Document Detail


Fatigue in repeated-sprint exercise is related to muscle power factors and reduced neuromuscular activity.
MedLine Citation:
PMID:  18368419     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was (1) to determine the relationship between each individual's anaerobic power reserve (APR) [i.e., the difference between the maximum anaerobic (Pana) and aerobic power (Paer)] and fatigability during repeated-sprint exercise and (2) to examine the acute effects of repeated sprints on neuromuscular activity, as evidenced by changes in the surface electromyogram (EMG) signals. Eight healthy males carried out tests to determine Pana (defined as the highest power output attained during a 6-s cycling sprint), Paer (defined as the highest power output achieved during a progressive, discontinuous cycling test to failure) and a repeated cycling sprint test (10 x 6-s max sprints with 30 s rest). Peak power output (PPO) and mean power output (MPO) were calculated for each maximal 6-s cycling bout. Root mean square (RMS) was utilized to quantify EMG activity from the vastus lateralis (VL) muscle of the right leg. Over the ten sprints, PPO and MPO decreased by 24.6 and 28.3% from the maximal value (i.e., sprint 1), respectively. Fatigue index during repeated sprints was significantly correlated with APR (R = 0.87; P < 0.05). RMS values decreased over the ten sprints by 14.6% (+/-6.3%). There was a strong linear relationship (R2 = 0.97; P < 0.05) between the changes in MPO and EMG RMS from the vastus lateralis muscle during the ten sprints. The individual advantage in fatigue-resistance when performing a repeated sprint task was related with a lower anaerobic power reserve. Additionally, a suboptimal net motor unit activity might also impair the ability to repeatedly generate maximum power outputs.
Authors:
Alberto Mendez-Villanueva; Peter Hamer; David Bishop
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of applied physiology     Volume:  103     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-08-21     Completed Date:  2008-09-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  411-9     Citation Subset:  IM    
Affiliation:
School of Human Movement and Exercise Science, The University of Western Australia, Perth, Australia. jose.villanueva@aspire.qa
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MeSH Terms
Descriptor/Qualifier:
Adult
Anaerobic Threshold / physiology*
Electromyography
Exercise / physiology*
Exercise Test
Exercise Tolerance / physiology
Humans
Male
Muscle Contraction / physiology
Muscle Fatigue / physiology*
Quadriceps Muscle / innervation*,  physiology*

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


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