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  • 1.
    Cid, Marina Machado
    et al.
    Federal University of São Carlos, Brazil.
    Januario, Leticia
    Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbetshälsovetenskap och psykologi, Arbetshälsovetenskap. Federal University of São Carlos, Brazil.
    Moreira, Roberta de Fátima Carreira
    Federal University of São Carlos, Brazil.
    Côté, Julie N
    McGill University.
    Madeleine, Pascal
    Aalborg University.
    Oliveira, Ana Beatriz
    Federal University of São Carlos, Brazil.
    Does sEMG normalization change results on sex differences in the activation of the shoulder girdle muscles during a simulated work task?2020Ingår i: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 85, artikel-id 103044Artikel i tidskrift (Refereegranskat)
    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.

  • 2.
    Januario, Leticia
    et al.
    Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbetshälsovetenskap och psykologi, Arbetshälsovetenskap.
    Karstad, Kristina
    National Research Centre for the Working Environment, Copenhagen, Dk.
    Rugulies, Reiner
    National Research Centre for the Working Environment, Copenhagen, Dk.
    Bergström, Gunnar
    Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbetshälsovetenskap och psykologi, Arbetshälsovetenskap. Högskolan i Gävle, Centrum för belastningsskadeforskning.
    Holtermann, Andreas
    National Research Centre for the Working Environment, Copenhagen, Dk.
    Hallman, David
    Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbetshälsovetenskap och psykologi, Arbetshälsovetenskap. Högskolan i Gävle, Centrum för belastningsskadeforskning.
    Association between psychosocial working conditions and perceived physical exertion among eldercare workers: a cross-sectional multilevel analysis of nursing homes, wards and workers2019Ingår i: International Journal of Environmental Research and Public Health, ISSN 1661-7827, E-ISSN 1660-4601, Vol. 16, nr 19, artikel-id 3610Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This cross-sectional multilevel study aims at investigating the associations between psychosocial working conditions of different workplace levels and perceived physical exertion among eldercare workers. Data were obtained from the ‘Danish Observational Study of Eldercare work and musculoskeletal disorderS’ (DOSES) study, including 536 eldercare workers, nested in 126 wards and 20 nursing homes. Psychosocial working conditions were measured by the Copenhagen Psychosocial Questionnaire (COPSOQ). The physical workload was measured with a self-administered scale (0–10) rating perceived physical exertion. Multilevel linear mixed models were used to determine associations of psychosocial conditions between nursing homes, wards, and workers with physical exertion. Most of the variance in the perceived physical exertion was explained by differences between workers (83%), but some variance was explained by wards (11%) and nursing homes (6%). Workers employed in nursing homes with low influence (p = 0.01) and poor leadership (p = 0.02), and in wards with high quantitative demands (p = 0.03), high work pace (p < 0.001), and low justice (p = 0.01) were at increased risk of reporting higher physical exertion. The strongest associations were found for low influence, low quality of leadership, and high work pace at nursing homes and ward levels. In conclusion, improving specific psychosocial working conditions at nursing home and ward levels may be of particular importance to reduce excessive physical workload in eldercare workers

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