The effect of a fatiguing exercise by the index finger on single- and multi-finger force production tasks
The effect of a fatiguing exercise by the index finger on single- and multi-finger force production tasks
复制标题
DOI：
10.1007/s002210100698
复制
发表时间：
2001-06-01
影响因子：
2
通讯作者：
Zatsiorsky, VM
中科院分区：
文献类型：
--
作者：
Danion, F;Latash, ML;Zatsiorsky, VM
我们研究了疲劳的影响，诱导60秒的最大等距生产力与食指，多指协调和生产力的其他手指的手。在单指和多指最大随意力产生（MVC）过程中，在两个部位（远端中间或近端指骨中间）测量手指力。两个疲劳练习涉及生产力的食指，一个在远端指骨和其他在近端指骨。食指的MVC下降了约33%，当它产生在涉及疲劳运动的网站。此外，在施力部位和手指之间观察到了较大的疲劳传递效应。在疲劳状态下，力量不足会增加，特别是由于食指的募集量下降。在疲劳状态下，食指在其他手指的力量产生过程中受到的奴役较少。在多指任务中，食指产生的总力的百分比在疲劳运动后显著降低。在疲劳状态下，违反了次弯矩最小化原则。我们认为，最受损（疲劳）的手指显示较少的相互作用与其他手指，或者换句话说，正在逐步从多指协同。一些观察到的手指协调变化表明中枢（神经）水平的疲劳效应。
We studied the effects of fatigue, induced by a 60-s maximal isometric force production with the index finger, on multi-finger coordination and force production by the other fingers of the hand. Finger forces were measured during single- and multi-finger maximal voluntary force production (MVC) at two sites, the middle of the distal or the middle of the proximal phalanges. Two fatiguing exercises involving force production by the index finger were used, one at the distal phalanx and the other at the proximal phalanx. The MVC of the index finger dropped by about 33% when it was produced at the site involved in the fatiguing exercise. in addition, large transfer effects of fatigue were observed across sites of force application and across fingers. Force deficit increased under fatigue, especially due to a drop in the recruitment of the index finger Under fatigue, the index finger was less enslaved during force production by other fingers. During multi-finger tasks, the percentage of total force produced by the index finger was significantly reduced after the fatiguing exercise. The principle of minimization of secondary moments was violated under fatigue. We suggest that the most impaired (fatigued) finger shows less interaction with other fingers or, in other words, is being progressively removed from the multi-finger synergy. Some of the observed changes in finger coordination suggest effects of fatigue at a central (neural) level.