Document Detail

Quadriceps EMG frequency content following isometric lumbar extension exercise.
MedLine Citation:
PMID:  20042349     Owner:  NLM     Status:  MEDLINE    
SCOPE: 50 subjects performed fatiguing lumbar extension exercise indexed by downward shifts in median frequency calculated from lumbar paraspinal sEMG signal. Before and after each exercise set we recorded maximal, isometric knee extension torque and quadriceps central activation ratio (QI) using the superimposed burst technique while recording vastus lateralis sEMG. We calculated total frequency content of the sEMG signal (fEMG(TOTAL)) as the area of the quadriceps sEMG frequency spectrum. Quadriceps fEMG(TOTAL) decreased from baseline following the first and second exercise sets. There was no significant change in quadriceps sEMG median frequency among baseline and post-exercise measures. The change in fEMG(TOTAL) was correlated with the change in QI following the first (r=-0.41, P=0.003) and second (r=-0.32, P=0.02) exercise sets.
CONCLUSION: Quadriceps fEMG(TOTAL) decreased following fatiguing lumbar extension exercise, in the absence of a significant change in quadriceps median frequency.
Joseph M Hart; Christopher D Ingersoll
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Publication Detail:
Type:  Journal Article     Date:  2009-12-29
Journal Detail:
Title:  Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology     Volume:  20     ISSN:  1873-5711     ISO Abbreviation:  J Electromyogr Kinesiol     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-08-02     Completed Date:  2011-01-04     Revised Date:  2014-07-30    
Medline Journal Info:
Nlm Unique ID:  9109125     Medline TA:  J Electromyogr Kinesiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  840-4     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2009 Elsevier Ltd. All rights reserved.
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MeSH Terms
Electromyography / methods*
Isometric Contraction / physiology*
Knee Joint / physiology*
Lumbar Vertebrae / physiology*
Muscle, Skeletal / physiology*
Physical Endurance / physiology*
Physical Exertion / physiology*
Young Adult

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

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