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Cardiovascular responses of men and women to lower body negative pressureChanges in blood flow and blood redistribution were measured by impedance plethysmography in the pelvic and leg regions of six male and four female subjects during three 5-min exposures to -20, -40, and -60 mm Hg lower body negative pressure (LBNP). Female subjects demonstrated significantly higher mean heart rate and lower leg blood flow indices than the male subjects during the recumbent control periods. Men had slightly higher mean resting systolic and diastolic blood pressures and higher mean control pelvic blood indices. Women demonstrated significantly less blood pooling in the legs and slightly less in the pelvic region than the men. All of the 18 tests with male subjects at -60 mm Hg were completed without initial signs of syncope, while only two of the tests with women were completed successfully without the subject exhibiting presyncopal conditions. Results indicate that impedance plethysmography can be used to measure segmental cardiovascular responses during LBNP and that females may be less tolerant to -60 mm Hg LBNP than males.
Document ID
19770041655
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Montgomery, L. D.
(NASA Ames Research Center Moffett Field, CA, United States)
Kirk, P. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Payne, P. A.
(NASA Ames Research Center Moffett Field, CA, United States)
Gerber, R. L.
(NASA Ames Research Center Moffett Field, CA, United States)
Newton, S. D.
(NASA Ames Research Center Moffett Field, CA, United States)
Williams, B. A.
(NASA Ames Research Center Moffett Field, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
February 1, 1977
Subject Category
Aerospace Medicine
Accession Number
77A24507
Distribution Limits
Public
Copyright
Other

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