摩托单元活动在flexor digitorum brevis的作用,在向前倾斜时保持平衡
Chrysi Tsiouri1, Ioannis G Amiridis1, Anthi Angelou1
1Laboratory of Neuromechanics, Department of Physical Education and Sport Sciences at Serres, Aristotle University of Thessaloniki, Serres, Greece.
Journal of sports sciences
|February 6, 2025
概括
柔性部 (Flexor Digitorum Brevis,FDB) 和部 (Soleus,SOL) 肌肉中的运动单元活动在向前倾斜的任务中不同地影响力波动. 肌肉对平衡控制的贡献因任务需求而异,影响力变化.
科学领域:
- 生物力学 生物力学
- 神经科学是一个神经科学.
- 人类运动科学科学 人类运动科学
背景情况:
- 运动单元活动对于保持姿势稳定至关重要.
- 了解肌肉对平衡控制的贡献,对于预防和康复伤害至关重要.
研究的目的:
- 为了比较Flexor Digitorum Brevis (FDB) 和Soleus (SOL) 中运动单元活动对前倾任务中的力波动的影响.
- 调查神经驱动和突触噪声如何与这些肌肉在不同姿势需求中的强力变化有关.
主要方法:
- 收集了19只雄性在前倾时25%,50%和75%的最大力时的地面反应力和高密度EMG信号.
- 分析了EMG振幅,力波动 (变化系数 - CoV),神经驱动 (过累积尖峰列车的标准偏差 - fCST的SD) 和突触噪声 (尖峰间隔的CoV).
主要成果:
- 随着倾斜强度的增加,EMG振幅增加,在SOL中大于FDB.
- 在三个倾斜任务中没有观察到力波动的显著差异.
- 神经驱动 (fCST的SD) 与力变性 (CoV) 有很强的相关性,而突触噪声的相关性较弱.
- 神经驱动和力变异性之间的相关性在较低目标力的FDB中更高.
结论:
- 在向前倾斜时,FDB和SOL肌肉对平衡控制的相对贡献因任务要求而有所不同.
- 神经驱动的变化,而不是突触噪声,是这些肌肉中力量波动的更强的预测因素.
- 这些发现提供了关于运动单元活动和姿势控制之间的复杂相互作用的见解.
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