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Knee angle-specific MVIC for triceps surae EMG signal normalization in weight and non weight-bearing conditions
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (Nationellt Vintersportcentrum)
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (Nationellt Vintersportcentrum)ORCID iD: 0000-0002-3814-6246
2013 (English)In: Journal of Electromyography & Kinesiology, ISSN 1050-6411, E-ISSN 1873-5711, Vol. 23, no 4, p. 916-923Article in journal (Refereed) Published
Abstract [en]

Varying the degree of weight-bearing (WB) and/or knee flexion (KF) angle during a plantar-flexion maximal voluntary isometric contraction (MVIC) has been proposed to alter soleus and/or gastrocnemius medialis and lateralis activation. This study compared the surface EMG signals from the triceps surae of 27 men and 27 women during WB and non weight bearing (NWB) plantar-flexion MVICs performed at 0° and 45° of KF. The aim was to determine which condition was most effective at eliciting the greatest EMG signals from soleus, gastrocnemius medialis, and gastrocnemius lateralis, respectively, for subsequent use for the normalization of EMG signals. WB was more effective than NWB at eliciting the greatest signals from soleus (p=0.0021), but there was no difference with respect to gastrocnemius medialis and lateralis (p⩾0.2482). Although the greatest EMG signals during MVICs were more frequently elicited at 0° of KF from gastrocnemius medialis and lateralis, and at 45° from soleus (p<0.001); neither angle consistently captured peak gastrocnemius medialis, gastrocnemius lateralis or soleus activity. The present findings encourage more consistent use of WB plantar flexion MVICs for soleus normalization; confirm that both WB and NWB procedures can elicit peak gastrocnemius activity; and emphasize the fact that no single KF angle consistently evokes selective maximal activity of any individual triceps surae muscle.

Place, publisher, year, edition, pages
2013. Vol. 23, no 4, p. 916-923
Keywords [en]
Electromyography
National Category
Medical and Health Sciences Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-20485DOI: 10.1016/j.jelekin.2013.03.012ISI: 000321107900024Scopus ID: 2-s2.0-84879555157OAI: oai:DiVA.org:miun-20485DiVA, id: diva2:676472
Available from: 2013-12-06 Created: 2013-12-06 Last updated: 2017-12-06Bibliographically approved

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Hébert-Losier, KimHolmberg, Hans-Christer

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