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Altered Venous Function during Long-Duration Spaceflights.

Jacques-Olivier Fortrat1, Ana de Holanda1, Kathryn Zuj2

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Long-duration spaceflight alters venous hemodynamics, decreasing calf volume and impairing venous emptying. These changes in venous function may contribute to cardiovascular deconditioning and orthostatic intolerance after space missions.

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Area of Science:

  • Cardiovascular Physiology
  • Space Medicine
  • Human Physiology

Background:

  • Spaceflight induces microgravity, leading to cardiovascular deconditioning.
  • Orthostatic intolerance is a common issue for astronauts post-flight.
  • Venous adaptation plays a role in cardiovascular health during and after spaceflight.

Purpose of the Study:

  • To analyze key venous hemodynamic parameters during long-duration spaceflight.
  • To understand venous adaptation to microgravity.
  • To investigate the link between venous function and orthostatic intolerance.

Main Methods:

  • Venous plethysmography was conducted on 24 cosmonauts.
  • Measurements were taken before, during, and after International Space Station missions.
  • Calf volume, venous compliance, venous emptying rate, and microvascular filtration were assessed.

Main Results:

  • Calf volume significantly decreased during spaceflight.
  • Venous compliance increased, while venous emptying rate decreased.
  • Vascular microfiltration showed a significant increase during spaceflight.

Conclusions:

  • Spaceflight significantly alters overall venous function.
  • Changes in venous hemodynamics are evident during microgravity exposure.
  • Venous function alterations are critical considerations for developing countermeasures against cardiovascular deconditioning and orthostatic intolerance.