Heterogeneity of muscle activation in relation to force direction: A multi-channel surface electromyography study on the triceps surae muscle
Several skeletal muscles can be divided into sub-modules, called neuromuscular compartments (NMCs), which are thought to be controlled independently and to have distinct biomechanical functions. We looked for distinct muscle activation patterns in the triceps surae muscle (TS) using surface electrom...
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| Published in | Journal of electromyography and kinesiology Vol. 19; no. 5; pp. 882 - 895 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
England
Elsevier Ltd
01.10.2009
|
| Subjects | |
| Online Access | Get full text |
| ISSN | 1050-6411 1873-5711 1873-5711 |
| DOI | 10.1016/j.jelekin.2008.04.013 |
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| Abstract | Several skeletal muscles can be divided into sub-modules, called neuromuscular compartments (NMCs), which are thought to be controlled independently and to have distinct biomechanical functions. We looked for distinct muscle activation patterns in the triceps surae muscle (TS) using surface electromyography (EMG) during voluntary contraction. Nine subjects performed isometric and isotonic plantar flexions combined with forces along pre-defined directions. Besides the forces under the ball of the foot, multi-channel surface EMG was measured with electrodes homogeneously distributed over the entire TS. Using principal component analysis, common (global) components were omitted from the EMG signals, thereby estimating muscle activity sufficiently accurate to track fine fluctuations of force during an isotonic contraction (
r
=
0.80
±
0.09). A subsequent cluster analysis showed a topographical organization of co-activated parts of the muscle that was different between subjects. Low and negative correlations between the EMG activity within clusters were found, indicating a substantial heterogeneity of TS activation. The correlations between cluster time series and forces at the foot in specific directions differed substantially between clusters, showing that the differentially activated parts of the TS had specific biomechanical functions. |
|---|---|
| AbstractList | Several skeletal muscles can be divided into sub-modules, called neuromuscular compartments (NMCs), which are thought to be controlled independently and to have distinct biomechanical functions. We looked for distinct muscle activation patterns in the triceps surae muscle (TS) using surface electromyography (EMG) during voluntary contraction. Nine subjects performed isometric and isotonic plantar flexions combined with forces along pre-defined directions. Besides the forces under the ball of the foot, multi- channel surface EMG was measured with electrodes homogeneously distributed over the entire TS. Using principal component analysis, common (global) components were omitted from the EMG signals, thereby estimating muscle activity sufficiently accurate to track fine fluctuations of force during an isotonic contraction (r = 0.80 +/- 0.09). A subsequent cluster analysis showed a topographical organization of co-activated parts of the muscle that was different between subjects. Low and negative correlations between the EMG activity within clusters were found, indicating a substantial heterogeneity of TS activation. The correlations between cluster time series and forces at the foot in specific directions differed substantially between clusters, showing that the differentially activated parts of the TS had specific biomechanical functions. Several skeletal muscles can be divided into sub-modules, called neuromuscular compartments (NMCs), which are thought to be controlled independently and to have distinct biomechanical functions. We looked for distinct muscle activation patterns in the triceps surae muscle (TS) using surface electromyography (EMG) during voluntary contraction. Nine subjects performed isometric and isotonic plantar flexions combined with forces along pre-defined directions. Besides the forces under the ball of the foot, multi-channel surface EMG was measured with electrodes homogeneously distributed over the entire TS. Using principal component analysis, common (global) components were omitted from the EMG signals, thereby estimating muscle activity sufficiently accurate to track fine fluctuations of force during an isotonic contraction ( r = 0.80 ± 0.09). A subsequent cluster analysis showed a topographical organization of co-activated parts of the muscle that was different between subjects. Low and negative correlations between the EMG activity within clusters were found, indicating a substantial heterogeneity of TS activation. The correlations between cluster time series and forces at the foot in specific directions differed substantially between clusters, showing that the differentially activated parts of the TS had specific biomechanical functions. Several skeletal muscles can be divided into sub-modules, called neuromuscular compartments (NMCs), which are thought to be controlled independently and to have distinct biomechanical functions. We looked for distinct muscle activation patterns in the triceps surae muscle (TS) using surface electromyography (EMG) during voluntary contraction. Nine subjects performed isometric and isotonic plantar flexions combined with forces along pre-defined directions. Besides the forces under the ball of the foot, multi-channel surface EMG was measured with electrodes homogeneously distributed over the entire TS. Using principal component analysis, common (global) components were omitted from the EMG signals, thereby estimating muscle activity sufficiently accurate to track fine fluctuations of force