Document Detail


Influence of two pedalling rate conditions on mechanical output and physiological responses during all-out intermittent exercise.
MedLine Citation:
PMID:  12665979     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to investigate the effect of two cycling velocities on power output and concomitant metabolic and cardiorespiratory responses to repeated all-out exercises. Mean power output (P(m)), total work ( W(tot)), total oxygen consumption (VO(2tot)) and blood lactate accumulation (delta[La](b)) were evaluated in 13 male subjects who performed two series of twelve 5-s bouts of sprint cycling. Recovery periods of 45-s were allowed between trials. One series was executed at optimal velocity (V(opt): velocity for greatest power) and the other one at 50% V(opt) (0.5 V(opt)). Velocities obtained in these conditions were V(opt=)116.6 (4.7) rpm; 0.5V(opt)=60.6 (4.9) rpm. After a phase of adaptation in oxygen uptake in the first part of the series, the data from the 6th to the 12th sprint were as follows: P(m), 924.6 (73.9) versus 689.2 (61.8) W; W(tot), 29.95 (4.14) versus 22.04 (3.17) kJ; VO(2tot), 12.80 (1.36) versus 10.58 (1.37) l; delta[La](b), 2.72 (1.22) versus 0.64 (0.79) mmol x l(-1), respectively (P<0.001). Both W(tot) and VO(2tot) were consistently higher at optimal velocity (+21 and +35.8%, respectively). The present findings demonstrate that during intermittent short-term all-out exercise requiring maximal activation, the energy turnover is not necessarily maximal. It depends on muscle contraction velocity. The increase, lower than expected, in metabolic response from 0.5 V(opt) to V(opt) suggests also that mechanical efficiency is higher at V(opt).
Authors:
Sylvain Dorel; Muriel Bourdin; Emmanuel Van Praagh; Jean-René Lacour; Christophe André Hautier
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial     Date:  2003-01-31
Journal Detail:
Title:  European journal of applied physiology     Volume:  89     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2003 Apr 
Date Detail:
Created Date:  2003-03-31     Completed Date:  2003-07-29     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:  157-65     Citation Subset:  IM    
Affiliation:
Laboratoire de Physiologie de l'Exercice GIP Exercise-Sport-Santé, Faculté de Médecine Lyon Sud, BP 12, 69921, Oullins Cedex, France. Sylvain.Dorel@univ-lyon1.fr
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MeSH Terms
Descriptor/Qualifier:
Adult
Bicycling / physiology*
Electromyography
Energy Metabolism
Humans
Lactic Acid / blood
Male
Muscle, Skeletal / physiology*
Osmolar Concentration
Oxygen Consumption
Physical Endurance*
Physical Exertion
Self Concept
Time Factors
Torque
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid

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


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