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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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网络重新配置的基础是跨力梯度的补偿性肌肉控制:来自EEG和sEMG的并行功能网络证据.

Xiaoguang Liu1, Pengyuan Lin2, Yutong Wang2

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随着力量需求的增加,神经肌肉和皮质网络重新配置,表明协调策略的转变而不是性能改善. 这项研究量化了在同度收缩期间这些网络变化.

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科学领域:

  • 神经科学是一个神经科学.
  • 发动机控制器的控制器
  • 系统生理学 系统生理学

背景情况:

  • 了解神经肌肉适应力是运动控制研究的关键.
  • 肌肉和大脑网络的力量依赖性变化尚未完全理解.

研究的目的:

  • 调查肌肉和皮质功能网络如何在同度上肢任务期间重新配置,以增加力量需求.
  • 描述补偿性运动控制策略.

主要方法:

  • 十二名健康参与者在最大自愿收缩 (MVC) 的30%,50%和70%进行了对称肘部曲.
  • 记录了从8个上肢肌肉的表面电肌图 (sEMG) 和从21个头皮电极的脑电图 (EEG).
  • 使用通用部分定向连贯性 (GPDC) 和计算图形理论指标 (AGE,ACC,APL) 估计的定向功能连接.

主要成果:

  • 肌肉网络:平均全球效率 (AGE) 增加,平均路径长度 (APL) 减少,MVC为70%,而MVC为30%.
  • 皮质网络 (EEGβ频段):AGE增加,APL下降,MVC70%相对于MVC30%.
  • 马波段的变化是有限的或无意义的.

结论:

  • 在同位力力产生过程中证明了肌肉和皮质功能网络的系统性,依赖力量的重新配置.
  • 观察到的网络变化表明,随着部队需求的增加,协调策略的转变.
  • 该框架为未来的临床和纵向研究提供了定量指标.