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Effect of ciliary-muscle contraction force on trapezius muscle activity during computer mouse work
Univ Gavle, Fac Hlth & Occupat Studies, Dept Occupat & Publ Hlth Sci, Ctr Musculoskeletal Res, S-80176 Gavle, Sweden..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
Univ Gavle, Fac Hlth & Occupat Studies, Dept Occupat & Publ Hlth Sci, Ctr Musculoskeletal Res, S-80176 Gavle, Sweden..
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, results in an increase in trapezius muscle activity, while performing a natural work task. Twelve participants, ranging in age from 21 to 32years, 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, 25cm and 50cm. 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 the 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 personality 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
SPRINGER , 2019. Vol. 119, no 2, p. 389-397
Keywords [en]
Eye-accommodation, Ciliary-muscle contraction force, Computer mouse work, Electromyography, Trapezius muscle, Visual ergonomics
National Category
Physiology
Identifiers
URN: urn:nbn:se:kth:diva-244537DOI: 10.1007/s00421-018-4031-8ISI: 000457735500006PubMedID: 30430279Scopus ID: 2-s2.0-85056460114OAI: oai:DiVA.org:kth-244537DiVA, id: diva2:1302377
Note

QC 20190404

Available from: 2019-04-04 Created: 2019-04-04 Last updated: 2019-04-04Bibliographically approved

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Forsman, Mikael

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