TWI889531B - Heat stroke assessment device and program products - Google Patents

Abstract

The heat stroke determination device 1 comprises: a heart rate determination unit 153 for determining the measured heart rate of the subject U; a temperature determination unit 154 for determining the deep body temperature of the subject U; a calculation unit 155 for calculating the estimated heart rate based on the deep body temperature; and a determination unit 156 for outputting alarm information indicating suspected heat stroke when the relationship between the measured heart rate and the estimated heart rate satisfies the first condition, and not outputting the alarm information when the relationship between the measured heart rate and the estimated heart rate does not satisfy the first condition.

Description

Heat stroke determination device and program products

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

Previously, a technology for determining whether a patient has heat stroke based on deep body temperature is known (for example, refer to Patent Document 1).

[Prior art literature]

[Patent Literature]

[Patent document 1] Japanese Patent Publication No. 2018-134137

Even if the deep body temperature rises, the autonomic nervous system functions normally, so the risk of heat stroke is low. However, in the prior art, there is a problem that a heat stroke warning is issued when the deep body temperature is above a critical value, even though the risk of heat stroke is low.

Therefore, the present invention is completed in view of the above aspects, and its purpose is to improve the accuracy of heat stroke determination.

The first form of the heat stroke determination device of the present invention comprises: a heart rate determination unit for determining the measured heart rate of the subject; a temperature determination unit for determining the deep body temperature of the subject; a calculation unit for calculating the estimated heart rate based on the deep body temperature; and a determination unit for outputting warning information indicating suspected heat stroke when the relationship between the measured heart rate and the estimated heart rate satisfies a first condition, and not outputting the warning information when the relationship between the measured heart rate and the estimated heart rate does not satisfy the first condition.

The temperature determination unit can determine the deep body temperature based on a conversion formula, wherein the conversion formula uses the surface temperature of the subject measured by the body temperature sensor and the temperature of the space measured by the temperature sensor set in the space where the subject is located as variables.

The calculation unit can calculate the estimated heart rate by multiplying the deep body temperature by a specified coefficient.

The calculation unit can calculate the estimated heart rate by multiplying the deep body temperature by the prescribed coefficient stored in the storage unit in association with the subject.

The calculation unit calculates the minimum value of the estimated heart rate and the maximum value of the estimated heart rate. When the first condition is met, the determination unit can output the alarm information. The first condition is 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.

The heat stroke determination device further includes a spectrum determination unit, which determines a spectrum of a heart rate variation amount as a variation amount of the measured heart rate based on a plurality of the measured heart rates measured at different times, and the determination unit outputs the alarm information when a second condition is satisfied, the second condition being that a ratio of a second component of the heart rate variation amount contained in a second frequency band lower than the first frequency band to a first component of the heart rate variation amount contained in a first frequency band is greater than a critical value.

The second form of the heat stroke determination method of the present invention has the following steps executed by a computer: determining the measured heart rate of the subject; determining the deep body temperature of the subject; calculating the estimated heart rate based on the deep body temperature; and outputting warning information indicating suspected heat stroke when the relationship between the measured heart rate and the estimated heart rate meets the prescribed conditions.

The third form of the program product of the present invention is a program product for causing a computer to execute the following steps: determining the measured heart rate of the subject; determining the deep body temperature of the subject; calculating the estimated heart rate based on the deep body temperature; and outputting warning information indicating suspected heat stroke when the relationship between the measured heart rate and the estimated heart rate meets the specified conditions.

According to the present invention, the accuracy of heat stroke determination is improved.

1. 1A: Heat stroke determination device

2: Information terminal

11: Shipping Department

12: Receiving Department

13: Communications Department

14: Storage Department

15: Control Department

151: Instruction Receiving Department

152: Radio Control Department

153: Heart rate determination unit

154: Temperature determination unit

155: Computing Department

156: Judgment Department

157: Score determination section

RX: reflected wave

S11, S12, S13, S14, S15, S16, S17, S18, S19: Steps

TX: Transmit wave

U: Person being tested/person being measured

FIG1 is a diagram for explaining the outline of a heat stroke determination device 1.

