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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.
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.
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:
- 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.