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Muscle activation is enhanced with multi- and uni-articular bilateral versus unilateral contractions

journal contribution
posted on 2003-02-01, 00:00 authored by D G Behm, K E Power, Eric DrinkwaterEric Drinkwater
Ten resistance trained (RT) and 6 non-resistance trained (NRT) subjects were used to determine differences in quadriceps activation between isometric single and double knee extensions and squat contractions. Greater inactivation, as measured by the interpolated twitch technique, was recorded with single (RT: 16.5%, NRT: 17.6%) than double leg extensions (RT: 8.4%, NRT: 13.4%) or squats (RT: 4.03%, NRT: 1.7%). There was no significant difference between the maximum voluntary contraction (MVC) force of the dominant leg during single and double leg extensions. However, in NRT subjects, the contralateral or non-dominant leg during double leg extensions exhibited significantly less force than the dominant leg (715.9 vs 566.9 N). This deficit may be due to a lesser reliance on the non-dominant limb. The contractions of multiple lower body muscle groups enhanced the activation of the dominant quadriceps. Greater levels of activation may be necessary to cope with the stabilization necessary for bilateral and multi-articular contractions.

History

Journal

Canadian journal of applied physiology

Volume

28

Issue

1

Pagination

38 - 52

Publisher

NRC Research Press

Location

Ottawa, Ont.

ISSN

1066-7814

eISSN

1543-2718

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2003, Canadian Society for Exercise Physiology