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Effect of ciliary-muscle contraction force on trapezius muscle activity during computer mouse work
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational Health Science. University of Gävle, Centre for Musculoskeletal Research.
Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.; KTH Royal Institute of Technology, Stockholm, Sweden.
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational Health Science. University of Gävle, Centre for Musculoskeletal Research.
2019 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 119, no 2, p. 389-397Article in journal (Refereed) Published
Abstract [en]

The present study aimed to identify whether or not an increase in ciliary-muscle contraction force, when the eye-lens is adjusted for viewing at a near distance, result in an increase in trapezius muscle activity, while performing a natural work task. Twelve participants, ranging in age from 21 to 32 years, performed a computer-mouse work task during free gaze conditions. A moving visual target was tracked with a computer mouse on a screen placed at two different distances from the eyes, 25 cm and 50 cm. Tracking performance, eye accommodation, and bilateral trapezius muscle activity were measured continuously. Ciliary-muscle contraction force was computed according to a formula which takes into account the age-dependent, non-linear relationship between contraction force of the ciliary muscle and the produced level of eye accommodation. Generalized Estimating Equations analyses were performed. On the dominant hand side and for the nearest screen distance, there was a significant effect of ciliary-muscle contraction force on the trapezius muscle activity (p<0.001). No other effects were significant (p>0.05). The results support the hypothesis that high visual demands, during computer mouse work, increase ciliary muscle contraction force and contribute to a raise of the sustained level of trapezius muscle activity. The current study specifically clarifies the validity of the relationship between ciliary-muscle contraction force and trapezius muscle activity and demonstrates that this relationship is not due to a general personal trait. We conclude that a high level of ciliary muscle contraction force can contribute to a development of musculoskeletal complaints in the neck-shoulder area.

Place, publisher, year, edition, pages
2019. Vol. 119, no 2, p. 389-397
Keywords [en]
Ciliary-muscle contraction force; Computer mouse work; Electromyography; Eye-accommodation; Trapezius muscle; Visual ergonomics
National Category
Occupational Health and Environmental Health
Identifiers
URN: urn:nbn:se:hig:diva-26194DOI: 10.1007/s00421-018-4031-8ISI: 000457735500006PubMedID: 30430279Scopus ID: 2-s2.0-85056460114OAI: oai:DiVA.org:hig-26194DiVA, id: diva2:1186809
Part of project
Forte-centre Working Life: The Body at Work - from problem to potential, Forte
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1761Available from: 2018-03-01 Created: 2018-03-01 Last updated: 2019-08-09Bibliographically approved

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Domkin, DmitryForsman, MikaelRichter, Hans O.

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CiteExportLink to record
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