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

Dieterich, Angela V. (author)
University of Medical Centre, Germany
Botter, Alberto (author)
Politecn Torino, Italy
Martins Vieira, Taian (author)
Politecn Torino, Italy; University of Federal Rio de Janeiro, Brazil
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Peolsson, Anneli (author)
Linköpings universitet,Avdelningen för fysioterapi,Medicinska fakulteten
Petzke, Frank (author)
University of Medical Centre, Germany
Davey, Paul (author)
Curtin University, Australia
Falla, Deborah (author)
University of Birmingham, England
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 (creator_code:org_t)
2017-02-08
2017
English.
In: Scientific Reports. - : NATURE PUBLISHING GROUP. - 2045-2322. ; 7
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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 rho amp;gt;= 0.45, P amp;lt; 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.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Medicinteknik -- Annan medicinteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Medical Engineering -- Other Medical Engineering (hsv//eng)

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