This study was supported in part by grants from the National Institutes of Health (NRSA F31 AR056175 to K.G.A., K12 HD055931 to L.F.L., and K01AR056134 to L.F.L.), the American Physical Therapy Association (to K.G.A.), and the United States Council for Automotive Research, Southfield, Michigan.
Muscle coactivation: A generalized or localized motor control strategy?
Article first published online: 30 AUG 2013
Copyright © 2013 Wiley Periodicals, Inc.
Muscle & Nerve
Volume 48, Issue 4, pages 578–585, October 2013
How to Cite
Frey-Law, L. A. and Avin, K. G. (2013), Muscle coactivation: A generalized or localized motor control strategy?. Muscle Nerve, 48: 578–585. doi: 10.1002/mus.23801
- Issue published online: 23 SEP 2013
- Article first published online: 30 AUG 2013
- Accepted manuscript online: 30 JAN 2013 10:35PM EST
- Manuscript Accepted: 17 JAN 2013
- motor control;
- muscle cocontraction
Introduction: We examined generalized versus joint-specific influences on muscle coactivation. Methods: Muscle coactivation was assessed during maximal isometric and isokinetic knee and elbow joint extension moments in 48 healthy subjects (27 men). Local (joint-specific) and generalized (person-specific) contributions were examined using a combination of statistical tests, including regression with generalized estimating equations (GEEs), exploratory factor analysis, and cluster analysis. Results: GEEs produced similar significant coefficients for gender and joint; contraction type and test condition (angle or velocity) were not significant. Factor analysis indicated 2 joint-based factors, and cluster analysis indicated 2 groups of individuals, those with and without elevated coactivation at the knee and elbow. Women exhibited greater coactivation at both joints, but no consistent influences of angle or velocity were observed at either joint. Conclusion Muscle coactivation is a neuromuscular control response determined by local, joint-specific, and generalized, individual-specific influences. Muscle Nerve 48: 578–585, 2013