| Oxygen consumption at altitude as a risk factor for altitude decompression sickness. | |
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MedLine Citation:
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PMID: 21043293 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: The existence of a general influence of exercise on the incidence of decompression sickness (DCS) has been known for more than a half-century. However, quantification of the effect has not been done for several reasons, including isolation of exercise as the only variable. The DCS database at Brooks City-Base, TX, contains detailed physiologic information on over 3000 altitude exposures. The purpose of this study was to measure Vo2 during the activities performed during those exposures to retrospectively determine if Vo2, a quantifiable index of exercise intensity, was related to the level of reported DCS. METHODS: Ground-level activity was designed to duplicate the standardized activity during the altitude exposures. Breath-by-breath Vo2 was determined for each activity using a COSMED metabolic measurement system. Comparison of the Vo2 during four levels of activity performed under otherwise comparable conditions allowed a determination of correlation between Vo2 and DCS risk observed during the altitude exposures. RESULTS AND DISCUSSION: Four previous altitude exposure profiles at 8992 m to 9144 m (29,500 to 30,000 ft; 231 to 226 mmHg) for 4 h following a 1-h prebreathe resulted in 38-86% DCS. This study provided the Vo2 of activities during those studies. The correlation between DCS incidence and the highest 1-min Vo2 of activity was 0.89. CONCLUSION: The highest 1-min Vo2 showed a high correlation with level of DCS risk. Future exposures involving lower levels of activity could provide data that would allow improvement in modeling of DCS risk. |
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Authors:
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James T Webb; Larry P Krock; Michael L Gernhardt |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Aviation, space, and environmental medicine Volume: 81 ISSN: 0095-6562 ISO Abbreviation: Aviat Space Environ Med Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-11-03 Completed Date: 2010-11-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7501714 Medline TA: Aviat Space Environ Med Country: United States |
Other Details:
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Languages: eng Pagination: 987-92 Citation Subset: IM; S |
Affiliation:
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NASA Johnson Space Center, Houston, TX, USA. jtwebb@swbell.net |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aerospace Medicine Altitude Sickness / prevention & control Decompression Sickness / etiology*, physiopathology* Exercise / physiology* Humans Male Oxygen Consumption / physiology* Oxygen Inhalation Therapy / adverse effects* Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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