Document Detail


Distribution of motor unit potential velocities in the biceps brachii muscle of sprinters and endurance athletes during prolonged dynamic exercises at low force levels.
MedLine Citation:
PMID:  20594871     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In surface electromyography (sEMG), the distribution of motor unit potential (MUP) velocities has been shown to reflect the proportion of faster and slower propagating MUPs. This study investigated whether the distribution of MUP velocities could distinguish between sprinters (n=11) and endurance athletes (n=12) in not-specifically trained muscle (biceps brachii) during prolonged dynamic exercises at low forces. sEMG was acquired during 4min' exercises: unloaded, 5%, 10% and 20% of maximal voluntary contraction (MVC). The features extracted from the sEMG were: the mean muscle conduction velocity - estimated using the inter-peak latency and cross-correlation methods, the within-subject skewness (expressing the proportions of faster and slower propagating MUPs) and the within-subject standard deviation of MUP velocities (SD-mup). Sprinters showed a greater proportion of faster propagating MUPs than endurance athletes. During fatigue, the SD-mup of sprinters broadened progressively, whereas that of endurance athletes did not. The findings suggest that sprinters conveyed a greater proportion of faster motor units than endurance athletes and that motor unit behavior during fatigue differed between groups. Thus, the distribution of MUP velocities enables distinction between a muscle of sprinters and endurance athletes during prolonged dynamic exercises at low forces.
Authors:
Ewa G Klaver-Król; Nizare R Henriquez; Sebe J Oosterloo; Peter Klaver; Harm Kuipers; Machiel J Zwarts
Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2010-07-01
Journal Detail:
Title:  Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology     Volume:  20     ISSN:  1873-5711     ISO Abbreviation:  J Electromyogr Kinesiol     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-09-29     Completed Date:  2011-01-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9109125     Medline TA:  J Electromyogr Kinesiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1115-24     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Ltd. All rights reserved.
Affiliation:
Department of Neurology and Clinical Neurophysiology, Ziekenhuis Groep Twente, Geerdinksweg 141, Hengelo, The Netherlands. eklaver@planet.nl
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Arm
Electromyography*
Humans
Individuality
Male
Muscle Contraction
Muscle Fatigue / physiology
Muscle, Skeletal / physiology
Physical Endurance*
Physical Fitness / physiology
Running*

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


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