The following changes occur in space:
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Bone Fabric loses calcium
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Corrupted Pressure and blood circulation
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Reduced muscle mass
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Changes metabolism
Rehabilitation starts immediately after the astronauts come to the training center and occurs in two stages: Acute and Sanatorium lasts 20-40 days, each depending on their health status. In the first days, in the meantime, dizziness and balance problems may occur.
The acute period includes:
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In dose Physical activity: swimming, gymnastics, physiotherapy exercises
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Massage
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Sanatorium Period takes place in private or rehabilitation centers. At this stage:
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Increase Intensity of education
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Loads Approach to the level up to flight
During rehabilitation, astronauts continue to perform professional tasks: they participate in scientific experiments, analyze the flight and communicate with the media. After the recovery is completed, he enters a medical examination at the astronaut training center, takes a holiday and returns to work on the world. The main medical commission is required to allow the next flight.
Source: Ferra

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