Document Detail


Metabolic and neuromuscular adaptations to endurance training in professional cyclists: a longitudinal study.
MedLine Citation:
PMID:  11016988     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aim of this longitudinal study was to analyze the changes in several metabolic and neuromuscular variables in response to endurance training during three defined periods of a full sports season (rest, precompetition and competition). The study population was formed by thirteen professional cyclists (age +/- SEM: 24+/-1 years; mean V(O2 max) approximately 74 ml kg(-1) min(-1)). In each testing session, subjects performed a ramp test until exhaustion on a cycle ergometer (workload increases of 25 W min(-1)). The following variables were recorded every 100 W until the tests: oxygen consumption (V(O2) in l min(-1)), respiratory exchange ratio (RER in V(CO2) V(O2)(-1)) and blood lactate, pH and bicarbonate concentration [HCO3(-)]. Surface electromyography (EMG) recordings were also obtained from the vastus lateralis to determine the variables: root mean square voltage (rms-EMG) and mean power frequency (MPF). RER and lactate values both showed a decrease (p<0.05) throughout the season at exercise intensities corresponding to submaximal workloads. In contrast, no significant differences were found in mean pH or [HCO(3-)]. Finally, rms-EMG tended to increase during the season, with significant differences (p<0.05) observed mainly between the competition and rest periods at most workloads. In contrast, precompetition MPF values increased (p<0.05) with respect to resting values at most submaximal workloads but fell (p<0.05) during the competition period. Our findings suggest that endurance conditioning induces the following general adaptations in elite athletes: (1) lower circulating lactate and increased reliance on aerobic metabolism at a given submaximal intensity, and possibly (2) an enhanced recruitment of motor units in active muscles, as suggested by rms-EMG data.
Authors:
A Lucía; J Hoyos; J Pardo; J L Chicharro
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Japanese journal of physiology     Volume:  50     ISSN:  0021-521X     ISO Abbreviation:  Jpn. J. Physiol.     Publication Date:  2000 Jun 
Date Detail:
Created Date:  2000-12-08     Completed Date:  2000-12-28     Revised Date:  2007-03-21    
Medline Journal Info:
Nlm Unique ID:  2985184R     Medline TA:  Jpn J Physiol     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  381-8     Citation Subset:  IM    
Affiliation:
Departamento de Ciencias Morfológicas y Fisiología, Universidad Europea de Madrid, Spain. alejandro.lucia@mrfs.cisa.uem.es
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology*
Adult
Bicarbonates / blood
Bicycling / physiology*
Electromyography
Exercise / physiology
Exercise Test
Humans
Hydrogen-Ion Concentration
Lactic Acid / blood
Longitudinal Studies
Motor Neurons / physiology
Muscle, Skeletal / innervation,  physiology
Oxygen Consumption / physiology
Physical Endurance / physiology*
Pulmonary Gas Exchange / physiology
Chemical
Reg. No./Substance:
0/Bicarbonates; 50-21-5/Lactic Acid

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