JP7448172B1 - Heat stroke determination device, heat stroke determination method and program - Google Patents

Abstract

The heat stroke determination device 1 includes a heart rate identification unit 153 that identifies the measured heart rate of the subject U, a temperature identification unit 154 that identifies the core body temperature of the subject U, and an estimated heart rate based on the core body temperature. When the relationship between the measured heart rate and the estimated heart rate satisfies the first condition, the calculation unit 155 outputs alert information indicating that heat stroke is suspected, and calculates the relationship between the measured heart rate and the estimated heart rate. and a determination unit 156 that does not output alert information if the relationship does not satisfy the first condition.

Description

The present invention relates to a heat stroke determining device, a heat stroke determining method, and a program.

Conventionally, a technique for determining whether or not a person is suffering from heat stroke based on core body temperature is known (for example, see Patent Document 1).

Japanese Patent Application Publication No. 2018-134137

Even if your core body temperature rises, if your autonomic nervous system is functioning normally, the risk of heatstroke is small. However, the conventional technology has a problem in that a heat stroke warning is issued when the core body temperature is equal to or higher than a threshold value, even though the risk of heat stroke is low.

Therefore, the present invention has been made in view of these points, and an object of the present invention is to improve the accuracy of determining heatstroke.

A heat stroke determination device according to a first aspect of the present invention includes: a heart rate specifying section that specifies an actual measured heart rate of a subject; a temperature specifying section that specifies a core body temperature of the subject; a calculation unit that calculates an estimated heart rate based on the measured heart rate, and outputs alert information indicating that heatstroke is suspected when the relationship between the measured heart rate and the estimated heart rate satisfies a first condition; and a determination unit that does not output the alert information when the relationship between the heart rate and the estimated heart rate does not satisfy the first condition.

The temperature specifying unit converts, as variables, the body surface temperature of the subject measured by a body temperature sensor and the temperature of the space measured by a temperature sensor provided in a space where the subject is present. The core body temperature may be specified based on a formula.

The calculation unit may calculate the estimated heart rate by multiplying the core body temperature by a predetermined coefficient.

The calculation unit may calculate the estimated heart rate by multiplying the core body temperature by the predetermined coefficient stored in the storage unit in association with the subject.

The calculating section calculates the minimum value of the estimated heart rate and the maximum value of the estimated heart rate, and the determining section calculates the actual measured heart rate between the minimum value of the estimated heart rate and the maximum value of the estimated heart rate. The alert information may be output when the first condition that the heart rate is not included is satisfied.

The heat stroke determination device further includes a spectrum identifying unit that identifies a frequency spectrum of a heart rate fluctuation amount, which is a fluctuation amount of the measured heart rate, based on the plurality of measured heart rates measured at different times, The determining unit is configured to determine that a ratio of a second component of the heart rate variation amount included in a second frequency band lower than the first frequency band to a first component of the heart rate variation amount included in the first frequency band is The alert information may be output when the second condition of being equal to or greater than a threshold is satisfied.

A heat stroke determination method according to a second aspect of the present invention includes a step of identifying an actually measured heart rate of a subject, a step of identifying a core body temperature of the subject, and a step of determining the core body temperature based on the core body temperature, which is executed by a computer. and a step of outputting alert information indicating that heatstroke is suspected when the relationship between the measured heart rate and the estimated heart rate satisfies a predetermined condition.

A program according to a third aspect of the present invention causes a computer to perform the steps of specifying a measured heart rate of a subject, specifying a core body temperature of the subject, and calculating an estimated heart rate based on the core body temperature. This is a program for executing the steps of calculating, and outputting alert information indicating that heatstroke is suspected when the relationship between the measured heart rate and the estimated heart rate satisfies a predetermined condition. .

According to the present invention, there is an effect that the accuracy of determining heatstroke is improved.

1 is a diagram for explaining an overview of a heatstroke determining device 1. FIG. 1 is a diagram showing the configuration of a heat stroke determining device 1. FIG. 2 is a flowchart showing the flow of processing in the heatstroke determining device 1. FIG. It is a figure which shows the structure of 1 A of heatstroke determination apparatuses based on a modification.

