Document Detail

Heterogeneity of muscle recruitment pattern during pedaling in professional road cyclists: a magnetic resonance imaging and electromyography study.
MedLine Citation:
PMID:  15098128     Owner:  NLM     Status:  MEDLINE    
Although a number of studies have been devoted to the analysis of the activity pattern of the muscles involved in pedaling in sedentary subjects and/or amateur cyclists, data on professional cyclists are scarce and the issue of inter-individual differences has never been addressed in detail. In the present series of experiments, we performed a non-invasive investigation using functional magnetic resonance imaging and surface electromyography to determine the pattern of activity of lower limb muscles during two different exhausting pedaling exercises in eight French professional cyclists. Each subject performed an incremental exercise during which electromyographic activity of eight lower limb muscles and respiratory variables were recorded. After a 3-h recovery period, transverse relaxation times (T2) were measured before and just after a standardized constant-load maximal exercise in order to quantify exercise-related T2 changes. The global EMG activity illustrated by the root mean square clearly showed a large inter-individual difference during the incremental exercise regardless of the investigated muscle (variation coefficient up to 81%). In addition, for most of the muscles investigated, the constant-load exercise induced T2 increases, which varied noticeably among the subjects. This high level of variation in the recruitment of lower limb muscles in professional cyclists during both incremental and constant-load exercises is surprising given the homogeneity related to maximal oxygen consumption and training volume. The high degree of expertise of these professional cyclists was not linked to the production of a common pattern of pedaling and our results provide an additional evidence that the nervous system has multiple ways of accomplishing a given motor task, as has been suggested previously by neural control theorists and experimentalists.
François Hug; David Bendahan; Yann Le Fur; Patrick J Cozzone; Laurent Grélot
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-04-20
Journal Detail:
Title:  European journal of applied physiology     Volume:  92     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2004 Jul 
Date Detail:
Created Date:  2004-07-08     Completed Date:  2005-01-25     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  334-42     Citation Subset:  IM    
Laboratoire des Déterminants Physiologiques de l'Activité Physique, Faculté des Sciences du Sport, Université de la Meditérannée (Aix-Marseille II), 163 avenue de Luminy, Marseille, Cedex 09, France.
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MeSH Terms
Bicycling / physiology*
Electromyography / methods*
Image Interpretation, Computer-Assisted / methods
Lower Extremity / physiology
Magnetic Resonance Imaging / methods*
Muscle Contraction / physiology*
Muscle, Skeletal / innervation,  physiology*
Physical Endurance / physiology*
Physical Exertion / physiology
Physical Fitness / physiology*

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