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Occurrence of fatigue induced by a whole body vibration session is not frequency dependent.
MedLine Citation:
PMID:  23249822     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
ABSTRACT: The aim of this study was to determine whether neuromuscular adaptations (magnitude and location) induced by isometric exercise performed on an oscillating platform are dependent on whole body vibration (WBV) frequency. Eleven young men performed four separate fatigue sessions of static squatting exercise at three frequencies of WBV (V20, V40, and V60) and one session without vibration (V0). Isometric torque and electromyographic (EMG) activity of the vastus lateralis, rectus femoris, and biceps femoris were recorded during maximal voluntary and evoked contractions of the knee extensor muscles before and after each fatigue session in order to examine both peripheral and central adaptations. Isometric torque decreased significantly following each of the four frequency sessions (V0: -9.4 ± 6.1%, p=0.003, V20: -8.1 ± 9.9%, p=0.010, V40: -11.9 ± 12.7 %, p=0.011 and V60: -7.8 ± 9.2%, p=0.001, respectively) but this reduction was not significantly different between frequencies. The torque produced by evoked contraction significantly decreased from pre-exercise values after each session (V0: -14.9±15.6%, p=0.012, V20: -15.8±16.4%, p=0.010, V40: -21.0±14.3%, p=0.004 and V60: -17.3±11.6%, p=0.005, respectively), however there was no effect of vibration frequency. In both conditions, the MVC torque reduction observed was mainly attributable to peripheral fatigue and was not due central modifications of the neuromuscular system. The present study demonstrates that the frequency of vibration does not significantly influence the magnitude and location of neuromuscular fatigue suggesting that adding WBV to static squat exercise (on a vertically oscillating platform) does not provide an additional training stimulus.
Authors:
Zory Raphael; Aulbrook Wesley; Keir Daniel; Serresse Olivier
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-17
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1School of Human Kinetics, Laurentian University, Sudbury, Canada 2Groupement de Recherche Clinique et Technologique sur le Handicap (EA 449), CIC-IT 805, Université Versailles Saint-Quentin en Yvelines, France.
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