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    Differences in motor variability among individuals performing a standardized short-cycle manual task

    Access Status
    Fulltext not available
    Authors
    Sandlund, J.
    Srinivasan, D.
    Heiden, M.
    Mathiassen, Svend
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Sandlund, J. and Srinivasan, D. and Heiden, M. and Mathiassen, S. 2017. Differences in motor variability among individuals performing a standardized short-cycle manual task. Human Movement Science. 51: pp. 17-26.
    Source Title
    Human Movement Science
    DOI
    10.1016/j.humov.2016.10.009
    ISSN
    0167-9457
    School
    School of Physiotherapy and Exercise Science
    URI
    http://hdl.handle.net/20.500.11937/69028
    Collection
    • Curtin Research Publications
    Abstract

    � 2016 Elsevier B.V. Motor variability (MV) has been suggested to be a determinant of the risk for developing musculoskeletal disorders in repetitive work. In this study we examined whether individuals consistently differed in the extent of motor variability when performing a standardized short-cycle manual task. On three separate days, arm kinematics was recorded in 14 healthy subjects performing a pipetting task, transferring liquid from a pick-up tube to eight target tubes with a cycle time of 2.8�s. Cycle-to-cycle standard deviations (SD) of a large selection of shoulder and elbow kinematic variables, were processed using principal component analysis (PCA). Thereafter, between-subjects and between-days (within-subject) variance components were calculated using a random effects model for each of four extracted principal components. The results showed that MV differed consistently between subjects (95% confidence intervals of the between-subjects variances did not include zero) and that subjects differed consistently in MV between days. Thus, our results support the notion that MV may be a consistent personal trait, even though further research is needed to verify whether individuals rank consistently in MV even across tasks. If so, MV may be a candidate determinant of the risk of developing fatigue and musculoskeletal disorders in repetitive occupational work.

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