Space can be an unfriendly place for the human body, with microgravity conditions and other factors tampering with our physiology, from head to toe - head, of course, being a primary concern.
This colorless and watery fluid flows in and around the brain and spinal cord. It cushions the brain to help protect against sudden impact and removes waste products.
"If the ventricles don't have sufficient time to recover between back-to-back missions, this may impact the brain's ability to cope with fluid shifts in microgravity.
The study involved 23 male and seven female astronauts - average age around 47 - from the U.S., Canadian and European space agencies. Eight traveled on space shuttle missions of about two weeks. Eighteen were on ISS missions of about six months and four on ISS missions of about a year. "This suggests that the majority of ventricle enlargement happens during the first six months in space, then begins to taper off around the one-year mark," McGregor said.
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