[Overview of heat stroke determination device 1]
FIG. 1 is a diagram for explaining the outline of a heat stroke determining device 1. As shown in FIG. The heat stroke determining device 1 is a device that determines whether or not the subject U is suffering from heat stroke. The heat stroke determining device 1 may be any device having a processor capable of performing arithmetic processing, such as a computer, a smartphone, or a dedicated device.

The heat stroke determination device 1 transmits and receives data to and from the information terminal 2 via an intranet or short-range wireless communication. For example, the heat stroke determining device 1 transmits the determination result of whether or not the person has heat stroke to the information terminal 2, and the information terminal 2 displays the determination result. The heat stroke determining device 1 may display the determination results on a display that the heat stroke determining device 1 has.

The heat stroke determination device 1 determines whether the relationship between the heart rate estimated based on the core body temperature of the subject U and the actually measured heart rate matches the relationship when there is a high probability of heat stroke. , it is determined whether or not the subject U is suffering from heat stroke. By operating the heat stroke determining device 1 in this manner, the heat stroke determining device 1 determines whether the heat stroke is due to heat stroke, for example, if the subject U exercises and the body temperature rises and the heart rate also increases. It can be determined that the increase in body temperature is caused by exercise rather than an increase in body temperature. On the other hand, if the core body temperature of the subject U has increased even though the heart rate has not increased, the heat stroke determination device 1 determines that there is a high probability that the body temperature has increased due to heat stroke. alert information can be output.

Although details will be described later, the heat stroke determination device 1 transmits a transmission wave TX, which is a high-frequency radio wave (for example, millimeter wave radar), toward the subject U, and receives a reflected wave RX reflected at the subject U. receive. The heat stroke determination device 1 measures the heart rate by analyzing the received reflected wave RX and identifying the period in which the heart of the subject U moves. High-frequency radio waves include, for example, chirp signals whose frequency changes over time. The heat stroke determination device 1 converts the reflected signal into the frequency domain by Fourier transform, identifies the frequency included in the reflected signal, and calculates the propagation time from transmitting the signal of the frequency to receiving the signal. The heart rate is measured based on the period of variation of the propagation time.
Hereinafter, the configuration and operation of the heat stroke determining device 1 will be explained in detail.

[Configuration of heat stroke determination device 1]
FIG. 2 is a diagram showing the configuration of the heat stroke determining device 1. As shown in FIG. The heat stroke determining device 1 includes a transmitting section 11 , a receiving section 12 , a communication section 13 , a storage section 14 , and a control section 15 . The control section 15 includes an instruction reception section 151 , a radio wave control section 152 , a heart rate identification section 153 , a temperature identification section 154 , a calculation section 155 , and a determination section 156 .

The transmitter 11 transmits a transmission signal in a frequency band equal to or higher than the millimeter wave band at predetermined time intervals under the control of the radio wave controller 152. The transmitter 11 transmits a chirp signal at a cycle of, for example, 12.5 milliseconds. The transmitter 11 includes a signal generation circuit that generates a chirp signal and an antenna that transmits a transmission signal as a radio wave. As an example, the heat stroke determining device 1 may include a plurality of transmitters 11 that transmit transmission signals to different ranges at different timings. In this case, the heat stroke determining device 1 can simultaneously determine whether each of the plurality of subjects U is suffering from heat stroke.

The transmitting unit 11 transmits a transmission signal at a time interval that is less than a half cycle of the minimum value of a preset cycle in which the biological state changes. For example, if the maximum heart rate is assumed to be 150 beats/minute, the minimum heart rate fluctuation period is 0.4 seconds. Therefore, the transmitter 11 transmits the transmission signal at time intervals of less than 0.2 seconds. The transmitter 11 transmits the transmission signals at such time intervals, so that the heat stroke determination device 1 determines the body parts of the person U based on the reflected signals received by the receiver 12 at the time intervals. It becomes possible to identify the state of change. Although the length of the transmission signal transmitted by the transmitter 11 is arbitrary, it is desirable that the length be sufficiently shorter than the time interval at which the transmission signal is transmitted, for example, within 2 milliseconds.

