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Hemodynamic responses to seated and supine lower body negative pressure - Comparison with +Gz accelerationThe hemodynamic responses to LBNP in seated subjects and in subjects in supine body positions were compared and were correlated with hemodynamic changes which occurred during a simulated (by centrifugation) Shuttle reentry acceleration with a slow onset rate of 0.002 G/s and during gradual onset exposures to +3 Gz and +4 Gz. Results demonstrate that seated LBNP at a level of -40 mm Hg can serve as a static simulator for changes in the heart rate and in mean blood pressure induced by gradual onset acceleration stress occurring during Shuttle reentry. The findings also provide a rationale for using LBNP during weightlessness as a means of imposing G-loading on the circulation prior to reentry.
Document ID
19920073837
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Polese, Alvese
(NASA Ames Research Center Moffett Field, CA; Cardiovascular Research Institute, Milan, Italy)
Sandler, Harold
(NASA Ames Research Center Moffett Field, CA, United States)
Montgomery, Leslie D.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Volume: 63
Issue: 6, Ju
ISSN: 0095-6562
Subject Category
Aerospace Medicine
Accession Number
92A56461
Distribution Limits
Public
Copyright
Other

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