JP6341314B2 - Heart rate monitor, heart rate measuring method and heart rate measuring program - Google Patents

Description

  The present invention relates to a heart rate monitor, a heart rate measurement method, and a heart rate measurement program.

  Conventionally, heart rate monitors attached to the chest, so-called heart rate monitors, detect the period of a predetermined waveform (for example, R wave) from the acquired electrocardiogram waveform, and calculate the heart rate based on that period. Yes.

  By the way, if the heart rate monitor can be worn in a normal orientation with respect to the chest or upside down with respect to the normal orientation, the heart rate monitor may be worn upside down instead of the normal orientation. In this case, the electrocardiographic waveforms acquired by the heart rate monitor are inverted from each other when the direction in which the heart rate monitor is worn on the chest is a normal direction and when the direction is upside down. More specifically, when an electrocardiogram waveform including a positive R wave having a peak on the high voltage side is acquired when the heart rate monitor is worn in a normal direction, it is low when the heart rate monitor is worn in the reverse direction. An electrocardiographic waveform including a negative R wave having a peak on the voltage side is detected.

  Therefore, in recent heart rate monitors, in order to be able to calculate the heart rate even when the heart rate monitor is mounted upside down, a threshold value used for detection of a predetermined waveform with an electrocardiographic waveform including a positive R wave , Threshold values used for detection of a predetermined waveform are prepared for an electrocardiogram waveform including a negative R wave, and in calculating a heart rate from the electrocardiogram waveform, the electrocardiogram waveform first includes a positive R wave. It is determined whether the waveform is a waveform or a waveform including a negative R wave, and a predetermined waveform is detected using a corresponding threshold according to the determination result (see, for example, Patent Document 1). According to this technique, the heart rate can be calculated based on the electrocardiographic waveform in either the forward or reverse mode.

JP 2008-206704 A

  However, in the technique described in Patent Document 1, a process for detecting a predetermined waveform from an electrocardiogram waveform including a positive R wave and a process for detecting a predetermined waveform from an electrocardiogram waveform including a negative R wave are prepared. As a whole, the processing becomes complicated.

  An object of the present invention is to provide a heart rate monitor, a heart rate measurement method, and a heart rate measurement program capable of calculating a heart rate by a simple process compared to the conventional method regardless of the orientation of the heart rate monitor on the chest. is there.

In order to solve the above problems, the present invention provides a heart rate monitor,
A heart rate sensor for acquiring a user's electrocardiogram waveform;
A counting unit that counts an elapsed time since the heartbeat sensor started acquiring the electrocardiogram waveform;
A heart rate calculation unit that calculates a heart rate based on the electrocardiogram waveform acquired during the elapsed time;
A waveform inversion unit for inverting the electrocardiographic waveform acquired by the heart rate sensor;
With
The electrocardiographic waveform includes an electrocardiographic waveform of the first aspect including a first R wave having a peak on the high voltage side and a second electrocardiographic waveform including a second R wave having a peak on the low voltage side. Including either one,
When the electrocardiogram waveform includes the electrocardiogram waveform of the first aspect, the heart rate calculator calculates the heart rate for the electrocardiogram waveform, and the electrocardiogram waveform is the second aspect. The above heart rate is not calculated when the ECG waveform is included,
When the elapsed time by the counting unit is equal to or longer than a set time set to a time during which a plurality of the first R waves or the second R waves can be detected, the heart rate calculation unit When the heart rate is not calculated, the ECG waveform acquired by the heart rate sensor is inverted thereafter, and the ECG waveform is inverted by the waveform inversion unit. The heart rate calculation unit calculates the heart rate.

  According to the present invention, the heart rate can be calculated by a simpler process compared to the related art regardless of the orientation of the heart rate monitor on the chest.

It is a figure which shows the state with which the heart rate monitor was mounted | worn. It is an external view of a heart rate monitor main body. It is a block diagram which shows schematic structure of a heart rate monitor. It is a flowchart which shows the flow of a heart rate calculation process. It is a flowchart which shows the flow of a waveform detection process. (A) is a figure which shows the electrocardiogram waveform of a 1st aspect, (b) is a figure which shows the electrocardiogram waveform of a 2nd aspect. It is a flowchart which shows the flow of the heart rate calculation process in a modification. It is a flowchart which shows the flow of the heart rate calculation process in a modification.

  Hereinafter, an example of an embodiment according to the present invention will be described in detail with reference to the accompanying drawings. However, the scope of the invention is not limited to the illustrated examples.

[1. Appearance configuration]
FIG. 1 is a plan view showing a heart rate monitor (heart rate monitor) 1 according to the present embodiment.

  As shown in this figure, the heart rate monitor 1 measures a heart rate of a user who performs an exercise such as running, and includes a heart rate monitor main body 2 and a monitor device 5.

  The heart rate monitor main body 2 is mounted on a user's chest and measures a heart rate, and includes a band-shaped band 21 and a flat-plate-shaped casing 20 as shown in FIG.

  The band 21 has elasticity, and is engaged with both side surfaces of the casing 20 to form an annular shape with the casing 20. Thereby, when the heart rate monitor 1 is mounted on the chest of the user, the band 21 tightens the chest so that the housing 20 is in close contact with the chest.

Electrodes 210 and 211 are disposed in a region adjacent to the casing 20 on the inner side surface (the chest side surface) of the band 21.
These electrodes 210 and 211 are connected to a heart rate sensor 30 described later, and the heart rate sensor 30 acquires a voltage induced between the electrode 210 and the electrode 211 as a voltage corresponding to the electrocardiographic waveform.

  The housing 20 has a vertical orientation, and has a switch 200 on the lower surface and an LED 201 on the lower part of the outer surface (surface opposite to the chest). Among these, the switch 200 is a main switch operated to activate the heart rate monitor 1. The LED 201 indicates that the heart rate monitor 1 is in an activated state.

