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Venoconstrictive thigh cuffs impede fluid shifts during simulated microgravity
K N Lindgren1, D Kraft, R E Ballard
1Space Physiology Laboratory, NASA Ames Research Center, Moffett Field, CA, USA.
Aviation, Space, and Environmental Medicine
|November 18, 1998
Summary
Venoconstrictive thigh cuffs, when inflated to 50 mmHg during simulated microgravity, effectively redistribute body fluid. This intervention shows promise for managing space adaptation syndrome symptoms and enhancing fluid countermeasures.
Area of Science:
- Physiology
- Aerospace Medicine
- Biomedical Engineering
Background:
- Simulated microgravity induces fluid shifts, impacting astronaut health.
- Understanding fluid redistribution is crucial for space travel countermeasures.
Purpose of the Study:
- To assess the efficacy of venoconstrictive thigh cuffs in altering fluid distribution during simulated microgravity.
- To investigate the potential of thigh cuffs as a countermeasure for spaceflight-induced fluid shifts.
Main Methods:
- Ten healthy males underwent a 2-hour tilt protocol, including -12 degrees head-down tilt (HDT) to simulate microgravity.
- Venoconstrictive thigh cuffs inflated to 50 mmHg were applied during HDT.
- Leg volume changes were measured using anthropometric sleeve plethysmography.
Main Results:
- Body fluid redistribution occurred with tilt position changes, decreasing leg volume.
- Thigh cuff inflation during HDT significantly increased leg volume by 3.0% (p < 0.01).
- No significant changes in systemic cardiovascular parameters were observed during cuff inflation.
Conclusions:
- Venoconstrictive thigh cuffs effectively promote an Earth-like fluid distribution during simulated microgravity.
- Cuffs may help alleviate cephalad edema associated with space adaptation syndrome.
- This intervention could augment current fluid volume countermeasure strategies for spaceflight.
