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    Spatial variation and inconsistency between estimates of onset of muscle activation from EMG and ultrasound.

    Access Status
    Open access via publisher
    Authors
    Dieterich, A.
    Botter, A.
    Vieira, T.
    Peolsson, A.
    Petzke, F.
    Davey, Paul
    Falla, D.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Dieterich, A. and Botter, A. and Vieira, T. and Peolsson, A. and Petzke, F. and Davey, P. and Falla, D. 2017. Spatial variation and inconsistency between estimates of onset of muscle activation from EMG and ultrasound.. Scientific Reports. 7.
    Source Title
    Scientific Reports
    DOI
    10.1038/srep42011
    School
    School of Physiotherapy and Exercise Science
    URI
    http://hdl.handle.net/20.500.11937/50799
    Collection
    • Curtin Research Publications
    Abstract

    Delayed onset of muscle activation can be a descriptor of impaired motor control. Activation onset can be estimated from electromyography (EMG)-registered muscle excitation and from ultrasound-registered muscle motion, which enables non-invasive measurements in deep muscles. However, in voluntary activation, EMG- and ultrasound-detected activation onsets may not correspond. To evaluate this, ten healthy men performed isometric elbow flexion at 20% to 70% of their maximal force. Utilising a multi-channel electrode transparent to ultrasound, EMG and M(otion)-mode ultrasound were recorded simultaneously over the biceps brachii muscle. The time intervals between automated and visually estimated activation onsets were correlated with the regional variation of EMG and muscle motion onset, contraction level and speed. Automated and visual onsets indicated variable time intervals between EMG- and motion onset, median (interquartile range) 96 (121) ms and 48 (72) ms, respectively. In 17% (computed analysis) or 23% (visual analysis) of trials, motion onset was detected before local EMG onset. Multi-channel EMG and M-mode ultrasound revealed regional differences in activation onset, which decreased with higher contraction speed (Spearman ??=?0.45, P?<?0.001). In voluntary activation the heterogeneous motor unit recruitment together with immediate motion transmission may explain the high variation of the time intervals between local EMG- and ultrasound-detected activation onset.

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