  The case 20 described above is opposite to the state in which the heart rate monitor 1 is oriented in the vertical direction (hereinafter referred to as the upward state, see FIG. 2A) when the heart rate monitor 1 is worn on the chest. It can be brought into contact with the chest in any state of wearing in a state of being oriented (hereinafter referred to as a downward state, see FIG. 2B).

  The monitor device 5 is attached to the user's wrist and displays a heart rate measurement result, and includes a display 50. The display 50 includes a 7-segment display and the like.

[2. Functional configuration]
FIG. 3 is a block diagram showing a functional configuration of the heart rate monitor 1 in the present embodiment.
As shown in this figure, the monitor device 5 of the heart rate monitor 1 includes a display unit 51 and a communication module 52.

  The display unit 51 includes the display 50 described above, and displays various information on the display 50 based on a display signal transmitted from the communication module 52.

  The communication module 52 performs wireless communication with a communication module 31 described later in the heart rate monitor main body 2 and transmits a signal received from the communication module 31 to the display unit 51. In the present embodiment, various systems such as Bluetooth (Bluetooth (registered trademark)) and WiFi (WiFi; wireless fidelity (registered trademark)) are used as wireless communication systems. In the above description, the communication module 52 performs wireless communication. However, the communication module 52 may perform various types of wired communication via a communication cable such as a USB (Universal Serial Bus) cable.

  The heart rate monitor main body 2 of the heart rate monitor 1 includes a heart rate sensor 30, a communication module 31, a counter 32, a flash memory 33, a work memory 34, and a sensor data storage memory 35 inside the housing 20. And a control unit 38 and the like.

  Among these, the heart rate sensor 30 acquires a user's electrocardiogram waveform via the electrodes 210 and 211 described above. In the heart rate sensor 30, the positions of the electrodes 210 and 211 with respect to the heart are reversed on the right and left depending on whether the mounting state of the housing 20 on the chest is an upward state or a downward state. For this reason, when the wearing state is different, the wearing direction of the heart rate sensor 30 with respect to the chest is different, and an electrocardiographic waveform having a different aspect is acquired. More specifically, in this heart rate sensor 30, as shown in FIG. 6 described later, an electrocardiographic waveform acquired depending on whether the mounting state of the housing 20 on the chest is an upward state or a downward state. Is an electrocardiographic waveform (hereinafter referred to as the electrocardiographic waveform of the first mode) including a R wave (hereinafter referred to as a positive R wave) having a peak on the high voltage side and having a positive voltage value with respect to the waveform center voltage. 6) and an electrocardiographic waveform including an R wave having a peak on the low voltage side and a negative voltage value relative to the waveform center voltage (hereinafter referred to as a negative R wave). Hereinafter, the electrocardiographic waveform of the second mode is selected (see FIG. 6B). In the present embodiment, when the mounting state of the housing 20 is upward, the electrocardiographic waveform acquired by the heart rate sensor 30 is a waveform including the electrocardiographic waveform of the first aspect, and the mounting state of the housing 20 It is assumed that the electrocardiographic waveform acquired by the heart rate sensor 30 is a waveform including the electrocardiographic waveform of the second aspect when is in the downward state. However, when the heart rate monitor 1 is attached to a subject having a specific heart, the electrocardiogram waveform including the electrocardiogram waveform of the second mode is obtained when the housing 20 is in the upward state. When the wearing state of the body 20 is a downward state, the electrocardiographic waveform may be a waveform including the electrocardiographic waveform of the second aspect.

The communication module 31 performs wireless communication with the communication module 52 in the monitor device 5. Note that the communication module 31 may perform wired communication with the communication module 52.
The counter 32 counts an elapsed time after the heartbeat sensor 30 starts acquiring an electrocardiogram waveform.

  The flash memory 33 is a memory that stores programs and data for realizing various functions of the heart rate monitor 1 and functions as a work area of the control unit 38. In the present embodiment, the flash memory 33 stores a heart rate measurement program 330 and the like. The heart rate measurement program 330 is a program for causing the control unit 38 to execute a heart rate calculation process (see FIG. 4) described later.

  The work memory 34 is a memory that functions as a work area of the control unit 38. In the present embodiment, the work memory 34 is a flag for inverting the voltage value (signal value) of the heartbeat waveform (hereinafter referred to as an inversion execution flag 340). ) Is stored.

  The sensor data storage memory 35 is a memory for storing an electrocardiogram waveform acquired by the heartbeat sensor 30 and a heart rate calculated from the electrocardiogram waveform. The memory 35 for storing sensor data stores a difference value V1 (see FIG. 6A) between the peak value of the S wave and the peak value of the J wave in the electrocardiographic waveform acquired by the heart rate sensor 30, and the R wave. The difference value V2 (see FIG. 6A) between the peak value and the peak value of the S wave, the value of the period T of the electrocardiogram waveform, and the value of the heart rate are accumulated and stored.

  The control unit 38 centrally controls each part of the heart rate monitor 1. Specifically, the control unit 38 expands a designated program from various programs stored in the flash memory 33, and executes various processes in cooperation with the expanded program.

[Operation]
Next, heart rate calculation processing executed by the heart rate monitor 1 will be described with reference to the drawings.

  FIG. 4 is a flowchart for explaining the operation of the heart rate calculation process. In this heart rate calculation process, when the switch 200 is turned on, the heart rate measurement program 330 is read from the flash memory 33 and appropriately expanded. As a result, the heart rate measurement program 330 and the control unit 38 cooperate. Executed by.

  As shown in FIG. 4, in the heart rate calculation process, the control unit 38 first resets the elapsed time t counted by the counter 32 to “0”, and then starts counting the elapsed time t (step S1). Then, sampling of the electrocardiographic waveform by the heart rate sensor 30 is executed (step S3). In the present embodiment, sampling is performed at a frequency of 200 Hz, for example.

