两个运动神经元的协同作用,在脚关节的角度不变,在脚flexion期间激活三肌 surae
Jackson Levine1,2,3, Simon Avrillon1,2,4, Dario Farina4
1Legs + Walking Lab, Shirley Ryan AbilityLab, Chicago, IL, USA.
The Journal of physiology
|August 24, 2023
概括
中枢神经系统使用运动神经元协同作用来进行运动. 这些协同作用在不同的脚角度保持稳定,表明在脚下屈曲过程中对肌肉激活的一致控制策略.
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
- 生物力学 生物力学
背景情况:
- 神经系统通过控制运动神经元组 (协同作用) 来产生运动.
- 这些协同作用可能并不总是与解剖学肌肉划分保持一致.
- 了解这些协同作用在不同机械约束的强度至关重要.
研究的目的:
- 为了确定运动神经元协同作用是否在具有不同机械约束的任务中强大.
- 为了研究运动神经元协同作用的稳定性,在各种脚角度的脚下屈曲期间.
- 评估共同的输入驱动运动神经元激活三肌 surae 肌肉.
主要方法:
- 模拟用于验证主要成分分析 (PCA) 和交叉相关性方法,以确定运动神经元协同作用.
- 来自16个个体的胃侧肌 (GL),中侧肌 (GM) 和肌底肌 (SOL) 的电肌图 (EMG) 信号被记录下来.
- 参与者在三个脚角度进行了对称脚下屈曲,并使用PCA和交叉相关性分析确定了运动神经元协同作用.
主要成果:
- PCA 显示,在足底flexion 期间有两个稳定的运动神经元协同作用,在脚角度的重量分布上没有显著差异 (P = 0.62).
- 交叉相关性分析显示GL和GM肌肉的运动单元之间的共同输入很低 (13.0%的对表现出显著的相关性).
- 确定了两个主要的共同输入来源,驱动三肌肌肉的运动神经元.
结论:
- 运动神经元协同作用是强大的,不变的变化机械约束 (脚角度) 在脚下屈曲.
- 这种不变性表明,中枢神经系统中存在一个模块化组织,用于有效控制运动.
- 这些发现强调了模块化在减少电机控制计算需求方面的功能相关性.
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