Document Detail

Neuromuscular function during prolonged pedalling exercise at different cadences.
MedLine Citation:
PMID:  16266373     Owner:  NLM     Status:  MEDLINE    
AIM: The purpose of the present work was to assess the strategies set by the central nervous system in order to provide the power output required throughout a prolonged (1-h) pedalling exercise performed at different cadences (50 rpm, 110 rpm and the freely chosen cadence). METHODS: Neuromuscular (NM) activity of vastus lateralis, rectus femoris, biceps femoris and gastrocnemius lateralis muscles was studied quantitatively [root-mean square (RMS) and mean power frequency (MPF)] and qualitatively (timing of onset and offset of muscle bursts during crank cycle). RESULTS: The present results showed that increased cadence resulted in earlier muscle activation in crank cycle. The influence of cadence on RMS and MPF depended on the considered muscle and its functional role during pedalling. Timing of onset and offset of muscle bursts was not altered by fatigue throughout the prolonged exercise. In contrast, RMS and MPF of some muscles was found to increase during prolonged exercise. CONCLUSION: In summary, the present study revealed that tonic aspects of the NM activity (RMS, MPF) are altered during prolonged pedalling exercise, while phasic aspects are remained unchanged. These results suggest that the strategies set by the central nervous system in order to provide the power output required by the exercise are held constant throughout the exercise, but that quantitative aspects of the central drive are increased in order to adapt to the progressive occurrence of the NM fatigue.
G Sarre; R Lepers
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  185     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-11-03     Completed Date:  2006-04-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  England    
Other Details:
Languages:  eng     Pagination:  321-8     Citation Subset:  IM    
INSERM ERM207, UFR STAPS, Université de Bourgogne, Dijon Cedex, France.
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MeSH Terms
Adaptation, Physiological
Analysis of Variance
Central Nervous System / physiology*
Muscle Fatigue / physiology
Muscle, Skeletal / physiology*
Oxygen Consumption
Physical Endurance / physiology*
Time Factors

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