  Next, the control unit 38 determines whether or not the inversion execution flag 340 is ON (step S5), and determines that it is not ON, that is, is OFF (step S5; No). Then, the process proceeds to step S9 described later. In the present embodiment, the inversion execution flag 340 is set to OFF in the default state immediately after the switch 200 is turned ON.

  On the other hand, when it determines with the reversal execution flag 340 being ON in step S5 (step S5; Yes), the control part 38 performs the reversal process which reverses the acquired electrocardiogram waveform (step S7). ). As a result, the electrocardiogram waveform acquired thereafter is inverted, so that the electrocardiogram waveform of the second mode as shown in FIG. 6B is the electrocardiogram of the first mode as shown in FIG. It will be converted into a shape.

  Next, the control part 38 performs the waveform detection process for detecting the electrocardiogram waveform of a 1st aspect from the acquired electrocardiogram waveform (step S9).

  Specifically, as shown in FIGS. 5 and 6A, in this waveform detection process, first, the control unit 38 determines whether or not a positive R wave is detected from the electrocardiographic waveform (step U1). .

  And when it determines with not having detected the positive R wave from the electrocardiogram waveform in this step U1 (step U1; No), the control part 38 complete | finishes a waveform detection process.

  On the other hand, if it is determined in step U1 that a positive R wave has been detected from the electrocardiogram waveform (step U1; Yes), the control unit 38 has a peak on the low voltage side and is negative with respect to the waveform center voltage. Whether or not an S wave having a voltage value (hereinafter referred to as a negative S wave) is detected from the electrocardiographic waveform, and a time T1 between the peak of the R wave and the peak of the S wave satisfies the first condition. (Step U3). At this time, the control unit 38 sequentially extracts five voltage values (signal values) sampled continuously at a frequency of 200 Hz from the vicinity of the R wave and the vicinity of the S wave, and the third among the five voltage values. When the absolute value of the sampled voltage value is the largest, the third voltage value is set as the peak value of the R wave or S wave, and whether or not the time T1 between the peaks is within the time range of 20 msec to 30 msec. This is used as the first condition. In this embodiment, since the sampling frequency is 200 Hz and the sampling period is 5 msec, the above first condition is (sampling period) × 4 ≦ T1 ≦ (sampling period) × 6. In other words, it means that there are 4 or more and 6 or less sampling values between the R wave peak and the S wave peak. However, the numerical value used for such a first condition may be another value. The first condition is set based on an average value of the time interval between the R wave and the S wave in a general human electrocardiogram waveform, and is shorter than the above time range caused by noise or the like. This is a condition set in order to prevent a waveform having a close peak or a waveform having a peak with a time interval longer than the above time range from being erroneously detected as an R wave or an S wave.

  In step U3, a negative S wave is not detected from the electrocardiogram waveform, or a negative S wave is detected, but the time T1 between the peak of the R wave and the peak of the S wave is the first time. When it determines with not satisfy | filling conditions (step U3; No), the control part 38 complete | finishes a waveform detection process.

  On the other hand, when a negative S wave is detected from the electrocardiogram waveform in step U3 and it is determined that the time T1 between the peak of the R wave and the peak of the S wave satisfies the first condition (step U3; Yes) ), The control unit 38 detects whether or not a J wave having a peak on the high voltage side (hereinafter referred to as a positive J wave) is detected from the electrocardiogram waveform, and between the peaks of the S wave and the J wave. It is determined whether or not the time T2 satisfies the second condition (step U5). At this time, similarly to the above-described step U3, the control unit 38 sequentially extracts five voltage values (signal values) sampled continuously at a frequency of 200 Hz from the vicinity of the S wave and the vicinity of the J wave. When the absolute value of the third sampled voltage value is the largest among the two voltage values, the third voltage value is set to the peak value of the S wave or J wave, and the time T2 between the peaks is a time from 20 msec to 30 msec. Whether it is within the range is used as the second condition. However, the numerical value used for such a second condition may be another value. This second condition is also set based on the average value of the time interval between the S wave and the J wave in a general human electrocardiogram waveform, and is shorter than the above time range caused by noise or the like. This is a condition set in order to prevent a waveform having a close peak or a waveform having a peak having a time interval longer than the above time range from being erroneously detected as a J wave.

  In step U5, the positive J wave is not detected from the electrocardiogram waveform, or the positive T wave is detected, but the time T2 between the S wave peak and the J wave peak is the second time. When it determines with not satisfy | filling conditions (step U5; No), the control part 38 complete | finishes a waveform detection process.

  On the other hand, when a positive J wave is detected from the electrocardiogram waveform in step U5 and it is determined that the time T2 between the peak of the S wave and the peak of the J wave satisfies the second condition (step U5; Yes) ), The control unit 38 determines the difference value V1 (S wave and J) between the peak value of the most recent predetermined number (for example, 10) of S waves stored in the sensor data storage memory 35 and the peak value of the J wave. (Wave difference value) average value V1ave is calculated, and a difference value V1 between the S wave and the J wave in the newly acquired electrocardiogram waveform is detected, and whether or not V1 ≧ V1ave × 0.7 is satisfied. Determine (step U7). At this time, the control unit 38 causes the sensor data storage memory 35 to accumulate and store the newly detected difference value V1 between the S wave and the J wave. If the number of difference values V1 between the S wave and the J wave stored in the sensor data storage memory 35 is less than the predetermined number, the number stored in the sensor data storage memory 35 at that time The average value of the difference values V1 is used as the average value V1ave.

  And when it determines with it not being V1> = V1ave * 0.7 in this step U7 (step U7; No), the control part 38 complete | finishes a waveform detection process.

