Document Detail


Changes in motor unit characteristics after eccentric elbow flexor exercise.
MedLine Citation:
PMID:  20973828     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Morphological evidence suggests that fast-twitch fibers are prone to disruption of their membrane structures by eccentric exercise. However, it is unclear how this is reflected in the discharge rate and action potential propagation of individual motor units, especially at high contraction levels. High-density surface electromyograms were recorded from biceps brachii muscle and decomposed to individual motor unit action potentials at isometric contraction levels between 10% and 75% of maximal voluntary contraction (MVC) before intermittent maximal elbow flexor eccentric exercise, and two hours (2H), two days (2D) and four days (4D) post-exercise. Maximal voluntary force decreased by 21.3±5.6% 2H and by 12.6±11.1% 2D post-exercise. Motor unit discharge rate increased and mean muscle fiber conduction velocity decreased, at the highest isometric contraction levels only (50% and 75% of MVC) at 2H post-exercise. These results indicate that eccentric exercise can disturb the function of motor units active at high contraction levels in the early stages after exercise, which seems to be compensated by the central nervous system with an increase in neural drive during submaximal isometric contractions.
Authors:
H Piitulainen; A Holobar; J Avela
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Publication Detail:
Type:  Journal Article     Date:  2010-10-25
Journal Detail:
Title:  Scandinavian journal of medicine & science in sports     Volume:  22     ISSN:  1600-0838     ISO Abbreviation:  Scand J Med Sci Sports     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-05-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9111504     Medline TA:  Scand J Med Sci Sports     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  418-29     Citation Subset:  IM    
Copyright Information:
© 2010 John Wiley & Sons A/S.
Affiliation:
Department of Biology of Physical Activity, Neuromuscular Research Center, University of Jyväskylä, Jyväskylä, FinlandLaboratorio di Ingegneria del Sistema Neuromuscolare (LISiN), Politecnico di Torino, Torino, ItalyFaculty of Electrical Engineering and Computer Science, University of Maribor, Maribor, Slovenia.
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