FIG2 is a diagram showing the structure of the heat stroke determination device 1.

FIG3 is a flow chart showing the process flow in the heat stroke determination device 1.

FIG. 4 is a diagram showing the structure of a heat stroke determination device 1A according to a modified example.

[Overview of heat stroke determination device 1]

FIG1 is a diagram for explaining the outline of a heat stroke determination device 1. The heat stroke determination device 1 is a device for determining whether the subject U suffers from heat stroke. The heat stroke determination device 1 can be any device having a processor capable of performing computational processing, such as a computer, a smartphone, or a dedicated device.

The heat stroke determination device 1 transmits and receives data with the information terminal 2 via an intranet or short-range wireless communication. The heat stroke determination device 1 transmits the determination result of whether it is heat stroke to the information terminal 2, and the information terminal 2 displays the determination result. The heat stroke determination device 1 can also display the determination result on a display provided in the heat stroke determination device 1.

The heat stroke determination device 1 determines whether the subject U has heat stroke based on whether the relationship between the heart rate estimated based on the deep body temperature of the subject U and the measured heart rate is consistent with the relationship in the case where the possibility of heat stroke is high. By operating the heat stroke determination device 1 in this way, for example, when the body temperature of the subject U rises due to exercise and the heart rate also increases, the heat stroke determination device 1 can determine that the body temperature rise is caused by exercise, not the body temperature rise caused by heat stroke. On the other hand, when the deep body temperature rises despite the heart rate of the subject U not increasing, the heat stroke determination device 1 can determine that the possibility of body temperature rise due to heat stroke is high, and output alarm information.

The details will be described later. For example, the heat stroke determination device 1 transmits a transmission wave TX as a high-frequency radio wave (such as a millimeter wave radar) toward the detected person U, and receives a reflected wave RX reflected by the detected person U. The heat stroke determination device 1 determines the cycle of the heartbeat of the detected person U by analyzing the received reflected wave RX, thereby measuring the heart rate. High-frequency radio waves include, for example, chirping signals whose frequency changes with the passage of time. The heat stroke determination device 1 performs Fourier transformation on the reflected signal to convert it into the frequency domain, and determines the frequency contained in the reflected signal, thereby measuring the propagation time from the transmission of the signal of the frequency to the reception, and measures the heart rate based on the changing cycle of the propagation time.

The structure and operation of the heat stroke determination device 1 are described in detail below.

[Structure of heat stroke determination device 1]

FIG2 is a diagram showing the structure of the heat stroke determination device 1. The heat stroke determination device 1 has: a transmitting unit 11, a receiving unit 12, a communication unit 13, a storage unit 14, and a control unit 15. The control unit 15 has: an instruction receiving unit 151, a radio wave control unit 152, a heart rate determination unit 153, a temperature determination unit 154, a calculation unit 155, and a determination unit 156.

Under the control of the radio wave control unit 152, the transmitting unit 11 transmits a transmission signal of a frequency band above the millimeter wave band at a specified time interval. The transmitting unit 11 transmits a chirp signal, for example, at a period of 12.5 milliseconds. The transmitting unit 11 has: a signal generating circuit for generating a chirp signal, and an antenna for transmitting the transmission signal as a radio wave. As an example, the heat stroke determination device 1 may have a plurality of transmitting units 11, and the plurality of transmitting units 11 transmit transmission signals to different ranges at different time points. In the above case, the heat stroke determination device 1 can simultaneously determine whether each of the plurality of subjects U has heat stroke.

