Document Detail

Transcranial magnetic stimulation during resistance training of the tibialis anterior muscle.
MedLine Citation:
PMID:  16891123     Owner:  NLM     Status:  MEDLINE    
During the first few weeks of resistance training, maximal voluntary contraction (MVC) force increases at a faster rate than can be accounted for by increases in protein synthesis. This early increase in MVC force has been attributed to neural mechanisms but the sources have not been identified. The purpose of this study was to measure changes in cortical excitability with transcranial magnetic stimulation during 4 weeks of resistance training of the tibialis anterior muscle. Ten individuals performed 6 sets of 10 MVCs 3 times per week for 4 weeks and ten participated as a control group. There were no changes in any parameters tested in the control group over the 4 weeks. In the training group, TA muscle strength increased significantly by 10% at week 2 and by 18% at week 4. As hypothesized, cortical excitability during resistance training also increased. The amplitude of the TA surface EMG motor evoked potential elicited by TMS during a low-level contraction increased by 32% after training with no change in the M-wave. These data indicate that there may be an increase in cortical excitability during the first few weeks of resistance training of the TA muscle.
L Griffin; E Cafarelli
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-08-07
Journal Detail:
Title:  Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology     Volume:  17     ISSN:  1050-6411     ISO Abbreviation:  J Electromyogr Kinesiol     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-06-11     Completed Date:  2007-08-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9109125     Medline TA:  J Electromyogr Kinesiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  446-52     Citation Subset:  IM    
Department of Kinesiology and Health Education, University of Texas at Austin, Austin, TX, USA.
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MeSH Terms
Case-Control Studies
Evoked Potentials, Motor / physiology
Leg / physiology*
Muscle Contraction / physiology
Muscle Strength / physiology
Muscle, Skeletal / physiology*
Physical Education and Training / methods*
Transcranial Magnetic Stimulation*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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