Document Detail

The effects of varying time under tension and volume load on acute neuromuscular responses.
MedLine Citation:
PMID:  16969639     Owner:  NLM     Status:  MEDLINE    
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.
Quan T Tran; David Docherty; David Behm
Related Documents :
18756009 - Comparison of electrical and magnetic stimulations to assess quadriceps muscle function.
16323389 - Employment status in chronic fatigue syndrome. a cross-sectional study examining the va...
11676719 - The role of the diaphragm during abdominal hollowing exercises.
9302489 - Dynamics of exercise induced affect.
12730519 - Fatigue in systemic lupus erythematosus: a randomized controlled trial of exercise.
19528869 - Strength athletes are capable to produce greater muscle activation and neural fatigue d...
9198259 - Muscle strength, working capacity and effort in patients with fibromyalgia.
11303339 - Behavioral momentum and the law of effect.
2791449 - Synergistic adverse hemodynamic interaction between oral verapamil and propranolol.
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    
University of Queensland, Brisbane, QLD, Australia.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Arm / physiology
Elbow / physiology
Electric Stimulation
Exercise / physiology*
Isometric Contraction / physiology
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

Previous Document:  Rotator cuff tears: assessment with MR arthrography in 275 patients with arthroscopic correlation.
Next Document:  Relationship between ace genotype and short duration aerobic performance development.