Document Detail

Temporal aspects of passive movement-related corticomotor inhibition.
MedLine Citation:
PMID:  15541524     Owner:  NLM     Status:  MEDLINE    
We have previously shown that during rhythmic passive movement of the index finger, the amplitude of the motor evoke potential (MEP) of the first dorsal interosseous muscle (FDI) as the index finger moved through mid-range adduction, is significantly reduced compared to rest [Edwards, D. J., Thickbroom, G. W., Byrnes, M. L., Ghosh, S., & Mastaglia, F. L. (2002). Reduced corticomotor excitability with passive movement: A study using Transcranial Magnetic Stimulation. Human Movement Science 21, 533-540]. In the present study we have investigated the time-course of this phenomenon. We found that MEP amplitude was significantly reduced at the mid-range position in the first cycle of movement (50+/-6% of resting baseline values), and did not vary across subsequent cycles (10 cycles in 50 s), but that MEP amplitude returned to baseline values within 1s of cessation of movement. The results suggest that the pattern of afferent discharge set up by the kinematics of the movement acting at spinal or supraspinal levels underlies the inhibition observed, rather than an effect of central origin or a cumulative effect of ongoing cyclic movement.
Dylan J Edwards; Gary W Thickbroom; Michelle L Byrnes; Soumya Ghosh; Frank L Mastaglia
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Human movement science     Volume:  23     ISSN:  0167-9457     ISO Abbreviation:  Hum Mov Sci     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-11-15     Completed Date:  2005-03-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8300127     Medline TA:  Hum Mov Sci     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  379-87     Citation Subset:  IM    
Centre for Neuromuscular and Neurological Disorders, Australian Neuromuscular Research Institute, The University of Western Australia, 4th Floor, A block, Nedlands, WA 6009, Australia.
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MeSH Terms
Brain / physiology*
Evoked Potentials, Motor / physiology
Fingers / physiology
Middle Aged
Movement / physiology*
Neural Inhibition / physiology*
Time Factors

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