A COMPARISON OF LIMB PLETHYSMOGRAPH SYSTEMS PROPOSED FOR USE ON THE SPACE-SHUTTLE

  • 1 January 1983
    • journal article
    • research article
    • Vol. 54  (1) , 6-10
Abstract
Comparisons of a Whitney mercury-filled double-stranded strain gauge with 2 plethysmographs proposed for Shuttle use (an ultrasound and an impedance plethysmograph) were performed on 20 [human] subjects. An occlusive thich 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/impendance comparison. Applying the ratio of the maximum volume changes to the gain of each test system caused the impendance and ultrasound volume change determinations to be essentially identical to the Whitney gauge. The 3 different limb parameters measured result in significant magnitude differences but the 3 systems track their respective changes identically.

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