Lower body negative pressure identifies altered central vein characteristics without accompanying changes to baroreflexes in astronauts within hours of landing

Cardiovascular deconditioning and altered baroreflexes predispose returning astronauts to Orthostatic Intolerance. We assessed 7 astronauts (1 female) before and following long-duration spaceflight (146 ± 43 days) with minimal upright posture prior to testing. We applied lower body negative pressure...

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Bibliographic Details
Published in:Scientific reports 2024-01, Vol.14 (1), p.1215-1215, Article 1215
Main Authors: Mastrandrea, C. J., Greaves, D. K., Shoemaker, J. K., Blaber, A. P., Arbeille, P., Hughson, R. L.
Format: Article
Language:English
Subjects:
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692/4019
Arteries
Astronauts
Baroreflex - physiology
Blood pressure
Blood Pressure - physiology
Cardiovascular system
Female
Heart rate
Heart Rate - physiology
Humanities and Social Sciences
Humans
Lower Body Negative Pressure
multidisciplinary
Portal vein
Science
Science (multidisciplinary)
Space flight
Statistical analysis
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Summary:Cardiovascular deconditioning and altered baroreflexes predispose returning astronauts to Orthostatic Intolerance. We assessed 7 astronauts (1 female) before and following long-duration spaceflight (146 ± 43 days) with minimal upright posture prior to testing. We applied lower body negative pressure (LBNP) of up to − 30 mmHg to supine astronauts instrumented for continual synchronous measurements of cardiovascular variables, and intermittent imaging the Portal Vein (PV) and Inferior Vena Cava (IVC). During supine rest without LBNP, postflight elevations to total peripheral resistance (TPR; 15.8 ± 4.6 vs. 20.8 ± 7.1 mmHg min/l, p 
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-024-51643-1