JPH105201A - Psychological state judging system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to correctly evaluate and judge a psychological state, by amplifying and filtering electrocardiographic signals and calculating the fluctuation amount of electrocardiographic R wave intervals to evaluate and judge the psychological state. SOLUTION: When electrocardiographic data taken into an analyzing part 301 from an electrocardiograph part 200 is larger than a threshold value, the R wave interval (RR interval) is calculated from the difference of the time from that of previously exceeded the threshold value to calculate a cardiac rate and the cardiographic analysis data are displayed on an analytical data display part 302. Calculating the average and the variation of the RR interval, it is judged by a judging part 401 a concentration/tension state when the variation is small and a non-concentration/non-tension state when large, and the psychological judge result is displayed on a judge result display part 402. When a present cardiac rate is larger than a target cardiac rate, the indicated rate on a work indicating part 502 is made slower, and when smaller, made quicker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a psychological state determination device.

[0002]

2. Description of the Related Art FIG.
As shown in FIG. 1, an electrocardiographic signal detected by the sensor 100 mounted on the subject is measured by the electrocardiographic measuring unit 200, a heart rate and the like are analyzed by the electrocardiographic analyzing unit 300, and the work presenting unit 500 A general method is that the mental state of the subject during the work presented is evaluated and determined by the mental state determination unit 400.

[0003] As shown in FIG. 12, it is known that the interval (RR interval) of waves called R waves constituting an electrocardiogram is slightly different every beat even when the heart rate is constant. It is known that this amount of variation sometimes decreases. Therefore, using the fluctuation amount (fluctuation amount) of the RR interval as an index,
It is possible to evaluate and determine a psychological state such as the degree of concentration / strain of the subject.

[0004]

However, the RR interval also changes as the heart rate increases or decreases. For this reason, in the psychological state determination during work involving a change in heart rate (eg, determination of the degree of concentration during exercise), whether the cause of the change in the fluctuation amount is a change in the mental state (eg, concentration / strain), There was a problem that it was not possible to distinguish whether the change was due to fluctuations, and the evaluation judgment of the psychological state could not be correctly performed.

The present invention has been made in view of such conventional problems, and solves this problem by controlling the workload so that the heart rate becomes constant.

[0006]

According to the present invention, there is provided an electrocardiogram detecting means for detecting an electrocardiogram of a human body.
A measuring means for amplifying and filtering an electrocardiographic signal detected by the electrocardiographic detecting means; a means for calculating a fluctuation amount of an R-wave interval of the electrocardiogram from an output of the measuring means; Means, means for calculating a heart rate from the output of the measuring means, and means for controlling a workload based on the value of the heart rate.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a basic configuration diagram of the present invention, wherein a sensor 100 for detecting an electrocardiogram and an electrocardiogram measuring section 2 are provided.
00, an electrocardiographic analysis unit 300, a psychological state determination unit 400, and a work presentation unit 500.

FIG. 2 shows a basic operation flow of the present invention. ● Electrocardiographic analysis (block diagram 300) f-1-100 The heart rate is calculated from the measured electrocardiographic signal, and its fluctuation is examined. ● Workload control (block diagram 500) f-1-400 When the target heart rate and the current heart rate are the same, the work amount is kept as it is. f-1-200, f-1-500 When the current heart rate is higher than the target heart rate, the work amount is reduced by a certain amount. f-1-300, f-1-600 When the current heart rate is smaller than the target heart rate, the work amount is increased by a certain amount.

F-1-700 The above operation is repeated. ● Judgment of mental state (block diagram 400) f-1-800 RR interval is calculated and its variation is examined. f-1-900, f-1-1000 A psychological state determination corresponding to the RR interval fluctuation is performed. Example: RR interval fluctuation small → concentration / tension state RR interval fluctuation large → non-concentration / non-tension state By keeping the heart rate constant by the above operation, RR interval fluctuation due to heart rate fluctuation can be eliminated, and concentration / tension etc. RR interval fluctuation due to a change in the mental state of the user can be detected.

