JP2015178011A - sleep evaluation device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evaluate the quality of sleep in a method more simple than in the case of using pulse waves and pulse intervals.SOLUTION: When acquiring each information transmitted from an acceleration sensor 2, a detection part 111 interprets the information to detect the angle of a posture and the amount of body motion. A measurement part 113 measures a pulse rate of a user on the basis of a digital signal transmitted from a photoelectric sensor 3 attached to a finger or the like of the user. A discrimination part 112 applies a rule stored in a storage part 12 to discriminate whether the user falls asleep. When the discrimination part 112 discriminates that the user falls asleep, a pretreatment part 114 performs a calculation corresponding to pretreatment on the basis of the pulse rate of the user transmitted from the measurement part 113. A determination part 115 refers to change speeds of pulse rates described in a sleep state table 121 stored in the storage part 12, specifies a sleep state corresponding to the calculated change speed, and evaluates the quality of the sleep.

Description

  The present invention relates to a sleep evaluation device, a sleep evaluation system, and a program for evaluating the quality of sleep.

  One of the health indicators is sleep quality. In general, sleep is classified into so-called non-REM sleep and REM sleep. REM sleep is a state in which the eyeball moves violently during sleep. It is known that REM sleep and non-REM sleep are repeated in a certain pattern for sleep of higher animals having developed cerebral cortex such as mammals. When any sleep disorder occurs, the above-described pattern is disturbed. Therefore, the quality of sleep can be evaluated and diagnosed by monitoring the appearance patterns of sleep states such as REM sleep and non-REM sleep and comparing them with the patterns of healthy individuals.

  Although the sleep state is indicated by an electroencephalogram, in order to measure the electroencephalogram, it is necessary to attach a bioelectrode for acquiring a bioelectric signal to the user. Therefore, it is generally difficult to easily measure an electroencephalogram in daily life. Therefore, a technique for estimating a sleep state from a pulse wave or a pulse interval instead of an electroencephalogram has been developed. Patent Document 1 discloses a method of measuring an autonomic nerve index by measuring a pulse interval.

JP 2008-237574 A

  In Patent Document 1, since the measurement target is a pulse interval, the memory capacity required for accumulation is small compared to the raw pulse wave data accumulated in the conventional autonomic nerve analysis. However, when evaluating the measured pulse interval, a high level of data processing capability is required to perform a relatively advanced analysis process. For this reason, the technique described in Patent Document 1 has a problem that it is difficult to reduce the size of the apparatus, and the power supply by the battery cannot withstand long-time use.

  The present invention has been made in view of such circumstances, and an object thereof is to make it possible to evaluate the quality of sleep by a simpler method than in the case of using a pulse wave or a pulse interval. .

In order to solve the above-described problem, a sleep evaluation apparatus according to the present invention includes a measuring unit that measures a heart rate, which is the number of heartbeats of a living body detected by the detecting unit per unit time, and a posture in which the living body is in a supine posture. Whether or not the living body has fallen asleep based on the posture information and the heart rate, and an acceleration sensor that obtains posture information indicating whether the posture is prone, prone, or not lying on its back Determining means for determining, when the determining means determines that the living body has fallen asleep, determining means for determining the quality of sleep of the living body from a change in the heart rate with respect to an elapsed time from the time of the determination. It is characterized by comprising.
Thereby, compared with the case where a pulse wave and a pulse interval are used, the quality of sleep can be evaluated by a simple method.

Preferably, the acceleration sensor further acquires body movement amount information of the living body, and the determination unit satisfies a predetermined condition of the posture of the living body indicated by the posture information, and includes the body movement amount information of the living body. It may be determined that the living body has fallen asleep when the amount of body movement shown is less than a threshold.
Thereby, compared with the case where it is determined whether or not the living body has fallen asleep without using the change in the body movement amount of the living body, the determination can be performed accurately.

Preferably, the determination unit is configured such that when the posture of the living body indicated by the posture information satisfies a predetermined condition and the heart rate measured by the measuring unit is less than a threshold, It is good to determine that you have fallen asleep.
This makes it possible to accurately determine whether or not the living body has fallen asleep without using a change in the heart rate of the living body.

