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Height increase, neuromuscular function, and back pain during 6 degrees head-down tilt with traction
J R Styf1, R E Ballard, K Fechner
1Gravitational Research Branch, NASA Ames Research Center, Moffett Field, CA 94035-1000, USA.
Aviation, Space, and Environmental Medicine
|January 1, 1997
Summary
Head-down tilt bed rest with traction better simulates microgravity
Area of Science:
- Space medicine
- Human physiology
- Biomedical engineering
Background:
- Astronauts experience spinal lengthening and back pain in microgravity.
- Understanding these physiological changes is crucial for long-duration space missions.
Purpose of the Study:
- To develop a ground-based simulation for spinal adaptation to microgravity.
- To compare head-down tilt bed rest with traction (HDT) to horizontal bed rest (HBR) in simulating these changes.
Main Methods:
- Six subjects underwent 3-day periods of HDT with balanced traction and HBR.
- Measurements included height increase, neuromuscular function, and back pain.
- Spinal length changes were assessed using ultrasonography.
Main Results:
- HDT with traction resulted in significantly greater increases in total body and spinal length and more back pain compared to HBR.
- Both treatments showed similar increases in the L4-S1 spinal segment length.
- No significant changes in erector spinae muscle pressure or ankle torque were observed.
Conclusions:
- Head-down tilt bed rest with balanced traction appears to be a superior method for simulating microgravity-induced spinal lengthening and back pain.
- This simulation method can aid in developing countermeasures for astronaut health.