在步行-跑步和跑步-步行过渡期间的肌肉协同作用
Leonardo Lagos-Hausheer1,2, Samuel Vergara3, Victor Munoz-Martel4
1Biomechanics and Movement Analysis Research Laboratory, Department of Biological Sciences, CENUR Litoral Norte, Universidad de la República, Paysandú, Paysandú, Uruguay.
肌肉协同作用在步行-跑步和跑步-步行过渡期间适应. 不同的激活模式和模块计数突出显示了中央神经系统 (CNS) 如何调整运动策略以适应速度变化.
科学领域:
- 生物力学 生物力学
- 发动机控制器的控制器
- 人类运动分析 人类运动分析
背景情况:
- 肌肉协同作用是中央神经系统 (CNS) 使用的激活模式,以简化运动的产生.
- 之前的研究在步行-跑步过渡中发现了多达九个协同效应模块,与纯粹的步行或跑步相比,注意到较早的脚肌肉激活.
研究的目的:
- 在步行-跑步 (WRT) 和跑步-步行 (RWT) 过渡期间调查肌肉协同行为.
- 分析这些步态转变期间的姿势和摆动阶段的变化.
主要方法:
- 二十四名训练有素的男子执行了变速跑步机协议,记录了14个肌肉活动.
- 非负矩阵因子化 (NMF) 分析了表面电肌图数据,以确定协同模块和时间激活配置文件.
- 步行 - 跑步和跑步 - 走路的过渡被确定为突然变化的职责因子.
主要成果:
- 确定了四个不同的过渡步骤 (两个用于增加速度,两个用于减少速度).
- 每个条件观察到4到6个协同模块,WRT共享5个模块,RWT共享4个模块.
- 总体而言,WRT和RWT共享平均4.33个模块,具有不同的激活配置文件和激活中心.
结论:
- 步行过渡发生在步骤层面,包括步行式和跑步式的步骤.
- 与稳定状态行走或跑步相比,WRT和RWT都需要更早地激活协同模块.
- 协同效应是通过加速调节的;RWT涉及更多的共同激活肌肉 (较少的模块) 来消散能量,与WRT不同.
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