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    Precision based guidelines for sub-maximal normalisation task selection for trunk extensor EMG

    Access Status
    Fulltext not available
    Authors
    Jackson, J.
    Mathiassen, Svend
    Callaghan, J.
    Dempsey, P.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Jackson, J. and Mathiassen, S. and Callaghan, J. and Dempsey, P. 2017. Precision based guidelines for sub-maximal normalisation task selection for trunk extensor EMG. Journal of Electromyography and Kinesiology. 37: pp. 41-51.
    Source Title
    Journal of Electromyography and Kinesiology
    DOI
    10.1016/j.jelekin.2017.07.001
    ISSN
    1050-6411
    School
    School of Physiotherapy and Exercise Science
    URI
    http://hdl.handle.net/20.500.11937/69168
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 The Authors Aim The object of this study was to quantify the contribution of sub-maximal normalisation to the overall variance of exposure parameters describing erector spinae (ES) activity, and to provide guidelines for task selection which minimize methodological variance. Methods ES EMG was measured from three locations (T9, L1 and L5 levels) on fifteen men performing a manual materials handling task in the laboratory on three separate days. Four repeats of each of eleven sub-maximal normalisation tasks (eight static, three dynamic) were collected, work data were normalised to each task and repeat, and exposure parameters calculated. The unique contribution of normalisation to the overall variance was determined for each task and exposure parameter using variance component analyses. Normalisation tasks were scored according to their relative contributions to the overall variance and coefficients of variation. Results A prone task, similar to the Biering-Sørensen test posture, was the most repeatable for all electrode locations and across all exposure parameters. Thoracic level normalisation typically showed poorer repeatability than lumbar normalisation. Discussion To maximize measurement precision, we recommend that future ES EMG studies employing sub-maximal normalisation utilise said prone task. An alternate normalisation task specific to thoracic level ES muscles may be warranted.

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