The transmitting unit 11 transmits the transmission signal at a time interval of less than half a cycle of the minimum value of the cycle of the change of the biological state set in advance. For example, assuming that the maximum value of the heart rate is 150 beats/minute, the minimum value of the change cycle of the heart rate is 0.4 seconds. Therefore, the transmitting unit 11 transmits the transmission signal at a time interval of less than 0.2 seconds. By transmitting the transmission signal at such a time interval by the transmitting unit 11, the heat stroke determination device 1 can determine the change state of the body part of the measured person U based on the reflected signal received by the receiving unit 12 at this time interval. The length of the transmission signal sent by the transmitting unit 11 is arbitrary, but it is ideally sufficiently shorter than the time interval of sending the transmission signal, for example, within 2 milliseconds.

The receiving unit 12 receives the reflected signal generated by the transmission signal being reflected at the measured person U. As an example, the receiving unit 12 may have a plurality of receiving units 12, and the plurality of receiving units 12 respectively receive reflected signals from different ranges. The receiving unit 12 inputs the received reflected signal to the heart rate determination unit 153.

The communication unit 13 has a communication interface for transmitting and receiving various data with 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 user's operation content input into the information terminal 2. In addition, the communication unit 13 sends the determination result output by the determination unit 156 to the information terminal 2.

The communication unit 13 can receive data representing the temperature from a measuring device that measures the body surface temperature of the subject U and the temperature of the space where the subject U is located. The communication unit 13 inputs the received temperature data to the calculation unit 155.

The storage unit 14 has storage media such as a read-only memory (ROM) and a random access memory (RAM). The storage unit 14 stores the program executed by the control unit 15. The storage unit 14 may also include a storage medium disposed outside the heat stroke determination device 1, such as a compact disc read-only memory (CD-ROM) storing a program. In addition, the storage unit 14 stores the reflected signal received by the receiving unit 12 and the heart rate calculated by the control unit 15 by analyzing the reflected signal.

The control unit 15 has, for example, a central processing unit (CPU). The control unit 15 functions as an instruction receiving unit 151, a radio wave control unit 152, a heart rate determination unit 153, a temperature determination unit 154, a calculation unit 155, a determination unit 156, and a spectrum determination unit 157 by executing a program stored in the storage unit 14.

The instruction receiving unit 151 receives instruction data input from the information terminal 2 via the communication unit 13. For example, the instruction receiving unit 151 receives instructions to start a heat stroke test. The instruction receiving unit 151 can also receive instructions to set attributes such as age, gender, and weight of the subject U.

The radio control unit 152 controls the transmitter 11 and the receiver 12. For example, the radio control unit 152 controls the time when the transmitter 11 transmits the transmission signal. In addition, the radio control unit 152 controls the range in which the transmitter 11 transmits the transmission signal and the range in which the receiver 12 receives the reflected signal.

The heart rate determination unit 153 determines the measured heart rate of the subject U. Specifically, the heart rate determination unit 153 determines the change cycle of the distance between the heat stroke determination device 1 and the part where the signal transmitted by the transmission unit 11 is reflected based on the reflected wave received by the receiving unit 12, thereby determining the heart rate of the subject U.

The heart rate determination unit 153, for example, performs Fourier transformation on the reflected signal received by the receiving unit 12 to convert it into a signal in the frequency domain. The heart rate determination unit 153 determines the frequency component contained in the chirp signal constituting the reflected signal in the frequency domain, and determines the difference between the time when the transmitting unit 11 transmits the frequency component and the time when the receiving unit 12 receives the frequency component contained in the reflected signal as the propagation time.

The heat stroke determination device 1 determines the distance to the part where the radio wave is reflected based on the propagation time. When it is determined that the change in distance over time is caused by the change in distance due to the heartbeat, the heat stroke determination device 1 calculates the heart rate based on the cycle of the change. When the cycle of the change in distance is within the range assumed to be the cycle of the heartbeat and the amplitude of the change in distance is a size corresponding to the amount of change on the surface of the heart, the heat stroke determination device 1 calculates the heart rate based on the cycle of the change in distance. The heart rate determination unit 153 notifies the temperature determination unit 154 of the calculated heart rate in association with the time.