  On the other hand, when it is determined in step U7 that V1 ≧ V1ave × 0.7 or more (step U7; Yes), the control unit 38 is the most recent predetermined number (for example, 10) stored in the sensor data storage memory 35. The average value V2ave of the difference value V2 (difference value between the R wave and the S wave) between the peak value of the R wave and the peak value of the S wave is calculated, and the R wave in the newly acquired electrocardiogram waveform And S wave difference value V2 is detected, and it is determined whether or not V2 ≧ V2ave × 0.7 (step U9). At this time, the control unit 38 causes the sensor data storage memory 35 to accumulate and store the newly detected difference value V2 between the R wave and the S wave. If the number of difference values V2 between the R wave and the S wave stored in the sensor data storage memory 35 is less than the predetermined number, the number stored in the sensor data storage memory 35 at that time The average value of the difference values V2 is used as the average value V1ave.

  And when it determines with it not being V2> = V2ave * 0.7 in this step U9 (step U9; No), the control part 38 complete | finishes a waveform detection process.

  On the other hand, when it determines with it being V2> = V2ave * 0.7 in step U9 (step U9; Yes), the control part 38 will detect that the electrocardiogram waveform of the 1st aspect was detected from the acquired electrocardiogram waveform. Judgment is made (step U11), and the waveform detection process is terminated.

  When the above waveform detection processing is completed, as shown in FIG. 4, the control unit 38 next determines whether or not the electrocardiogram waveform of the first aspect is detected in the waveform detection processing (step S11), and is detected. If it is determined that there is not (Step S11; No), the process proceeds to Step S19 described later.

  Further, when it is determined in step S11 that the electrocardiogram waveform of the first aspect has been detected (step S11; Yes), the control unit 38 cycles the predetermined waveform (for example, R wave) in the acquired electrocardiogram waveform. T is calculated, and the calculated value of the period T is accumulated and stored in the sensor data storage memory 35 (step S13).

  Next, the control unit 38 determines whether or not the period T has been calculated (step S15). If it is determined that the period T has not been calculated (step S15; No), the control unit 38 proceeds to step S19 described later.

  When it is determined that the period T has been calculated in step S15 (step S15; Yes), the control unit 38 calculates the heart rate based on the calculated period T and causes the monitor device 5 to output the heart rate. The data is stored in the sensor data storage memory 35 (step S17). If the heart rate cannot be calculated at this time, the control unit 38 causes the monitor device 5 to output the previous heart rate stored in the sensor data storage memory 35 as a newly calculated heart rate, The data is stored in the sensor data storage memory 35. Further, in order to calculate the heart rate based on the period, for example, the following equation (1) can be used.

Heart rate (BPM) = 60 [sec] / cycle [sec] (1)
In addition, as the period value used in the above equation (1), when the sensor data storage memory 35 stores a predetermined number (for example, 10) of values of the period T, the most recent predetermined number is stored. If the number of periods T stored in the sensor data storage memory 35 is less than the predetermined number, the number stored in the sensor data storage memory 35 at that time is used. The average value of the period values is used.

  Next, the control unit 38 determines whether or not the elapsed time t counted by the counter 32 is equal to or longer than a preset set time (step S19), and determines that the elapsed time t is less than the set time (step S19). No), the process proceeds to step S3 described above. Here, the set time is set to about 2 to 4 seconds, for example. This set time is set to a time during which the R wave, S wave, and J wave of the electrocardiographic waveform can be detected a plurality of times.

  When it is determined in step S19 that the elapsed time t is equal to or longer than the set time (step S19; Yes), the control unit 38 stops counting the elapsed time t by the counter 32 (step S21).

  Next, the control unit 38 determines whether or not the heart rate is newly calculated and output in step S17 described above (step S23). If it is determined that the heart rate has been output (step S23; Yes), it is inverted. The execution flag 340 is kept ON / OFF as it is (step S25), and the process proceeds to the above-described step S3. Thereafter, unless the heart rate monitor 1 is removed, the heart rate is sequentially calculated and output.

  When it is determined in step S23 that the heart rate has not been output, that is, it has not been newly calculated (step S23; No), the control unit 38 obtains the second electrocardiographic waveform acquired by the heart rate sensor 30. Assuming that the waveform includes the electrocardiographic waveform of the aspect, ON / OFF of the inversion execution flag 340 is changed (step S27), and the process proceeds to the above-described step S3. Thereby, the electrocardiogram waveform of the second mode as shown in FIG. 6B is inverted in the above-described step S7 and converted into the electrocardiogram waveform of the second mode as shown in FIG. 6A. Become.

  As described above, according to the heart rate monitor 1 of the present embodiment, as shown in FIG. 4, the period of the predetermined waveform (positive R wave in the present embodiment) in the electrocardiographic waveform of the first aspect is calculated. When the heart rate is calculated and the heart rate is not calculated, the electrocardiogram waveform acquired by the heart rate sensor 30 is inverted. Therefore, when the electrocardiogram waveform of the second mode is acquired, the second The electrocardiographic waveform of the aspect is converted into the electrocardiographic waveform of the first aspect, the waveform period in the electrocardiographic waveform of the first aspect is calculated, and the heart rate is calculated. Therefore, unlike the prior art, there is no need to prepare a process for detecting a predetermined waveform from the electrocardiographic waveform of the first aspect and a process for detecting the predetermined waveform from the electrocardiographic waveform of the second aspect. Regardless of whether the radio wave shape is a waveform including the electrocardiogram waveform of the first aspect or the waveform including the electrocardiogram waveform of the second aspect, that is, regardless of the wearing direction of the heart rate sensor 30, it is simpler than the conventional one. The heart rate can be calculated by simple processing.