The sleep evaluation apparatus according to the present invention includes a measuring unit that measures a heart rate that is the number of heartbeats of the living body detected by the detecting unit per unit time, an acceleration sensor that acquires posture information of the living body, Based on posture information and the heart rate, a determination unit that determines whether or not the living body has fallen asleep, a calculation unit that calculates a moving average of the heart rate measured by the measurement unit, and the determination unit And determining means for determining the quality of sleep of the living body from a change in the moving average of the heart rate calculated by the calculating means when it is determined that the person has fallen asleep.
Thereby, the influence of the sudden change of heart rate can be suppressed.

Preferably, the determination unit obtains a correspondence table in which the quality of sleep and the change pattern of the pulse rate of the living body that is sleeping are associated and recorded, and the correspondence table recorded in the obtained correspondence table The quality of sleep of the living body may be determined by comparing the change pattern with the change pattern of the pulse rate measured by the measuring means.
Thereby, compared with the case where a correspondence table is not used, the quality of sleep can be determined correctly.

Preferably, the discriminating means is such that the posture of the living body indicated by the posture information is in a supine or prone state for a predetermined time, and the heart rate measured by the measuring means is less than a threshold value. It may be determined that the living body has fallen asleep.
Preferably, when the posture of the living body indicated by the posture information is not in a supine or prone state, and the heart rate measured by the measuring unit is less than a threshold, the determining unit It is good to determine that they are not.
Preferably, the supine posture is a posture in which the living body faces the body within a range of ± 10 degrees upward in the gravity direction, and the prone posture is a position in which the living body is lowered in the gravity direction. It is preferable that the body is oriented within a range of ± 10 degrees toward the head.
Preferably, the determination means may determine the quality of sleep of the living body based on the increase / decrease period of the heart rate.
Preferably, the determination unit determines that the sleep state of the living body has shifted to the first state when the rate of change of the heart rate is equal to or greater than a first threshold, and the rate of change of the heart rate. Is not less than the second threshold and less than the first threshold, it is determined that the sleep state of the living body is maintained, and when the rate of change of the heart rate is less than the second threshold, It is determined that the sleep state has transitioned to the second state, and the quality of sleep of the living body is determined based on the number of transitions that are the number of transitions of the living state of the living body and the time during which each state is maintained. It is good to judge.
Moreover, the sleep evaluation system according to the present invention is characterized by comprising detection means for detecting a heart rate of a living body and the sleep evaluation apparatus described above.
Thereby, compared with the case where a pulse wave and a pulse interval are used, the quality of sleep can be evaluated by a simple method.

In addition, the program according to the present invention relates to the posture information transmitted from the acceleration sensor that detects posture information indicating whether the living body is in a supine posture, a prone posture, or a posture that is supine and not prone. Whether the living body has fallen asleep based on the posture information and the heart rate, the measuring means for measuring the heart rate that is the number of heart beats of the living body detected by the detecting means per unit time And a determination means for determining the quality of sleep of the living body from a change in the heart rate with respect to an elapsed time from the time of the determination when the determination means determines that the living body has fallen asleep. It is a program to make it function.
With this program, it is possible to evaluate the quality of sleep by a simple method compared to the case of using a pulse wave or a pulse interval.

It is a figure showing the outline of the sleep evaluation system concerning the embodiment of the present invention. It is a figure which shows the functional structure of a sleep evaluation apparatus. It is a figure which shows an example of a sleep state table | surface. It is a graph which shows the evaluation operation example at the time of high quality sleep. It is a graph which shows the evaluation operation example at the time of low quality sleep.

1. Configuration 1-1. Overall Configuration of Sleep Evaluation System FIG. 1 is a diagram showing an outline of a sleep evaluation system 9 according to an embodiment of the present invention. The sleep evaluation system 9 is a system including the sleep evaluation device 1, the acceleration sensor 2, and the photoelectric sensor 3. The sleep evaluation system 9 is a system for evaluating the quality of sleep of a living body based on the pulse rate of the living body. Here, the living body is a living body that can measure a pulse or a heartbeat, and is an object to be evaluated for sleep quality. The human body (human body) is an example of a living body. Hereinafter, a human user's body will be described as an example of an evaluation target.

