Aoki H, Tsukahara R, Yabe K
Department of Therapeutics, Aichi Prefectural Colony, Japan.
Eur J Appl Physiol Occup Physiol. 1989;58(4):426-32. doi: 10.1007/BF00643520.
The effects of pre-motion silent period (PSP) on dynamic force exertion were studied in ten healthy subjects performing ballistic elbow extensions. The experiments were designed to evaluate the significance of mean differences between the averaged dynamic force curves of two groups: PSP-presence groups and PSP-absence groups. The presence of PSP was judged quantitatively and automatically by means of a newly developed method using statistical analysis. The results indicated that there were two effects of PSP on dynamic force exertion: one was a reducing effect, observed prior to the movement; the other was a reinforcing effect, observed in the first part of the ballistic movement. The duration of the reinforcement was significantly correlated with the duration of the reducing effect of PSP. The findings suggested that the reinforcement of dynamic force may be produced by the pre-stretch of agonistic muscles caused by prior force reduction due to PSP occurrence. The fact that PSP plays an important role in dynamic force exertion suggests that PSP may be incorporated in the central motor control system designed to interrupt the background activity, to stretch the agonist and to reinforce the dynamic force.
在十名进行弹道式伸肘动作的健康受试者中，研究了运动前静息期（PSP）对动态力量发挥的影响。实验旨在评估两组平均动态力量曲线之间平均差异的显著性：存在PSP的组和不存在PSP的组。通过一种新开发的使用统计分析的方法，对PSP的存在进行了定量和自动判断。结果表明，PSP对动态力量发挥有两种影响：一种是在运动前观察到的减弱作用；另一种是在弹道运动的第一部分观察到的增强作用。增强作用的持续时间与PSP减弱作用的持续时间显著相关。研究结果表明，动态力量的增强可能是由于PSP出现导致先前力量减弱而引起的主动肌预拉伸所产生的。PSP在动态力量发挥中起重要作用这一事实表明，PSP可能被纳入旨在中断背景活动、拉伸主动肌和增强动态力量的中枢运动控制系统中。
