Recruitment of muscle synergies is associated with endpoint force fluctuations during multi-directional isometric contractions
Recruitment of muscle synergies is associated with endpoint force fluctuations during multi-directional isometric contractions
复制标题
DOI：
10.1007/s00221-015-4253-5
复制
发表时间：
2015-06-01
影响因子：
2
通讯作者：
Kouzaki, Motoki
中科院分区：
文献类型：
--
作者：
Hagio, Shota;Kouzaki, Motoki
长期以来，人们一直认为人类中枢神经系统使用多种肌肉协同作用的灵活组合来轻松有效地控制冗余运动。然而，神经回路中是否存在肌肉协同作用仍然存在争议，研究协同作用的募集模式与运动输出之间的关系至关重要。在这项研究中，我们研究了在存在信号依赖噪声的情况下，肌肉协同作用的激活与终点力波动之间的关系。受试者在右踝关节矢状面周围进行多向等距力生成。然后，我们使用非负矩阵分解从测量的肌电图（EMG）数据中提取肌肉协同作用。因此，肌肉协同作用的激活总和与来自期望方向的端点力变异性相关。此外，我们确定，每个协同作用的激活轨迹反映了端点力波动使用相互关联分析。因此，这些结果表明，从肌电数据统计计算的肌肉协同作用应该与运动输出有关。
It has long been assumed that the human central nervous system uses flexible combinations of several muscle synergies to effortlessly and efficiently control redundant movements. However, whether muscle synergies exist in the neural circuit remains controversial, and it is critical to examine the association between the recruitment pattern of synergies and motor output. In this study, we examined the relationship between the activation of muscle synergies and endpoint force fluctuations in the presence of signal-dependent noise. Subjects performed multi-directional isometric force generations around the right ankle on the sagittal plane. We then extracted muscle synergies from measured electromyogram (EMG) data using nonnegative matrix factorization. As a result, the sum of the activation of muscle synergies was correlated with the endpoint force variability from the desired directions. Furthermore, we determined that the activation trace of each synergy reflected the endpoint force fluctuations using cross-correlation analysis. Therefore, these results suggest that muscle synergies statistically calculated from EMG data should be related to the motor output.