Are there sex differences in muscle coordination of the upper girdle during a sustained motor task?

Autor(es)

Cid, Marina Machado ^[1] ; Oliveira, Ana Beatriz ^[1] ; Januario, Leticia Bergamin ^[1] ; Cote, Julie N. ^[2] ; Carreira Moreira, Roberta de Fatima ^[1] ; Madeleine, Pascal ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Phys Therapy, Lab Clin & Occupat Kinesiol LACO, Rodovia Washington Luis, Km 235 SP 310, Sao Carlos, SP - Brazil

^[2] McGill Univ, Dept Kinesiol & Phys Educ, 475 Pine Ave West, Montreal, PQ H2W 1S4 - Canada

^[3] Aalborg Univ, Dept Hlth Sci & Technol, Lab Ergon & Work Related Disorders, Sport Sci, Fredrik Bajers Vej 7 D-3, DK-9220 Aalborg - Denmark

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY; v. 45, p. 1-10, APR 2019.
• Citações Web of Science: 0

Resumo

Purpose: The higher prevalence of work-related musculoskeletal disorders among women compared with men could be explained by sex-gender differences related to biological and physiological processes. The aim of this study was to evaluate sex differences in motor coordination during a sustained and repetitive motor task. Methods: Seventeen healthy females and 21 healthy males participated. The surface electromyography (sEMG) of the trapezius portions and serratus anterior were recorded. Root mean square (RMS) values were computed to assess the level of muscle activity. The standard deviation (SD) and coefficient of variation (CV) were computed as metrics of size of variability. The normalized mutual information (NMI) values were calculated as index of functional connectivity between muscles pairs. Results: Females had higher normalized RMS values for the upper trapezius (acromial fibers) and serratus anterior muscles compared with males. RMS decreased, SD and CV increased while NMI decreased for almost all muscle pairs over time. Conclusion: The present work showed some signs of sex differences in muscle coordination of the shoulder girdle during a sustained motor task, performed with the upper limb positioned below of the shoulder level. (AU)

• Processo FAPESP: 16/22386-6 - Efeito do gênero e da normalização do sinal eletromiográfico na ativação dos músculos trapézio e serrátil anterior durante atividade ocupacional repetitiva
• Beneficiário: Ana Beatriz de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular