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首页> 外文期刊>Gait & posture >Time to task failure influences the postural alteration more than the extent of muscles fatigued
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Time to task failure influences the postural alteration more than the extent of muscles fatigued

机译：工作失败的时间对姿势改变的影响大于对肌肉疲劳程度的影响

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摘要

The aim of this study was to compare the effects of unilateral and bilateral muscle fatigue on monopedal postural control. Nineteen subjects completed bilateral fatiguing contractions and unilateral fatiguing contractions of the quadriceps femoris until the torque output for both exercises dropped below 30% of the measured peak torque (the time to task failure was measured) for three consecutive contractions (independently measured for each leg). Postural control was evaluated by using a force platform which recorded center of foot pressure (COP) and was measured before and after the completion of both fatiguing tasks. Spatio-temporal COP parameters were used to evaluate postural control. The unilateral contractions affected monopedal postural control more than the bilateral fatiguing contractions (p< 0.05). Moreover, the time to task failure was significantly longer for the unilateral contractions than for the bilateral contractions (p< 0.05). The greater alteration of postural control for the unilateral fatiguing contractions compared to the bilateral fatiguing contractions could be related to a longer time to task failure which could provoke greater disturbances of the postural system in terms of sensory input and motor output.
机译：这项研究的目的是比较单侧和双侧肌肉疲劳对单足姿势控制的影响。 19名受试者完成了股四头肌的双侧疲劳性收缩和单侧带疲劳性收缩，直到两次锻炼的扭矩输出均降至连续三个连续收缩（每条腿独立测量）的测量峰值扭矩（测量到完成任务的时间）的30％以下。使用测力平台评估姿势控制，该平台记录足部压力（COP），并在完成两个疲劳任务之前和之后进行测量。时空COP参数用于评估姿势控制。单侧收缩比双侧疲劳性收缩对单足姿势控制的影响更大（p <0.05）。此外，单侧收缩比双侧收缩完成任务失败的时间明显更长（p <0.05）。与双侧疲劳性收缩相比，单侧疲劳性收缩的姿势控制变化更大，可能与完成任务失败的时间更长有关，这可能在感觉输入和运动输出方面引起姿势系统的更大干扰。

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