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| Research article summary (published May 2002): |
EMG discharge patterns during human grip movement are task-dependent and not modulated by muscle contraction modes: a transcranial magnetic stimulation (TMS) study.
Full Abstract
Our previous study revealed that, during tonic muscle contraction, remarkable functional differences among intrinsic and extrinsic muscles were observed during two different grip movements, i.e., precision and power grips. To verify whether this evidence is true even under the phasic muscle contraction, magnetic stimulation was delivered over the left scalp while a normal human subject performed phasic precision or power grip responses of the right-hand fingers in a simple reaction time (SRT) paradigm. Magnetic stimulation delivered during the latent period revealed different cortico-motoneuronal excitations between the two grip responses. In particular, the contributions of extensor carpi radialis (ECR) muscle were definitely different between the two grip responses, although motor-evoked potentials (MEPs) of first dorsal interosseous (FDI) prior to, and after EMG onset of movement initiation, were not different. These results were similar to previous results obtained during tonic muscle contraction. Thus, we have concluded that the task-dependent EMG discharge pattern in finger manipulation could not be modulated by muscle contraction modes.
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Author information
Author/s: Anson, J G (JG); Hasegawa, Y (Y); Kasai, T (T); Latash, M L (ML); Yahagi, S (S);
Affiliation: School of Physical Education, Division of Sciences, University of Otago, P.O. Box 56, Dunedin, New Zealand.
Journal and publication information
Publication Type: Journal Article
Journal: Brain research (Brain Res), published in Netherlands. (Language: eng)
Reference: 2002-May; vol 934 (issue 2) : pp 162-6
Dates: Created 2002/04/16; Completed 2002/08/07; Revised 2006/11/15;
PMID: 11955480, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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