Motor Neuron Pools of Synergistic Thigh Muscles Share Most of Their Synaptic Input
Motor Neuron Pools of Synergistic Thigh Muscles Share Most of Their Synaptic Input
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DOI：
10.1523/jneurosci.0240-15.2015
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发表时间：
2015-09-02
影响因子：
5.3
通讯作者：
Farina, Dario
中科院分区：
文献类型：
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作者：
Laine, Christopher M.;Martinez-Valdes, Eduardo;Farina, Dario
对协同肌肉的神经控制还不是很清楚。据推测，协作组中的每一块肌肉都会受到一些独特的神经驱动力，以及一些与该组中其他肌肉共有的驱动力。在这项研究中，我们试图描述在10%和30%的最大自愿力量的等长伸膝力量产生过程中，神经驱动力对人股外侧肌和股内侧肌的强度、频谱和力依赖性。高密度表面肌电信号记录被分解为运动单位动作电位，以检测对各肌肉的神经驱动。使用运动单位一致性分析来表征对各肌肉的总的神经驱动和肌肉之间共享的驱动。使用一种基于部分相干分析的新方法，我们还能够具体研究每块肌肉特有的神经驱动(不是共享的)。结果表明，对Vasti肌的大部分神经驱动是以力依赖的力量和带宽为特征的跨肌驱动。肌肉特异性神经驱动的频率较低(
Neural control of synergist muscles is not well understood. Presumably, each muscle in a synergistic group receives some unique neural drive and some drive that is also shared in common with other muscles in the group. In this investigation, we sought to characterize the strength, frequency spectrum, and force dependence of the neural drive to the human vastus lateralis and vastus medialis muscles during the production of isometric knee extension forces at 10 and 30% of maximum voluntary effort. High-density surface electromyography recordings were decomposed into motor unit action potentials to examine the neural drive to each muscle. Motor unit coherence analysis was used to characterize the total neural drive to each muscle and the drive shared between muscles. Using a novel approach based on partial coherence analysis, we were also able to study specifically the neural drive unique to each muscle (not shared). The results showed that the majority of neural drive to the vasti muscles was a cross-muscle drive characterized by a force-dependent strength and bandwidth. Muscle-specific neural drive was at low frequencies (