Document Detail

Modulation of human corticomuscular beta-range coherence with low-level static forces.
MedLine Citation:
PMID:  18052988     Owner:  NLM     Status:  MEDLINE    
Although corticomuscular synchronization in the beta range (15-30 Hz) was shown to occur during weak steady-state contractions, an examination of low-level forces around 10% of the maximum voluntary contraction (MVC) is still missing. We addressed this question by investigating coherence between electroencephalogram (EEG) and electromyogram (EMG) as well as cortical spectral power during a visuomotor task. Eight healthy right-handed subjects compensated isometrically static forces at a level of 4% and 16% of MVC with their right index finger. While 4% MVC was accompanied by low coherence values in the middle to high beta frequency range (25-30 Hz), a significant increase of coherence mainly confined to low beta frequencies (19-20 Hz) was observed with force of 16% MVC. Furthermore, this increase was associated with better performance, as reflected in decreased relative error in force during 16% MVC. We additionally show that periods of good motor performance within each condition were associated with higher values of EEG-EMG coherence and spectral power. In conclusion, our results suggest a role for beta-range corticomuscular coherence in effective sensorimotor integration, thus stabilizing corticospinal communication.
Matthias Witte; Luis Patino; Agnieszka Andrykiewicz; Marie-Claude Hepp-Reymond; Rumyana Kristeva
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Publication Detail:
Type:  Journal Article     Date:  2007-12-04
Journal Detail:
Title:  The European journal of neuroscience     Volume:  26     ISSN:  1460-9568     ISO Abbreviation:  Eur. J. Neurosci.     Publication Date:  2007 Dec 
Date Detail:
Created Date:  2007-12-19     Completed Date:  2008-03-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8918110     Medline TA:  Eur J Neurosci     Country:  France    
Other Details:
Languages:  eng     Pagination:  3564-70     Citation Subset:  IM    
Neurological Clinic, Albert-Ludwigs-University, Breisacher Strasse 64, 79106 Freiburg, Germany.
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MeSH Terms
Beta Rhythm*
Cortical Synchronization*
Fingers / physiology
Muscle Contraction / physiology*
Muscle, Skeletal / physiology*
Psychomotor Performance / physiology*

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