The reliability of electromechanical delay and torque during isometric and concentric isokinetic contractions

Howatson, Glyn, Glaister, Mark, Brouner, James and van Someren, Ken (2009) The reliability of electromechanical delay and torque during isometric and concentric isokinetic contractions. Journal of Electromyography and Kinesiology, 19 (5). pp. 975-979. ISSN 1050-6411

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Official URL: http://dx.doi.org/10.1016/j.jelekin.2008.02.002

Abstract

The purpose of this investigation was to examine the intra-subject reliability of electromechanical delay (EMD) and torque of the dominant and non-dominant elbow flexors during isometric and isokinetic muscle contractions repeated over five consecutive days. Eleven volunteers that were unfamiliar with isokinetic dynamometry participated in this study and were asked to attend the laboratory on five consecutive days. An isokinetic dynamometer was used to exercise the elbow flexors under isometric, slow (60° s−1) and fast (210° s−1) isokinetic conditions; surface electromyography was recorded from the belly of biceps brachii and the signal was synchronised with the dynamometer to determine EMD. Intra-subject reliability for all measures was good (CV range, 3.1–6.5%) with no discernable difference between the dominant and non-dominant arms during isometric and isokinetic conditions. In addition, there was little difference in EMD and torque variability between the dominant and non-dominant arms which may have applications for clinicians and future research design when monitoring and investigating human muscle function. These data provide researchers and clinicians with an indication of the magnitude of change that is required to elucidate the presence of a meaningful change to muscle function in the elbow flexors.

Item Type: Article
Uncontrolled Keywords: repeatability, coefficient of variation, electromyography, isokinetic dynamometry
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > School of Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: EPrints Services
Date Deposited: 07 May 2010 10:31
Last Modified: 10 Aug 2015 11:43
URI: http://nrl.northumbria.ac.uk/id/eprint/3045

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