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Surface electromyography and peak torque of repetitive maximum isokinetic plantar flexions in relation to aspects of muscle morphology
Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. (RISPA- MEP-RG)ORCID iD: 0000-0002-9831-0896
2006 (English)In: Journal of Electromyography & Kinesiology, ISSN 1050-6411, E-ISSN 1873-5711, Vol. 16, no 3, 281-290 p.Article in journal (Refereed) Published
Abstract [en]

This study investigates the relationships between surface electromyography (EMG [Mean frequency of the power spectrum (MNF)]) and peak torque variables obtained during 100 maximum concentric plantar flexions with the right limb at 60 degrees s(-1) and different muscle morphological variables. Surface EMG was recorded from the right gastrocnemius lateralis and muscle biopsies were taken from the same site as the EMG electrodes were positioned. Muscle fibre area and fibre type composition were determined on serial muscle cross sections using both histochemistry (myofibrillar adenosine triphosphatase) and immunohistochemistry (monoclonal antibodies against specific myosin heavy chain isoforms). Forty-three female and nine male students participated in the study. Gastrocnemius lateralis contained predominantly type I fibres (50%) and type IIA fibres (40%) in both sexes and large individual differences were found. Principal component analysis (PCA) was used for the intercorrelation analyses, and projection to latent structures (PLS) was used for the multivariate regression analysis. MNF correlated positively with different fibre areas and with the proportion of type I fibres. Fibre areas and sex were the most important factors in the regression of maximum peak torque. High proportion of type I fibres and sex were the most important regressors of peak torque endurance normalised for lean body mass. More studies are needed to understand the complex interrelationships between intrinsic muscle properties and the frequency content of the surface EMG before theoretical models can be formulated that incorporate both fibre areas and fibre type proportions.

Place, publisher, year, edition, pages
2006. Vol. 16, no 3, 281-290 p.
Keyword [en]
Muscle fatigue, Muscle fibres, Dynamic, Gastrocnemius lateralis, Electromyography
National Category
Medical and Health Sciences Physiology Social Sciences Interdisciplinary Sport and Fitness Sciences
Research subject
Sports Science; Physiology
Identifiers
URN: urn:nbn:se:oru:diva-6275DOI: 10.1016/j.jelekin.2005.07.009PubMedID: 16129622OAI: oai:DiVA.org:oru-6275DiVA: diva2:211701
Available from: 2009-04-17 Created: 2009-04-17 Last updated: 2016-12-07Bibliographically approved

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Kadi, Fawzi
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CiteExportLink to record
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