  The quality of sleep is an index indicating how much the brain and body can rest due to the sleep, which leads to recovery from fatigue. The healthier the living body, the higher the quality of sleep. The quality of sleep is determined by parameters such as the appearance pattern of REM sleep and non-REM sleep and the duration of each.

Both the acceleration sensor 2 and the photoelectric sensor 3 are connected to the sleep evaluation device 1 and transmit the detected contents to the sleep evaluation device 1.
The acceleration sensor 2 is a capacitance type sensor, a piezoresistive type sensor, or the like, and detects the moving direction of the sensor and the direction of the sensor mounting part by measuring acceleration in three axis directions. The acceleration sensor 2 is attached to a body part such as a waist or a chest, which is a part of a human body, by a band, for example, and moves according to the movement of the part. Therefore, the information output from the acceleration sensor 2 can acquire information on the posture such as whether the user wearing the acceleration sensor 2 is lying on his back or lying down, and how much the user moves the body. Information on the amount of body movement shown can be acquired.

  The photoelectric sensor 3 is a sensor that detects the pulse of a living body. That is, the photoelectric sensor 3 is an example of a detection unit that detects a heartbeat of a living body. Specifically, the photoelectric sensor 3 includes a light emitting diode, a photodiode, and a converter. Blood hemoglobin has a strong absorption spectrum for light in a certain wavelength band, and the light-emitting diode of the photoelectric sensor 3 irradiates light in this wavelength band toward the blood vessels of the human body. Therefore, the transmitted light and reflected light of the light emitted from the light emitting diodes change in accordance with the blood hemoglobin amount that changes as the blood vessel capacity changes. The photodiode of the photoelectric sensor 3 is a light receiving element that converts light into an electrical signal. The photodiode receives the above-described transmitted light and reflected light, and outputs an analog signal that changes in accordance with the amount of the received light. The converter converts an analog signal indicating the amount of light into a digital signal. The photoelectric sensor 3 is attached to a user's finger etc., for example.

1-2. Configuration of Sleep Evaluation Device The control unit 11 is driven by receiving power from a power source (not shown). The control unit 11 is a control unit including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a timer, and the like, and is a computer program (hereinafter referred to as “ROM”) stored in the ROM or the storage unit 12. Each unit of the sleep evaluation device 1 is controlled by reading out and executing a program) on the RAM. The RAM is used as a work area when the CPU of the control unit 11 executes a program. The timer includes an oscillation circuit having a crystal resonator, measures time based on an oscillation signal output from the oscillation circuit, and calculates the current time. The control unit 11 functions as a detection unit 111, a determination unit 112, a measurement unit 113, a preprocessing unit 114, and a determination unit 115, which will be described later, by executing a program.

The communication unit 15 is a communication interface that exchanges information between the acceleration sensor 2 and the photoelectric sensor 3 by wired communication or wireless communication.
The storage unit 12 is a large-capacity storage unit such as an EEPROM (Electrically Erasable Programmable Read Only Memory) or a hard disk drive, and stores a program read by the control unit 11. The storage unit 12 stores a sleep state table 121 describing the relationship between the sleep state specified by measuring brain waves in advance and the rate of change of the user's pulse rate in that state.
The operation unit 13 includes operation buttons and the like for inputting various instructions. The operation unit 13 receives an operation by a user and supplies a signal corresponding to the operation content to the control unit 11.
The display unit 14 includes, for example, a display body such as a liquid crystal display, and displays a sleep evaluation result in accordance with an instruction from the control unit 11.

1-3. Functional Configuration of Sleep Evaluation Device FIG. 2 is a diagram illustrating a functional configuration of the sleep evaluation device 1. When detecting each piece of information on “posture” and “body movement amount” transmitted from the acceleration sensor 2, the detection unit 111 interprets these pieces of information and detects the posture angle and the body movement amount. For example, the detection unit 111 detects that the user who has attached the acceleration sensor 2 points the body in a range of ± 10 degrees upward in the direction of gravity, and detects that the user is in a supine posture. Identify. Moreover, the detection part 111 specifies that the body movement amount per minute of a user is 5 cm (centimeter). The posture angle and the amount of body movement detected by the detection unit 111 are transmitted to the determination unit 112.

