Forestier N, Nougier V
UFRAPS, Laboratoire Sport et Performance Motrice, Université Joseph Fourier-Grenoble, France.
Neurosci Lett. 1998 Aug 21;252(3):187-90. doi: 10.1016/s0304-3940(98)00584-9.
The purpose of the present experiment was to investigate the adaptation to fatigue in a multijoint movement. The subjects' task was to throw a ball towards one of three targets in two conditions of no fatigue and fatigue. Results showed that the number of successful trials decreased with fatigue. Analysis of these successful trials showed that, without fatigue, the final hand velocity resulted from a 'summation of speed' principle from the elbow to the hand joint. With fatigue, a new inter-segmental organization was necessary in order to maintain a good motor performance. This compensating strategy was characterized by the absence of a temporal delay between the elbow and hand peak velocity suggesting that, with fatigue, movement organization was similar to that of a rigid system. In other words, the 'summation of speeds' principle was no more respected.
本实验的目的是研究多关节运动中对疲劳的适应情况。受试者的任务是在无疲劳和疲劳两种状态下，将球投向三个目标之一。结果表明，成功试验的次数随着疲劳而减少。对这些成功试验的分析表明，在无疲劳状态下，最终手部速度源于从肘部到手关节的“速度总和”原则。出现疲劳时，为了保持良好的运动表现，需要一种新的节段间组织。这种补偿策略的特点是肘部和手部峰值速度之间不存在时间延迟，这表明出现疲劳时，运动组织类似于刚性系统。换句话说，“速度总和”原则不再被遵循。
