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Fatigue-induced increase in movement variability does not come at a cost of worse performance in a repetitive pointing task
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences. (Centrum för belastningsskadeforskning, Centre for Musculoskeletal Research)ORCID iD: 0000-0001-9327-6177
Department of Kinesiology and Physical Education, McGill University.
Department of Kinesiology and Physical Education, McGill University.
(English)In: PLoS ONE, ISSN 1932-6203Article in journal (Refereed) Submitted
Abstract [en]

Neuromuscular strategies employed in multijoint movements during repetitive motion-induced fatigue are still unclear, and movement variability may present a novel way to understand the compensatory control mechanisms that occur during fatigue. The aim of this study was to assess changes in shoulder and elbow joint kinematic variabilities and shoulder-elbow coordination variability associated with neck-shoulder fatigue, and whether these changes affected the spatio-temporal aspects of task performance. Nineteen healthy young adults continuously performed a repetitive pointing task between two targets placed in front of them at shoulder height at 1 Hz until fatigue (Borg CR10 rating of 8). Shoulder and elbow kinematics were recorded and used to compute shoulder abduction-adduction and elbow flexion-extension joint angles, and fingertip trajectories were used to compute the movement time and 3D spatial coordinates of the endpoint in each repetitive pointing movement cycle. Cycle-to-cycle movement variability of the shoulder and elbow joint angles from 15 consecutive forward pointing movements and cycle-to-cycle variability of continuous relative phase between the shoulder and elbow joint angles were compared between the first (baseline) and last (fatigue-terminal) minutes of performance. Shoulder kinematic variability and shoulder-elbow coordination variability were found to significantly increase with fatigue (by 60% and 30% of their respective baseline values). However, movement timing errors and spatial variability of the endpoint were found to be unchanged with fatigue. Results suggest that fatigue-related increase in shoulder variability may have been compensated by changes in shoulder-elbow coordination with an overall task performance objective and associated hierarchical control mechanisms.

Place, publisher, year, edition, pages
Springer.
Keyword [en]
multijoint movements, arm kinematics, fatigue, coordination variability, relative phase, performance metrics
National Category
Environmental Health and Occupational Health
Identifiers
URN: urn:nbn:se:hig:diva-20099OAI: oai:DiVA.org:hig-20099DiVA: diva2:846331
Projects
motorvar
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2011-0075
Available from: 2015-08-16 Created: 2015-08-16 Last updated: 2015-10-05Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
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  • de-DE
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  • en-US
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