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Effects of Individualized Centrifugation Training on Orthostatic Tolerance in Men and Women

Resource type
Date created
2015
Authors/Contributors
Abstract
AimsExposure to artificial gravity (AG) at different G loads and durations on human centrifuges has been shown to improve orthostatic tolerance in men. However, the effects on women and of an individual-specific AG training protocol on tolerance are not known.MethodsWe examined the effects of 90 minutes of AG vs. 90 minutes of supine rest on the orthostatic tolerance limit (OTL), using head up tilt and lower body negative pressure until presyncope of 7 men and 5 women. Subjects were placed in the centrifuge nacelle while instrumented and after one-hour they underwent either: 1) AG exposure (90 minutes) in supine position [protocol 1, artificial gravity exposure], or 2) lay supine on the centrifuge for 90 minutes in supine position without AG exposure [protocol 2, control]. The AG training protocol was individualized, by first determining each subject’s maximum tolerable G load, and then exposing them to 45 minutes of ramp training at sub-presyncopal levels.ResultsBoth sexes had improved OTL (14 minutes vs 11 minutes, p < 0.0019) following AG exposure. When cardiovascular (CV) variables at presyncope in the control test were compared with the CV variables at the same tilt-test time (isotime) during post-centrifuge, higher blood pressure, stroke volume and cardiac output and similar heart rates and peripheral resistance were found post-centrifuge.ConclusionsThese data suggest a better-maintained central circulating blood volume post-centrifugation across gender and provide an integrated insight into mechanisms of blood pressure regulation and the possible implementation of in-flight AG countermeasure profiles during spaceflights.
Document
Published as
Goswami N, Evans J, Schneider S, von der Wiesche M, Mulder E, Rössler A, et al. (2015) Effects of Individualized Centrifugation Training on Orthostatic Tolerance in Men and Women. PLoS ONE 10(5): e0125780. doi:10.1371/journal.pone.0125780
Publication title
PLoS ONE
Document title
Effects of Individualized Centrifugation Training on Orthostatic Tolerance in Men and Women
Date
2015
Volume
10
Issue
5
Publisher DOI
10.1371/journal.pone.0125780
Copyright statement
Copyright is held by the author(s).
Scholarly level
Peer reviewed?
Yes
Language
English
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journal.pone_.0125780.pdf 847.94 KB

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