Document Detail


Changes in corticomotor excitability after fatiguing muscle contractions.
MedLine Citation:
PMID:  11102907     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To investigate whether the type and duration of activity influences corticomotor excitability following fatiguing exercise, we compared motor evoked potential (MEP) responses of the biceps brachii to transcranial magnetic stimulation (TMS) during recovery from two different exercise regimens. Responses were recorded in both the resting state and during a weak contraction. Ten subjects performed a 60-s maximal voluntary contraction (MVC) and, on a subsequent occasion, a sustained 20% MVC to the point of exhaustion. Resting MEP amplitude declined following maximal and submaximal protocols, reaching 34% and 31% of pre-exercise means, respectively (P < 0.001 for both). In contrast, mean facilitated MEP amplitude showed a smaller and more transient decrement following the sustained submaximal effort (64%; P < 0.05), but not the 60-s MVC. Abolition of the postexercise depression in resting MEP amplitude by a weak tonic contraction indicates that decreases in excitability at the spinal level contribute to the reduced corticomotor excitability observed after fatiguing exercise.
Authors:
P Sacco; G W Thickbroom; M L Byrnes; F L Mastaglia
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Muscle & nerve     Volume:  23     ISSN:  0148-639X     ISO Abbreviation:  Muscle Nerve     Publication Date:  2000 Dec 
Date Detail:
Created Date:  2000-12-12     Completed Date:  2000-12-22     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7803146     Medline TA:  Muscle Nerve     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1840-6     Citation Subset:  IM    
Copyright Information:
Copyright 2000 John Wiley & Sons, Inc.
Affiliation:
Centre for Neuromuscular and Neurological Disorders, Australian Neuromuscular Research Institute, University of Western Australia, Queen Elizabeth II Medical Centre, Perth, Western Australia 6009, Australia. psacco@cyllene.uwa.edu.au
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MeSH Terms
Descriptor/Qualifier:
Action Potentials / physiology
Adult
Brain / physiology*
Electromyography
Evoked Potentials, Motor / physiology*
Exercise / physiology
Female
Humans
Isometric Contraction / physiology*
Magnetics
Male
Muscle Fatigue / physiology*
Muscle, Skeletal / innervation,  physiology*
Physical Exertion / physiology*
Rest
Time Factors
Torque

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


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