The temperature determination unit 154 determines the deep body temperature of the subject U based on the surface temperature of the subject U and the temperature of the space where the subject U is located. The temperature determination unit 154 determines the deep body temperature based on a conversion formula that uses the surface temperature of the subject U measured by the body temperature sensor and the temperature of the space measured by the temperature sensor set in the space where the subject U is located as variables.

The temperature determination unit 154 obtains, for example, body surface temperature data indicating the distribution of the body surface temperature of the subject U measured by the temperature recorder and spatial temperature data indicating the spatial temperature measured by the thermometer. The temperature determination unit 154 sets the highest temperature among the body surface temperatures at multiple locations 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 temperature recorder generates an error due to the temperature around the temperature measuring device. Therefore, the temperature determination unit 154 corrects the body surface temperature based on the spatial temperature data. Specifically, when the body surface temperature is set to Ts, the spatial temperature is set to Ta, and the corrected body surface temperature is set to Tsh, the temperature determination unit 154 corrects the body surface temperature, for example, by the following formula.

Tsh=Ts+a1×Ta ² +b1×Ta-c1

Here, a1, b1, c1 are coefficients.

Then, the temperature determination unit 154 determines the deep body temperature Td based on the corrected body surface temperature Tsh, for example, by the following formula. The temperature determination unit 154 inputs the determined deep body temperature to the calculation unit 155.

Td=a2×Tsh ³ -b2×Tsh ² +c2×Tsh-d

Here, a2, b2, c2, d are coefficients.

The calculation unit 155 calculates the estimated heart rate based on the deep body temperature of the subject U determined by the temperature determination unit 154. It is known that there is a correlation between the deep body temperature and the heart rate, and the calculation unit 155 calculates the estimated heart rate by multiplying the deep body temperature by a prescribed coefficient corresponding to the correlation. The calculation unit 155 can also calculate the estimated heart rate by multiplying the deep body temperature by a prescribed coefficient stored in the storage unit 14 in association with the subject U or the attribute of the subject U. The calculation unit 155 calculates the minimum and maximum values of the estimated heart rate based on the assumption that the heart rate increases by 10 if the deep body temperature rises by 0.55°C, for example, by the following formula.

BT-Th=△BT

△HR=(△BT÷0.55)×10

HRE _min =HR _min +△HR

HRE _max =HR _max +△HR

Here, BT is the deep body temperature, Th is the standard deep body temperature (for example, 36.5°C), △BT is the difference between the deep body temperature and the standard deep body temperature, △HR is the estimated value of the difference from the standard heart rate, 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 heart rates of the subject U measured in a healthy and quiet state. HR _min and HR _max may be pre-stored in the storage unit 14 and 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 determination unit 156 determines whether the possibility of the subject U suffering from heat stroke is high based on the relationship between the measured heart rate and the estimated heart rate. When the relationship between the measured heart rate and the estimated heart rate satisfies the first condition stored in the storage unit 14, the determination unit 156 outputs warning information indicating suspected heat stroke, and when the relationship between the measured heart rate and the estimated heart rate does not satisfy the first condition, the determination unit 156 does not output warning information. The first condition is, for example, the condition that the measured heart rate is not included between the minimum and maximum values of the estimated heart rate.

For example, when HR _min is 60 and HR _max is 85, the determination unit 156 determines that the relationship between the fever state and the heart rate of the subject U is abnormal and the possibility of heat stroke is high under the following circumstances.

Measured heart rate <60+△HR or 85+△HR<measured heart rate

On the other hand, the determination unit 156 determines that the relationship between the fever status and heart rate of the subject U is normal and the possibility of heat stroke is low in the following circumstances.

60+△HR≦actual heart rate≦85+△HR

As described above, the determination unit 156 determines whether the possibility of the subject U suffering from heat stroke is high based on the relationship between the measured heart rate and the estimated heart rate based on the deep body temperature, thereby reducing the probability of issuing a heat stroke warning when the deep body temperature is above the critical value even though the possibility of heat stroke is low.

