Document Detail

Plasma volume and endocrine responses to water immersion with intermittent positive-pressure breathing in men.
MedLine Citation:
PMID:  3297017     Owner:  NLM     Status:  MEDLINE    
The effect of intermittent positive-pressure breathing (PB), induced by expiring against a resistance of 12.5 mm Hg, on plasma volume and endocrine responses to standing water immersion, was studied in seven male subjects, 28-49 years of age. The men were immersed to the neck (35 +/- 0.5 degrees C) for 90 min with PB from 30 to 60 min. Compared to control values, the hematocrit and hemoglobin concentration decreased (p less than 0.001) during immersion while plasma osmolality was unchanged, indicating an isotonic increase in plasma volume (hemodilution) which peaked after 75 min at +15.5% of the preimmersion plasma volume. This hemodilution was not significantly affected by PB. Plasma renin activity and vasopressin and aldosterone concentrations decreased progressively throughout immersion (p less than 0.001) and were unaffected by PB. The magnitude of these hormonal decreases was accentuated by preexisting, presyncopal symptoms in four subjects. It is concluded that intermittent PB as 12.5 mm Hg failed to compensate for the negative-pressure breathing of standing subjects immersed in water to the neck.
M H Harrison; J Silver; L Keil; C E Wade; J E Greenleaf
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  58     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  1987 May 
Date Detail:
Created Date:  1987-07-02     Completed Date:  1987-07-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  424-9     Citation Subset:  IM; S    
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MeSH Terms
Aldosterone / blood
Blood Pressure
Erythrocyte Indices
Immersion / physiopathology*
Intermittent Positive-Pressure Breathing*
Middle Aged
Plasma Volume*
Positive-Pressure Respiration*
Renin / blood
Vasopressins / blood
Reg. No./Substance:
11000-17-2/Vasopressins; 52-39-1/Aldosterone; EC

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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