The receiving unit 12 receives a reflected signal generated when the transmitted signal is reflected by the person U to be measured. As an example, the receiving section 12 may include a plurality of receiving sections 12 each receiving reflected signals arriving from different ranges. The receiving unit 12 inputs the received reflected signal to the heart rate identifying unit 153.

The communication unit 13 has a communication interface for transmitting and receiving various data to and from the information terminal 2. The communication unit 13 has, for example, a Bluetooth (registered trademark) communication interface. The communication unit 13 receives data indicating the content of the user's operation input on the information terminal 2 . Furthermore, the communication unit 13 transmits the determination result output by the spectrum specifying unit 157 to the information terminal 2.

The communication unit 13 may receive data indicating the temperature from a measuring device that measures the body surface temperature of the subject U and the temperature of the space in which the subject U is present. The communication unit 13 inputs the received temperature data to the calculation unit 155.

The storage unit 14 includes storage media such as ROM (Read Only Memory) and RAM (Random Access Memory). The storage unit 14 stores programs executed by the control unit 15. The storage unit 14 also stores the reflected signal received by the receiving unit 12 and the heart rate calculated by the control unit 15 analyzing the reflected signal.

The control unit 15 includes, for example, a CPU (Central Processing Unit). By executing the program stored in the storage unit 14, the control unit 15 controls the instruction receiving unit 151, the radio wave control unit 152, the heart rate identification unit 153, the temperature identification unit 154, the calculation unit 155, the determination unit 156, and the spectrum identification unit. 157.

The instruction receiving unit 151 receives instruction data input from the information terminal 2 via the communication unit 13. The instruction receiving unit 151 receives, for example, an instruction to start checking whether or not the person has heatstroke. The instruction receiving unit 151 may receive an instruction to set attributes such as the age, gender, and weight of the subject U.

The radio wave control section 152 controls the transmitting section 11 and the receiving section 12. The radio wave control unit 152 controls, for example, the timing at which the transmitting unit 11 transmits a transmission signal. Furthermore, the radio wave control unit 152 controls the range in which the transmitting unit 11 transmits the transmission signal and the range in which the receiving unit 12 receives the reflected signal.

The heart rate identifying unit 153 identifies the measured heart rate of the subject U. Specifically, the heart rate identifying unit 153 identifies, based on the reflected waves received by the receiving unit 12, the period of variation in the distance between the heatstroke determining device 1 and the part to which the signal transmitted by the transmitting unit 11 is reflected. By this, the heart rate of the subject U is specified.

The heart rate identifying unit 153 converts the reflected signal received by the receiving unit 12 into a frequency domain signal by Fourier transforming the reflected signal, for example. The heart rate identifying unit 153 identifies the frequency component included in the chirp signal that constitutes the reflected signal in the frequency domain, and determines the time when the transmitting unit 11 transmitted the frequency component and the frequency component included in the reflected signal. The difference between the time when the receiving unit 12 receives the frequency component and the time when the receiving unit 12 receives the frequency component is specified as the propagation time.

The heat stroke determination device 1 identifies the distance to the part where the radio waves are reflected based on the propagation time. When the heatstroke determining device 1 determines that the change in distance over time is due to the heartbeat, the heatstroke determining device 1 calculates the heart rate based on the cycle of the change. The heat stroke determination device 1 determines the distance when the cycle of the change in distance is within the range expected as the cycle of a heartbeat and the amplitude of the change in distance is large enough to correspond to the amount of variation on the surface of the heart. The heart rate is calculated based on the period of change in . The heart rate specifying unit 153 notifies the temperature specifying unit 154 of the calculated heart rate in association with time.

The temperature specifying unit 154 specifies the deep body temperature of the subject U based on the body surface temperature of the subject U and the temperature of the space in which the subject U is present. The temperature identification unit 154 uses a conversion formula that uses as variables the body surface temperature of the subject U measured by the body temperature sensor and the temperature of the space measured by a temperature sensor provided in the space where the subject U is present. Determine core body temperature based on

The temperature specifying unit 154 acquires, for example, body surface temperature data indicating the distribution of the body surface temperature of the subject U measured by a thermograph, and spatial temperature data indicating the spatial temperature measured by a thermometer. The temperature specifying unit 154 sets the highest temperature of the body surface temperatures of the plurality of positions included in the body surface temperature data as the body surface temperature of the subject U.

