WO2002094091A1 - Dispositif de controle de fatigue et procede d'evaluation de fatigue - Google Patents

Dispositif de controle de fatigue et procede d'evaluation de fatigue Download PDF

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Publication number
WO2002094091A1
WO2002094091A1 PCT/JP2001/010197 JP0110197W WO02094091A1 WO 2002094091 A1 WO2002094091 A1 WO 2002094091A1 JP 0110197 W JP0110197 W JP 0110197W WO 02094091 A1 WO02094091 A1 WO 02094091A1
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WIPO (PCT)
Prior art keywords
fatigue
vibration
frequency band
spectrum
band component
Prior art date
Application number
PCT/JP2001/010197
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English (en)
Japanese (ja)
Inventor
Kazuyoshi Sakamoto
Original Assignee
Kazuyoshi Sakamoto
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kazuyoshi Sakamoto filed Critical Kazuyoshi Sakamoto
Priority to JP2002590816A priority Critical patent/JPWO2002094091A1/ja
Publication of WO2002094091A1 publication Critical patent/WO2002094091A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/16—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813—Specially adapted to be attached to a specific body part
    • A61B5/6824—Arm or wrist

Definitions

  • the present invention relates to a fatigue inspection device and a fatigue evaluation method.
  • Tremors are unconscious mechanical vibrations with small amplitudes that are invisible to the eye.
  • a document by the present inventors (“On the Mechanism of Tremor Occurrence”, Proceedings of the Conference on Biomechanisms, pp. 31-34, Kazuyoshi Sakamoto, et al., July 12, 1989--12 As described in (3), studies are being conducted to measure the location and degree of injury using the frequency characteristics of tremor caused by pathological causes.
  • the inventor has found that the degree of human fatigue can be measured using the vibration characteristics of tremor.
  • the present invention has been made based on the above findings, and has as its object to provide a fatigue inspection apparatus and a fatigue evaluation method capable of measuring the degree of human fatigue by relatively simple means. Disclosure of the invention
  • the fatigue inspection device includes a detection unit that detects vibration of tremor in a body part of the subject, and an analysis unit that analyzes a spectrum of the vibration.
  • the fatigue inspection device according to claim 2 is the device according to claim 1, wherein the vibration is , Acceleration.
  • the fatigue detection device according to claim 3, according to claim 1, wherein the analysis unit outputs data including a high-frequency band component and a Z or low-frequency band component in the vibration spectrum.
  • the configuration was adopted.
  • the fatigue inspection apparatus wherein the analysis unit is configured to determine a high frequency band component and a low frequency band component in a total power of a spectrum of the vibration. It is configured to output the ratio.
  • the fatigue inspection apparatus according to claim 5, wherein the detection unit is an acceleration sensor according to any one of claims 1 to 4.
  • the fatigue inspection apparatus wherein the threshold for separating the high frequency band component and the low frequency band component is set to a high frequency side in the vibration spectrum. And the average value of the peak frequencies on the low frequency side or near it.
  • the fatigue evaluation method further comprising: acquiring a vibration spectrum of a tremor in a body part of the subject, and evaluating the fatigue state of the subject based on the vibration spectrum. Has become.
  • the fatigue evaluation method further comprising: obtaining a vibration spectrum of a tremor in a body part of the subject, and converting the vibration spectrum into a value of a high frequency band component Z or a value of a low frequency band component.
  • the fatigue evaluation method according to claim 9, wherein the fatigue state of the subject is evaluated based on the threshold value that separates the high-frequency band component from the low-frequency band component. The average value of the peak frequencies on the high frequency side and the low frequency side in the vibration spectrum or a value close to the average value.
  • FIG. 1 is a view for explaining the knowledge that is the premise of the fatigue evaluation method according to the present invention.
  • FIG. 1 is a view for explaining the knowledge that is the premise of the fatigue evaluation method according to the present invention.
  • FIG. 2 is a graph for explaining the findings obtained by the inventor, and shows a change in the upper limb tremor vector when a load is applied.
  • the horizontal axis represents frequency
  • the vertical axis represents power spectrum.
  • FIG. 3 is a graph for explaining the findings obtained by the present inventors.
  • the tremor power spectrum is shown when the upper limb is unloaded in air and when immersed in water.
  • the horizontal axis represents frequency
  • the vertical axis represents power spectrum.
  • FIG. 4 is a graph for explaining the findings obtained by the present inventors.
  • the horizontal axis represents the magnitude of the load, and the vertical axis represents the relative total power when the value at no load is set to 1. It is.
  • FIG. 5 is a graph for explaining the findings obtained by the present inventors, and shows the change in the spectrum content of the upper limb tremor spectrum by band during load application. .
  • the horizontal axis indicates the magnitude of the load
  • the vertical axis indicates the ratio of the high frequency band component to the low frequency band component in the total power.
  • FIG. 6 is a schematic block diagram of the fatigue evaluation device according to one embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
  • the parts that can be measured for tremor include the fingers, hands, forearms, upper limbs, feet, lower legs, lower limbs, head, and trunk.
  • upper limb tremor is measured using the upper limb part of the body part as an example.
  • a load (weight) 2 is attached from the elbow joint of the right arm 1 of the subject sitting on the chair to the forearm.
  • Load 2 between subjects In order to keep the load intensity constant, the maximum voluntary contraction strength (hereinafter referred to as “MVC” for Maximum Voluntary Contraction) was measured for each subject in advance, and 5%, 10%, 15% %, 20% MVC and zero external load (sometimes referred to as “no load” or “postural” in this specification).
  • MVC maximum voluntary contraction strength
  • Load 2 is mounted midway between the wrist and the elbow. It is desirable to attach load 2 so that it does not move with respect to arm 1.
  • an acceleration sensor 3 is attached near the wrist of the arm 1.
