The effects of varying time under tension and volume load on acute neuromuscular responses

Tran, Quan T., Docherty,David and Behm, David (2006) The effects of varying time under tension and volume load on acute neuromuscular responses. European Journal of Applied Physiology, 98 4: 402-410. doi:10.1007/s00421-006-0297-3


Author Tran, Quan T.
Docherty,David
Behm, David
Title The effects of varying time under tension and volume load on acute neuromuscular responses
Journal name European Journal of Applied Physiology   Check publisher's open access policy
ISSN 1439-6319
Publication date 2006
Sub-type Article (original research)
DOI 10.1007/s00421-006-0297-3
Volume 98
Issue 4
Start page 402
End page 410
Total pages 9
Place of publication Berlin / Heidelberg
Publisher Springer
Collection year 2006
Language eng
Subject C1
Abstract 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 <= 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.
Keyword contractile properties
contraction velocity
central
peripheral
fatigue
Evoked Contractile Properties
Low-frequency Fatigue
Elbow Flexor Muscles
Multiple Sets
Strength
Voluntary
Single
Speed
Force
Recovery
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Wed, 15 Aug 2007, 09:20:34 EST