NTRS - NASA Technical Reports Server

Back to Results
Apollo flight crew cardiovascular evaluationsThe results of the lower body negative pressure (LBNP) and passive stand tests are presented, and the efficacy of the experimental antihypotensive garments is evaluated. Results of the tests are presented in tabular form. Postflight orthostatic evaluations during the Apollo program indicate that reduction in orthostatic tolerance is a consequence of space flight exposure. Heart rate, the most reliable index, was increased, while systolic and pulse pressures were decreased during immediate postflight evaluations using lower body negative pressure and passive standing as the orthostatic stress. Elevation in resting heart rate was a less frequent finding. There was considerable variability in the magnitude of these changes between individual crewmembers and in the persistence of the changes over subsequent postflight evaluations. Postflight changes in leg volume during LBNP were equal to or less than those seen during preflight baseline evaluations. Body weight, resting calf girth, supine leg volume, and cardiothoracic ratios were all diminished immediately postflight, and return to preflight values was not complete within the postflight testing time frame.
Document ID
Acquisition Source
Johnson Space Center
Document Type
Book Chapter
G.W. Hoffler
(Johnson Space Center Houston, Texas, United States)
Robert L. Johnson
(Johnson Space Center Houston, Texas, United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Publication Information
Publication: Biomedical Results of Apollo
Publisher: National Aeronautics and Space Administration
Volume: NASA-SP-368
Issue Publication Date: January 1, 1975
Subject Category
Aerospace Medicine
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
No Preview Available