Document Detail

Effectiveness of a breath during exercise in a hyperbaric environment.
MedLine Citation:
PMID:  6794207     Owner:  NLM     Status:  MEDLINE    
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.
H D Van Liew; D K Sponholtz
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Undersea biomedical research     Volume:  8     ISSN:  0093-5387     ISO Abbreviation:  Undersea Biomed Res     Publication Date:  1981 Sep 
Date Detail:
Created Date:  1981-12-21     Completed Date:  1981-12-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0421514     Medline TA:  Undersea Biomed Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  147-61     Citation Subset:  IM; S    
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MeSH Terms
Atmospheric Pressure*
Carbon Dioxide / metabolism
Gases / metabolism
Oxygen Consumption
Physical Exertion*
Grant Support
Reg. No./Substance:
0/Gases; 124-38-9/Carbon Dioxide

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