  Also, as shown in steps S11 to S17 in FIG. 4 and the like, when the electrocardiogram waveform of the first aspect is not detected, the heart rate is not calculated, so the acquired electrocardiogram waveform is inverted. It will be. Therefore, when the electrocardiographic waveform of the second aspect is acquired, the heart rate can be calculated by reliably converting the electrocardiographic waveform of the second aspect into the electrocardiographic waveform of the first aspect.

  Further, as shown in steps U1 to U3 in FIG. 5 and the like, a positive R wave and a negative S wave are detected in the acquired electrocardiogram waveform, and an R wave peak and an S wave peak are detected. It is determined that the electrocardiographic waveform of the first mode is detected from the acquired electrocardiographic waveform only when the time T1 between the two satisfies the first condition (20 msec ≦ T ≦ 30 msec in the present embodiment). Therefore, it is possible to prevent the waveform due to noise from being erroneously detected as an R wave or S wave, and to accurately determine whether or not the electrocardiographic waveform of the first aspect has been detected.

  Further, as shown in steps U3 to U5 in FIG. 5 and the like, a positive J wave is detected in the acquired electrocardiogram waveform, and the time T2 between the peak of the S wave and the peak of the J wave is Only when the second condition (20 msec ≦ T2 ≦ 30 msec in the present embodiment) is satisfied, it is determined that the electrocardiographic waveform of the first aspect has been detected from the acquired electrocardiographic waveform. It is possible to prevent erroneous detection of the waveform as a J wave, and to accurately determine whether or not the electrocardiographic waveform of the first aspect has been detected.

  Also, as shown in step U7 in FIG. 5 and the like, the average value V1ave of the difference values between the most recent predetermined number (10 in the present embodiment) of the S wave peak value and the J wave peak value is calculated. Only when the difference value between the peak value of the S wave and the peak value of the J wave in the acquired electrocardiogram waveform is V1ave × 0.7 or more, the first waveform is obtained from the acquired electrocardiogram waveform. Since it is determined that the electrocardiogram waveform has been detected, it is possible to prevent erroneous detection of the peak waveform due to noise as an S wave or J wave, and to accurately determine whether or not the electrocardiogram waveform of the first aspect has been detected. can do.

  Also, as shown in step U9 in FIG. 5 and the like, an average value V2ave of the difference values between the latest predetermined number (10 in the present embodiment) of the R wave peak value and the S wave peak value is calculated. Only when the difference value between the peak value of the R wave and the peak value of the S wave in the acquired electrocardiogram waveform is V2ave × 0.7 or more, the first mode is obtained from the acquired electrocardiogram waveform. Since it is determined that the electrocardiogram waveform has been detected, it is possible to prevent erroneous detection of the peak waveform due to noise as an S wave or J wave, and to accurately determine whether or not the electrocardiogram waveform of the first aspect has been detected. can do.

  Also, as shown in step S19 of FIG. 4 or the like, whether or not the heart rate is calculated when the elapsed time counted since the heart rate sensor 30 started acquiring the electrocardiographic waveform is equal to or longer than the set time. Is determined. The set time is set to 2 to 4 seconds, and the R wave, the S wave, and the J wave of the electrocardiographic waveform can be detected a plurality of times such as 2 to 5 times, so that the measurement accuracy of the heart rate can be improved. it can.

<Modification>
Then, the modification of said embodiment is demonstrated. In addition, the same code | symbol is attached | subjected to the component similar to the said embodiment, and the description is abbreviate | omitted.

(Modification (1))
As shown in FIG. 3 described above, the heart rate 1A in the modification (1) includes a heart rate monitor main body 2A, and the flash memory 33A of the heart rate monitor main body 2A stores a heart rate measurement program 330A.

  This heart rate measurement program 330A is a program for causing the control unit 38 to execute a heart rate calculation process (see FIG. 7) described later.

Next, the operation of the heart rate 1A will be described with reference to the drawings.
FIG. 7 is a flowchart for explaining the operation of the heart rate calculation process in the modification (1).

  As shown in this figure, in the heart rate calculation process in the present modification (1), the processes in steps S29 to S30 are performed between the process in step S27 and the process in step S3 in the heart rate calculation process in the above embodiment. The elapsed time count is restarted.

  That is, after the process of step S27 is completed, the control unit 38 resets the elapsed time t counted by the counter 32 to “0” (step S29), and starts counting the elapsed time t again (step S31). ), The process proceeds to step S3.

  As described above, according to the heart rate monitor 1A of the modified example (1), the same effect as the heart rate monitor 1 in the above embodiment can be obtained, and the heart rate can be reduced as shown in steps S23 to S31 in FIG. When it is determined not to be calculated, the electrocardiographic waveform acquired thereafter is inverted and the elapsed time count is restarted. Thereby, it can respond to the case where it is worn after operating the heart rate monitor 1A, and while it is not worn, every time the elapsed time counted becomes a set time (about 2 to 4 seconds) or more, It is determined that the heart rate is not calculated, and the elapsed time count is restarted. When the heart rate monitor 1A is worn in the upward state, the period of a predetermined waveform in the electrocardiogram waveform of the first aspect is calculated, and the heart rate is calculated. On the other hand, when the heart rate monitor 1A is worn in the downward state, the elapsed time count is restarted without calculating the heart rate, and the acquired electrocardiogram waveform is inverted. When the set time is exceeded again, the acquired ECG waveform of the second mode is inverted and converted to the ECG waveform of the first mode, the waveform period in the ECG waveform of the first mode is calculated, and the heart rate is calculated. Is done. As described above, in the present modification (1), even when the heart rate monitor 1A is operated and then worn, the electrocardiogram waveform is a waveform including the electrocardiogram waveform of the first aspect or the electrocardiogram of the second aspect. Regardless of whether the waveform includes a shape or not, the heart rate can be calculated with a simpler process than in the prior art.