  Note that the supine posture means that the user points the body within a range of ± 10 degrees upward in the direction of gravity, and the prone posture means that the user is ± 10 downwards in the direction of gravity. The body is oriented within the range of degrees. For example, if the torso is directed to a range of more than +10 degrees and less than +80 degrees from above, the user is in a state of lying on his back and not lying down.

The measurement unit 113 measures the pulse rate of the user based on the digital signal transmitted from the photoelectric sensor 3 attached to the user's finger or the like. The pulse rate is the number of pulses engraved per minute by the user's pulse to be evaluated. Since the pulse fluctuates in synchronization with the heart rate, the pulse rate can be measured as a substitute for the heart rate. That is, the measurement unit 113 functions as a measurement unit that measures a heart rate that is the number of heartbeats of the living body detected by the detection unit. Specifically, the measurement unit 113 measures the pulse once when the differential value of the light amount indicated by the digital signal exceeds a certain threshold value. And the measurement part 113 quadruples the frequency | count of the pulse measured in 15 seconds (4 = 60 second / 15 second), and outputs it as the pulse rate per minute. The user's pulse rate measured by the measurement unit 113 is transmitted to the determination unit 112 and the preprocessing unit 114.
The photoelectric sensor 3 and the measurement unit 113 constitute a pulse measurement unit U2 that measures the user's pulse rate.

  For example, the determination unit 112 determines whether or not the user who is the object of evaluation has fallen asleep by applying the following rule.

Rule 1: If the user's posture is supine or prone for a predetermined time, the amount of body movement is less than the threshold value, and the pulse rate is less than the threshold value, the user is sleeping.
Rule 2: When the user's posture is not supine or lying down, the amount of movement is less than the threshold value, and the pulse rate is less than the threshold value, the user is in a nap state.

And when it determines with having fallen asleep, the control part 11 memorize | stores the pulse rate measured corresponding to the elapsed time from the time.
That is, the determination unit 112 functions as a determination unit that determines whether or not the living body has fallen asleep. In addition, the determination unit 112 functions as a determination unit that determines that the living body has fallen asleep when the body movement amount detected by the detection unit that detects the body movement amount of the living body is less than a threshold value. The determination unit 112 functions as a determination unit that determines that the living body has fallen asleep when the heart rate measured by the measurement unit is less than a threshold value.
The acceleration sensor 2, the detection unit 111, and the determination unit 112 constitute a sleep onset determination unit U1 that determines whether the user has fallen asleep.

  When the determination unit 112 determines that the user has fallen asleep, the preprocessing unit 114 performs a calculation corresponding to the preprocessing based on the user's pulse rate transmitted from the measurement unit 113. For example, the preprocessing unit 114 calculates a moving average of the transmitted pulse rate as the preprocessing. Here, calculating the moving average of numerical values at a certain time means calculating the average of each numerical value in a certain fixed period most recently until that time. That is, the preprocessing unit 114 functions as a calculation unit that calculates a moving average of the heart rate measured by the measurement unit.

  Specifically, the pre-processing unit 114 totals the pulse rate measured every 15 seconds described above for 20 times, takes an arithmetic average, and outputs it as a moving average. That is, the average of the pulse rate over the last 5 minutes is obtained. As a result, sudden fluctuations caused by reasons such as sampling error and rounding error are averaged in the pulse rate measured every 15 seconds. The moving average of the pulse rate calculated by the preprocessing unit 114 is transmitted to the determination unit 115.

  The determination unit 115 stores at least two continuous averages of the moving averages transmitted from the preprocessing unit 114 in the RAM, and calculates the rate of change of the pulse rate from these differences. For example, if the difference between the moving average of a pulse rate at a certain time and the moving average after a certain period of time has been divided by that certain period, the rate of change of the pulse rate in that certain period can be obtained. . If this fixed period is made as short as 15 seconds, which is the pulse rate measurement interval, for example, this rate of change can be used as an approximation of the derivative in the time function of the pulse rate.

