Space adaptation syndrome

Overview

Space Adaptation Syndrome (SAS) is a condition that affects some individuals in space, particularly during the initial stages of spaceflight.

Causes

SAS is caused by the body's struggle to adapt to the microgravity environment, where the usual cues for balance and spatial orientation are disrupted. This leads to a conflict between the sensory inputs from the inner ear, eyes, and proprioceptors (sensors that detect movement and position).

Symptoms

The symptoms of SAS are similar to those experienced with motion sickness, but the cause is different. Common symptoms include:

• Space motion sickness (similar to car sickness)
• Dizziness and disorientation
• Nausea and vomiting
• Headaches
• Fatigue
• Difficulty sleeping
• Decreased appetite

Triggers

SAS can be triggered by various factors, including:

• Microgravity environment
• Visual-vestibular mismatch (conflict between what the eyes and inner ear perceive)
• Changes in body position and movement
• Spacecraft motion and vibrations

Duration

The duration of SAS varies, but it usually subsides within 2-3 days as the body adapts to the new environment.

Countermeasures

Astronauts and cosmonauts often undergo training to help them prepare for and mitigate the effects of SAS. Medication and other countermeasures can also be used to alleviate symptoms.

History

SAS was first identified during the early years of spaceflight, when astronauts experienced symptoms similar to motion sickness. Since then, research has been conducted to understand the causes and effects of SAS, and to develop countermeasures to mitigate its effects.

See also

• Motion sickness
• Microgravity