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Spatial variation a...
Spatial variation and inconsistency between estimates of onset of muscle activation from EMG and ultrasound
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- Dieterich, Angela V. (author)
- University of Medical Centre, Germany
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- Botter, Alberto (author)
- Politecn Torino, Italy
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- 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
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- Petzke, Frank (author)
- University of Medical Centre, Germany
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- Davey, Paul (author)
- Curtin University, Australia
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- Falla, Deborah (author)
- University of Birmingham, England
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(creator_code:org_t)
- 2017-02-08
- 2017
- English.
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In: Scientific Reports. - : NATURE PUBLISHING GROUP. - 2045-2322. ; 7
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https://liu.diva-por... (primary) (Raw object)
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https://www.nature.c...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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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)
Publication and Content Type
- ref (subject category)
- art (subject category)
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