The body surface temperature measured by a temperature measuring device such as a thermography device has an error due to the temperature around the temperature measuring device. Therefore, the temperature specifying unit 154 corrects the body surface temperature based on the spatial temperature data. Specifically, when the body surface temperature is Ts, the space temperature is Ta, and the corrected body surface temperature is Tsh, the temperature specifying unit 154 corrects the body surface temperature using the following equation, for example.
Tsh=Ts+a1×Ta ² +b1×Ta−c1
Here, a1, b1, and c1 are coefficients.

Subsequently, the temperature specifying unit 154 specifies the core body temperature Td based on the corrected body surface temperature Tsh, for example, using the following equation. The temperature specifying unit 154 inputs the specified core body temperature to the calculating unit 155.
Td=a2×Tsh ³ -b2×Tsh ² +c2×Tsh−d
Here, a2, b2, c2, and d are coefficients.

The calculation unit 155 calculates the estimated heart rate based on the core body temperature of the subject U specified by the temperature identification unit 154. It is known that there is a correlation between core body temperature and heart rate, and calculation unit 155 calculates the estimated heart rate by multiplying core body temperature by a predetermined coefficient corresponding to the correlation. The calculation unit 155 may calculate the estimated heart rate by multiplying the core body temperature by a predetermined coefficient stored in the storage unit 14 in association with the subject U or an attribute of the subject U. The calculation unit 155 calculates the minimum value and maximum value of the estimated heart rate using the following equations, based on the assumption that the heart rate increases by 10 when the core body temperature increases by 0.55° C., for example.

BT-Th=ΔBT
ΔHR=(ΔBT÷0.55)×10
HRE _min =HR _min +ΔHR
HRE _max =HR _max +ΔHR
Here, BT is core body temperature, Th is standard core body temperature (e.g. 36.5°C), ΔBT is the difference between core body temperature and standard core body temperature, ΔHR is the estimated difference from standard heart rate, and HR _min is The minimum value of the standard heart rate, HR _max is the maximum value of the standard heart rate, HRE _min is the minimum value of the estimated heart rate, and HRE _max is the maximum value of the estimated heart rate.

HR _min and HR _max are, for example, the minimum and maximum values of the heart rate measured when the subject U is in a healthy resting state. HR _min and HR _max may be stored in advance in the storage unit 14 or may be set by the information terminal 2. The storage unit 14 stores a plurality of HR _min and HR _max in association with the attributes of the person, and the calculation unit 155 may use the HR _min and HR _max corresponding to the attributes of the subject U.

The determining unit 156 determines whether or not the subject U has a high probability of suffering from heatstroke, based on the relationship between the measured heart rate and the estimated heart rate. The determination unit 156 outputs alert information indicating that heat stroke is suspected when the relationship between the measured heart rate and the estimated heart rate satisfies the first condition, and determines that the relationship between the measured heart rate and the estimated heart rate is Alert information is not output when the first condition is not met. The first condition is, for example, that the measured heart rate is not included between the minimum value and the maximum value of the estimated heart rate.

For example, when HR _min is 60 and HR _max is 85, the determination unit 156 determines that in the following cases, the relationship between the fever state and heart rate of subject U is abnormal, and there is a high probability of heat stroke. It is determined that
Actual heart rate <60+ΔHR or 85+ΔHR<actual heart rate On the other hand, in the following cases, the determining unit 156 determines that the relationship between the fever state and the heart rate of the subject U is normal and the probability of heat stroke is low.
60+ΔHR≦Actual heart rate≦85+ΔHR

In this way, the determination unit 156 determines whether or not there is a high probability that the subject U is suffering from heat stroke based on the relationship between the measured heart rate and the estimated heart rate based on the core body temperature. It is possible to reduce the probability that a heatstroke warning will be issued when the core body temperature is above a threshold value, even though the probability of developing the disease is low.

