Mortimer J A, Eisenberg P, Palmer S S
Geriatric Research, Education, and Clinical Center, Veterans Administration Medical Center, Minneapolis, Minnesota 55417.
Exp Neurol. 1987 Dec;98(3):542-54. doi: 10.1016/0014-4886(87)90263-9.
Electromyographic silent periods (premovement silence) preceding the initial agonist burst were studied in 11 healthy subjects who performed rapid forearm flexions and extensions. Premovement silence occurred with higher frequency during self-paced movements when subjects produced maximum power efforts than during a reaction time paradigm. The occurrence and duration were significantly correlated with the peak acceleration of the movement. Premovement silence occurred specifically in those muscles involved in the intended movement, often in several synergists with different latencies and durations. The shortest latency of premovement silence was considerably briefer than that of the earliest voluntary increase in EMG. The findings suggest that premovement silence may increase peak muscular force by bringing motoneurons into a nonrefractory state prior to their activation. The fact that it occurred on some, but not all, trials within single subjects and had a variable duration from trial to trial suggests that it may be a learned, rather than automatic, motor response.
对11名进行快速前臂屈伸的健康受试者，研究了初始主动肌爆发之前的肌电图静息期（运动前静息）。当受试者在自定节奏运动中进行最大功率努力时，运动前静息出现的频率高于反应时范式。其出现和持续时间与运动的峰值加速度显著相关。运动前静息特别发生在参与预期运动的那些肌肉中，通常在几个具有不同潜伏期和持续时间的协同肌中。运动前静息的最短潜伏期比最早的肌电图自愿增加的潜伏期短得多。研究结果表明，运动前静息可能通过在运动神经元激活之前使其进入非不应期状态来增加肌肉峰值力量。它在单个受试者的一些但不是所有试验中出现，并且每次试验的持续时间可变，这一事实表明它可能是一种习得的而非自动的运动反应。