(First Embodiment) FIG. 3 is a diagram showing a first embodiment of the present invention.

The present embodiment is a mental workload operation in which the subject responds to an instruction presented on a task display unit installed in front of the subject. The amount of workload is controlled by changing the speed at which the instruction is presented. A constant heartbeat state is obtained, and under these conditions, the concentration / tension state is evaluated based on the RR interval. The part for measuring the reaction of the subject is omitted because it is different from the present invention.

Reference numeral 100 denotes a sensor for detecting an electrocardiogram;
Is an electrocardiogram measuring unit, which comprises an amplifier 201 and a filter 202. Reference numeral 300 denotes an electrocardiogram analysis unit which includes an analysis unit 301 and an analysis result display unit 302. 400 is an electrocardiogram analysis unit 300
This is a psychological state determination unit that determines a mental state based on the analysis result, and includes a determination unit 401 and a determination result display unit 402.
Reference numeral 500 denotes a work presentation unit that presents a work to the subject, and includes a work load control unit 501 and a work display unit 502.

Next, the operation will be described. ● Calculation of heart rate and RR interval (block diagrams 300, 4 and 6) f-2-100 The electrocardiographic data V [t] taken into the analyzer 301 is compared with a preset threshold Th. . f-2-200, f-2-300, f-2-400, f
-2-500 When the electrocardiogram data V [t] is larger than the threshold value Th, the time R [i] of the electrocardiogram data V [t] is used, and the time R [i-1] at which the electrocardiogram data last exceeded Th. RR interval R
Calculate RI [i]. RRI [i] = R [i] -R [i-1] f-2-700 The heart rate B [i] is calculated from the following equation, and the workload control operation is performed. B [i] = 60 / RRI [i] The electrocardiographic analysis result analyzed by the above operation is displayed on the analysis result display unit 302. Note that B [i] may use an average value of an arbitrary section. ● Psychological state judgment (block diagram 400, FIG. 6) f-2-600, f-2-800, f-2-900 The average value and the variance value RRV of the RRI are calculated from the N RRI values, and the variance value is calculated. More concentration level judgment is performed. Judgment example: small variance value → concentration / strain state Large variance value → non-concentration / non-stress state f-2-1000 The above operation is repeated. The mental state determination result determined by the above operation is displayed on the determination result display unit 402. ● Workload control (block diagrams 500, 5, and 7) f-3-100 The current heart rate B [i] is compared with the target heart rate Bt. f-3-400 If B [i] = Bt, the presentation speed V is left as it is. f-3-200, f-3-500 If B [i]> Bt, the presentation speed is set to V = V−Vd, and the presentation speed is reduced to reduce the amount of work and reduce the heart rate. f-3-300, f-3-600 If B [i] <Bt, the presentation speed is set to V = V + Vd, and by increasing the presentation speed, the amount of work is increased and the heart rate is increased. f-3-700 The heart rate is kept constant by repeating the above operation. FIG.
FIG. 9 shows an example of experimental load control and heart rate change in this embodiment. By the above operation, the heart rate during the work is kept constant, and the RRV fluctuation due to the heart rate fluctuation is removed.
Only the RRV fluctuation due to the mental state change can be detected, and a more accurate mental state determination result can be obtained.

(Second Embodiment) FIG. 8 is a diagram showing a second embodiment of the present invention. The present embodiment is a physical load operation for controlling a pedal load of a bicycle ergometer for training. The weight of the pedal depression force is used to control the amount of the work load so as to maintain a constant heartbeat state, and a psychological state due to RR interval fluctuation during driving. A condition evaluation is performed. The description of the method of generating the pedal effort is omitted. 100 is a sensor for detecting an electrocardiogram, 200 is an electrocardiogram measuring unit and an amplifier 2
01 and a filter 202. Reference numeral 300 denotes an electrocardiogram analysis unit which includes an analysis unit 301 and an analysis result display unit 302. Reference numeral 400 denotes a mental state determination unit that determines a mental state based on the analysis result of the electrocardiographic analysis unit 300, and includes a determination unit 401 and a determination result display unit 402. Reference numeral 500 denotes a work presentation unit that applies a physical load, and includes a work load control unit 503 and a bicycle ergometer 504. Reference numeral 600 denotes a display unit that presents a mental state determination result to the subject.

