Document Detail


Intermittent exercise as a conditioning activity to induce postactivation potentiation.
MedLine Citation:
PMID:  17685706     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Postactivation potentiation (PAP) is defined as a short-term increase in voluntary muscle activation following a previous conditioning activity (CA). Controversy about PAP is mostly attributed to the characteristics of the CA and the training status of the subjects. While some studies have found that PAP can be induced by series of 5-10 second maximal voluntary isometric contractions or near maximal dynamic contractions (e.g., 3-5 repetition maximum), others have failed to do so. On the other hand, some studies suggest that intermittent contractions can also induce PAP. However, even though PAP was observed, its duration was not taken into account, leaving ground for further investigations. The purpose of this study was threefold: (a) to verify if PAP can progressively enhance performance of voluntary actions throughout a set of intermittent contractions; (b) to verify PAP duration when induced by an intermittent contractions protocol; and (c) to verify if PAP effects were reproducible in different sessions when induced by intermittent contractions. Ten physically active men, not engaged in strength training, underwent 5 randomized experimental sessions, during which they performed a set of 10 unilateral knee extensions (KE) (1 every 30 seconds) at 60 degrees x s(-1) in an isokinetic dynamometer. Peak torque was evaluated over the 10 unilateral KE and at the randomized intervals of 4, 6, 8, 10, and 12 minutes post CA. Peak torque was potentiated 1.3 (+/-0.79) N x m per unilateral KE, and the potentiation effect persisted for 12 minutes after the last contraction. These findings were reproduced in all 5 experimental sessions. Thus, intermittent conditioning activities seem to be an effective way to produce PAP. However, these activities should be tested in a more real world situation to verify the applicability as a warm-up routine.
Authors:
Mauro A B Batista; Carlos Ugrinowitsch; Hamilton Roschel; Renato Lotufo; Mark D Ricard; Valmor A A Tricoli
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  21     ISSN:  1064-8011     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-08-09     Completed Date:  2007-11-08     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  837-40     Citation Subset:  IM; S    
Affiliation:
Department of Sport, School of Physical Education and Sport, University of São Paulo, São Paulo, SP, Brazil.
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology
Adult
Analysis of Variance
Biomechanics
Humans
Knee Joint / physiology*
Leg / physiology
Long-Term Potentiation / physiology*
Male
Muscle, Skeletal / physiology*
Physical Education and Training / methods*
Physical Exertion / physiology
Reproducibility of Results
Torque

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


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