Action Direction of Muscle Synergies in Voluntary Multi-Directional Postural Control.
Action Direction of Muscle Synergies in Voluntary Multi-Directional Postural Control.
复制标题
DOI：
10.3389/fnhum.2017.00434
复制
发表时间：
2017
影响因子：
2.9
通讯作者：
Kouzaki M
中科院分区：
文献类型：
--
作者：
Kubo A;Hagio S;Kibushi B;Moritani T;Kouzaki M
肌肉协同是肌肉的协调结构，其已被提出作为减少中枢神经系统（CNS）在运动任务中必须处理的变量的数量的策略。本文研究了肌肉协同和肌肉协调结构在随意多向姿势控制中的力学贡献。健康的年轻受试者的任务是通过倾斜身体10 s，将他们的压力中心（COP）转移并对准分散在水平面12个不同方向的目标。实验中记录了18块肌肉的肌电图和COPs。利用非负矩阵分解（NMF）提取肌肉协同作用，揭示了保持姿态向各个方向倾斜的协调模块结构。然后是方向特性，例如机械作用（即，动作方向，我们在下面使用AD作为缩写），使用肌电图加权平均（EWA）方法估计肌肉协同作用和肌肉，该方法基于肌肉协同作用的激活中的波动和COP之间的互相关。结果表明，大部分被试的肌肉协同AD几乎均匀分布在任务空间中，这表明机械特性减少了姿势控制中的冗余。根据肌肉协同作用的组成和单个肌肉的AD，我们证实了多方向姿势控制中的肌肉协同作用包括几块肌肉的组合，包括在不同关节产生扭矩的各种AD。
A muscle synergy is a coordinative structure of muscles that has been proposed as a strategy to reduce the number of variables that the central nervous system (CNS) has to address in motor tasks. In this article, the mechanical contribution of muscle synergies and coordinative structures of muscles in voluntary multi-directional postural control were investigated. The task for healthy, young subjects was to shift and align their center of pressure (COP) to targets dispersed in 12 different directions in the horizontal plane by leaning their bodies for 10 s. Electromyograms (EMGs) of 18 muscles and COPs were recorded in the experiment. Muscle synergies were extracted using non-negative matrix factorization (NMF), and the structure of coordinative modules to keep the posture leaning toward various directions was disclosed. Then the directional properties, such as the mechanical role (i.e., action directions, we use ADs as abbreviation below), of muscle synergies and muscles were estimated using an electromyogram-weighted averaging (EWA) method, which is based on a cross-correlation between the fluctuations in the activation of muscle synergies and the COP. The results revealed that the ADs of muscle synergies were almost uniformly distributed in the task space in most of the subjects, which indicates that mechanical characteristics reduce the redundancy in postural control. In terms of the composition of muscle synergies and the ADs of individual muscles, we confirmed that muscle synergies in multi-directional postural control comprised a combination of several muscles, including various ADs, that generate torque at different joints.
登录
查看更多内容
影响因子：
5.3
作者：
d'Avella, Andrea;Portone, Alessandro;Lacquaniti, Francesco
通讯作者：
Lacquaniti, Francesco
影响因子：
2.5
作者：
Bingham, Jeffrey T.;Choi, Julia T.;Ting, Lena H.
通讯作者：
Ting, Lena H.
影响因子：
2
作者：
Hagio, Shota;Kouzaki, Motoki
通讯作者：
Kouzaki, Motoki
影响因子：
2.9
作者：
Hagio S;Fukuda M;Kouzaki M
通讯作者：
Kouzaki M
影响因子：
2
作者：
Aramaki, Y;Nozaki, D;Yano, H
通讯作者：
Yano, H