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任务失败揭示了手臂升高过程中肩膀肌肉中范围依赖的神经肌肉疲劳

Kara-Lyn Harrison¹, Rebecca Franklin¹, Trisha Scribbans¹

¹Integrative Musculoskeletal Laboratory, Faculty of Kinesiology and Recreation Management, University of Manitoba, Winnipeg, MB, Canada.

Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology

|December 16, 2025

概括

在提起手臂时的神经肌肉疲劳会改变肌肉活动,特别是在中部和顶部的运动范围. 肌肉功能的这种变化可能会增加患上亚膜阻塞综合征的风险.

科学领域:

生物力学生物力学
神经肌肉生理学神经肌肉生理学
运动医学运动医学

背景情况:

重复的上肢活动会使肩膀肌肉疲劳,可能会改变运动机制,增加下凸综合征 (SIS) 风险.
了解疲劳期间的神经肌肉变化对于预防伤害至关重要,但运动阶段的具体模式仍然不清楚.

研究的目的:

为了研究无症状个体在重复的手臂升高任务中出现神经肌肉疲劳的模式.
为了确定疲劳如何影响肌肉激活和神经驱动在不同的手臂高度范围.

主要方法:

参与者进行了重复的主导手臂升高,最大的约30%的同位体肩膀曲负荷直到任务失败.
高密度表面电肌图 (HD-sEMG) 和双极sEMG记录了关键上肢肌肉的肌肉活动.
根平均平方 (RMS) 和平均功率频率 (MPF) 在基线和失败时的底部,中间和顶部臂高度范围中进行了分析.

主要成果:

在任务失败时,在多个肌肉 (PM,AD,BB,SA,LD,IN,UT,MT) 中观察到增加的sEMG振幅 (RMS) 和/或减少的MPF.
这些与疲劳相关的变化在手臂升高的中间和顶部范围内最为突出.
神经肌肉疲劳在很大程度上取决于运动范围.

结论:

肌肉功能在特定的手臂升高范围内发生变化,这与SIS风险升高的范围相吻合.
这些发现为疲劳相关的上肢损伤提供了潜在的神经肌肉基础.
未来的研究应该探索先进的技术,以了解与疲劳和受伤风险相关的动力单元招募和力量生产变化.

关键词:

总体任务总体任务重复的手臂升高方式.肩膀肌肉肩膀肌肉肩膀肌肉肩膀肌肉表面电力学图 (surface electromyography) 是一种表面电力学图.任务失败任务失败

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