The determination unit 115 refers to the change rate of the pulse rate described in the sleep state table 121 stored in the storage unit 12 and specifies the sleep state corresponding to the calculated change rate. The identified sleep state is evaluated based on the rules stored in advance in the storage unit 12, and the number of appearances and intervals thereof are evaluated, and these are combined to determine the quality of sleep. A determination result (evaluation) about the quality of sleep is stored in the storage unit 12 and displayed on the display unit 14. That is, the determination unit 115 functions as a determination unit that determines the quality of sleep of the living body from the change in the moving average of the heart rate calculated by the calculation unit when the determination unit determines that the living body has fallen asleep. Further, the determination unit 115 acquires a correspondence table in which the quality of sleep and the change pattern of the heart rate of the living body that is sleeping are recorded in association with each other, and the change pattern recorded in the acquired correspondence table It functions as a determination unit that compares the heart rate change pattern measured by the measurement unit and determines the sleep quality of the living body.
The preprocessing unit 114 and the determination unit 115 constitute a sleep evaluation unit U3 that evaluates the quality of sleep of the user.

1-4. Configuration of Sleep State Table The sleep state table 121 stored in the storage unit 12 will be described.
FIG. 3 is a diagram illustrating an example of the sleep state table 121. In the sleep state table 121, a pulse rate change speed field and a sleep state field are associated with each other. The rate of change of the pulse rate is a numerical value indicating the rate at which the pulse rate changes with time, and is an example of a numerical value representing a pattern in which the pulse rate changes. That is, the sleep state table 121 is an example of a correspondence table that records the quality of sleep and the change pattern of the heart rate of the living body that is sleeping.

  For example, according to the sleep state table 121 shown in the figure, when the rate of change of the pulse rate is 1.2 times / minute or more, the user's sleep state is “REM sleep transition”. That is, when the rate of change of the pulse rate increases by 1.2 times or more per minute, it indicates that the user has shifted to REM sleep. On the other hand, when the rate of change of the pulse rate is −0.1 times / minute or more and less than 1.2 times / minute, the user's sleep state is “state continuation”. Indicates that it is continuing. When the rate of change of the pulse rate becomes less than −0.1 times / minute, the user's pulse rate decreases, and the sleep state becomes “non-REM sleep transition”. In other words, the user shifts to non-REM sleep.

2. Example of operation 2-1. FIG. 4 is a graph showing an example of an evaluation operation during high-quality sleep. The horizontal axis of this graph represents “sleep time”, which is the elapsed time since the user fell asleep, in minutes. The vertical axis of this graph represents the user's pulse rate measured by the measurement unit 113. In the same figure, four arrow lines represent the time point when the sleep state “REM sleep transition” appears. In this case, the user has shifted to REM sleep four times during a sleep time of 400 minutes, and the interval is gradually shortened, or the time of one REM sleep and non-REM sleep is 60, for example. Since there are more than minutes, it is evaluated that high quality sleep is obtained. This evaluation rule is set in advance in the storage unit 12 or the ROM of the control unit 11.

2-2. On the other hand, FIG. 5 is a graph showing an example of evaluation operation during sleep of low quality. The vertical and horizontal axes in FIG. 5 are the same as those in FIG. In the same figure, seven arrow lines represent the time point when the sleep state “REM sleep transition” appears. In this case, the user has transitioned to REM sleep 7 times during the sleep time of 400 minutes, and these intervals are short and there is no regularity that gradually decreases. Therefore, it can be seen that the sleep in FIG. 5 is lower in quality than the sleep in FIG.

  Although not shown, for example, even if the total number of transitions to REM sleep and the total time of the REM sleep state are the same as those in FIG. 4, the appearance interval of the sleep state in REM sleep transition is the same as that in FIG. On the contrary, when it becomes long gradually, it is evaluated as low quality sleep in the above-described evaluation rule.

  As described above, according to the sleep evaluation system 9, the deep sleep state (non-REM sleep) and the shallow sleep state (REM sleep) can be determined based on the cycle of increase / decrease of the pulse rate, and this cycle. It is possible to evaluate the quality of sleep by comparing whether each of the sleep states is repeated correctly or whether each sleep state has enough time or the like with a threshold value determined for each.

