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Upright Cardiac Output Measurements in the Transition to Weightlessness during Parabolic Flights

Limper, Ulrich and Gauger, Peter and Beck, Luis E J (2011) Upright Cardiac Output Measurements in the Transition to Weightlessness during Parabolic Flights. Aviation, Space and Environmental Medicine, 82 (4), pp. 448-454.

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Abstract

OBJECTIVE: Aims of this study were 1) to determine cardiac output by inert gas rebreathing (COreb) during transition into 0 Gz in the standing position 2) to compare impedance cardiography (ICG) and pulse contour method (PCM) with COreb as a reference method. METHODS: We measured baseline COreb and heart rate (HR) on ground, and COreb, COpcm, COicg and HR in standing and supine positions in the transition to weightlessness in 6 subjects. We conducted repeated measures ANOVA, Bland and Altman analysis and analysis of percentage error of each data set. RESULTS: COreb rose from 5.03 ±0.7 upright ground control to 11.45 ±3.6 L.min-1 in 0 Gz. HR and stroke volume (SV) rose from 83 ±14 to 113 ±19 beats per min and from 61 ±6 to 99 ±18 mL, respectively. Mean COreb, COpcm and COicg across all conditions were 10.45 ±3.04, 7.42 ±1.71, and 6.57 ±2.46 L/min, respectively. Overall Bland and Altman analysis showed poor agreement for COpcm and COicg compared to COreb. DISCUSSION: Large bias for both comparisons indicated that both PCM and ICG underestimate the true CO value. Paired CO values of individual subjects showed a better correlation between methods and a broad bias range, indicating a preponderant role for large between-subjects variability. Repeated COreb determinations in 1 Gz (i.e., when the cardiovascular system is in a steady state) should be used for calibration of the PCM and of ICG data. PCM and ICG can then be used to track CO dynamics during rapid changes of acceleration profiles.

Document Type:Article
Title:Upright Cardiac Output Measurements in the Transition to Weightlessness during Parabolic Flights
Authors:
AuthorsInstitution or Email of Authors
Limper, UlrichUlrich.Limper@dlr.de
Gauger, PeterPeter.Gauger@dlr.de
Beck, Luis E JLuis.Beck@dlr.de
Date:April 2011
Journal or Publication Title:Aviation, Space and Environmental Medicine
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:82
Page Range:pp. 448-454
Status:Published
Keywords:Herzzeitvolumenbestimmung in aufrechter Körperlage während Parabelflug
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Integrative Studien (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Space Physiology
Deposited By: Luis Beck
Deposited On:27 Jun 2011 09:23
Last Modified:04 Apr 2013 16:28

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