Document Detail


Effects of physical training in a hypobaric chamber on the physical performance of competitive triathletes.
MedLine Citation:
PMID:  8803509     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects of training in a hypobaric chamber on aerobic metabolism were studied in five high performance triathletes. During 3 weeks, the subjects modified their usual training schedule (approximately 30 h a week), replacing three sessions of bicycling exercise by three sessions on a cycle ergometer in a hypobaric chamber simulating an altitude of 4,000 m (462 mm Hg). Prior to and after training in the hypobaric chamber the triathletes performed maximal and submaximal exercise in normoxia and hypoxia (462 mm g). Respiratory and cardiac parameters were recorded during exercise. Lactacidaemia was measured during maximal exercise. Blood samples were drawn once a week to monitor blood cell parameters and erythropoetin concentrations. Training in the hypobaric chamber had no effect on erythropoiesis, the concentrations of erythropoetin always remaining unchanged, and no effect on the maximal oxygen uptake (VO2max) and maximal aerobic capacity measured in normoxia or hypoxia. Submaximal performance increased by 34% during a submaximal exhausting exercise performed at a simulated altitude of 2,000 m. During a submaximal nonexhausting test, ventilation values tended to decrease for similar exercise intensities after training in hypoxia. The changes in these parameters and the improved performance found for submaximal exercise may have been the result of changes taking place in muscle tissue or the result of training the respiratory muscles.
Authors:
J M Vallier; P Chateau; C Y Guezennec
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  73     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1996  
Date Detail:
Created Date:  1996-12-05     Completed Date:  1996-12-05     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  471-8     Citation Subset:  IM    
Affiliation:
Institut de Médecine Aérospatiale du Service de Santé des Armées, Centre d'Etudes et de Recherches de Médecine Aérospatiale, Department de Physiologie Systémique, Brétigny-sur-Orge, France.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aerobiosis / physiology
Altitude*
Atmospheric Pressure*
Bicycling
Erythropoiesis / physiology
Female
Hemodynamics / physiology
Humans
Lactic Acid / blood
Male
Physical Fitness / physiology*
Respiratory Mechanics / physiology
Running
Sports*
Swimming
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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