(Modification (2))
As shown in FIG. 3 described above, the heart rate 1B in the modification (2) includes a heart rate monitor main body 2B, and the flash memory 33B of the heart rate monitor main body 2B stores a heart rate measurement program 330B.

The heart rate measurement program 330B is a program for causing the control unit 38 to execute a heart rate calculation process (see FIG. 8) described later.

Next, the operation of the heart rate 1B will be described with reference to the drawings.
FIG. 8 is a flowchart for explaining the operation of the heart rate calculation process in the modification (2).

  As shown in this figure, in the heart rate calculation process in the modification (2), the processes in steps S51 to S57 are performed between the process in step S17 and the process in step S19 in the heart rate calculation process in the modification (1). To restart the elapsed time count.

  That is, when the process of step S17 is completed, the control unit 38 determines whether or not the two most recent heart rates stored in the sensor data storage memory 35 match, that is, whether or not the heart rate can be newly calculated. Is determined (step S51), and when it is determined that they do not match (step S51; No), the process proceeds to step S19 described above.

  On the other hand, if it is determined in step S51 that the two most recent heart rates match (step S51; Yes), the control unit 38 determines whether the elapsed time t is being counted by the counter 32, that is, It is determined whether the count is not stopped in step S21 described above (step S53).

  If it is determined in step S53 that the elapsed time t is being counted (step S53; Yes), the control unit 38 proceeds to step S19 described above.

  On the other hand, if it is determined in step S53 that the elapsed time t is not being counted (step S53; No), the control unit 38 resets the elapsed time t counted by the counter 32 to “0” (step S53). S55) After the elapsed time t is started again (step S57), the process proceeds to step S19 described above.

As described above, according to the heart rate monitor 1B of the present modification (2), it is possible to obtain the same effect as the heart rate monitor 1A in the above modification, and as shown in steps S51 to S57 in FIG. By determining whether or not the two heart rates match, it is determined whether or not the heart rate can be newly calculated. If it is determined that the latest heart rates match, the elapsed time count is reset. Be started. As a result, it is possible to cope with the case where the heart rate monitor 1B is operated and worn and then removed and then attached again. When the heart rate monitor 1B is removed, the heart rate cannot be newly calculated, and the latest Since the heart rate is determined to match, the elapsed time count is restarted. Thereafter, when the heart rate monitor 1B remains detached, it is determined that the heart rate is not calculated every time the elapsed time counted exceeds the set time (about 2 to 4 seconds), and the elapsed time is counted. Will be restarted.
When the heart rate monitor 1B is worn in the upward state, the period of a predetermined waveform in the electrocardiogram waveform of the first aspect is calculated, and the heart rate is calculated. On the other hand, when the heart rate monitor 1B is worn in the downward state, the elapsed time count is restarted without calculating the heart rate, and the electrocardiogram waveform acquired thereafter is inverted, so the counted elapsed time is When the set time is exceeded again, the acquired ECG waveform of the second mode is inverted and converted to the ECG waveform of the first mode, the waveform period in the ECG waveform of the first mode is calculated, and the heart rate is calculated. Is done.
From the above, even if the heart rate monitor 1B is operated and worn and then removed and then worn again, the electrocardiographic waveform is a waveform including the electrocardiographic waveform of the first mode or the second type of heart. Regardless of whether the waveform includes a radio wave shape, the heart rate can be calculated with a simpler process than in the prior art.

  Of course, the detailed configuration and detailed operation of each component of the heart rate monitor 1 in the above embodiment can be appropriately changed without departing from the gist of the present invention.

  For example, the information processing apparatus according to the present invention can be applied to electronic devices such as a scientific calculator, an electronic dictionary, a mobile phone, a PDA (Personal Digital Assistant), and a game machine.

  As mentioned above, although several embodiment of this invention was described, the scope of the present invention is not limited to the above-mentioned embodiment, The range of the invention described in the claim, and its equivalent range Including.

