Document Detail


Cycling exercise and the determination of electromechanical delay.
MedLine Citation:
PMID:  16990013     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The main aim of the present paper was to address the validity of a methodology proposed in a previous paper [Li L, Baum BS. Electromechanical delay estimated by using electromyography during cycling at different pedaling frequencies. J Electromyogr Kinesiol 2004;14(6):647-52], aimed at determining the electromechanical delay from pedaling exercise performed at various cadences. Twelve trained subjects undertook pedaling bouts corresponding to combinations of cadences ranging from 50 to 100 RPM and power output from 37.5% to 75% of Pmax. As cadence increased, peak torque angle was found to shift forward in crank cycle (from 60-65 degrees at 50 RPM to 75-80 degrees at 100 RPM, depending on the power output level), while muscle bursts shifted backward in accordance with previous works. It is therefore suggested to take into account this peak torque angle lag to improve the methodology proposed by Li and Baum. The present results also evidenced that the central strategy, consisting in earlier muscle activation in crank cycle as cadence increases, is only partial. Neural strategy seems to be a trade-off between mechanical efficiency of muscular force output and coactivation.
Authors:
G Sarre; R Lepers
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Publication Detail:
Type:  Journal Article     Date:  2006-09-20
Journal Detail:
Title:  Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology     Volume:  17     ISSN:  1050-6411     ISO Abbreviation:  J Electromyogr Kinesiol     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-08-08     Completed Date:  2007-12-06     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9109125     Medline TA:  J Electromyogr Kinesiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  617-21     Citation Subset:  IM    
Affiliation:
INSERM ERM207, Université de Bourgogne, UFR STAPS, BP 27877, 21078 Dijon Cedex, France.
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MeSH Terms
Descriptor/Qualifier:
Adult
Bicycling / physiology*
Exercise Test
Hip Joint / physiology*
Humans
Knee Joint / physiology*
Male
Muscle Contraction / physiology*
Muscle, Skeletal / physiology*
Physical Exertion / physiology*
Task Performance and Analysis*
Time Factors
Torque

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


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