Furthermore, in the above description, it is assumed that the body surface temperature is measured correctly, but sometimes the body surface temperature is not actually measured correctly. In this case, if the possibility of heat stroke of the detected person U is high is determined based on the relationship between the measured heart rate and the estimated heart rate based on the deep body temperature, there is a concern of misjudgment. Therefore, the determination unit 156 determines whether the reliability of the measured body surface temperature is high. When the reliability of the measured body surface temperature is above the critical value and the relationship with the estimated heart rate based on the deep body temperature satisfies the first condition, it can be determined that the possibility of heat stroke is high.

The determination unit 156 determines that the reliability of the body surface temperature does not meet the critical value in any of the following situations, for example.

(1) The maximum temperature displayed by the data obtained from the temperature recorder is outside the rated range

(2) The area of the highest temperature region in the temperature image obtained from the temperature recorder does not reach the critical value.

(3) The measured body surface temperature is above the critical value (e.g. 30°C)

(4) The heart rate determination unit 153 fails to detect a heartbeat (no person is detected)

[Processing flow in heat stroke determination device 1]

FIG3 is a flowchart showing the flow of processing in the heat stroke determination device 1. The flowchart shown in FIG3 starts from the time when the heat stroke determination device 1 starts transmitting radio waves for measuring the heart rate to the detected person U. When the heat stroke determination device 1 determines whether each of the multiple detected persons U has heat stroke, the heat stroke determination device 1 executes the processing shown in FIG3 in parallel.

The heart rate determination unit 153 determines the measured heart rate based on the reflected wave received by the receiving unit 12 (S11). In addition, the temperature determination unit 154 determines the body surface temperature of the subject U based on the data obtained from the temperature recorder (S12). The temperature determination unit 154 determines whether the reliability of the determined body surface temperature is above the critical value (S13). When the temperature determination unit 154 determines that the reliability is less than the critical value (No in S13), the determination unit 156 displays that there is a problem in the measurement of the body surface temperature, and then the control unit 15 returns the processing to S11.

When the temperature determination unit 154 determines that the reliability is above the critical value (YES in S13), the temperature determination unit 154 corrects the body surface temperature based on the space temperature and then converts the body surface temperature into the deep body temperature (S14). The calculation unit 155 calculates the estimated heart rate by multiplying the deep body temperature by a predetermined coefficient (S15). The determination unit 156 compares the measured heart rate with the estimated heart rate (S16), and when the relationship between the measured heart rate and the estimated heart rate satisfies the first condition (YES in S17), it determines that the possibility of heat stroke is high and outputs alarm information (S18). When 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 continues the measurement, but the control unit 15 may terminate the measurement without continuing the measurement.

[Variations]

FIG. 4 is a diagram showing the structure of a heat stroke determination device 1A of a modified example. The heat stroke determination device 1A shown in FIG. 4 is different from the heat stroke determination device 1 shown in FIG. 2 in that it further includes a spectrum determination unit 157, and is the same in other aspects. The heat stroke determination device 1A may not include the temperature determination unit 154 and the calculation unit 155.

When the sympathetic nerves are activated and the parasympathetic nerves are inactivated, the heart rate variation (R-R interval variation) becomes smaller. When the sympathetic nerves are activated and more dominant than the parasympathetic nerves, it is highly likely that the subject U is under stress. If the subject U is under stress, the body temperature regulation function in a hot environment decreases, and the possibility of heat stroke increases. Therefore, the heat stroke determination device 1A determines whether the subject U is likely to have heat stroke based on the frequency component of the heart rate variation that is correlated with the state of the autonomic nervous system.