The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.
[Appendix]
<Claim 1>
A heart rate sensor that acquires an electrocardiogram of the user when worn on the chest of the user;
A heart rate calculator that calculates a heart rate based on the electrocardiogram waveform;
A waveform inversion unit for inverting the electrocardiographic waveform acquired by the heart rate sensor;
With
The electrocardiographic waveform acquired by the heart rate sensor when the heart rate sensor is worn on the chest of the user includes a first R wave having a peak on the high voltage side and the low voltage side. Including any one of the electrocardiographic waveforms of the second aspect including the second R wave having a peak at
When the electrocardiogram waveform includes the electrocardiogram waveform of the first aspect, the heart rate calculator calculates the heart rate for the electrocardiogram waveform, and the electrocardiogram waveform is the second aspect. When the electrocardiogram waveform is included, the heart rate is calculated for the inverted electrocardiogram waveform obtained by inverting the electrocardiogram waveform by the waveform inverting unit.
<Claim 2>
The heart rate monitor according to claim 1, wherein
The heart rate calculator is
An electrocardiogram waveform determination unit that determines whether the electrocardiogram waveform of the first aspect is detected from the electrocardiogram waveform acquired by the heartbeat sensor;
A heart rate monitor, wherein the heart rate is calculated when the electrocardiogram waveform determination unit determines that the electrocardiogram waveform of the first aspect is detected from the electrocardiogram waveform.
<Claim 3>
The heart rate monitor according to claim 2, wherein
The electrocardiogram waveform determination unit
In the electrocardiographic waveform acquired by the heart rate sensor, the first R wave and an S wave having a peak on a low voltage side are detected, and the peak of the first R wave and the S wave It is determined that the electrocardiographic waveform of the first aspect is detected from the acquired electrocardiographic waveform when the time from the peak is 20 msec to 30 msec.
<Claim 4>
The heart rate monitor according to claim 3,
The electrocardiogram waveform determination unit
A J wave having a peak on the high voltage side is detected in the electrocardiographic waveform acquired by the heart rate sensor, and a time between the peak of the S wave and the peak of the J wave is 20 msec to 30 msec. In this case, it is determined that the electrocardiographic waveform of the first aspect is detected from the acquired electrocardiographic waveform.
<Claim 5>
The heart rate monitor according to claim 4, wherein
The electrocardiogram waveform determination unit further includes
A first storage unit for accumulating and storing a difference value between the peak value of the S wave and the peak value of the J wave in the electrocardiographic waveform acquired by the heart rate sensor as a first voltage;
An average value of the most recent predetermined number of the first voltages stored in the first storage unit is calculated as a first average value, and the S wave and the J wave are calculated using the electrocardiographic waveform acquired by the heart rate sensor. And when the difference value between the peak value of the S wave and the peak value of the J wave is 70% or more of the first average value, It determines with the electrocardiogram waveform of the aspect having been detected, The heart rate monitor characterized by the above-mentioned.
<Claim 6> In the heart rate monitor according to claim 4 or 5,
The electrocardiogram waveform determination unit further includes
A second storage unit that accumulates and stores a difference value between the peak value of the first R wave and the peak value of the S wave in the electrocardiographic waveform acquired by the heart rate sensor as a second voltage;
An average value of the last predetermined number of the second voltages stored in the second storage unit is calculated as a second average value, and the first R wave is calculated based on the electrocardiographic waveform acquired by the heart rate sensor. And the S wave are detected, and the difference between the peak value of the first R wave and the peak value of the S wave is 70% or more of the second average value, the acquired heart It is determined that the electrocardiographic waveform of the first aspect is detected from a radio wave shape.
<Claim 7>
In the heart rate monitor as described in any one of Claims 1-6,
A counting unit that counts an elapsed time since the heart rate sensor started acquiring the electrocardiogram waveform;
The waveform inverting unit
When the elapsed time counted by the counting unit is equal to or longer than a set time including two or more ECG waveforms of the first aspect or the second aspect, the heart rate calculating unit A heart rate monitor characterized by determining whether or not it has been calculated.
<Claim 8>
The heart rate monitor according to claim 7,
The waveform inverting unit
When it is determined that the heart rate is not calculated by the heart rate calculation unit, the first electrocardiogram waveform acquired by the heart rate sensor is inverted, and the count of the elapsed time by the counting unit is restarted. A heart rate monitor having a start part.
<Claim 9>
The heart rate monitor according to claim 8, wherein
The heart rate calculator sequentially calculates the heart rate,
The heart rate monitor
Among the heart rates calculated by the heart rate calculation unit, at least two heart rates calculated most recently are stored, and when the heart rate is not calculated by the heart rate calculation unit, the heart rate calculated last time , As a newly calculated heart rate,
A heart rate coincidence detection unit that determines whether or not the two most recent heart rates stored by the heart rate storage unit coincide;
A second restarting unit for restarting counting of elapsed time by the counting unit when it is determined by the heartbeat matching detecting unit that the two most recent heart rates match;
A heart rate monitor comprising:
<Claim 10>
In the heart rate measurement method in the heart rate monitor that is worn on the chest of the user and measures the heart rate,
The heart rate monitor acquires the electrocardiographic waveform of the user when worn on the chest of the user, and the acquired electrocardiographic waveform includes a first R wave having a peak on the high voltage side. A heart rate sensor including any one of an electrocardiogram waveform and an electrocardiogram waveform of the second aspect including a second R wave having a peak on the low voltage side;
When the electrocardiogram waveform acquired by the heart rate sensor includes the electrocardiogram waveform of the first aspect, the heart rate is calculated for the electrocardiogram waveform,
When the electrocardiogram waveform includes the electrocardiogram waveform of the second aspect, an inverted electrocardiogram waveform obtained by inverting the electrocardiogram waveform is generated, and the heart rate is calculated for the inverted electrocardiogram waveform. ,
A heart rate measurement method characterized by this.
<Claim 11>
In a heart rate measurement program executed by a computer as a heart rate meter that is worn on the user's chest and measures the heart rate,
The heart rate monitor acquires the electrocardiographic waveform of the user when worn on the chest of the user, and the acquired electrocardiographic waveform includes a first R wave having a peak on the high voltage side. A heart rate sensor including any one of an electrocardiogram waveform and an electrocardiogram waveform of the second aspect including a second R wave having a peak on the low voltage side;
The heart rate measurement program
In the heart rate monitor,
When the electrocardiographic waveform acquired by the heart rate sensor includes the electrocardiographic waveform of the first aspect, the heart rate is calculated based on the electrocardiographic waveform,
When the electrocardiogram waveform includes the electrocardiogram waveform of the second aspect, an inverted electrocardiogram waveform is generated by inverting the electrocardiogram waveform, and the heart rate is calculated for the inverted electrocardiogram waveform. ,
A heart rate measurement program characterized by this.

