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Computational modeling of cardiovascular response to orthostatic stressThe objective of this study is to develop a model of the cardiovascular system capable of simulating the short-term (< or = 5 min) transient and steady-state hemodynamic responses to head-up tilt and lower body negative pressure. The model consists of a closed-loop lumped-parameter representation of the circulation connected to set-point models of the arterial and cardiopulmonary baroreflexes. Model parameters are largely based on literature values. Model verification was performed by comparing the simulation output under baseline conditions and at different levels of orthostatic stress to sets of population-averaged hemodynamic data reported in the literature. On the basis of experimental evidence, we adjusted some model parameters to simulate experimental data. Orthostatic stress simulations are not statistically different from experimental data (two-sided test of significance with Bonferroni adjustment for multiple comparisons). Transient response characteristics of heart rate to tilt also compare well with reported data. A case study is presented on how the model is intended to be used in the future to investigate the effects of post-spaceflight orthostatic intolerance.
Document ID
20040088471
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Heldt, Thomas
(Harvard University-Massachusetts Institute of Technology Division of Health Sciences and Technology, Massachusetts Institute of Technology Cambridge, Massachusetts 02139, United States)
Shim, Eun B.
Kamm, Roger D.
Mark, Roger G.
Date Acquired
August 21, 2013
Publication Date
March 1, 2002
Publication Information
Publication: Journal of applied physiology (Bethesda, Md. : 1985)
Volume: 92
Issue: 3
ISSN: 8750-7587
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Other
Keywords
Flight Experiment
manned
NASA Discipline Cardiopulmonary
short duration
STS Shuttle Project
Non-NASA Center

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