  When acquiring an autonomic nerve index by measuring pulse intervals, a series of pulse wave interval data is converted into a frequency spectrum distribution, and a low frequency region and a high frequency obtained from the series of pulse wave interval data converted into a frequency spectrum distribution are converted. It was necessary to determine the value of the power spectrum in the frequency domain. For this reason, compared to simply measuring the number of pulses per minute, the amount of data to be accumulated is large and the calculation is complicated. As described above, according to the sleep evaluation system 9, it is not necessary to measure the pulse interval, and it is possible to evaluate the quality of sleep only by measuring a simpler pulse rate.

3. Modification The above is the description of the embodiment, but the contents of this embodiment can be modified as follows. Further, the following modifications may be combined.

(1) In the above-described embodiment, the preprocessing unit 114 realized by the control unit 11 of the sleep evaluation apparatus 1 calculates the moving average of the pulse rate, and the determination unit 115 is the moving average transmitted from the preprocessing unit 114. Based on the above, the change rate of the pulse rate was obtained and the sleep state corresponding to this was specified, but the determination unit 115 obtains the change rate of the measured pulse rate itself, not the moving average of the pulse rate, You may specify the sleep state corresponding to this. The reason why the moving average is calculated is to eliminate sudden fluctuations due to sampling error, rounding error, and the like. If the pulse is stable, it may not be necessary to calculate the moving average. In short, when the determination unit 115 determines that the living body has fallen asleep, the determination unit 115 stores the heart rate measured by the measurement unit in association with the elapsed time from the determination time, and the heart rate with respect to the elapsed time. What is necessary is just to function as a determination means which determines the quality of sleep of the said biological body from the change of this.

  By the way, in this case, when the measurement unit 113 quadruples the number of pulses measured for 15 seconds as described above and outputs the number of pulses per minute, the accuracy of the pulse rate obtained by one measurement is an integer. Therefore, sufficient accuracy may not be obtained. Therefore, the measuring unit 113 may calculate the time rate by calculating the time interval from the previous pulse for each pulse, for example. Specifically, the measurement unit 113 specifies the timing at which the blood vessel capacity begins to increase as one pulsation. If the next pulsation is detected after 0.912 seconds from the reference time 0 second, which is the time at which the pulsation was detected, the measurement unit 113 sets the pulse rate at the time of 0.912 seconds to 65.60. It is measured as 79 (= 60 / 0.912). If the next pulsation is detected after 0.895 seconds from 0.912 seconds, that is, after 1.807 seconds from the reference time, the measurement unit 113 detects the time at 1.807 seconds. The pulse rate is measured as 67.04 (= 60 / 0.895). Thus, the measurement accuracy of the pulse rate can be increased by using one pulse interval.

  Even in this case, since the process of converting the accumulated data into the frequency spectrum distribution is not performed, the sleep evaluation system 9 has a simple configuration as compared with the pulse interval measurement. Further, instead of measuring the pulse rate every time a single pulsation is detected, the pulse rate may be measured from the time between them when multiple pulsations are detected. Moreover, the determination part 115 may calculate a moving average about the pulse rate measured by this, and may determine the quality of sleep from the change of the moving average.

(2) In the above-described embodiment, the determination unit 112 determines that the user has fallen asleep when the amount of body motion is less than the threshold value and the pulse rate is less than the threshold value. It may be determined that the user has fallen asleep when one of these is less than the threshold value associated with each. Further, when the user performs a predetermined operation using the operation unit 13 of the sleep evaluation device 1, the determination unit 112 may determine that the user has fallen asleep. In short, the determination unit 112 may function as a determination unit that determines whether or not a living body has fallen asleep.

(3) In the above-described embodiment, the sleep state table 121 describes the change rate of the pulse rate as a numerical value representing the pattern in which the pulse rate changes. However, the change rate of the pulse rate is limited to the change rate. I can't. For example, it may be a pulse rate change acceleration. The change rate acceleration of the pulse rate is the change rate of the change rate and corresponds to the second derivative in the time function of the pulse rate. Thus, for example, even if the rate of change is a positive value, if the pulse rate suddenly rises first and then the degree of increase gradually decreases, the change acceleration corresponding to the second derivative Is a negative value. On the other hand, similarly, even if the change rate is a positive value, the change acceleration is a positive value when the rate of increase increases as the pulse increases. In this way, the change pattern may be represented by acceleration and other analysis values in addition to the speed.

