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http://dx.doi.org/10.5392/JKCA.2018.18.01.173

Positive and Negative Covariation Mechanism of Multiple Muscle Activities During Human Walking  

Kim, Yushin (한국과학기술원 신경재활공학연구실)
Hong, Youngki (청주대학교 스포츠의학과)
Publication Information
The Journal of the Korea Contents Association / v.18, no.1, 2018 , pp. 173-184 More about this Journal
Abstract
In human walking, muscle co-contraction which produces simultaneous activities of multiple muscles is important in motor control mechanism of the central nervous system. This study aims to understand positive and negative covariation mechanism of inter-muscle activities during walking. In this study, we measured electromyography (EMG) in leg muscles. To identify motor modules, we recored EMG from 4 leg muscles bilaterally (the tibialis anterior, medial gastrocnemius, rectus femoris and medial hamstring muscles) and performed non-negative matrix factorization (NMF) and principa component analysis (PCA). Then, we computed covariation values from various combinations between muscles or motor modules and used two-way repeated measures analysis of variance to identify significantly different covariation patterns between muscle combinations. As the results, we found significant differences between covariation values of muscle combinations (p < 0.05). muscle groups within the same motor modules produced the positive covariations. However, there were strong negative covariation between motor modules. There was negative covariation in all muscle combination. Stable inter-module negative covariation suggests that motor modules may be the control unit in the complex motor coordination.
Keywords
Muscle Co-contraction; Walking; Covariation; Non-negative Matrix Factorization; Principle Component Analysis;
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