Fatigue effects on tracking performance and muscle activity
Fatigue effects on tracking performance and muscle activity
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DOI：
10.1016/j.jelekin.2006.11.003
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发表时间：
2008-06-01
影响因子：
2.5
通讯作者：
van Dieen, J. H.
中科院分区：
文献类型：
--
作者：
Huysmans, M. A.;Hoozemans, M. J. M.;van Dieen, J. H.
有人认为，疲劳会影响本体感觉，从而影响运动准确性，其影响可能会通过增加肌肉活动来抵消。为了确定疲劳对桡侧伸腕肌 (ECR) 跟踪性能和肌肉活动的影响，11 名女性参与者在疲劳手腕伸展方案之前和之后立即用电脑鼠标执行了 2 分钟的跟踪任务。跟踪性能受到疲劳的显着影响。疲劳方案后，任务前半部分的目标时间百分比显着降低，但任务后半部分不受影响。疲劳方案后，到目标的平均距离和到目标的距离的标准偏差均增加。性能的改变伴随着 ECR 中更高的峰值肌电图振幅，而静态和中值肌电图水平不受影响。这项研究的结果表明，受试者在疲劳时会改变跟踪性能，以满足保持目标的任务指令。与我们的预期相反，这并没有导致整体更高的肌肉活动，而是导致 ECR 的峰值肌肉活动水平选择性增加。 (C) 2006 Elsevier Ltd. 保留所有权利。
It has been suggested that fatigue affects proprioception and consequently movement accuracy, the effects of which may be counteracted by increased muscle activity. To determine the effects of fatigue on tracking performance and muscle activity in the M. extensor carpi radialis (ECR), 11 female participants performed a 2-min tracking task with a computer mouse, before and immediately after a fatiguing wrist extension protocol. Tracking performance was significantly affected by fatigue. Percentage time on target was significantly lower in the first half of the task after the fatigue protocol, but was unaffected in the latter half of the task. Mean distance to target and the standard deviation of the distance to target were both increased after the fatigue protocol. The changed performance was accompanied by higher peak EMG amplitudes in the ECR, whereas the static and the median EMG levels were not affected. The results of this study showed that subjects changed tracking performance when fatigued in order to meet the task instruction to stay on target. Contrary to our expectations, this did not lead to an overall higher muscle activity, but to a selective increase in peak muscle activity levels of the ECR. (C) 2006 Elsevier Ltd. All rights reserved.