  • the acceleration sensor for example, MT-3T manufactured by Nihon Kohden can be used. The subject puts his arm vertically and forward with respect to the trunk, and stretches out with the pronation turned (the entire upper limb is twisted inward and the hand is horizontal to the ground). Keep your wrists and fingers relaxed to avoid the effects of the tremor ( Figure 1).
  • the subject keeps the same posture for a certain period of time (usually 1 minute) while visually observing the subject so that the arm 1 does not deviate from the marker 4 (visual feedback). Then, the vibration of the tremor is acquired by the acceleration sensor 3 while maintaining the visual feedback.
  • This data was subjected to Fourier transform to obtain a power spectrum.
  • the subjects in this experiment were 10 males (average age 23.4 years). As data, the average value among all subjects was adopted.
  • Figure 2 shows the results of the experiment.
  • the vibration here is based on acceleration only. It can be seen that the spectrum has a high-frequency peak and a low-frequency peak. The peak of upper limb tremor increased as the load increased. In particular, the tendency was strong at the high frequency peak.
  • the magnitude of the high frequency peak corresponds to the magnitude of the cerebral fatigue
  • the magnitude of the low frequency peak corresponds to the magnitude of the spinal cord fatigue. It turns out that it corresponds.
  • the high-frequency component works as the spinal system
  • the low-frequency component works as the cerebrum
  • the function of the frequency component is opposite to that of upper limb tremor.
  • the acceleration component increases. Therefore, the increase in the power spectrum of the 10 Hz component in Fig. 2 means that the origin of the 1 OH z component of upper limb tremor is caused by the function of the cerebrum. Is shown experimentally. Here, it is considered that the reason why the 3 Hz component also increased was that the function of the cerebrum affected the spinal cord, which is a subordinate mechanism.
  • TP total power
  • the average (solid circle in Fig. 4) and standard deviation (vertical bar in Fig. 4) of the relative values of all subjects were calculated and displayed in Fig. 4.
  • the “*” and “**” marks in the figure indicate the difference between the no-load and the relative total power under other load weights statistically tested (t-test for paired data). This indicates that there is a statistical difference (significant difference) between 1% and 1%.
  • the load on skeletal muscle can be maintained for a long time at a load of 15% MVC or less, and muscle fatigue after a certain period of time at a load of 15% MVC or more. Always happens.
  • the results in Fig. 4 show that the total power value increases sharply above 15% MVC, explaining this phenomenon.
  • the present invention is based on the above findings.
  • This fatigue testing apparatus includes a detecting unit 10 for detecting vibration of tremor, an analyzing unit 20 for analyzing a vibration spectrum, and a display unit 30 for displaying data output from the analyzing unit 20.
  • the detection unit 10 is an acceleration sensor in this embodiment.
  • An acceleration sensor similar to the acceleration sensor 1 shown in FIG. 1 can be used. You. Therefore, an output (for example, a voltage) based on the acceleration is sent from the detection unit 10 to the analysis unit 20.
  • the analysis unit 20 can be configured by a normal computer having an interface for taking in the output from the detection unit 10.
  • functions in the analysis unit 20 include an AD converter that performs AD conversion on an input, a function that performs a Fourier transform on the obtained digital data to obtain a vibration spectrum, and a vibration spectrum. It is a function to acquire the status of the statue content for each band in the total part.
  • These functions can be easily implemented as software or hardware. Also, these functions may be realized by a plurality of distributed elements. In the present embodiment, the sampling time of the AD conversion is set to 10 ms.
  • the fatigue evaluation method ′ in the present embodiment will be described with reference to FIG.
  • Load 2 is also used for fatigue evaluation.
  • the load can be 5% MVC.
  • the magnitude of the load is inversely proportional to the time indicating the increase in the total power of the tremor vibration, it is advisable to apply a load of 15% MVC or more in order to perform a quick fatigue evaluation.
  • the acceleration sensor 3 as the detection unit 10 is attached to the arm 1 of the subject.
  • the analysis unit 20 analyzes the acceleration data obtained from the acceleration sensor 3.
  • the spectrum content of each band in the vibration spectrum and the total power is obtained.
  • Such a graph is displayed on the display unit 30 in an appropriate medium.
  • the frequency band of the high frequency component is set to 5 Hz to 50 Hz
  • the frequency band of the low frequency component is set to 0.5 Hz to 0.5 Hz.
  • a specific evaluation of 5 Hz is performed as follows. First, the upper extremity tremor as shown in Fig.
  • the threshold for separating the high frequency band component and the low frequency band component should be the average value of the peak frequencies (that is, two peak frequencies) on the high frequency side and the low frequency side in the vibration spectrum or in the vicinity thereof. Can be.
  • the frequency component of the tremor vibration is rationally divided into two bands, high and low, in response to frequency fluctuations due to individual differences and differences in body parts. It can be divided into components.
  • the degree of fatigue can be quantitatively indicated by using the spectrum content. This makes it possible to accurately perform fatigue evaluation.
  • the vibration is obtained as acceleration data (data indicating force) from the acceleration sensor, there is an advantage that the change of the spectrum, particularly, the increase and decrease of the high-frequency spectrum is clear.
  • the acceleration sensor is attached near the wrist of the subject to measure upper limb tremor, but may be attached to another part (for example, upper arm).
  • the tremor of various body parts may be measured by being attached to many body parts such as fingers, hands, forearms, lower legs, lower limbs, and trunk, not limited to the upper limbs.
  • any part that generates tremor may be used.
  • the frequency separating the high frequency and the low frequency fluctuates. In order to obtain this frequency, as described in this specification, an experiment is performed on a subject in advance to obtain high and low peak values.
  • the present invention it is possible to provide a fatigue inspection apparatus and a fatigue evaluation method capable of measuring the degree of fatigue of a subject with a simple configuration.

