| Long-term intermittent hypoxia increases O2-transport capacity but not VO2max. | |
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MedLine Citation:
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PMID: 17824823 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Long-term intermittent hypoxia, characterized by several days or weeks at altitude with periodic stays at sea level, is a frequently occurring pattern of life in mountainous countries demanding a good state of physical performance. The aim of the study was to determine the effects of a typical South American type of long-term intermittent hypoxia on VO2max at altitude and at sea level. We therefore compared an intermittently exposed group of soldiers (IH) who regularly (6 months) performed hypoxic-normoxic cycles of 11 days at 3550 m and 3 days at sea level with a group of soldiers from sea level (SL, control group) at 0 m and in acute hypoxia at 3550 m. VO2max was determined in both groups 1 day after arrival at altitude and at sea level. At altitude, the decrease in VO2max was less pronounced in IH (10.6 +/- 4.2%) than in SL (14.1 +/- 4.7%). However, no significant differences in VO2max were found between the groups either at sea level or at altitude, although arterial oxygen content (Ca(O(2) )) at maximum exercise was elevated (p < 0.001) in IH compared to SL by 11.7% at sea level and by 8.9% at altitude. This higher Ca(O(2) ) mainly resulted from augmented hemoglobin mass (IH: 836 +/- 103 g, SL: 751 +/- 72 g, p < 0.05) and at altitude also from increased arterial O(2)-saturation. In conclusion, acclimatization to long-term intermittent hypoxia substantially increases Ca(O(2) ), but has no beneficial effects on physical performance either at altitude or at sea level. |
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Authors:
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Nicole Prommer; Katja Heinicke; Teresa Viola; Jorge Cajigal; Claus Behn; Walter F J Schmidt |
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Publication Detail:
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Type: Clinical Trial; Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: High altitude medicine & biology Volume: 8 ISSN: 1527-0297 ISO Abbreviation: High Alt. Med. Biol. Publication Date: 2007 |
Date Detail:
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Created Date: 2007-09-10 Completed Date: 2008-02-26 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100901183 Medline TA: High Alt Med Biol Country: United States |
Other Details:
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Languages: eng Pagination: 225-35 Citation Subset: IM; S |
Affiliation:
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Department of Sports Medicine and Sports Physiology, University of Bayreuth, Germany. nicole.prommer@uni-bayreuth.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological Adult Altitude* Altitude Sickness / blood* Analysis of Variance Anoxia / blood* Blood Volume Chile Erythrocyte Count Erythrocyte Volume Erythropoietin / blood Hemoglobins / analysis Humans Male Military Personnel* Oxygen Consumption |
| Chemical | |
Reg. No./Substance:
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0/Hemoglobins; 11096-26-7/Erythropoietin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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