Spatial variation and inconsistency between estimates of onset of muscle activation from EMG and ultrasound.
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 ac...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
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Nature Publishing Group
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/50799 |
| _version_ | 1848758538673848320 |
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| author | Dieterich, A. Botter, A. Vieira, T. Peolsson, A. Petzke, F. Davey, Paul Falla, D. |
| author_facet | Dieterich, A. Botter, A. Vieira, T. Peolsson, A. Petzke, F. Davey, Paul Falla, D. |
| author_sort | Dieterich, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T09:45:35Z |
| format | Journal Article |
| id | curtin-20.500.11937-50799 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:45:35Z |
| publishDate | 2017 |
| publisher | Nature Publishing Group |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-507992017-09-13T15:34:50Z Spatial variation and inconsistency between estimates of onset of muscle activation from EMG and ultrasound. Dieterich, A. Botter, A. Vieira, T. Peolsson, A. Petzke, F. Davey, Paul Falla, D. 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. 2017 Journal Article http://hdl.handle.net/20.500.11937/50799 10.1038/srep42011 Nature Publishing Group unknown |
| spellingShingle | Dieterich, A. Botter, A. Vieira, T. Peolsson, A. Petzke, F. Davey, Paul Falla, D. Spatial variation and inconsistency between estimates of onset of muscle activation from EMG and ultrasound. |
| title | Spatial variation and inconsistency between estimates of onset of muscle activation from EMG and ultrasound. |
| title_full | Spatial variation and inconsistency between estimates of onset of muscle activation from EMG and ultrasound. |
| title_fullStr | Spatial variation and inconsistency between estimates of onset of muscle activation from EMG and ultrasound. |
| title_full_unstemmed | Spatial variation and inconsistency between estimates of onset of muscle activation from EMG and ultrasound. |
| title_short | Spatial variation and inconsistency between estimates of onset of muscle activation from EMG and ultrasound. |
| title_sort | spatial variation and inconsistency between estimates of onset of muscle activation from emg and ultrasound. |
| url | http://hdl.handle.net/20.500.11937/50799 |