EMG-reaction times (EMG-RTs) of the biceps brachii for the elbow flexion and the supination were measured on 46 gymnastic male students under conditions with and without a warning signal. Analysis indicated that the difference in EMG-RTs between the movement patterns was observed under both conditions; the warning signal could reduce EMG-RTs in proportion to the length of EMG-RT without warning; and this trend was more remarkable on supination.
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