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Carotid baroreceptor influence on forearm vascular resistance during low level lower body negative pressureThe degree of forearm vasoconstriction induced by low levels of lower body negative pressure (LBNP) provides a measure of the responsiveness of the cardiopulmonary baroreflex. The validity of this measurement is based on the assumption that this vasoconstriction response is not influenced by unloading of carotid baroreceptors. To test the hypothesis that arterial baroreceptor unloading does not alter the degree of forearm vascular resistance during low levels of LBNP, 12 subjects were exposed to -15 and -20 mm Hg LBNP with and without additional artificial (+ 10 mm Hg neck pressure) unloading of the carotid baroreceptors. There was no measurable influence of carotid unloading on forearm vascular resistance at either level of LBNP. It is concluded that forearm vascular resistance measured during cardiopulmonary baroreceptor unloading is unaffected by carotid baroreceptor unloading within the magnitude encountered during low levels of LBNP.
Document ID
19910069263
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Thompson, Cynthia A.
(NASA Kennedy Space Center; Bionetics Corp. Cocoa Beach, FL, United States)
Ludwig, David A.
(North Carolina, University Greensboro, United States)
Convertino, Victor A.
(NASA Kennedy Space Center Cocoa Beach, FL, United States)
Date Acquired
August 14, 2013
Publication Date
October 1, 1991
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Volume: 62
ISSN: 0095-6562
Subject Category
Aerospace Medicine
Accession Number
91A53886
Funding Number(s)
CONTRACT_GRANT: NAS10-10285
Distribution Limits
Public
Copyright
Other

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