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Co-variation in time between near-far accommodation of the lens and trapezius muscle activity
Karolinska institute, Division of Occupational and Environmental Medicine, Department of Public Health Sciences.
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.ORCID iD: 0000-0002-2919-3921
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.
2012 (English)In: Work: A journal of Prevention, Assesment and rehabilitation, ISSN 1051-9815, E-ISSN 1875-9270, Vol. 41, no Suppl. 1, p. 3393-3397Article in journal (Refereed) Published
Abstract [en]

Visual strain and discomfort may contribute to the generation of work-related musculoskeletal disorders among e.g. computer workers. A positive correlation on a group level between eye-lens accommodation and trapezius muscle activity has been reported. In this study we investigated the possibility of a direct, fast, connection between lens accommodation and trapezius muscles activity. The subjects focused alternately on Near and Far targets, with a mean switch time of 5 s, through four different lenses. The cross-correlation, R(tau) was computed, between the time signals of accommodation and electromyography (EMG) from 23 subjects. In the overall mean R(tau) of 736 curves, a small but significant correlation peak (0.019) with a delay (of the EMG signal) of about 0.3 s, revealed a small common component in the two signals. Among the lenses, the positive lens (3.5 D), showed the highest correlation peak (0.040). The correlation may be caused by a direct “hard-wired” connection between the ciliary and trapezius muscles. But it could also be caused indirectly by the subject’s need for a more stable head in a more demanding visual task. The latter is supported by the result that the correlation was the highest in the positive lens condition. The present correlation is however weak and it has probably a low practical importance.

Place, publisher, year, edition, pages
2012. Vol. 41, no Suppl. 1, p. 3393-3397
Keywords [en]
Visual discomfort, cross-correlation, electromyography, visual strain, ciliary muscle
National Category
Occupational Health and Environmental Health
Identifiers
URN: urn:nbn:se:hig:diva-12088DOI: 10.3233/WOR-2012-0614-3393ISI: 000306361803085Scopus ID: 2-s2.0-84859837985OAI: oai:DiVA.org:hig-12088DiVA, id: diva2:534035
Conference
IEA 2012, The 18th World Congress on Ergonomics, February 12-16, 2012, Recife, Brazil.
Available from: 2012-06-15 Created: 2012-06-15 Last updated: 2018-03-13Bibliographically approved

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Lodin, CamillaRichter, Hans

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