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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.
Division of Occupational and Environmental Medicine, Department of Public Health Sciences, Karolinska Institute.
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.
2018 (English)In: Article in journal (Refereed) Submitted
Abstract [en]

The present study aimed to identify whether or not an increase in ciliary-muscle contraction force results in a proportional and individualized increase in the level of trapezius muscle activity. 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 computer screen placed at two different near distances, 25 cm and 50 cm. Tracking performance, eye refraction, and trapezius muscle activity were continuously measured and evaluated. Ciliary muscle-contraction force was computed from eye-lens accommodative responses. Generalized Estimating Equations analyses showed that trapezius muscle activity increased significantly with an increase in ciliary-muscle contraction force for only the right trapezius muscle, on the active side, and at the nearest screen distance (p < 0.001). No other effects were significant (p>0.05). The study supports the hypothesis that high visual demands, during computer mouse work, increase ciliary muscle contraction force and contribute to raise 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 critical level of ciliary muscle contraction force may contribute to the development of musculoskeletal complaints in the neck-shoulder area. 

Place, publisher, year, edition, pages
2018.
Keyword [en]
Accommodation · Ciliary-muscle contraction force · Computer mouse work· Electromyography · Trapezius muscle · Visual ergonomics
National Category
Occupational Health and Environmental Health
Identifiers
URN: urn:nbn:se:hig:diva-25767OAI: oai:DiVA.org:hig-25767DiVA: diva2:1163811
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1761
Available from: 2017-12-08 Created: 2017-12-08 Last updated: 2018-01-13Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard-cite-them-right
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • sv-SE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • de-DE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf