Identification of muscle synergies associated with gait transition in humans.
Identification of muscle synergies associated with gait transition in humans.
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DOI：
10.3389/fnhum.2015.00048
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发表时间：
2015
影响因子：
2.9
通讯作者：
Kouzaki M
中科院分区：
文献类型：
--
作者：
Hagio S;Fukuda M;Kouzaki M
没有理论或经验证据表明中枢神经系统(CNS)如何控制与步行和跑步之间的步态转换相关的各种肌肉。在这里，我们研究了基于肌肉协同效应的步态转换中的运动控制，肌肉协同效应以模块化的方式组织功能相似的肌肉。为此，受试者在跑步机上行走或跑步，并在跑步机速度增加或降低时自发地进行步态转换(变速条件)，或者自愿在恒定跑步机速度下遵循实验者的指令(恒速条件)。记录11条双侧肢体肌肉的表面肌电信号(EMG)。然后，我们使用非负矩阵分解从肌电数据中提取协同作用的肌肉权重及其激活系数。结果，步态转换由大约9个肌肉协同作用控制，这在行走和跑步过程中很常见，它们的激活曲线在步态转换前后发生了变化。在步态转换附近，由足底屈肌组成的协同作用的峰值激活阶段在步行到跑步的转换阶段被转移到更早的阶段，反之亦然。在变速条件下，位移是渐进的，而在恒速条件下，观察到突变。这些结果表明，CNS根据传入信息(自发步态转换)或仅通过改变肌肉协同作用的下行神经输入(自愿步态转换)来低维调节特定协同效应的激活模式，以实现步态转换。
There is no theoretical or empirical evidence to suggest how the central nervous system (CNS) controls a variety of muscles associated with gait transition between walking and running. Here, we examined the motor control during a gait transition based on muscle synergies, which modularly organize functionally similar muscles. To this end, the subjects walked or ran on a treadmill and performed a gait transition spontaneously as the treadmill speed increased or decreased (a changing speed condition) or voluntarily following an experimenter’s instruction at constant treadmill speed (a constant speed condition). Surface electromyograms (EMGs) were recorded from 11 lower limb muscles bilaterally. We then extracted the muscle weightings of synergies and their activation coefficients from the EMG data using non-negative matrix factorization. As a result, the gait transition was controlled by approximately 9 muscle synergies, which were common during a walking and running, and their activation profiles were changed before and after a gait transition. Near a gait transition, the peak activation phases of the synergies, which were composed of plantar flexor muscles, were shifted to an earlier phase at the walk-to-run transition, and vice versa. The shifts were gradual in the changing speed condition, but an abrupt change was observed in the constant speed condition. These results suggest that the CNS low-dimensionally regulate the activation profiles of the specific synergies based on afferent information (spontaneous gait transition) or by changing only the descending neural input to the muscle synergies (voluntary gait transition) to achieve a gait transition.
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