| Effectiveness of a breath during exercise in a hyperbaric environment. | |
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MedLine Citation:
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PMID: 6794207 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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During vigorous foot-pedal exercise at 6.75 ATA, three subjects had lower total ventilation, larger functional residual capacity (FRC), and higher PCO2 in end-expired and mixed-expired gas than during the same exercise at 1.5 ATA. Compartmental analysis of multiple breath washin suggested that ventilation was more evenly distributed during the high pressure exercise. Mass-balance analysis of inert indicator gases in single breaths showed that at a given pressure, low-diffusivity gases did not mix in the lung as well as high-diffusivity gases. It did not follow, however, that a particular gas was better mixed at low pressure than when its diffusivity was decreased by high pressure; the data showed just the opposite during exercise. The apparent paradox seems to be explained by the change of other conditions for mixing at high pressure, especially the enlargement of the FRC. |
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Authors:
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H D Van Liew; D K Sponholtz |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Undersea biomedical research Volume: 8 ISSN: 0093-5387 ISO Abbreviation: Undersea Biomed Res Publication Date: 1981 Sep |
Date Detail:
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Created Date: 1981-12-21 Completed Date: 1981-12-21 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0421514 Medline TA: Undersea Biomed Res Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 147-61 Citation Subset: IM; S |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Atmospheric Pressure* Carbon Dioxide / metabolism Gases / metabolism Humans Oxygen Consumption Physical Exertion* Respiration* |
| Grant Support | |
ID/Acronym/Agency:
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P01-HL-14414/HL/NHLBI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Gases; 124-38-9/Carbon Dioxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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