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Published in: European Journal of Applied Physiology 5/2009

01-07-2009 | Original Article

Normalized EMG to normalized torque relationship of vastus intermedius muscle during isometric knee extension

Authors: Kohei Watanabe, Hiroshi Akima

Published in: European Journal of Applied Physiology | Issue 5/2009

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Abstract

The purpose of the present study was to investigate the electromyography (EMG) to torque relationship of the vastus intermedius (VI) muscle. Thirteen healthy men performed maximal voluntary contraction (MVC) and submaximal contraction during isometric knee extension at 10% of the MVC to 90% of the MVC at intervals of 10% of the MVC level. Surface EMG was detected from four muscle components of the QF muscle group, i.e., VI, vastus lateralis (VL), vastus medialis, and rectus femoris (RF) muscles. Normalized muscle activation in the VI muscle was significantly lower than in the VL muscle at a lower torque level (20 and 40% of MVC) and significantly lower compared to the RF muscle at a higher torque level (from 60 to 90% of MVC). These results suggest that neuromuscular activation in the VI muscle is not consistent with the other components of QF muscle group during submaximal knee extension contractions.
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Metadata
Title
Normalized EMG to normalized torque relationship of vastus intermedius muscle during isometric knee extension
Authors
Kohei Watanabe
Hiroshi Akima
Publication date
01-07-2009
Publisher
Springer-Verlag
Published in
European Journal of Applied Physiology / Issue 5/2009
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-009-1064-z

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