Ciliary muscle contraction force and trapezius muscle activity during manual tracking of a moving visual target |
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| Affiliation: | 1. Centre for Musculoskeletal Research, Department of Occupational and Public Health Sciences, Faculty of Health and Occupational Studies, University of Gävle, Gävle, Sweden;2. Institute of Environmental Medicine, Karolinska Institute, Stockholm, Sweden;1. Department of Ophthalmology, Goethe-University, Frankfurt, Germany;2. California Eye Institute, Fresno, California;3. Department of Ophthalmology, University of British Columbia, Vancouver, Canada, and Pacific Laser Eye Centre, Vancouver, Canada;1. Department of Surgery, University of Michigan Health Systems, Ann Arbor, MI;2. Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI;3. Department of Surgery, Spectrum Health Medical Group, MI;4. Center for Healthcare Outcomes and Policy, University of Michigan, Ann Arbor, MI;5. Ann Arbor VA Healthcare System, Ann Arbor, MI;6. Wayne State University and Department of Surgery, Henry Ford Health System, Detroit, MI |
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| Abstract: | Previous studies have shown an association of visual demands during near work and increased activity of the trapezius muscle. Those studies were conducted under stationary postural conditions with fixed gaze and artificial visual load. The present study investigated the relationship between ciliary muscle contraction force and trapezius muscle activity across individuals during performance of a natural dynamic motor task under free gaze conditions. Participants (N = 11) tracked a moving visual target with a digital pen on a computer screen. Tracking performance, eye refraction and trapezius muscle activity were continuously measured. Ciliary muscle contraction force was computed from eye accommodative response. There was a significant Pearson correlation between ciliary muscle contraction force and trapezius muscle activity on the tracking side (0.78, p < 0.01) and passive side (0.64, p < 0.05). The study supports the hypothesis that high visual demands, leading to an increased ciliary muscle contraction during continuous eye–hand coordination, may increase trapezius muscle tension and thus contribute to the development of musculoskeletal complaints in the neck–shoulder area. Further experimental studies are required to clarify whether the relationship is valid within each individual or may represent a general personal trait, when individuals with higher eye accommodative response tend to have higher trapezius muscle activity. |
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| Keywords: | Ciliary muscle Trapezius muscle Near work |
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