(4) In the above-described embodiment, the storage unit 12 stores the sleep state table 121 that describes the relationship between the sleep state specified by measuring brain waves in advance and the rate of change of the user's pulse rate in that state. I remembered it. Thereby, although the influence of the individual difference regarding the relationship between the pulse rate and the electroencephalogram was suppressed, the storage unit 12 is not the sleep state table 121 that stores the parameters of the user to be evaluated, but other users or samples in advance. A correspondence table describing parameters measured for the measured population may be stored. Also, a plurality of types of correspondence tables may be prepared according to attributes such as age and sex. In this case, one correspondence table may be selected according to the attribute of the user to be evaluated from the correspondence table of the sub-number type.

(5) In the above-described embodiment, the program executed by the control unit 11 of the sleep evaluation apparatus 1 is a magnetic recording medium such as a magnetic tape or a magnetic disk, an optical recording medium such as an optical disk, a magneto-optical recording medium, a semiconductor memory, or the like. It can be provided in a state of being stored in a recording medium readable by a computer device. It is also possible to download this program via a network such as the Internet. Various devices other than the CPU can be applied as the control means exemplified by the control unit 11. For example, a dedicated processor or the like may be used.

(6) In the above-described embodiment, the measurement unit 113 measures the user's pulse rate as a substitute for the heart rate, but may directly measure the user's heart rate. For example, the heart rate is measured using an electrocardiographic sensor that detects an electrical signal of the heart.

DESCRIPTION OF SYMBOLS 1 ... Sleep evaluation apparatus, 11 ... Control part, 111 ... Detection part, 112 ... Discrimination part, 113 ... Measurement part, 114 ... Pre-processing part, 115 ... Determination part, 12 ... Memory | storage part, 121 ... Sleep state table, 13 ... Operation unit, 14 ... display unit, 15 ... communication unit, 2 ... acceleration sensor, 3 ... photoelectric sensor, 9 ... sleep evaluation system, U1 ... sleep detection unit, U2 ... pulse measurement unit, U3 ... sleep evaluation unit

To solve the problems described above, the sleep evaluation device according to the present invention, the attitude information acquisition for acquiring the pulse information obtaining means for obtaining the pulse information indicating the figures for pulse raw body, the posture information indicating the posture of the body A determination means for determining whether or not the living body has fallen asleep based on the means, the pulse information and the posture information; and when the determination means determines that the living body has fallen asleep, Determining means for determining the quality of sleep of the living body from the change in the pulse information with respect to the elapsed time from the time point.
Thereby, compared with the case where a pulse wave and a pulse interval are used, the quality of sleep can be evaluated by a simple method.

Preferably, the pulse information may include a pulse rate of the living body.
Preferably, the pulse information includes a change acceleration of the pulse rate of the living body.
Preferably, the pulse information includes a second derivative value of a time change of the pulse rate of the living body.
Thereby, the influence of the sudden change of a pulse rate can be suppressed.
Preferably, the posture information includes information indicating that the living body is one of a posture of lying on its back, a posture of lying down, and a posture of lying on its back.
In a preferred embodiment, the orientation obtaining unit, Tokushi preparative body motion information indicating the motion amount of the subject, the determination means, the posture of the living body which the posture information indicating satisfies a predetermined condition, said body It may be determined that the living body has fallen asleep when the amount of body movement of the living body indicated by the movement information is less than a predetermined threshold.
Thereby, compared with the case where it is determined whether or not the living body has fallen asleep without using the change in the body movement amount of the living body, the determination can be performed accurately.

Preferably, the determination unit determines that the living body has fallen asleep when the posture of the living body indicated by the posture information satisfies a predetermined condition and the numerical value indicated by the pulse information is less than a predetermined threshold. Good.
This makes it possible to accurately determine whether or not the living body has fallen asleep without using a change in the heart rate of the living body.

