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Related Experiment Videos

Bed rest affects ventricular and arterial elastances in monkeys: implications for humans.

Steven C Koenig1, Dan L Ewert, David A Ludwig

  • 1Jewish Hospital Heart and Lung Institute, Department of Surgery, University of Louisville, Louisville, KY 40202, USA. sckoen01@athena.louisville.edu

Aviation, Space, and Environmental Medicine
|January 23, 2004
PubMed
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Head-down bed rest did not alter cardiac elastances (Ees, Eart). However, elevated systemic arterial elastance (Eart) may be an adaptation to physical inactivity and cardiovascular deconditioning.

Area of Science:

  • Cardiovascular Physiology
  • Exercise Physiology
  • Space Physiology

Background:

  • Cardiovascular deconditioning is a significant concern during spaceflight and prolonged inactivity.
  • Understanding the impact of altered fluid distribution on cardiac mechanics is crucial for mitigating these effects.

Purpose of the Study:

  • To investigate the effects of head-down bed rest (HDBR) on systemic arterial elastance (Eart) and left ventricular end-systolic elastance (Ees).
  • To determine if fluid shifts during HDBR influence cardiac elastances and if changes in Eart and Ees are related.

Main Methods:

  • A crossover study design in five rhesus monkeys exposed to 96 hours of 10-degree head-down bed rest (HDBR) and 96 hours of upright control.
  • Measurements of Eart and Ees were taken during various exposure periods, including acute lower body negative pressure (LBNP) to simulate orthostatic stress.

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Main Results:

  • Head-down bed rest did not affect Ees or Eart at any observation period.
  • Eart increased similarly during 4-day exposures to both control and HDBR conditions.
  • Ees increased with increasing LBNP levels in both control and HDBR, while Eart remained unchanged.

Conclusions:

  • The study found no significant effect of HDBR on cardiac elastances.
  • Elevated Eart might be an adaptive response to physical inactivity, potentially linked to cardiovascular deconditioning.