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Does sEMG normalization change results on sex differences in the activation of the shoulder girdle muscles during a simulated work task?
Federal University of São Carlos, Brazil.
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational Health Science and Psychology, Occupational Health Science. Federal University of São Carlos, Brazil.ORCID iD: 0000-0002-2844-3757
Federal University of São Carlos, Brazil.
McGill University.
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2020 (English)In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 85, article id 103044Article in journal (Refereed) Published
Abstract [en]

The aim was to investigate if the method of normalizing surface electromyography (sEMG) can change results on sex differences in the muscular activation of the shoulder girdle muscles during a simulated work task. sEMG was recorded in 36 asymptomatic participants (17 females, 19 males) from four parts of trapezius and from serratus anterior muscles during a simulated work task. Four normalization methods, one involving maximal voluntary contractions (MVCs) and three involving submaximal voluntary contractions were applied. Sex differences in absolute and normalized amplitude of sEMG were analyzed. The normalization method had a significant influence on the observed sex differences. Females only showed higher sEMG amplitude than males when the sEMGs were normalized to MVC and to a submaximal contraction based on 20% of MVC for the upper trapezius (acromial fibers). Researchers and practitioners should be aware of the impact of the sEMG normalization method in sex differences investigation.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 85, article id 103044
Keywords [en]
Gender differences, Neck/shoulder, Repetitive task
National Category
Health Sciences Physiology
Identifiers
URN: urn:nbn:se:hig:diva-31450DOI: 10.1016/j.apergo.2020.103044PubMedID: 31932265Scopus ID: 2-s2.0-85077506621OAI: oai:DiVA.org:hig-31450DiVA, id: diva2:1386274
Available from: 2020-01-17 Created: 2020-01-17 Last updated: 2020-03-20Bibliographically approved

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Januario, Leticia

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CiteExportLink to record
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