Twelve volunteers are participating in an experiment where they stay in bed for two months to simulate the effects of space travel on muscles. In microgravity, muscles weaken and shrink due to a lack of exercise and reduced protein production. Scientists are researching ways to counteract muscle loss, including exercise routines and hormone treatments. The study found that exercise improves muscle health and organization, while testosterone injections can further enhance muscle growth. The findings could help develop personalized programs for astronauts and improve muscle treatments for the elderly and patients on Earth.

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