In order to enable the determination unit 156 to determine whether the possibility of heat stroke is high based on the frequency component of the heart rate variation, the spectrum determination unit 157 determines the spectrum of the heart rate variation as the variation of the measured heart rate based on a plurality of measured heart rates measured at different times (e.g., 100 millisecond intervals). The spectrum determination unit 157 determines the spectrum of the heart rate variation by, for example, Fourier transforming waveform data representing the heart rate variation including data of a plurality of measured heart rates. The determination unit 156 outputs alarm information when the second condition is satisfied, the second condition being that the ratio of the second component of the heart rate variation contained in the second frequency band lower than the first frequency band to the first component of the heart rate variation contained in the first frequency band is greater than a critical value. The second condition is a condition stored in the storage unit 14.

In order to determine whether the heart rate variability satisfies the second condition, the determination unit 156 first determines whether the possibility of heat stroke is high based on which of the following three frequency domains contains the spectrum of the determined heart rate variability.

VLF: Low frequency range (0Hz-0.05Hz)

LF: middle frequency (0.05Hz-0.20Hz)

HF: High frequency range (0.20Hz-0.35Hz)

The low frequency range is mainly susceptible to the sympathetic nerve activity. The middle frequency range is susceptible to the sympathetic nerve activity and the parasympathetic nerve activity. The high frequency range is susceptible to the parasympathetic nerve activity caused by breathing. Using this property, the determination unit 156 estimates the balance between the sympathetic nerve activity and the parasympathetic nerve activity according to which frequency range contains the spectrum determined by the spectrum determination unit 157.

Specifically, when the proportion of the spectrum included in the high frequency domain (corresponding to the first frequency band) is the largest, the determination unit 156 determines that the parasympathetic nerves are activated and the subject U is in a relaxed state. On the other hand, when the proportion of the spectrum included in the low frequency domain (corresponding to the second frequency band) is the largest, the determination unit 156 determines that the sympathetic nerves are activated and the subject U is in a stressed state. That is, when the second condition that the ratio of the low-frequency component to the high-frequency component in the spectrum of the heart rate variation is greater than the critical value is met, the determination unit 156 determines that the subject U is in a state of stress, and when the ratio of the low-frequency component to the high-frequency component does not meet the critical value, it determines that the subject U is in a state of relaxation.

When the determination unit 156 determines that the subject U is under stress, it determines that the possibility of heat stroke is high and outputs warning information. When the determination unit 156 determines that the subject U is in a relaxed state, it determines that the possibility of heat stroke is low and does not output warning information.

As described above, the determination unit 156 determines whether the possibility of heat stroke is high based on the ratio of low-frequency components to high-frequency components in the spectrum of heart rate variability, thereby reducing the probability of issuing a heat stroke warning when the deep body temperature is above the critical value despite the low risk of heat stroke.

Furthermore, the determination unit 156 may determine the possibility of heat stroke based on the relationship between the measured heart rate and the estimated heart rate based on the deep body temperature and the ratio of the low-frequency component to the high-frequency component in the spectrum of the heart rate variability. For example, the determination unit 156 calculates a first score indicating the possibility of heat stroke based on the relationship between the measured heart rate and the estimated heart rate based on the deep body temperature, and calculates a second score indicating the possibility of heat stroke based on the ratio of the low-frequency component to the high-frequency component. The determination unit 156 determines whether the possibility of heat stroke is high based on whether the result of adding or multiplying the first score and the second score is above a critical value. As described above, the determination unit 156 determines the possibility of heat stroke based on the relationship with the estimated heart rate based on the deep body temperature and the ratio of the low-frequency component to the high-frequency component in the spectrum of the heart rate variability, thereby further improving the determination accuracy.

[Based on the effect of heat stroke determination device 1]

As described above, when the relationship between the measured heart rate and the estimated heart rate satisfies the first condition, the heat stroke determination device 1 outputs warning information indicating suspected heat stroke, and when the relationship between the measured heart rate and the estimated heart rate does not satisfy the first condition, the heat stroke determination device 1 does not output warning information. As described above, the heat stroke determination device 1 determines the possibility of heat stroke based on the relationship between the measured heart rate and the estimated heart rate, thereby preventing a heat stroke warning from being issued when the deep body temperature is above the critical value despite the low risk of heat stroke.