1, 1A, 1B Heart rate monitor 20 Housing 30 Heart rate sensor 32 Counter 35 Sensor data storage memory 38 Control unit

Claims (9)

A heart rate sensor for acquiring a user's electrocardiogram waveform;
A counting unit that counts an elapsed time since the heartbeat sensor started acquiring the electrocardiogram waveform;
A heart rate calculation unit that calculates a heart rate based on the electrocardiogram waveform acquired during the elapsed time;
A waveform inversion unit for inverting the electrocardiographic waveform acquired by the heart rate sensor;
With
The electrocardiographic waveform includes an electrocardiographic waveform of the first aspect including a first R wave having a peak on the high voltage side and a second electrocardiographic waveform including a second R wave having a peak on the low voltage side. Including either one,
When the electrocardiogram waveform includes the electrocardiogram waveform of the first aspect, the heart rate calculator calculates the heart rate for the electrocardiogram waveform, and the electrocardiogram waveform is the second aspect. The above heart rate is not calculated when the ECG waveform is included,
When the elapsed time by the counting unit is equal to or longer than a set time set to a time during which a plurality of the first R waves or the second R waves can be detected, the heart rate calculation unit When the heart rate is not calculated, the ECG waveform acquired by the heart rate sensor is inverted thereafter, and the ECG waveform is inverted by the waveform inversion unit. The heart rate is calculated by the heart rate calculation unit. The heart rate monitor according to claim 1, wherein
The set time is set to 2 to 4 seconds,
The heart rate calculator is
An electrocardiogram waveform determination unit that determines whether the electrocardiogram waveform of the first aspect is detected from the electrocardiogram waveform acquired by the heartbeat sensor;
A heart rate monitor, wherein the heart rate is calculated when the electrocardiogram waveform determination unit determines that the electrocardiogram waveform of the first aspect is detected from the electrocardiogram waveform. The heart rate monitor according to claim 2, wherein
The electrocardiogram waveform determination unit
In the electrocardiographic waveform acquired by the heart rate sensor, the first R wave and an S wave having a peak on a low voltage side are detected, and the peak of the first R wave and the S wave It is determined that the electrocardiographic waveform of the first aspect is detected from the acquired electrocardiographic waveform when the time from the peak is 20 msec to 30 msec. The heart rate monitor according to claim 3,
The electrocardiogram waveform determination unit
A J wave having a peak on the high voltage side is detected in the electrocardiographic waveform acquired by the heart rate sensor, and a time between the peak of the S wave and the peak of the J wave is 20 msec to 30 msec. In this case, it is determined that the electrocardiographic waveform of the first aspect is detected from the acquired electrocardiographic waveform. The heart rate monitor according to claim 4, wherein
The electrocardiogram waveform determination unit further includes
A first storage unit for accumulating and storing a difference value between the peak value of the S wave and the peak value of the J wave in the electrocardiographic waveform acquired by the heart rate sensor as a first voltage;
An average value of the most recent predetermined number of the first voltages stored in the first storage unit is calculated as a first average value, and the S wave and the J wave are calculated using the electrocardiographic waveform acquired by the heart rate sensor. And when the difference value between the peak value of the S wave and the peak value of the J wave is 70% or more of the first average value, It is determined that the electrocardiographic waveform of the aspect is detected. The heart rate monitor according to claim 4 or 5,
The electrocardiogram waveform determination unit further includes
A second storage unit that accumulates and stores a difference value between the peak value of the first R wave and the peak value of the S wave in the electrocardiographic waveform acquired by the heart rate sensor as a second voltage;
An average value of the last predetermined number of the second voltages stored in the second storage unit is calculated as a second average value, and the first R wave is calculated based on the electrocardiographic waveform acquired by the heart rate sensor. And the S wave are detected, and the difference between the peak value of the first R wave and the peak value of the S wave is 70% or more of the second average value, the acquired heart It is determined that the electrocardiographic waveform of the first aspect is detected from a radio wave shape. The heart rate monitor according to claim 1, wherein
The heart rate calculation unit sequentially calculates the heart rate,
Among the heart rates calculated by the heart rate calculating unit, at least two heart rates calculated at the latest are stored, and when the heart rate is not calculated by the heart rate calculating unit, the heart rate calculated last time A heart rate storage unit for storing the number as a newly calculated heart rate;
Determining whether the two most recent heart rates stored by the heart rate storage unit match,
A heart rate monitor characterized by restarting counting of elapsed time by the counting unit when it is determined that the two most recent heart rates coincide with each other. In a heart rate measurement method in a heart rate meter that measures heart rate,
The heart rate meter acquires a user's electrocardiogram waveform, and the acquired electrocardiogram waveform includes a first R wave having a peak on the high voltage side and a peak on the low voltage side. A heart rate sensor including any one of the electrocardiographic waveforms of the second aspect including the second R wave,
When the electrocardiographic waveform acquired by the heart rate sensor includes the electrocardiographic waveform of the first aspect, based on the electrocardiographic waveform acquired during the elapsed time from the start of acquisition of the electrocardiographic waveform. When the heart rate is calculated and the electrocardiogram waveform includes the electrocardiogram waveform of the second aspect, the heart rate is not calculated,
When the heart rate is not calculated when the elapsed time is equal to or longer than a set time set to a time during which a plurality of the first R waves or the second R waves can be detected. Generating an inverted electrocardiogram waveform obtained by inverting the electrocardiogram waveform, and calculating the heart rate for the inverted electrocardiogram waveform,
A heart rate measurement method characterized by this. In a heart rate measurement program executed by a computer as a heart rate meter for measuring heart rate,
The heart rate meter acquires a user's electrocardiogram waveform, and the acquired electrocardiogram waveform includes a first R wave having a peak on the high voltage side and a peak on the low voltage side. A heart rate sensor including any one of the electrocardiographic waveforms of the second aspect including the second R wave,
The heart rate measurement program
In the heart rate monitor,
When the electrocardiogram waveform acquired by the heart rate sensor includes the electrocardiogram waveform of the first aspect, based on the electrocardiogram waveform acquired during the elapsed time since the acquisition of the electrocardiogram waveform was started. To calculate the heart rate,
When the electrocardiogram waveform includes the electrocardiogram waveform of the second aspect, the heart rate is not calculated,
When the heart rate is not calculated when the elapsed time is equal to or longer than a set time set to a time during which a plurality of the first R waves or the second R waves can be detected. Generating an inverted electrocardiogram waveform obtained by inverting the electrocardiogram waveform, and calculating the heart rate for the inverted electrocardiogram waveform,
A heart rate measurement program characterized by this.

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