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Evoked tetanic torque and activation level explain strength differences by side
Journal article   Open access   Peer reviewed

Evoked tetanic torque and activation level explain strength differences by side

Chandramouli Krishnan and Glenn N. Williams
European journal of applied physiology, v 106(5), pp 769-774
01 Jul 2009
DOI: https://doi.org/10.1007/s00421-009-1057-y
PMID: 19396616
url
https://europepmc.org/articles/pmc4527969View
Accepted (AM)Open Access (License Unspecified),  Open

Abstract

Life Sciences & Biomedicine Physiology Science & Technology Sport Sciences
Previous studies have demonstrated that healthy young people typically have side-to-side differences in knee strength of about 10% when the peak torque generated by the stronger leg is contrasted with that of the weaker leg. However, the mechanisms responsible for side-to-side differences in knee strength have not been clearly defined. The current study tested the hypothesis that side-to-side knee extensor strength differences are explained by inter-limb variations in voluntary activation, antagonistic hamstrings activity, and electrically evoked torque at rest. Twenty-two volunteers served as subjects. Side-to-side differences in quadriceps activation and electrically evoked knee extensor torque explained 69% of the strength differences by side. Antagonistic hamstrings activity did not contribute significantly. The results suggest both central and peripheral mechanisms contribute to inter-limb variations in strength.

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38 citations in Web of Science
40 citations in Scopus

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Physiology
Sport Sciences
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