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Exercise cardiac output following Skylab missions - The second manned Skylab missionCardiac output was measured during preflight and postflight exercise-stress tests on the Skylab astronauts. In the postflight tests immediately following the 28-, 59-, and 84-d earth orbital missions, the astronauts exhibited an approximate 30% decrease in cardiac output coupled with an approximate 50% decrease in cardiac stroke volume during exercise. These changes were accompanied by elevated heart rates and significant increases in total systemic peripheral vascular resistance. Mean arterial pressure was unchanged. All parameters returned to normal preflight values within 30 d of the end of the orbital period. Duration of the zero-G exposure did not appear to influence either the magnitude of the hemodynamic changes or the time-course of their return to normal. These results are discussed in relation to other cardiovascular findings and possible mechanisms responsible for the observations are outlined.
Document ID
19760045939
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Buderer, M. C.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Mauldin, D. G.
(Technology, Inc. Houston, Tex., United States)
Rummel, J. A.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Michel, E. L.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Sawin, C. F.
(NASA Johnson Space Center Biomedical Research Div., Houston, Tex., United States)
Date Acquired
August 8, 2013
Publication Date
April 1, 1976
Subject Category
Aerospace Medicine
Accession Number
76A28905
Distribution Limits
Public
Copyright
Other

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