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    Variability in spatio-temporal pattern of trapezius activity and coordination of hand-arm muscles during a sustained repetitive dynamic task

    Access Status
    Fulltext not available
    Authors
    Samani, A.
    Srinivasan, D.
    Mathiassen, Svend
    Madeleine, P.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Samani, A. and Srinivasan, D. and Mathiassen, S. and Madeleine, P. 2017. Variability in spatio-temporal pattern of trapezius activity and coordination of hand-arm muscles during a sustained repetitive dynamic task. Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale.. 235 (2): pp. 389-400.
    Source Title
    Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale.
    DOI
    10.1007/s00221-016-4798-y
    ISSN
    0014-4819
    School
    School of Physiotherapy and Exercise Science
    URI
    http://hdl.handle.net/20.500.11937/68726
    Collection
    • Curtin Research Publications
    Abstract

    � 2016, Springer-Verlag Berlin Heidelberg. The spatio-temporal distribution of muscle activity has been suggested to be a determinant of fatigue development. Pursuing this hypothesis, we investigated the pattern of muscular activity in the shoulder and arm during a repetitive dynamic task performed until participants’ rating of perceived exertion reached 8 on Borg’s CR-10 scale. We collected high-density surface electromyogram (HD-EMG) over the upper trapezius, as well as bipolar EMG from biceps brachii, triceps brachii, deltoideus anterior, serratus anterior, upper and lower trapezius from 21 healthy women. Root-mean-square (RMS) and mean power frequency (MNF) were calculated for all EMG signals. The barycenter of RMS values over the HD-EMG grid was also determined, as well as normalized mutual information (NMI) for each pair of muscles. Cycle-to-cycle variability of these metrics was also assessed. With time, EMG RMS increased for most of the muscles, and MNF decreased. Trapezius activity became higher on the lateral side than on the medial side of the HD-EMG grid and the barycenter moved in a lateral direction. NMI between muscle pairs increased with time while its variability decreased. The variability of the metrics during the initial 10�% of task performance was not associated with the time to task termination. Our results suggest that the considerable variability in force and posture contained in the dynamic task per se masks any possible effects of differences between subjects in initial motor variability on the rate of fatigue development.

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