NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Ventilation-perfusion relationships in the lung during head-out water immersionMechanisms of altered pulmonary gas exchange during water immersion were studied in 12 normal males: 6 young (aged 20-29) and 6 older (aged 40-45). It is concluded that, in young subjects with closing volume (CV) less than expiratory reserve volume (ERV), gas exchange was enhanced during immersion, because normal ventilation-perfusion relations were preserved, and by mass balance, the ventilation/O2 uptake changes elevated arterial P(O2). In older males with CV greater than ERV and 52 percent of tidal volume below CV, immersion-induced airways closure during tidal breathing was associated with minimally increased shunt that did not significantly impair gas exchange. It is suggested that airways closure of this degree is of little importance to gas exchange.
Document ID
19920040220
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Derion, Toniann
(NASA Headquarters Washington, DC United States)
Guy, Harold J. B.
(NASA Headquarters Washington, DC United States)
Tsukimoto, Koichi
(NASA Headquarters Washington, DC United States)
Schaffartzik, Walter
(NASA Headquarters Washington, DC United States)
Prediletto, Renato
(NASA Headquarters Washington, DC United States)
Poole, David C.
(NASA Headquarters Washington, DC United States)
Knight, Douglas R.
(NASA Headquarters Washington, DC United States)
Wagner, Peter D.
(California, University La Jolla, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Journal of Applied Physiology
Volume: 72
ISSN: 0161-7567
Subject Category
Aerospace Medicine
Accession Number
92A22844
Funding Number(s)
CONTRACT_GRANT: NIH-HL-17731
CONTRACT_GRANT: NAGW-897
CONTRACT_GRANT: NIH-HL-07212
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available