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Abstract

L'invention concerne un dispositif de contrôle de fatigue et un procédé d'évaluation de fatigue permettant de mesurer la fatigue d'une personne d'une manière relativement simple. Ledit procédé consiste à installer un capteur d'accélération sur le bras de la personne contrôlée, puis à analyser les données d'accélération obtenues du capteur d'accélération par un dispositif (20) d'analyse afin d'obtenir des spectres de vibration et le pourcentage de spectres pour chaque zone en puissance totale. En ce qui concerne le tremblement des membres supérieurs, lorsque les composants de la zone de haute fréquence sont grands dans les spectres de vibration, la fatigue peut être estimée grande dans le système cérébral, et lorsque les composants de la zone de faible fréquence sont grands, la fatigue peut être estimée grande dans le système médullaire, l'état de fatigue pouvant ainsi être évalué correctement.
PCT/JP2001/010197 2001-05-22 2001-11-22 Dispositif de controle de fatigue et procede d'evaluation de fatigue WO2002094091A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002590816A JPWO2002094091A1 (ja) 2001-05-22 2001-11-22 疲労検査装置および疲労評価方法

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JP2001152664 2001-05-22
JP2001-152664 2001-05-22

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007138930A1 (fr) * 2006-05-29 2007-12-06 Sharp Kabushiki Kaisha dispositif d'estimation de fatigue et appareil Électronique COMPORTant le dispositif d'estimation de fatigue montÉ sur celui-ci
JP2011182824A (ja) * 2010-03-04 2011-09-22 Oki Electric Industry Co Ltd 行動状態推定装置、行動状態学習装置、行動状態推定方法、行動状態学習方法およびプログラム
JP2017169987A (ja) * 2016-03-25 2017-09-28 ムノガプローフィリナエ プレドプリヤーチェ エルシス 精神生理学的状態についての情報取得方法
EP2790579B1 (fr) * 2011-12-12 2021-03-31 AusHealth Corporate Pty Ltd Appareil destiné à la détection de l'apparition d'une hypoglycémie
WO2021157026A1 (fr) * 2020-02-06 2021-08-12 株式会社竹中土木 Dispositif de détermination et dispositif de commande de posture

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09238908A (ja) * 1996-03-06 1997-09-16 Seiko Epson Corp リラックス度測定装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09238908A (ja) * 1996-03-06 1997-09-16 Seiko Epson Corp リラックス度測定装置

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007138930A1 (fr) * 2006-05-29 2007-12-06 Sharp Kabushiki Kaisha dispositif d'estimation de fatigue et appareil Électronique COMPORTant le dispositif d'estimation de fatigue montÉ sur celui-ci
US8926531B2 (en) 2006-05-29 2015-01-06 Sharp Kabushiki Kaisha Fatigue estimation device and electronic apparatus having the fatigue estimation device mounted thereon
JP2011182824A (ja) * 2010-03-04 2011-09-22 Oki Electric Industry Co Ltd 行動状態推定装置、行動状態学習装置、行動状態推定方法、行動状態学習方法およびプログラム
EP2790579B1 (fr) * 2011-12-12 2021-03-31 AusHealth Corporate Pty Ltd Appareil destiné à la détection de l'apparition d'une hypoglycémie
JP2017169987A (ja) * 2016-03-25 2017-09-28 ムノガプローフィリナエ プレドプリヤーチェ エルシス 精神生理学的状態についての情報取得方法
WO2021157026A1 (fr) * 2020-02-06 2021-08-12 株式会社竹中土木 Dispositif de détermination et dispositif de commande de posture
JPWO2021157026A1 (fr) * 2020-02-06 2021-08-12
JP7370021B2 (ja) 2020-02-06 2023-10-27 株式会社竹中土木 判定装置および姿勢制御装置

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