during an isotonic contraction (r=0.80+/-0.09). A subsequent cluster analysis showed a topographical organization of co-activated parts of the muscle that was different between subjects. Low and negative correlations between the EMG activity within clusters were found, indicating a substantial heterogeneity of TS activation. The correlations between cluster time series and forces at the foot in specific directions differed substantially between clusters, showing that the differentially activated parts of the TS had specific biomechanical functions.Several skeletal muscles can be divided into sub-modules, called neuromuscular compartments (NMCs), which are thought to be controlled independently and to have distinct biomechanical functions. We looked for distinct muscle activation patterns in the triceps surae muscle (TS) using surface electromyography (EMG) during voluntary contraction. Nine subjects performed isometric and isotonic plantar flexions combined with forces along pre-defined directions. Besides the forces under the ball of the foot, multi-channel surface EMG was measured with electrodes homogeneously distributed over the entire TS. Using principal component analysis, common (global) components were omitted from the EMG signals, thereby estimating muscle activity sufficiently accurate to track fine fluctuations of force during an isotonic contraction (r=0.80+/-0.09). A subsequent cluster analysis showed a topographical organization of co-activated parts of the muscle that was different between subjects. Low and negative correlations between the EMG activity within clusters were found, indicating a substantial heterogeneity of TS activation. The correlations between cluster time series and forces at the foot in specific directions differed substantially between clusters, showing that the differentially activated parts of the TS had specific biomechanical functions. AbstractSeveral skeletal muscles can be divided into sub-modules, called neuromuscular compartments (NMCs), which are thought to be controlled independently and to have distinct biomechanical functions. We looked for distinct muscle activation patterns in the triceps surae muscle (TS) using surface electromyography (EMG) during voluntary contraction. Nine subjects performed isometric and isotonic plantar flexions combined with forces along pre-defined directions. Besides the forces under the ball of the foot, multi-channel surface EMG was measured with electrodes homogeneously distributed over the entire TS. Using principal component analysis, common (global) components were omitted from the EMG signals, thereby estimating muscle activity sufficiently accurate to track fine fluctuations of force during an isotonic contraction ( r= 0.80 ± 0.09). A subsequent cluster analysis showed a topographical organization of co-activated parts of the muscle that was different between subjects. Low and negative correlations between the EMG activity within clusters were found, indicating a substantial heterogeneity of TS activation. The correlations between cluster time series and forces at the foot in specific directions differed substantially between clusters, showing that the differentially activated parts of the TS had specific biomechanical functions. |
| Author | Kingma, I. Stegeman, D.F. van Dieën, J.H. Staudenmann, D. Daffertshofer, A. |
| Author_xml | – sequence: 1 givenname: D. surname: Staudenmann fullname: Staudenmann, D. organization: Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, Vander Boechorstraat 9, 1081 BT Amsterdam, The Netherlands – sequence: 2 givenname: I. surname: Kingma fullname: Kingma, I. organization: Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, Vander Boechorstraat 9, 1081 BT Amsterdam, The Netherlands – sequence: 3 givenname: A. surname: Daffertshofer fullname: Daffertshofer, A. organization: Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, Vander Boechorstraat 9, 1081 BT Amsterdam, The Netherlands – sequence: 4 givenname: D.F. surname: Stegeman fullname: Stegeman, D.F. organization: Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, Vander Boechorstraat 9, 1081 BT Amsterdam, The Netherlands – sequence: 5 givenname: J.H. surname: van Dieën fullname: van Dieën, J.H. email: j.vandieen@fbw.vu.nl organization: Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, Vander Boechorstraat 9, 1081 BT Amsterdam, The Netherlands |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/18556216$$D View this record in MEDLINE/PubMed |
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| Keywords | Human Cluster analysis Muscle force Surface electromyography Neuromuscular compartments Directional tuning Principal component analysis |
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| Snippet | Several skeletal muscles can be divided into sub-modules, called neuromuscular compartments (NMCs), which are thought to be controlled independently and to... AbstractSeveral skeletal muscles can be divided into sub-modules, called neuromuscular compartments (NMCs), which are thought to be controlled independently... |
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| SubjectTerms | Adult Algorithms Anisotropy Ankle Joint - physiology Cluster analysis Computer Simulation Directional tuning Electromyography - methods Female Human Humans Male Models, Biological Muscle Contraction - physiology Muscle force Muscle, Skeletal - physiology Neuromuscular compartments Physical Medicine and Rehabilitation Principal Component Analysis Stress, Mechanical Surface electromyography |
| Title | Heterogeneity of muscle activation in relation to force direction: A multi-channel surface electromyography study on the triceps surae muscle |
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