The present study was designed to examine the characteristics of muscle activities in a quick voluntary change in magnitude of force. 15 subjects were asked to change their magnitude of force from 50% of maximal isometric elbow-flexion strength (MVS) to 20% MVS as quickly as possible. On each EMG of biceps and triceps, a period with no muscle activity was observed. It seems that the occurrence of the pause in muscle activity on EMG contributes to more quick change in magnitude of exerted force.
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