Document Detail


The effects of varying time under tension and volume load on acute neuromuscular responses.
MedLine Citation:
PMID:  16969639     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to examine the effects of different methods of measuring training volume, controlled in different ways, on selected variables that reflect acute neuromuscular responses. Eighteen resistance-trained males performed three fatiguing protocols of dynamic constant external resistance exercise, involving elbow flexors, that manipulated either time-under-tension (TUT) or volume load (VL), defined as the product of training load and repetitions. Protocol A provided a standard for TUT and VL. Protocol B involved the same VL as Protocol A but only 40% concentric TUT; Protocol C was equated to Protocol A for TUT but only involved 50% VL. Fatigue was assessed by changes in maximum voluntary isometric contraction (MVIC), interpolated doublet (ID), muscle twitch characteristics (peak twitch, time to peak twitch, 0.5 relaxation time, and mean rates of force development and twitch relaxation). All protocols produced significant changes (P <or= 0.05) in the measures considered to reflect neuromuscular fatigue, with the exception of ID. Fatigue was related to an increase in either TUT or VL with greater fatigue, as reflected by MVIC and peripheral measures, being associated with differences in TUT. The lack of change in ID suggests that fatigue was more related to peripheral than central mechanisms. It was concluded that the load and contraction velocities of the repetitions have different effects on acute neuromuscular responses and should, therefore, be clearly calculated when describing training volume for dynamic constant external resistance exercise training.
Authors:
Quan T Tran; David Docherty; David Behm
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Publication Detail:
Type:  Clinical Trial; Journal Article     Date:  2006-09-13
Journal Detail:
Title:  European journal of applied physiology     Volume:  98     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-10-03     Completed Date:  2007-01-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  402-10     Citation Subset:  IM    
Affiliation:
University of Queensland, Brisbane, QLD, Australia.
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MeSH Terms
Descriptor/Qualifier:
Adult
Arm / physiology
Elbow / physiology
Electric Stimulation
Exercise / physiology*
Humans
Isometric Contraction / physiology
Male
Muscle Contraction / physiology
Muscle Fatigue / physiology
Muscle, Skeletal / anatomy & histology,  innervation,  physiology*
Physical Fitness / physiology*
Weight Lifting / physiology*

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


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