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Title of Journal: Eur J Appl Physiol

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Abbravation: European Journal of Applied Physiology

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Springer-Verlag

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DOI

10.1007/s13762-012-0149-0

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1439-6327

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Activation amplitude patterns do not change for ba

Authors: Heather L Butler Cheryl L HubleyKozey John W Kozey
Publish Date: 2009/02/11
Volume: 106, Issue: 1, Pages: 95-104
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Abstract

It is assumed when lifting with the dominant hand that the relationship between contralateral and ipsilateral trunk muscle responses are similar to when lifting with the nondominant hand The purpose of this study was to quantify trunk muscle activation amplitude patterns during right and lefthanded lifts Surface electromyography EMG and kinematic variables were recorded from 29 healthy subjects Minimal trunk and pelvis motion was observed Three principal patterns accounted for 95 of the variation in the EMG data indicating minimal variation in the pattern Significant differences in scores captured different recruitment strategies for reach and hand Selective and differential recruitment of back sites characterized lifts at greater distances from the body whereas coactivation between internal oblique and back sites characterized lifts closer to the body While the results showed no handedness effect for back muscles the external oblique responded differently between right and lefthanded lifts Specific recruitment strategies were used to account for subtle changes in reach and asymmetrical demandsThe authors would like to acknowledge the financial support from The Natural Sciences and Engineering Research Council of Canada NSERC and Nova Scotia Health Research Foundation NSHRF and specialized assistance from J Crouse N Hill M Abbott J Boulay and C Cameron

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