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The size and structure of arm movement variability decreased with work pace in a standardised repetitive precision task
University of Gävle, Centre for Musculoskeletal Research. University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science.ORCID iD: 0000-0001-9327-6177
Center for Sensorimotor Interaction, Department of Health Science and Technology, Aalborg University.
University of Gävle, Centre for Musculoskeletal Research. University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Occupational health science.ORCID iD: 0000-0003-1443-6211
Center for Sensorimotor Interaction, Department of Health Science and Technology, Aalborg University.
2015 (English)In: Ergonomics, ISSN 0014-0139, E-ISSN 1366-5847, Vol. 58, no 1, 128-139 p.Article in journal (Refereed) Published
Abstract [en]

Increased movement variability has been suggested to reduce the risk of developing musculoskeletal disorders caused by repetitive work. This study investigated the effects of work pace on arm movement variability in a standardized repetitive pipetting task performed by 35 healthy women. During pipetting at slow and fast paces differing by 15%, movements of arm, hand and pipette were tracked in 3D, and used to derive shoulder and elbow joint angles. The size of cycle-to-cycle motor variability was quantified using standard deviations of several kinematics properties, while the structure of variability was quantified using indices of sample entropy and recurrence quantification analysis. When pace increased, both the size and structure of motor variability in the shoulder and elbow decreased. These results suggest that motor variability drops when repetitive movements are performed at increased paces, which may in the long run lead to undesirable outcomes such as muscle fatigue or over-use.

Place, publisher, year, edition, pages
Taylor & Francis, 2015. Vol. 58, no 1, 128-139 p.
Keyword [en]
motor control, cyclic movements, Fitts’ law, kinematics, linear and nonlinear variability
National Category
Environmental Health and Occupational Health
Identifiers
URN: urn:nbn:se:hig:diva-17006DOI: 10.1080/00140139.2014.957736ISI: 000347788100012PubMedID: 25216404Scopus ID: 2-s2.0-84921345732OAI: oai:DiVA.org:hig-17006DiVA: diva2:726274
Projects
Motorvar
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1761; 2011-0075
Available from: 2014-06-17 Created: 2014-06-17 Last updated: 2016-12-05Bibliographically approved

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CiteExportLink to record
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Citation style
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