Torso loading via a harness method activates trunk muscles less than a hand loading method

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dc.contributor Wichita State University. Department of Industrial and Manufacturing Engineering en_US
dc.contributor.author McMulkin, Mark L. en_US
dc.contributor.author Woldstad, Jeffrey C. en_US
dc.contributor.author Hughes, Richard E. en_US
dc.date.accessioned 2012-03-14T17:32:03Z
dc.date.available 2012-03-14T17:32:03Z
dc.date.issued 1998-04 en_US
dc.identifier 9672095 en_US
dc.identifier 0157375 en_US
dc.identifier S0021-9290(98)00027-X en_US
dc.identifier.citation Journal of biomechanics. 1998 Apr; 31(4): 391-5. en_US
dc.identifier.issn 0021-9290 en_US
dc.identifier.uri http://hdl.handle.net/10057/4852
dc.description The full text of this article is not available in SOAR. WSU users can access the article via commercial databases licensed by University Libraries: http://libcat.wichita.edu/vwebv/holdingsInfo?bibId=1378173. en_US
dc.description.abstract There is a need for data comparing muscle activity under equivalent moments at the torso using different loading methods. In torso biomechanics, it is often necessary to apply moments to people and then measure or predict the muscle activity in response to the external load. Alternative methods exist to generate moments including applying forces by a chest harness and loads held in the hands. The limitation of previous research has been to use only one of the loading methods, generally harness loading, assuming it produces muscle activity equal to when loads are held in the hands. The objective of the this study was to test if equivalent moments at L3/L4 applied to subjects through two loading methods resulted in the same muscle activity. Subjects maintained a static posture while attempting a combination of flexion/extension, lateral bending, and torsion to counter the external loads applied via hand and harness loading methods. Hand and harness loading did not result in equal muscle activity as measured by electromyographic techniques. The left and right latissimus dorsi had increases in activity (16-25%) when loads were held with the hands instead of applied via the harness. Increased activity for hand loading was also found for the left and right rectus abdominis (13-17%) and left external oblique (24%). The left and right erector spinae and right external oblique exhibited the same activity for both loading methods. The current findings indicate that studies of torso loading using a shoulder harness to create torso moments may be lowering activity of some torso muscles. en_US
dc.format.extent 391-5 en_US
dc.language.iso eng en_US
dc.publisher Pergamon en_US
dc.relation.ispartofseries Journal of Biomechanics en_US
dc.relation.ispartofseries J Biomech en_US
dc.source NLM en_US
dc.subject Research Support, Non-U.S. Gov't en_US
dc.subject.mesh Adult en_US
dc.subject.mesh Biomechanics en_US
dc.subject.mesh Electromyography en_US
dc.subject.mesh Equipment Design en_US
dc.subject.mesh Equipment and Supplies en_US
dc.subject.mesh Humans en_US
dc.subject.mesh Male en_US
dc.subject.mesh Methods en_US
dc.subject.mesh Muscle, Skeletal/physiology en_US
dc.subject.mesh Weight-Bearing/physiology en_US
dc.title Torso loading via a harness method activates trunk muscles less than a hand loading method en_US
dc.type Article en_US
dc.coverage.spacial United States en_US
dc.description.version peer reviewed en_US
dc.rights.holder Copyright © 1998 Elsevier Science en_US

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