| Metabolic and neuromuscular adaptations to endurance training in professional cyclists: a longitudinal study. | |
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MedLine Citation:
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PMID: 11016988 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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A Lucía; J Hoyos; J Pardo; J L Chicharro |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Japanese journal of physiology Volume: 50 ISSN: 0021-521X ISO Abbreviation: Jpn. J. Physiol. Publication Date: 2000 Jun |
Date Detail:
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Created Date: 2000-12-08 Completed Date: 2000-12-28 Revised Date: 2007-03-21 |
Medline Journal Info:
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Nlm Unique ID: 2985184R Medline TA: Jpn J Physiol Country: JAPAN |
Other Details:
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Languages: eng Pagination: 381-8 Citation Subset: IM |
Affiliation:
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Departamento de Ciencias Morfológicas y Fisiología, Universidad Europea de Madrid, Spain. alejandro.lucia@mrfs.cisa.uem.es |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological
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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:
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0/Bicarbonates; 50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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