| Pre-acclimatization to high altitude using exercise with normobaric hypoxic gas mixtures. | |
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MedLine Citation:
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PMID: 1483779 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Pre-acclimatization was conducted using a new method elaborated in our laboratory, combining high intensity exercise while breathing hypoxia normobaric gas mixtures. The training consisted in a daily training during three weeks, 6 days a week, two hours a day, on bicycle ergometer. Eighteen subjects aging 22.2 +/- 1.4 years (11 males, 7 females) were matched in two similar groups: one group trained in normoxic conditions (NG) while the other group (HG) trained with a progressive decrease of the fraction of inspired oxygen (from 12.2% to 10.0%). Maximal oxygen uptake (VO2max) were measured before and after the protocol period in both hypoxic (VO2max H, FIO2 = 10.4%) and normoxic (VO2max N) conditions, for the 2 groups. Training induced a similar O2max N increase in the two groups. The ratio VO2max H/VO2max N was calculated. As expected, in NG group, this ratio decreased significantly (from 63.9 +/- 4.3 to 57.5 +/- 3.1%, p < 0.01) after the training period compared to the initial value, diminution associated with an elevation of VO2max N (from 48.4 +/- 9.0 to 52.9 +/- 9.0 ml.min-1 x kg-1, p < 0.01). Conversely, in HG group, this ratio was not significantly diminished (from 61.7 +/- 3.8 to 60.5 +/- 5.2%, NS) in spite of a similar increase of VO2max N (from 47.5 +/- 5.5 to 50.7 +/- 4.9 ml.min-1 x kg-1, p < 0.01). This does not follow the diminution of the ratio usually described when VO2max N reach higher values.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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H Benoit; M Germain; J C Barthélémy; C Denis; J Castells; D Dormois; J R Lacour; A Geyssant |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: International journal of sports medicine Volume: 13 Suppl 1 ISSN: 0172-4622 ISO Abbreviation: Int J Sports Med Publication Date: 1992 Oct |
Date Detail:
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Created Date: 1993-02-18 Completed Date: 1993-02-18 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 8008349 Medline TA: Int J Sports Med Country: GERMANY |
Other Details:
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Languages: eng Pagination: S213-6 Citation Subset: IM; S |
Affiliation:
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Laboratoire de Physiologie-GIP Exercise, Faculté de Médecine, Université Jean Monnet, Saint-Etienne, France. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acclimatization
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physiology* Adaptation, Physiological / physiology Adult Altitude* Anoxia / physiopathology Exercise / physiology* Female Humans Male Nitrogen / administration & dosage* Oxygen / administration & dosage* Oxygen Consumption / physiology Physical Education and Training / methods* Respiration / physiology |
| Chemical | |
Reg. No./Substance:
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37291-87-5/nitrox; 7727-37-9/Nitrogen; 7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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