Abstract：
: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.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Hagio S,Kouzaki Mdoi
10.1007/s00221-015-4253-5subject
Has Abstractpub_date
2015-06-01 00:00:00pages
1811-23issue
6eissn
0014-4819issn
1432-1106journal_volume
233pub_type
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journal_title：Experimental brain research
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