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[Preventive effects of exercise training on bone loss during 21 d -6 degrees head down bed-rest]
Yu-sheng Liu1, Wei-fen Huang, Li-ping Li
1Institute of Space Medico-Engineering, Beijing, China.
Summary
Exercise during head down bed rest (HDBR) significantly prevents bone loss. This study shows that HDBR exercise mitigates decreases in femur bone mineral density (BMD) and bone turnover markers.
Area of Science:
- Bone physiology
- Spaceflight and microgravity research
- Exercise physiology
Context:
- Head-down bed rest (HDBR) simulates microgravity effects on the human body.
- Bone loss is a significant concern during prolonged bed rest and space missions.
- Understanding countermeasures for HDBR-induced bone loss is crucial for astronaut health.
Purpose:
- To investigate the efficacy of exercise training as a countermeasure against bone loss induced by 21 days of -6 degrees head down bed rest (HDBR).
- To assess the impact of supine cycling exercise on femur bone mineral density (BMD) and bone turnover markers during HDBR.
Summary:
- Ten healthy men underwent 21 days of -6 degrees HDBR, with five participating in daily supine cycling exercise.
- Femur BMD decreased by 5.8% in the HDBR-only group but only 0.9% in the HDBR with exercise group.
- Bone turnover marker hydroxyproline/creatinine (HOP/Cr) increased significantly in the HDBR group compared to the exercise group.
Impact:
- Exercise training during HDBR effectively preserves bone mineral density.
- Exercise can mitigate detrimental changes in bone metabolism associated with simulated microgravity.
- Findings support the inclusion of exercise protocols for mitigating bone loss in spaceflight and prolonged bed rest scenarios.