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Related Experiment Videos

Lower leg fluid displacement during a simulated space shuttle launch

D Linnarsson1, B Tedner, B Lindborg

  • 1Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.

European Journal of Applied Physiology and Occupational Physiology
|July 11, 1998
PubMed
Summary

Astronauts lose leg fluid volume before launch. Most fluid reduction in the lower leg occurs during pre-launch and simulated launch conditions, not during the actual g-force exposure.

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Area of Science:

  • Human physiology
  • Space medicine
  • Fluid dynamics

Background:

  • Spaceflight causes significant leg fluid volume reduction.
  • Understanding fluid shifts during pre-flight and launch is crucial for astronaut health.

Purpose of the Study:

  • To test if leg fluid volume changes occur during prelaunch and launch periods.
  • To quantify fluid shifts in the lower leg during simulated space shuttle launch.

Main Methods:

  • Six male subjects were monitored during a simulated Space Shuttle launch.
  • Lower leg fluid volume was measured after 2 hours in a supine, elevated-leg position.
  • Subjects were exposed to increased g-force (anteroposterior) in a human centrifuge for 500 seconds.

Main Results:

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  • A mean fluid loss of 113 ml occurred in the lower leg during the prelaunch period.
  • Minimal additional fluid reduction was observed during the simulated g-force exposure.
  • This prelaunch fluid loss is comparable to reductions seen in early space missions.

Conclusions:

  • A significant portion of lower leg fluid reduction occurs before launch.
  • The prelaunch phase is critical for understanding fluid shifts associated with spaceflight.
  • Further research should focus on pre-flight physiological adaptations.