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A comparison of limb plethysmograph systems proposed for use on the Space ShuttleComparisons of a Whitney mercury-filled double-stranded strain gauge with two plethysmographs proposed for Shuttle use - an ultrasound and an impedance plethysmograph - were performed on 20 subjects. An occlusive thigh pressure cuff, inflated to 50 mm Hg, caused partial venous occlusion and subsequent blood pooling distal to the cuff. The average maximum volume changes observed in the Whitney/ultrasound test were 2.07% and 3.35%, respectively, and 2.12% and 2.53% for the Whitney/Impedance comparison. Applying the ratio of the maximum volume changes to the gain of each test system caused the impedance and ultrasound volume change determinations to be essentially identical to the Whitney gauge. The three different limb parameters measured result in significant magnitude differences but the three systems track their respective changes identically.
Document ID
19830036969
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Levitan, B. M.
(NASA Johnson Space Center Physiological Performance Laboratory; Technology, Inc., Houston, TX, United States)
Montgomery, L. D.
(NASA Johnson Space Center Physiological Performance Laboratory, Houston, TX; SRI International, Menlo Park, CA, United States)
Bhagat, P. K.
(NASA Johnson Space Center Physiological Performance Laboratory, Houston, TX; Kentucky, University, Lexington, KY, United States)
Zieglschmid, J. F.
(NASA Johnson Space Center Physiological Performance Laboratory, Houston, TX, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Man/System Technology And Life Support
Accession Number
83A18187
Funding Number(s)
CONTRACT_GRANT: NAS9-14880
Distribution Limits
Public
Copyright
Other

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