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Evaluation of the electromechanical properties of the cardiovascular system after prolonged weightlessnessDevices and techniques for measuring and analyzing systolic time intervals and quantitative phonocardiograms were initiated during Apollo 17. The data show that the systolic time interval from Apollo 17 crewmen remained elevated longer postflight than the response criteria of heart rate, blood pressure, and percent change in leg volume all of which had returned to preflight levels by the second day postflight. Although the systolic time interval values were only slightly outside the preflight fiducial limits, this finding suggested that: the analysis of systolic time intervals may help to identify the mechanisms of postflight orthostatic intolerance by virtue of measuring ventricular function more directly and, the noninvasive technique may prove useful in determining the extent and duration of cardiovascular instability after long duration space flight. The systolic time intervals obtained on the Apollo 17 crewmen during lower body negative pressure were similar to those noted in patients with significant heart disease.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Bergman, S. A., Jr.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Johnson, R. L.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Hoffler, G. W.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1977
Publication Information
Publication: Biomed. Results from Skylab
Subject Category
Aerospace Medicine
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
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