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首页> 外文期刊>Journal of Sports Medicine and Physical Fitness >Effects of lower limbs muscular fatigue on anticipatory postural adjustments during arm motions in humans
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Effects of lower limbs muscular fatigue on anticipatory postural adjustments during arm motions in humans

机译：下肢肌肉疲劳对人体手臂运动中预期姿势调整的影响

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摘要

Background. The purpose of the present experiment was to examine the effects of lower limbs muscular fatigue on the anticipatory postural adjustments during a voluntary arm raising movement. Methods. Eight adult males (mean age 29+-6 years) voluntarily participated to the experiment. Subjects' task consisted in performing an unilateral ante-flexion of the right arm over 90 deg, holding a 500 g weight, once having stabilized their upright posture. A similar movement execution was required. Measurements were made in a no-fatigue situation and under a high level of fatigue of lower limbs. Surface EMG of four postural muscles (the ipsilateral and contralateral Gastrocnemius and the ipsilateral and contralateral Semitendinosus) and of one muscle involved in the arm raising (the Anterior Deltoiedeus of the right arm) was recorded. Body sway was also monitored using a force platform. Results. With fatigue, quantitative EMG analysis showed a decrease of the ipsilateral Semitendinosus activity whereas the temporal EMG analysis showed an increase of its latency with respect to movement onset. Conclusions. These data suggested a functional adaptation resulting in an invariance of global anticipatory postural adjustments for the two conditions of no-fatigue and fatigue and ensuring an adequate execution of the movement.
机译：背景。本实验的目的是检查下肢肌肉疲劳对自愿举臂运动中预期姿势调整的影响。方法。八名成年男性（平均年龄29 + -6岁）自愿参加了实验。受试者的任务包括在稳定直立姿势后，右臂在90度以上进行单侧前屈，并保持500 g的重量。需要执行类似的运动。在无疲劳的情况下和下肢高度疲劳的情况下进行测量。记录了四个姿势肌肉（同侧和对侧腓肠肌以及同侧和对侧Semitendinosus）和一只参与手臂抬高的肌肉（右臂前三角肌）的表面肌电图。还使用测力平台监测了车身摇摆。结果。对于疲劳，定量肌电图分析显示同侧半腱肌活动减少，而颞肌电图分析显示其相对于运动发作的潜伏期增加。结论。这些数据表明，功能上的适应性导致了在没有疲劳和疲劳的两种情况下全局预期姿势调整的不变性，并确保了运动的充分执行。

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