Document Detail


Pulmonary capillary blood volume during immersion in water at different temperatures.
MedLine Citation:
PMID:  6675229     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Pulmonary capillary blood volume (Qc) was determined for 7 subjects in the standing posture and immersed up to the sternal manubrium at three water temperatures: 34 degrees C +/- 0.5 degrees C, thermally neutral bath; 25 degrees C +/- 0.5 degrees C, cold bath; and 40 degrees C +/- 0.5 degrees C, hot bath. The Qc was calculated from the lung transfer factor DLco measured while breathing two gas mixtures (21.1% O2 and 90.0% O2) during breath holding. Control experiments in a dry air environment show that Qc values for standing posture decrease compared to the sitting values, owing to a redistribution of the intrathoracic blood volume to lower body parts as a result of gravity. Immersion at 34 degrees C in an upright position produces a significant increase in Qc (P less than 0.01). This is a result of the hydrostatic counterpressure: blood shifts from the periphery to the intrathoracic regions. Immersion at 25 degrees C increases Qc compared to the values obtained at 34 degrees C, but the difference is not significant. The contribution of vasoconstriction to blood volume shift in cold water is probably less important than that of hydrostatic counterpressure. During immersion at 40 degrees C, the rise in Qc is very significant (P less than 0.05). This may be explained by an increase in cardiac output and central blood volume when skin temperature is raised at 40 degrees C.
Authors:
M L Choukroun; H Guenard; P Varene
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Undersea biomedical research     Volume:  10     ISSN:  0093-5387     ISO Abbreviation:  Undersea Biomed Res     Publication Date:  1983 Dec 
Date Detail:
Created Date:  1984-06-14     Completed Date:  1984-06-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0421514     Medline TA:  Undersea Biomed Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  331-42     Citation Subset:  IM; S    
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Volume
Capillaries
Female
Humans
Hydrostatic Pressure
Immersion / physiopathology*
Lung / blood supply*
Male
Middle Aged
Posture
Temperature
Vasoconstriction
Water
Chemical
Reg. No./Substance:
7732-18-5/Water

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


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