breathing. Therefore, even if the user does not lie on his or her back, it is possible to detect a situation in which breathing stops due to SAS, even if the user is likely to stop breathing. In addition, since SpO ₂ does not need to be measured when there is no abnormality in breathing, power consumption required for SpO ₂ measurement can be suppressed. In addition, when measuring SpO ₂ , it is possible to determine whether there is an abnormality in breathing _. Monitoring becomes possible, and it becomes possible to accurately capture the situation where breathing stops.

Further, in the measuring device 10 according to the second embodiment and the modified example of the second embodiment, the respiration determination unit 18 determines whether the user is breathing based on changes in acceleration according to the expansion and contraction of the abdomen accompanying breathing. and whether the respiratory rate per unit time is equal to or greater than the threshold. The breathing determination unit 18 determines that the user's breathing is abnormal when the user is not breathing or when the number of breaths per unit time is a threshold. As a result, in the measuring device 10 according to the second embodiment and the modified example of the second embodiment, when breathing is not recognized or due to contraction, depending on fluctuations due to expansion and contraction of the abdomen accompanying breathing If there are variations but the number of variations is small, it can be assumed that the user's breathing is abnormal. Therefore, it is possible to accurately determine whether or not there is an abnormality in breathing.

Moreover, in the measuring device 10 according to the second embodiment and the modified example of the second embodiment, the measuring device 10 is worn on the user's trunk including the plexus, the navel, and the abdomen. As a result, the measuring device 10 according to the second embodiment and the modification of the second embodiment can measure fluctuations due to expansion and contraction of the abdomen associated with breathing.

All or part of the measuring device 10 in at least one embodiment described above may be realized by a computer. In that case, a program for realizing this function may be recorded in a computer-readable recording medium, and the program recorded in this recording medium may be read into a computer system and executed. It should be noted that the "computer system" referred to here includes hardware such as an OS and peripheral devices. The term "computer-readable recording medium" refers to portable media such as flexible discs, magneto-optical discs, ROMs and CD-ROMs, and storage devices such as hard discs incorporated in computer systems. Furthermore, "computer-readable recording medium" means a medium that dynamically retains a program for a short period of time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. It may also include something that holds the program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or client in that case. Further, the program may be for realizing a part of the functions described above, or may be capable of realizing the functions described above in combination with a program already recorded in the computer system, It may be implemented using a programmable logic device such as an FPGA (Field Programmable Gate Array).

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design and the like are included within the scope of the gist of the present invention.

DESCRIPTION OF SYMBOLS 10... Measurement apparatus 11... Acceleration sensor 12... Optical sensor 120... Light-emitting part 121... Light-receiving part 13... Timer 14... Wearing determination part 15... Posture determination part 16... Measurement control part 17... Measurement Data transmission unit 18 Respiration determination unit 20 User terminal

Claims (11)

A measuring device that can be worn by a user who is a person to be measured,
an acceleration sensor;
an optical sensor having a light-emitting portion and a light-receiving portion, wherein light emitted from the light-emitting portion to the skin surface is received by the light-receiving portion to measure blood flow;
a body posture determination unit that determines the orientation of the user's body based on the measurement value measured by the acceleration sensor;
a measurement control unit that performs main measurement for causing the optical sensor to measure the blood oxygen concentration of the user when the body position determination unit determines that the user's body orientation is supine;
A measuring device comprising a A measuring device that can be worn by a user who is a person to be measured,
an acceleration sensor;
an optical sensor having a light-emitting portion and a light-receiving portion, wherein light emitted from the light-emitting portion to the skin surface is received by the light-receiving portion to measure blood flow;
a breathing determination unit that determines whether or not there is an abnormality in the breathing of the user based on the measured value measured by the acceleration sensor;
a body posture determination unit that determines the orientation of the user's body based on the measurement value measured by the acceleration sensor;
When the body position determination unit determines that the user's body orientation is supine and the breathing determination unit determines that there is an abnormality in the user's breathing, a measurement control unit that performs the main measurement for measuring the oxygen concentration;
A measuring device comprising a A measuring device that can be worn by a user who is a person to be measured,
an acceleration sensor;
an optical sensor having a light-emitting portion and a light-receiving portion, wherein light emitted from the light-emitting portion to the skin surface is received by the light-receiving portion to measure blood flow;
a breathing determination unit that determines whether or not there is an abnormality in the breathing of the user based on the measured value measured by the acceleration sensor;
a measurement control unit that, when the respiration determination unit determines that the user's breathing is abnormal, causes the optical sensor to measure the blood oxygen concentration of the user, and performs a main measurement;
A measuring device comprising a The breathing determination unit determines whether the user is breathing and whether the number of breaths per unit time is equal to or greater than a threshold, based on changes in acceleration according to the expansion and contraction of the abdomen accompanying breathing. determining that the user's breathing is abnormal if the user is not breathing or if the breathing rate per unit time is less than a threshold;
The measuring device according to claim 2 or 3. The acceleration sensor is arranged such that a specific axial direction of the acceleration sensor is perpendicular to the front surface of the user when the user wears the measurement device,
The body posture determination unit determines whether or not the user's body orientation is supine based on the axial direction measurement value measured by the acceleration sensor.
The measuring device according to claim 1 or 2. attached to the user's core, including the user's plenum, navel, and abdomen;
The measuring device according to any one of claims 1 to 3. Further comprising a wearing determination unit that determines whether the user is wearing the measurement device based on the amount of light received by the light receiving unit of the optical sensor,
The measurement control unit performs the main measurement when the wearing determination unit determines that the user is wearing the measurement device.
The measuring device according to any one of claims 1 to 3. The measurement control unit determines whether the user is asleep based on the measurement value measured by the acceleration sensor, and executes the main measurement when it is determined that the user is asleep.
The measuring device according to any one of claims 1 to 3. The measurement control unit causes the optical sensor to measure the user's heart rate, and performs the main measurement when the user's heart rate is equal to or greater than a threshold.
The measuring device according to any one of claims 1 to 3. A measurement device that can be worn by a user who is a measurement subject, and has an acceleration sensor, a light emitting unit, and a light receiving unit, and causes the light receiving unit to receive light emitted from the light emitting unit to the skin surface. A measuring method performed by a measuring device comprising an optical sensor that measures blood flow,
a body posture determination unit determining the orientation of the user's body based on the measurement value measured by the acceleration sensor;
a measurement control unit that, when the body position determination unit determines that the user's body orientation is supine, performs a main measurement that causes the optical sensor to measure the blood oxygen concentration of the user;
Measuring method. A program for causing a computer to operate as the measurement device according to any one of claims 1 to 3, the program causing the computer to function as each part provided in the measurement device.

Images