Speed-Dependent Modulation of Muscle Activity Based on Muscle Synergies during Treadmill Walking.
Speed-Dependent Modulation of Muscle Activity Based on Muscle Synergies during Treadmill Walking.
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基于跑步机步行期间肌肉协同作用的肌肉活动的速度依赖性调节。
DOI：
10.3389/fnhum.2018.00004
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发表时间：
2018
影响因子：
2.9
通讯作者：
Kouzaki M
中科院分区：
文献类型：
--
作者：
Kibushi B;Hagio S;Moritani T;Kouzaki M
步行速度的调节轻松实现。然而，中枢神经系统（CNS）必须协调众多肌肉才能实现平稳、持续的步行速度控制。为了适当地控制步行速度，中枢神经系统可能需要利用简化的系统来控制大量肌肉。先前的研究表明，中枢神经系统可以通过肌肉协同作用来控制行走，通过模块化组织几块肌肉来简化对肌肉的控制。我们假设中枢神经系统通过灵活调节一个步态周期内肌肉协同作用的激活来控制步行速度。然后，我们使用活动中心 (CoA) 来研究肌肉协同的激活如何依赖于步行速度，CoA 表示一个步态周期内激活时间分布的中心。十名健康男性在跑步机上以 14 种不同的步行速度行走。我们测量了表面肌电图 (EMG) 和运动学数据。使用非负矩阵分解提取肌肉协同作用。然后，我们计算了每块肌肉协同作用的CoA。我们观察到，随着步行速度的变化，每个特定协同作用的 CoA 都会发生变化。随着步行速度的增加，主要在脚后跟接触阶段（C1）激活的CoA和促成双支撑阶段（C3）的激活转移到早期阶段，而产生摆动起始运动（C4）的CoA和与摆动后期阶段（C5）相关的激活转移到后期阶段。 CoA 的这种转变表明 CNS 在调节步行速度期间控制肌肉协同作用的强烈激活。此外，根据步行速度，CoA 的移动可能与运动学或动力学的变化有关。我们得出的结论是，中枢神经系统灵活地控制肌肉协同作用的激活，以调节步行速度。
The regulation of walking speed is easily achieved. However, the central nervous system (CNS) must coordinate numerous muscles in order to achieve a smooth and continuous control of walking speed. To control walking speed appropriately, the CNS may need to utilize a simplified system for the control of numerous muscles. Previous studies have revealed that the CNS may control walking via muscle synergies that simplify the control of muscles by modularly organizing several muscles. We hypothesized that the CNS controls the walking speed by flexibly modulating activation of muscle synergies within one gait cycle. Then, we investigated how the activation of muscle synergies depend on walking speeds using the center of activity (CoA) that indicates the center of the distribution of activation timing within one gait cycle. Ten healthy men walked on a treadmill at 14 different walking speeds. We measured the surface electromyograms (EMGs) and kinematic data. Muscle synergies were extracted using non-negative matrix factorization. Then, we calculated the CoA of each muscle synergy. We observed that the CoA of each specific synergy would shift as the walking speed changed. The CoA that was mainly activated during the heel contact phase (C1) and the activation that contributed to the double support phase (C3) shifted to the earlier phase as the walking speed increased, whereas the CoA that produced swing initiation motion (C4) and the activation that related to the late-swing phase (C5) shifted to the later phase. This shifting of the CoA indicates that the CNS controls intensive activation of muscle synergies during the regulation of walking speed. In addition, shifting the CoA might be associated with changes in kinematics or kinetics depending on the walking speed. We concluded that the CNS flexibly controls the activation of muscle synergies in regulation of walking speed.
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影响因子：
2.4
作者：
den Otter, AR;Geurts, ACH;Duysens, J
通讯作者：
Duysens, J
影响因子：
2.4
作者：
Liu, May Q.;Anderson, Frank C.;Schwartz, Michael H.;Delp, Scott L.
通讯作者：
Delp, Scott L.
影响因子：
1.8
作者：
Bus, SA;de Lange, A
通讯作者：
de Lange, A
影响因子：
2.5
作者：
Martino, G.;Ivanenko, Y. P.;Lacquaniti, F.
通讯作者：
Lacquaniti, F.
影响因子：
3.4
作者：
Kouzaki M;Shinohara M
通讯作者：
Shinohara M