不同肌肉延长幅度与电神经刺激相结合对扭矩产生影响
Antoine Pineau1, Alain Martin1, Romuald Lepers1
1INSERM UMR1093-CAPS, Université Bourgogne, UFR des Sciences du Sport, Dijon, France.
Journal of neurophysiology
|December 6, 2024
概括
将低频神经肌肉电刺激 (NMES) 与肌肉延长相结合,可以增强扭矩的产生. 这种效应可能是由于肌肉 afferent 活动增加,而不是高频NMES,其中更大的延长可以抑制扭矩增长.
科学领域:
- 神经肌肉电刺激 (NMES) 是一种神经肌肉电刺激.
- 肌肉生理学 肌肉生理学
- 生物力学 生物力学
背景情况:
- 神经肌肉电刺激 (NMES) 用于唤起肌肉收缩.
- 在刺激期间肌肉延长可能会调节扭矩输出.
- 了解NMES参数和肌肉长度的综合影响对于优化刺激方案至关重要.
研究的目的:
- 为了研究联合宽脉冲NMES和不同幅度的肌肉延长时的扭矩产生.
- 检查刺激频率 (20 Hz与100 Hz) 对扭矩增强的影响.
- 探索潜在的机制,包括持续的EMG活动和 afferent激活.
主要方法:
- 宽脉冲NMES (1毫秒脉冲持续时间) 应用于后神经,频率为20 Hz和100 Hz.
- 单独使用NMES或与肌肉延长 (10°或20°脚旋转) 结合使用.
- 测量了扭矩时间积分 (TTI) 和持续的EMG活动.
主要成果:
- 在20 Hz NMES下,与单独使用NMES相比,TTI随着10°和20°的延长显著增加,而EMG没有变化.
- 在100Hz的NMES中,TTI随着10°的延长而显著增加,而不是20°的延长.
- 在100 Hz NMES的10°延长与持续的EMG活动增加有关,这表明神经参与.
结论:
- 低频NMES与肌肉延长相结合,有效地增加扭矩,可能是通过肌肉 afferent激活.
- 高频NMES与中度 (10°) 延长相结合也会增加扭矩,涉及神经机制.
- 在高频NMES期间延长幅度的增加可能导致前突触抑制,限制扭矩增强.
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