The relationship of muscular peak changes with accuracy in an over-arm throwing task

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Many studies regarding throwing tasks have focused on spatial and temporal characteristics of individual muscles. However，the special relationship between muscles is not entirely clear when it comes to describing human skilled movement.The purpose of the present study was to establish the relationship betwccn accuracy in a throwing task (performance) and electromyograms (EMGs) as a measurement of coordination ability in an over-arm throwing task. We recorded surface EMGs for 17 muscles from the upper limb, trunk，and lower limb during throwing task. The task was to throw to a target，and throwing perfonmance was assessed by an accuracy score. This was conducted to examine the relationship between performance and the peak changes in each EMG. The results showed that the activity peaks of the biceps brachii， extensor digitorum， and right rectus femoris were negatively correlated with performance. Regarding inter-peak periods, the difference in peak latencies between the biceps brachii and the rectus abdominis was correlated with performance，as was the difference between the flexor carpi radialis and the biceps brachii. These results show the ability of muscles to coordinate in an over-arm throwing task.

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