In addition, the heat stroke determination device 1 determines the possibility of heat stroke based on the spectrum of the heart rate variation as the variation of the measured heart rate, and according to which of the high frequency domain and the low frequency domain contains more frequency components of the heart rate variation. This also prevents the warning of heat stroke from being issued when the deep body temperature is above the critical value even though the risk of heat stroke is low.

Furthermore, in the above description, the heat stroke determination device 1 transmits radio waves in the millimeter wave band to the subject U, whereby the heart rate determination unit 153 determines the measured heart rate of the subject U, but the method by which the heart rate determination unit 153 determines the measured heart rate is not limited thereto and is arbitrary. For example, the heart rate determination unit 153 can determine the measured heart rate based on data sent from a heart rate meter worn by the subject U. In addition, the method by which the temperature determination unit 154 determines the deep body temperature is also arbitrary, and the deep body temperature of the subject U can be determined based on data sent from a thermometer that can measure the deep body temperature.

The above uses the implementation form to illustrate the present invention, but the technical scope of the present invention is not limited to the scope described in the implementation form, and various modifications and changes can be made within the scope of its main purpose. For example, all or part of the device can be functionally or physically dispersed and integrated in any unit. In addition, new implementation forms generated by any combination of multiple implementation forms are also included in the implementation forms of the present invention. The effect of the new implementation form generated by the combination has the effect of the original implementation form.

1: Heat stroke determination device

11: Shipping Department

12: Receiving Department

13: Communications Department

14: Storage Department

15: Control Department

151: Instruction Receiving Department

152: Radio Control Department

153: Heart rate determination unit

154: Temperature determination unit

155: Computing Department

156: Judgment Department

Claims (7)

A heat stroke determination device comprises: a heart rate determination unit for determining a measured heart rate of a subject; a temperature determination unit for determining a deep body temperature of the subject; a calculation unit for calculating an estimated heart rate based on the deep body temperature; and a determination unit for outputting warning information indicating suspected heat stroke when the relationship between the measured heart rate and the estimated heart rate satisfies a first condition, and not outputting the warning information when the relationship between the measured heart rate and the estimated heart rate does not satisfy the first condition. The heat stroke determination device as described in claim 1, wherein the temperature determination unit determines the deep body temperature based on a conversion formula, and the conversion formula uses the surface temperature of the subject measured by the body temperature sensor and the temperature of the space measured by the temperature sensor set in the space where the subject is located as variables. The heat stroke determination device as described in claim 1, wherein the calculation unit calculates the estimated heart rate by multiplying the deep body temperature by a predetermined coefficient. The heat stroke determination device as described in claim 3, wherein the calculation unit calculates the estimated heart rate by multiplying the deep body temperature by the prescribed coefficient stored in the storage unit in association with the subject. The heat stroke determination device as described in claim 1, wherein the calculation unit calculates the minimum value of the estimated heart rate and the maximum value of the estimated heart rate, and the determination unit outputs the warning information when the first condition is met, and the first condition is 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. The heat stroke determination device as described in claim 1 further comprises a spectrum determination unit, which determines the spectrum of the heart rate variation as the variation of the measured heart rate based on the plurality of measured heart rates measured at different times, and the determination unit outputs the alarm information when the second condition is satisfied, the second condition being that the ratio of the second component of the heart rate variation contained in the second frequency band lower than the first frequency band to the first component of the heart rate variation contained in the first frequency band is greater than a critical value. A program product, the program product is used to make a computer execute the following steps: determine the measured heart rate of the subject; determine the deep body temperature of the subject; calculate the estimated heart rate based on the deep body temperature; and output warning information indicating suspected heat stroke when the relationship between the measured heart rate and the estimated heart rate meets the specified conditions.