In an analysis of the influence of the preparatory process on motor output by measuring the EMG latencies of synergic muscles for elbow flexion and forearm supination the optimum foreperiod was between 2.0 and 2.2 sec., and a specific effect on movement pattern was not observed. However, reduction in EMG-RTs was larger in forearm supination than in elbow flexion. Those results reconfirmed previous reports.
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