Agnirva Space Premier League - Expedition #31228: Space Sickness Unplugged: Studying Vestibular Changes After Long ISS Missions

Why do astronauts often feel dizzy or disoriented after returning from space? The answer lies in the vestibular system—a part of your inner ear that helps control balance and spatial orientation. In microgravity, this system goes haywire.

The 'Evaluation of Vestibular Dysfunction Induced by a Long-term Stay in the ISS' experiment, led by Dr. Hironobu Morita from Gifu University and supported by JAXA, investigates these changes. Spanning multiple ISS expeditions, the research involved monitoring astronauts before, during, and after their time aboard the space station.

Scientists used head movements, balance tests, and motion sensors to assess how microgravity affects inner ear function. In space, the fluid in the inner ear floats differently, sending confusing signals to the brain. This mismatch causes symptoms like dizziness, nausea, and trouble focusing—the space equivalent of motion sickness.

After astronauts return to Earth, their vestibular systems need time to readjust to gravity. The research helps doctors understand the timeline of recovery and potential long-term effects. The results inform training protocols, rehabilitation programs, and the design of spacecraft interiors to better support human health.

Understanding vestibular dysfunction is crucial for future long-duration missions to the Moon or Mars. If astronauts are to remain effective after landing on another planet, they’ll need ways to prevent or quickly recover from balance disorders.

This study not only improves astronaut safety but also offers insights into similar balance issues on Earth, such as those caused by aging or medical conditions. It’s another example of how space research has down-to-Earth benefits.

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