Next, the operation will be described. Since the heart rate and the RRV calculation operation are the same as in the first embodiment, they will not be described. ● Workload control (block diagrams 500, 9 and 10) f-3-100 The current heart rate B [i] is compared with the target heart rate Bt. f-3-400 If B [i] = Bt, the pedal load L remains unchanged. f-3-200, f-3-500 If B [i]> Bt, the pedal load is set to L = L−Ld,
Lightening the pedal load reduces the amount of work and reduces heart rate. f-3-300, f-3-600 If B [i] <Bt, the pedal load is set to L = L + Ld,
Increasing the pedal load increases the amount of work and increases the heart rate. f-3-700 The heart rate is kept constant by repeating the above operation. FIG.
FIG. 9 shows an example of experimental load control and heart rate change in this embodiment. By the above operation, by keeping the heart rate during exercise constant and removing the RRV fluctuation due to the heart rate fluctuation,
Only RRV fluctuation due to concentration / strain during exercise can be detected, and psychological evaluation during exercise can be performed.

[0017]

According to the present invention described above, since the RR interval fluctuation due to the heart rate fluctuation can be removed by controlling the workload so that the heart rate is kept constant, the cause of the RR interval fluctuation is the psychological state. It can be specified as a change. For this reason, as in the conventional example, it is not possible to distinguish whether the cause of the RR interval fluctuation is due to the heart rate fluctuation or the mental state change, and the mental state determination cannot be correctly performed.
Problem can be solved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of the present invention.

FIG. 2 is a diagram showing a basic operation flow of the present invention.

FIG. 3 is a block diagram showing a first embodiment of the present invention.

FIG. 4 is a diagram showing a heart rate calculation method.

FIG. 5 is a diagram showing an example of experimental load control and a change in heart rate in the present embodiment.

FIG. 6 is a diagram illustrating a heart rate and RRV calculation flow according to the first embodiment.

FIG. 7 is a diagram illustrating a work load control flow according to the first embodiment.

FIG. 8 is a block diagram showing a second embodiment of the present invention.

FIG. 9 is a diagram illustrating an example of experimental load control and a change in heart rate according to the second embodiment of the present invention.

FIG. 10 is a diagram illustrating a work load control flow according to the second embodiment.

FIG. 11 is a diagram showing a configuration of a conventional mental state evaluation device.

FIG. 12 is a diagram showing an electrocardiogram.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 electrocardiographic sensor 200 electrocardiographic measuring unit 201 amplifier 202 filter 300 electrocardiographic analyzing unit 301 analyzing unit 302 analysis result displaying unit 400 psychological state determining unit 401 determining unit 402 determining result displaying unit 500 work presenting unit 501 work load controlling unit 502 work Display unit 503 Work load control unit 504 Bicycle ergometer 600 Judgment result display unit

Claims (6)

[Claims] 1. An electrocardiogram detecting means for detecting an electrocardiogram of a human body; a measuring means for amplifying and filtering an electrocardiographic signal detected by the electrocardiographic detecting means; Means for calculating a fluctuation amount; means for evaluating and determining a psychological state based on the fluctuation amount; means for calculating a heart rate from the output of the measuring means; and means for controlling a workload amount based on the value of the heart rate. A psychological state determination device characterized by having. 2. The psychological state determination device according to claim 1, wherein the workload is reduced as the heart rate increases. 3. The psychological state determining device according to claim 1, wherein the workload is increased as the heart rate decreases. 4. The mental state determining apparatus according to claim 1, wherein the workload is controlled so that the heart rate becomes a target heart rate. 5. The psychological state determining apparatus according to claim 1, further comprising: means for controlling a mental workload. 6. The psychological condition judging device according to claim 1, further comprising: means for controlling a physical workload.