In addition, in the above description, it is assumed that the body surface temperature is measured correctly, but in reality, the body surface temperature may not be measured correctly. In such a case, if it is determined whether there is a high probability that subject U has heatstroke based on the relationship between the measured heart rate and the estimated heart rate based on core body temperature, an incorrect determination will be made. There is a risk. Therefore, the determining unit 156 determines whether the reliability of the measured body surface temperature is high or not, and if the reliability of the measured body surface temperature is equal to or higher than the threshold and the estimated heart rate based on the core body temperature is high. If the relationship satisfies the first condition, it may be determined that the probability of heatstroke is high.

For example, the determination unit 156 determines that the reliability of the body surface temperature is less than the threshold in any of the following cases.
(1) When the maximum temperature indicated by the data obtained from thermography is outside the rated range (2) When the area of the highest temperature region in the temperature image obtained from thermography is less than the threshold (3) When the measured body surface temperature (4) When the heart rate identification unit 153 does not detect a heartbeat (when it does not detect a person)

[Flow of processing in heat stroke determination device 1]
FIG. 3 is a flowchart showing the flow of processing in the heatstroke determining device 1. The flowchart shown in FIG. 3 starts from the time when the heatstroke determining device 1 starts transmitting radio waves for measuring the heart rate to the subject U. When the heat stroke determining device 1 determines whether each of the plurality of subjects U has heat stroke, the heat stroke determining device 1 executes the process shown in FIG. 3 in parallel.

The heart rate identifying unit 153 identifies the actually measured heart rate based on the reflected wave received via the receiving unit 12 (S11). Furthermore, the temperature identifying unit 154 identifies the body surface temperature of the subject U based on the data acquired from the thermography (S12). The temperature specifying unit 154 determines whether the reliability of the specified body surface temperature is greater than or equal to a threshold (S13). If the temperature identification unit 154 determines that the reliability is less than the threshold (NO in S13), the determination unit 156 displays that there is a problem in measuring the body surface temperature, and then the control unit 15 returns the process to S11. return.

If the temperature identification unit 154 determines that the reliability is greater than or equal to the threshold (YES in S13), the temperature identification unit 154 corrects the body surface temperature based on the space temperature, and then converts the body surface temperature into a deep body temperature. (S14). The calculation unit 155 calculates the estimated heart rate by multiplying the core body temperature by a predetermined coefficient (S15). The determination unit 156 compares the measured heart rate and the estimated heart rate (S16), and if the relationship between the measured heart rate and the estimated heart rate satisfies the first condition (YES in S17), the probability of heat stroke is high. It is determined that the alert information is output (S18). If the determination unit 156 determines that the relationship between the measured heart rate and the estimated heart rate does not satisfy the first condition (NO in S17), for example, the control unit 15 returns the process to S11 and continuously measures; The unit 15 may end the measurement without continuing the measurement.

[Modified example]
FIG. 4 is a diagram showing the configuration of a heat stroke determining device 1A according to a modification. The heat stroke determining device 1A shown in FIG. 4 differs from the heat stroke determining device 1 shown in FIG. 2 in that it further includes a spectrum specifying section 157, but is the same in other respects. The heatstroke determining device 1A does not need to include the temperature identifying section 154 and the calculating section 155.

In a state where the sympathetic nerves are activated and the parasympathetic nerves are deactivated, the heart rate fluctuation amount (RR interval fluctuation amount) becomes small. A state in which the sympathetic nerves are activated and are more dominant than the parasympathetic nerves is highly likely to be a state in which the subject U is under stress. When subject U is under stress, the ability to regulate body temperature in a hot environment decreases, increasing the possibility of heat stroke. Therefore, the heatstroke determining device 1A determines whether or not there is a high probability that the subject U is suffering from heatstroke, based on the frequency component of the heart rate fluctuation amount that is correlated with the state of the autonomic nervous system.

