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Trapezius muscle ac...
Trapezius muscle activity increases during near work activity regardless of accommodation/vergence demand level
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- Richter, Hans, 1961- (author)
- Högskolan i Gävle,Arbetshälsovetenskap,Centrum för belastningsskadeforskning
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- Zetterberg, Camilla (author)
- Uppsala universitet,Högskolan i Gävle,Arbetshälsovetenskap,Centrum för belastningsskadeforskning,Section of Occupational and Environmental Medicine, Department of Medical Sciences, Uppsala University, Uppsala, Sweden,Arbets- och miljömedicin,University of Gävle, Department of Occupational and Public Health Sciences, Centre for Musculoskeletal Research
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- Forsman, Mikael (author)
- Karolinska Institutet,Högskolan i Gävle,Arbetshälsovetenskap,Centrum för belastningsskadeforskning,Division of Occupational and Environmental Medicine, Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden,Department of Occupational and Public Health Sciences, Faculty of Health and Occupational Studies, Centre for Musculoskeletal Research, University of Gävle, Gävle, 801 76, Sweden; Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
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(creator_code:org_t)
- 2015-02-20
- 2015
- English.
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In: European Journal of Applied Physiology. - : Springer Science and Business Media LLC. - 1439-6319 .- 1439-6327. ; 115:7, s. 1501-1512
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Abstract
Subject headings
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- AimTo investigate if trapezius muscle activity increases over time during visually demanding near work.MethodsThe vision task consisted of sustained focusing on a contrast-varying black and white Gabor grating. Sixty-six participants with a median age of 38 (range 19–47) fixated the grating from a distance of 65 cm (1.5 D) during four counterbalanced 7-min periods: binocularly through −3.5 D lenses, and monocularly through −3.5 D, 0 D and +3.5 D. Accommodation, heart rate variability and trapezius muscle activity were recorded in parallel.ResultsGeneral estimating equation analyses showed that trapezius muscle activity increased significantly over time in all four lens conditions. A concurrent effect of accommodation response on trapezius muscle activity was observed with the minus lenses irrespective of whether incongruence between accommodation and convergence was present or not.ConclusionsTrapezius muscle activity increased significantly over time during the near work task. The increase in muscle activity over time may be caused by an increased need of mental effort and visual attention to maintain performance during the visual tasks to counteract mental fatigue.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap -- Arbetsmedicin och miljömedicin (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences -- Occupational Health and Environmental Health (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Produktionsteknik, arbetsvetenskap och ergonomi (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Production Engineering, Human Work Science and Ergonomics (hsv//eng)
Keyword
- Attention fatigue
- Accommodation
- Békésy test
- Compensatory effort
- Contrast threshold tracking
- Electromyography
- Visual ergonomics
Publication and Content Type
- ref (subject category)
- art (subject category)
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