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January 31, 2004Journal of Applied Physiology

Effects of simulated microgravity on closed-loop cardiovascular regulation and orthostatic intolerance: analysis by means of system identification

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Why the study?

Does simulated microgravity (16 days of head-down-tilt bed rest) alter autonomic nervous control and increase the risk of orthostatic intolerance in human subjects?

Population

29 human subjects

Comparison

16 days of head-down-tilt bed rest vs Baseline measures before bed rest

Design

Cohort

Follow-up

16 days

Authors

XXXinshu XiaoRMRamakrishna MukkamalaNSNatalie Sheynberg

Discussion

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Overview

Baseline autonomic profiling may stratify post-bed rest orthostatic intolerance risk; leaves open whether targeted interventions alter outcomes in microgravity analogs.

Structured PICO

Does simulated microgravity (16 days of head-down-tilt bed rest) alter autonomic nervous control and increase the risk of orthostatic intolerance in human subjects?

P
Population
29 human subjects
I
Intervention
16 days of head-down-tilt bed rest (simulated microgravity)
C
Comparator
Baseline measures before bed rest
O
Outcome
Parasympathetic and sympathetic regulation of heart rate (HR) and orthostatic intolerance (OI)surrogate

Simulated microgravity via 16 days of bed rest impairs autonomic responsiveness, and baseline autonomic profiles can predict the risk of orthostatic intolerance.

Cite This Study

Xiao et al. (2004) studied this question.

synapsesocial.com/papers/6a1bd1ec0a1f7575939cfe31https://doi.org/10.1152/japplphysiol.00602.2003
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Role of individual predisposition in orthostatic intolerance before and after simulated microgravity2004 · 19 citations
  2. 2Sleep restriction does not affect orthostatic tolerance in the simulated microgravity environment2004 · 1 citations
  3. 3Contributory factors to orthostatic intolerance after simulated weightlessness1999 · 32 citations
  4. 4Microgravity-induced changes in aortic stiffness and their role in orthostatic intolerance2006 · 58 citations
  5. 5Heart rate variability adaptation due to head-down tilt bed rest: insights from pooled data of six campaigns2025 · 3 citations