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在疲劳任务期间导致任务终止的感知因素与感知强度挂
Dolores G Ortega1, Robert W Smith2, Jocelyn E Arnett1
1Exercise Physiology Laboratory, Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, NE 68510, USA.
Journal of functional morphology and kinesiology
|September 23, 2024
概括
在前臂任务中感知到的更高的劳动力会导致更大的表现疲劳,但不会影响到任务失败的时间或整体疲劳模式. 个体神经肌肉反应因运动水平而异.
科学领域:
- 运动生理学 运动生理学
- 神经肌肉生理学 神经肌肉生理学
- 人类表现的人类表现.
背景情况:
- 肌肉疲劳是一种复杂的现象,受任务强度和个人的感知影响.
- 了解感知劳动和神经肌肉疲劳之间的关系对于优化训练和康复至关重要.
研究的目的:
- 为了研究不同级别的感知劳动 (RPE) 对前臂肌肉疲劳的影响.
- 为了比较性能疲劳,任务失败的时间,以及低RPE任务和高RPE任务之间的神经肌肉反应.
- 探索感知因素与任务终止之间的关系.
主要方法:
- 十二名健康的年轻男子在RPE 2和RPE 8进行了持续的同度前臂曲.
- 在任务之前和之后测量了最大自愿异位收缩 (MVICs).
- 分析了扭矩,电肌图 (EMG) 和神经肌肉效率.
- 记录了任务失败的时间 (TTF) 和性能疲劳 (MVIC%的下降).
- 测试后的问卷评估了感知因素.
主要成果:
- 在RPE 8的任务表现出明显更大的性能疲劳性比RPE 2任务.
- 在两种RPE条件之间没有发现TTF的显著差异.
- 这两个任务都显示了扭矩,EMG振幅和神经肌肉效率的显著线性下降.
- 个体神经肌肉反应模式通常与RPE特异,与扭矩模式不同.
- 感知因素与TTF或性能疲劳性没有相关性.
结论:
- 性能疲劳性取决于感知力的排名,即使任务失败的时间相似.
- 虽然复合神经肌肉和扭矩变化遵循类似的模式,但个体神经肌肉反应可能是RPE特异性的.
- 在这种情况下,对疲劳的主观感知不能可靠地预测任务失败或性能下降.
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