Abstract
The “silent period” was used to be defined as that period of cessation of muscle electrical activity which occurs when a twitch contraction is superimposed upon a voluntary effort. The silent period has been studied in a variety of muscles in man. The object of this study was to compare the latency of the tendon jerk and of the silent period of the biceps brachii and the triceps brachii. The tendon jerk and the silent period of these muscles were evoked by tendon percussion with the hammar which we designed and marked. Twelve young normal females, aged 19-20(19.3±0.5) years, 157.3±4.8cm heights, were used in this study of the silent period. And twelve remains(for anatomy) were used to measure the length of the biceps brachii and the triceps brachii by the scale of millimeter dimension. The present study indicated that (1) difference in the latency of tendon jerk in the biceps brachii and the triceps brachii was not significant, but (2) the latency of the silent period in the biceps brachii was significantly longer than that of the triceps brachii muscle, and (3) the length of the biceps brachii was significantly longer than that of the triceps brachii of remains.