Also preferably, the determination unit acquires a correspondence table recorded in association with the change pattern of the pulse information of the living body that the quality and the sleep of sleep of the subject, recorded in those said correspondence table The quality of sleep of the living body may be determined by comparing the changed pattern and the change pattern of the pulse information measured by the pulse information acquisition unit.
Thereby, compared with the case where a correspondence table is not used, the quality of sleep can be determined correctly.

Preferably, the determination means is when the posture of the living body indicated by the posture information is in a supine or prone state over a predetermined time and the numerical value indicated by the pulse information is less than a predetermined threshold value. It may be determined that the living body has fallen asleep.
Preferably, the determination unit is in a state where the posture of the living body indicated by the posture information is not in a supine or prone state, and when the numerical value indicated by the pulse information is less than a predetermined threshold, It is good to determine that they are not.
Preferably, the supine posture is a posture in which the living body faces the body within a range of ± 10 degrees upward in the gravity direction, and the prone posture is a position in which the living body is lowered in the gravity direction. It is preferable that the body is oriented within a range of ± 10 degrees toward the head.
Preferably, the determination means may determine the quality of sleep of the living body based on a fluctuation period of the pulse information .
Preferably, said determining means, said determining the rate of change of pulse information is sleeping state of the subject if the first threshold or more are shifted to the first state, the rate of change of the pulse information Is greater than or equal to the second threshold and less than the first threshold, it is determined that the sleep state of the living body is maintained, and when the rate of change of the pulse information is less than the second threshold, It is determined that the sleep state has transitioned to the second state, and the quality of sleep of the living body is determined based on the number of transitions that are the number of transitions of the living state of the living body and the time during which each state is maintained. It is good to judge.
This ensures, in a simple manner as compared with the case of using a pulse or pulse interval, it is possible to evaluate the quality of sleep.

The program according to the present invention, the computer over, and pulse information obtaining means for obtaining the pulse information of the raw body, the attitude information acquisition means for acquiring orientation information of the living body, and the pulse information and the posture information and based on the, when a determination means for the living body is determined whether or not was input Nemushi, that the biological by the discriminating means is determined that there was input Nemushi, the change in the pulse information for the time elapsed from the time of the determination The program for functioning as a determination means for determining the quality of sleep of the living body.
With this program, it is possible to evaluate the quality of sleep by a simple method compared to the case of using a pulse wave or a pulse interval.

Claims (7)

Measuring means for measuring the heart rate of the living body detected by the detecting means;
Determining means for determining whether or not the living body has fallen asleep;
When the determination means determines that the living body has fallen asleep, the heart rate measured by the measurement means is stored in association with the elapsed time from the determination time, and the heart rate relative to the elapsed time is stored. A sleep evaluation apparatus comprising: a determination unit that determines the quality of sleep of the living body from a change. The sleep evaluation according to claim 1, wherein the determination unit determines that the living body has fallen asleep when the body movement amount detected by the detection unit that detects the body movement amount of the living body is less than a threshold value. apparatus. The sleep evaluation apparatus according to claim 1, wherein the determination unit determines that the living body has fallen asleep when the heart rate measured by the measurement unit is less than a threshold value. Comprising calculating means for calculating a moving average of the heart rate measured by the measuring means;
The determining means determines the quality of sleep of the living body from a change in the moving average of the heart rate calculated by the calculating means when the determining means determines that the living body has fallen asleep. The sleep evaluation apparatus according to any one of claims 1 to 3. The determination means acquires a correspondence table in which sleep quality and a change pattern of a heart rate of a living body that is sleeping are associated and recorded, and the change pattern and the measurement recorded in the acquired correspondence table The sleep evaluation apparatus according to any one of claims 1 to 4, wherein the sleep quality of the living body is determined by comparing with a change pattern of the heart rate measured by the means. Detection means for detecting a heart rate of a living body;
A sleep evaluation system comprising: the sleep evaluation device according to claim 1. Computer
Measuring means for measuring the heart rate of the living body detected by the detecting means;
Determining means for determining whether or not the living body has fallen asleep;
A program for functioning as a determination unit that determines the quality of sleep of the living body from a change in heart rate measured by the measurement unit when the determination unit determines that the living body has fallen asleep.

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