Muscle condition measurement sheet

Abstract

An object of the present disclosure is to provide a muscle condition measurement sheet that can quantitatively detect the amplitude and latency of an evoked electromyogram EMG or an evoked mechanomyogram MMG and correctly evaluate the state of activity of a muscle. A pair of stimulating electrodes and all myoelectric detection electrodes come into intimate contact with a body surface of a muscle, appearing on a back surface of an insulating sheet spaced at predetermined intervals; accordingly, the relative position between an electrical stimulation position and the myoelectric detection electrode is fixed and the amplitude and latency of the evoked electromyogram EMG can be quantitatively detected without depending on the stimulation position of an electrical stimulation signal.

Description

technical field [0001] The present invention relates to a muscle state measurement sheet for use in an evaluation system for evaluating the activity state of skeletal muscles based on muscle action potentials induced by nerve stimulation. Background technique [0002] An evaluation system is known that generates an activity potential when skeletal muscle is stretched and contracted by nerve stimulation from the brain, and conventionally detects the activity potential, and evaluates muscle activity based on the waveform of the activity potential, that is, an electromyogram (EMG). An abnormal, fatigued state. However, when the activity potential is detected while stretching the skeletal muscle, the electrical signal generated by stimulation from the brain and the activity potential generated by the muscle during exercise load are included as noise, so that the activity state of the muscle cannot be evaluated stably. [0003] Therefore, an evaluation system has been proposed i...

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Problems solved by technology

[0010] However, in any of the evaluation systems described in Patent Document 1 to Patent Document 3, the stimulation position where the electrical stimulation signal is applied to the muscle to be evaluated is not clear, and in addition, the myoelectric detection electrode and the acceleration sensor for detecting the induced muscle sound are not combined with each other. The position of the body surface separated by a predetermined interval from the stimulation position is closely attached, so the amplitude and distal latency of the evoked electromyogram EMG or evoked myophonogram MMG cannot be quantitatively detected to evaluate the correct muscle activity state.

[0011] In particular, in the evaluation system of Patent Document 3, the electrical stimulation signal cannot be applied at a fixed position during exercise, so the load and the activity state of the muscle cannot be evaluated while applying a load to the muscle, and the muscle movement cannot be observed in real time during the exercise. Changes in activity status over time

[0012] In addition, the inventors of the present application have found that when muscle fatigue increases with exercise, the propagation speed of the M-wave based on the electrical stimulation signal decreases, and there is a correlation between muscle fatigue and the propagation speed. However, the propagation speed of the M-wave depends on the The time (latency) until the M wave is detected by the myoelectric detection electrode after the application of the electrical stimulation signal and the interval between the stimulation position and the myoelectric detection electrode or the interval between the myoelectric detection electrodes are obtained. It is clear that in the conventional evaluation system, the degree of muscle fatigue caused by exercise cannot be evaluated based on the propagation speed of the M wave

[0013] In addition, the muscle to be measured is located below the body surface, so the electromyography detection electrode cannot be closely attached to the body surface along the muscle fiber, so that an accurate evoked electromyogram cannot be obtained.

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