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Space adaptation syndrome (SAS) is a condition experienced by astronauts during the adaptation to microgravity. It is characterized by symptoms similar to motion sickness on Earth such as nausea, vomiting, anorexia, fatigue, and malaise. The syndrome is self-limiting and typically resolves within 72 hours.

Causes

The exact cause of SAS is not known. However, it is believed to be due to a conflict between the visual and vestibular systems. In the microgravity environment of space, the vestibular system does not provide the same signals as it does on Earth, leading to a sensory mismatch that results in symptoms of SAS.

Symptoms

The symptoms of SAS are similar to those of motion sickness on Earth. They include:

• Nausea
• Vomiting
• Anorexia
• Fatigue
• Malaise

Treatment

There is no specific treatment for SAS. Symptoms are typically managed with anti-nausea medications and rest. The syndrome is self-limiting and usually resolves within 72 hours.

Prevention

Prevention strategies for SAS include pre-flight training in a rotating chair to desensitize the vestibular system, and the use of anti-nausea medications prior to launch.

See also

• Motion sickness
• Microgravity
• Vestibular system

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