In order to enable the determining unit 156 to determine whether there is a high probability of heat stroke based on the frequency component of the heart rate fluctuation amount, the spectrum specifying unit 157 performs measurements at different times (for example, at 100 millisecond intervals). Based on the plurality of actually measured heart rates, a frequency spectrum of the amount of heart rate variation, which is the amount of variation in the actually measured heart rate, is specified. The spectrum specifying unit 157 specifies the frequency spectrum of the heart rate variation amount by, for example, Fourier transforming the waveform data indicating the heart rate variation amount composed of a plurality of measured heart rate data. The determining unit 156 determines that the ratio of the second component of the heart rate fluctuation amount included in a second frequency band lower than the first frequency band to the first component of the heart rate fluctuation amount included in the first frequency band is equal to or greater than a threshold value. Alert information is output when the second condition is satisfied.

In order to determine whether or not the amount of heart rate variation satisfies the second condition, the determination unit 156 first determines which of the following three frequency regions the frequency spectrum of the specified amount of heart rate variation is included in. Depending on whether the patient is suffering from heatstroke, it is determined whether or not there is a high probability of heat stroke.
VLF: Low frequency region (0Hz-0.05Hz)
LF: intermediate frequency region (0.05Hz-0.20Hz)
HF: High frequency region (0.20Hz-0.35Hz)

The low frequency region is susceptible primarily to sympathetic nerve activity. The intermediate frequency region is susceptible to sympathetic and parasympathetic activity. High frequency regions are susceptible to parasympathetic activity caused by breathing. Utilizing such properties, the determining unit 156 estimates the balance between sympathetic nerve activity and parasympathetic nerve activity, depending on which frequency region the frequency spectrum identified by the spectrum identifying unit 157 is included.

Specifically, the determination unit 156 determines that if the frequency spectrum has the highest proportion of the high frequency region (corresponding to the first frequency band), the parasympathetic nervous system is activated and the subject U is relaxed. It is determined that the state is On the other hand, when the proportion of the frequency spectrum that is included in the low frequency region (corresponding to the second frequency band) is the highest, the determining unit 156 determines that the sympathetic nerves are activated and that the subject U is in a stressed state. do. That is, the determining unit 156 determines that the subject U is in a stressed state when the second condition that the ratio of the low frequency component to the high frequency component in the frequency spectrum of the heart rate variation is equal to or higher than the threshold is satisfied. , when the ratio of low frequency components to high frequency components is less than a threshold value, it is determined that the subject U is in a relaxed state.

If the determining unit 156 determines that the subject U is in a stressed state, it determines that there is a high probability that the subject U is suffering from heatstroke, and outputs alert information. If the determining unit 156 determines that the subject U is in a relaxed state, it determines that the probability of heat stroke is low and does not output alert information.

In this way, the determination unit 156 determines whether or not there is a high probability of heat stroke based on the ratio of low frequency components to high frequency components in the frequency spectrum of heart rate variability, thereby reducing the risk of heat stroke. Nevertheless, it is possible to reduce the probability that a heatstroke warning will be issued when the core body temperature is above the threshold.

Note that the determination unit 156 determines whether heatstroke is occurring based on both the relationship between the measured heart rate and the estimated heart rate based on the core body temperature, and the ratio of the low frequency component to the high frequency component in the frequency spectrum of the heart rate fluctuation amount. A certain probability may be determined. For example, the determination unit 156 calculates a first score indicating the probability of heat stroke based on the relationship between the measured heart rate and the estimated heart rate based on core body temperature, and calculates the first score indicating the probability of heat stroke, and calculates the first score indicative of the probability of heat stroke. Based on this, a second score indicating the probability of heat stroke is calculated. The determining unit 156 determines whether there is a high probability of heat stroke based on whether the result of adding or multiplying the first score and the second score is equal to or greater than a threshold value. In this way, the determination unit 156 determines the probability of heat stroke based on both the relationship with the estimated heart rate based on core body temperature and the ratio of low frequency components to high frequency components in the frequency spectrum of heart rate fluctuation. By making the determination, the determination accuracy is further improved.

[Effects of heat stroke determination device 1]
As explained above, the heat stroke determination device 1 outputs alert information indicating that heat stroke is suspected when the relationship between the measured heart rate and the estimated heart rate satisfies the first condition, and Alert information is not output when the relationship between and the estimated heart rate does not satisfy the first condition. In this way, the heat stroke determination device 1 determines whether the probability of heat stroke is high or low based on the relationship between the measured heart rate and the estimated heart rate. It is possible to prevent a heat stroke warning from being issued in such a case.

