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Nutritional status assessment before, during, and after long-duration head-down bed rest.
Sara R Zwart1, Susan A Mathews Oliver, J Vernell Fesperman
1Nutritional Biochemistry Laboratory, Human Adaptation and Countermeasures Division, NASA Johnson Space Center, Houston, TX 77058, USA.
Aviation, Space, and Environmental Medicine
|May 30, 2009
Summary
Bed rest studies reveal physiological changes similar to spaceflight, including increased bone resorption and oxidative damage, alongside altered iron status. These findings confirm bed rest
Area of Science:
- Physiology
- Spaceflight Research
- Nutritional Science
Background:
- Head-down bed rest serves as a crucial ground-based analog for simulating physiological changes experienced during spaceflight.
- Understanding nutritional and metabolic shifts during prolonged bed rest is vital for astronaut health and mission success.
Purpose of the Study:
- To evaluate nutritional and metabolic alterations in individuals undergoing 60 or 90 days of head-down bed rest.
- To compare physiological changes induced by bed rest with known spaceflight effects.
Main Methods:
- 13 participants (8 male, 5 female; ages 26-54) underwent either 60 or 90 days of head-down bed rest.
- Blood and urine samples were collected pre-bed rest and monthly during the study.
- Repeated-measures analysis of variance was used to analyze stored and batch-analyzed samples.
Main Results:
- Significant increases in bone resorption markers (N-telopeptide excretion, P < 0.001) and oxidative damage (superoxide dismutase, P < 0.05) were observed.
- Decreased parathyroid hormone (P < 0.001) and total antioxidant capacity (after 90 days, P < 0.05) were noted.
- Iron status indicated increased iron stores and decreased transferrin receptors (P < 0.01) during bed rest.
Conclusions:
- The physiological changes observed during bed rest mirror those documented during spaceflight.
- This study reinforces the validity of head-down bed rest as a model for spaceflight-induced physiological adaptations.
- Findings highlight the need for further investigation into nutritional countermeasures for space travel.
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