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Cid, M. M., Januario, L., Moreira, R. d., Côté, J. N., Madeleine, P. & Oliveira, A. B. (2020). Does sEMG normalization change results on sex differences in the activation of the shoulder girdle muscles during a simulated work task?. Applied Ergonomics, 85, Article ID 103044.
Open this publication in new window or tab >>Does sEMG normalization change results on sex differences in the activation of the shoulder girdle muscles during a simulated work task?
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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
Keywords
Gender differences, Neck/shoulder, Repetitive task
National Category
Health Sciences Physiology
Identifiers
urn:nbn:se:hig:diva-31450 (URN)10.1016/j.apergo.2020.103044 (DOI)31932265 (PubMedID)2-s2.0-85077506621 (Scopus ID)
Available from: 2020-01-17 Created: 2020-01-17 Last updated: 2020-01-22Bibliographically approved
Januario, L., Karstad, K., Rugulies, R., Bergström, G., Holtermann, A. & Hallman, D. (2019). Association between psychosocial working conditions and perceived physical exertion among eldercare workers: a cross-sectional multilevel analysis of nursing homes, wards and workers. International Journal of Environmental Research and Public Health, 16(19), Article ID 3610.
Open this publication in new window or tab >>Association between psychosocial working conditions and perceived physical exertion among eldercare workers: a cross-sectional multilevel analysis of nursing homes, wards and workers
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2019 (English)In: International Journal of Environmental Research and Public Health, ISSN 1661-7827, E-ISSN 1660-4601, Vol. 16, no 19, article id 3610Article in journal (Refereed) Published
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

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
healthcare; multilevel analysis; nursing home; physical exertion; psychosocial factors; workload
National Category
Occupational Health and Environmental Health
Research subject
Health-Promoting Work
Identifiers
urn:nbn:se:hig:diva-30694 (URN)10.3390/ijerph16193610 (DOI)000494748600106 ()31561538 (PubMedID)2-s2.0-85072716023 (Scopus ID)
Projects
AFA - DOSHIG
Funder
AFA Insurance, 180076
Available from: 2019-09-26 Created: 2019-09-26 Last updated: 2020-01-24Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-2844-3757

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