In addition, the heat stroke determination device 1 determines whether the frequency component of the heart rate fluctuation amount is contained more in the high frequency region or the low frequency region, based on the frequency spectrum of the heart rate fluctuation amount, which is the fluctuation amount of the actually measured heart rate. The probability of heatstroke is determined based on whether or not the animal is suffering from heatstroke. This also prevents a heatstroke warning from being issued when the core body temperature is above the threshold even though the risk of heatstroke is low.

In the above explanation, the heart rate identification unit 153 identified the measured heart rate of the subject U by the heat stroke determination device 1 transmitting millimeter wave band radio waves to the subject U. The method by which the number identifying unit 153 identifies the actually measured heart rate is not limited to this and may be any method. The heart rate identification unit 153 may identify the actual heart rate based on data transmitted from a heart rate monitor worn by the subject U, for example. Moreover, the method by which the temperature identification unit 154 identifies the core body temperature is also arbitrary, and the core body temperature of the subject U may be identified based on data transmitted from a thermometer that can measure the core body temperature.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes can be made within the scope of the gist. be. For example, all or part of the device can be functionally or physically distributed and integrated into arbitrary units. In addition, new embodiments created by arbitrary combinations of multiple embodiments are also included in the embodiments of the present invention. The effects of the new embodiment resulting from the combination have the effects of the original embodiment.

1 Heat stroke determining device 2 Information terminal 11 Transmitting section 12 Receiving section 13 Communication section 14 Storage section 15 Control section 151 Instruction receiving section 152 Radio wave control section 153 Heart rate specifying section 154 Temperature specifying section 155 Calculating section 156 Judging section 157 Spectrum specifying section

Claims (8)

a heart rate identification unit that identifies the measured heart rate of the subject;
a temperature identification unit that identifies the core body temperature of the subject;
a calculation unit that calculates an estimated heart rate based on the core body temperature;
If the relationship between the measured heart rate and the estimated heart rate satisfies a first condition, alert information indicating that heatstroke is suspected is output; a determination unit that does not output the alert information if a first condition is not satisfied;
A heat stroke determination device with The temperature specifying unit converts, as variables, the body surface temperature of the subject measured by a body temperature sensor and the temperature of the space measured by a temperature sensor provided in a space where the subject is present. determining the core body temperature based on a formula;
The heat stroke determining device according to claim 1. The calculation unit calculates the estimated heart rate by multiplying the core body temperature by a predetermined coefficient.
The heat stroke determining device according to claim 1. The calculation unit calculates the estimated heart rate by multiplying the core body temperature by the predetermined coefficient stored in the storage unit in association with the subject.
The heat stroke determining device according to claim 3. The calculation unit calculates the minimum value of the estimated heart rate and the maximum value of the estimated heart rate,
The determination unit outputs the alert information when the first condition that the measured heart rate is not included between the minimum value of the estimated heart rate and the maximum value of the estimated heart rate is satisfied;
The heat stroke determining device according to claim 1. further comprising a spectrum identifying unit that identifies a frequency spectrum of a heart rate fluctuation amount, which is a fluctuation amount of the measured heart rate, based on the plurality of measured heart rates measured at different times,
The determining unit is configured to determine that a ratio of a second component of the heart rate variation amount included in a second frequency band lower than the first frequency band to a first component of the heart rate variation amount included in the first frequency band is outputting the alert information when a second condition of being equal to or greater than a threshold is met;
The heat stroke determining device according to claim 1. computer executes
a step of identifying the measured heart rate of the subject;
determining the core body temperature of the subject;
calculating an estimated heart rate based on the core body temperature;
outputting alert information indicating that heatstroke is suspected when the relationship between the measured heart rate and the estimated heart rate satisfies a predetermined condition;
A method for determining heat stroke. to the computer,
a step of identifying the measured heart rate of the subject;
determining the core body temperature of the subject;
calculating an estimated heart rate based on the core body temperature;
outputting alert information indicating that heatstroke is suspected when the relationship between the measured heart rate and the estimated heart rate satisfies a predetermined condition;
A program to run.

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