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Eye-lens accommodation load and static trapezius muscle activity
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, CBF. University of Gävle, Centre for Musculoskeletal Research.
Division of Occupational and Environmental Medicine, Department of Public Health Sciences, Karolinska Institutet, Sweden.
2011 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 111, no 1, p. 29-36Article in journal (Refereed) Published
Abstract [en]

The purpose of this experimental study was to investigate if sustained periods of oculomotor load impacts on neck/scapular area muscle activity. The static trapezius muscle activity was assessed from bipolar surface electromyography, normalized to a submaximal contraction. Twenty-eight subjects with a mean age of 29 (range 19–42, SD 8) viewed a high-contrast fixation target for two 5-min periods through: (1) -3.5 dioptre (D) lenses; and (2) 0 D lenses. The target was placed 5 D away from the individual’s near point of accommodation. Each subject’s ability to compensate for the added blur was extracted via infrared photorefraction measurements. Subjects whose accommodative response was higher in the -D blur condition (1) showed relatively more static bilateral trapezius muscle activity level. During no blur (2) there were no signs of relationships. The results indicate that sustained eye-lens accommodation at near, during ergonomically unfavourable viewing conditions, could possibly represent a risk factor for trapezius muscle myalgia.

Place, publisher, year, edition, pages
2011. Vol. 111, no 1, p. 29-36
Keywords [en]
Accommodation, Cinderella hypothesis, Defocus, Electromyography, Near-work
National Category
Occupational Health and Environmental Health
Identifiers
URN: urn:nbn:se:hig:diva-7762DOI: 10.1007/s00421-010-1629-xISI: 000285786800004PubMedID: 20803295Scopus ID: 2-s2.0-79651473160OAI: oai:DiVA.org:hig-7762DiVA, id: diva2:355874
Available from: 2010-10-08 Created: 2010-10-08 Last updated: 2018-03-13Bibliographically approved

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Richter, Hans O.Bänziger, Tanja

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