
Astronauts spending six months or longer in space should stretch their time between trips to three years, warns new research on the impact of space travel on the brain. To study this, researchers examined the brain scans of 30 astronauts, looking at scans that depicted their brains both before and after their missions. The research team included missions that were two weeks long, six months long and a full year. Eight of the astronauts were on the shortest missions, four on the longest and the remaining 18 were gone for six months. “We found that the more time people spent in space, the larger their ventricles became,” said study author Rachael Seidler, a professor of applied physiology and kinesiology at the University of Florida (UF). “Many astronauts travel to space more than one time, and our study shows it takes about three years between flights for the ventricles to fully recover.” The ventricles are cavities in the brain filled with cerebrospinal fluid. This offers protection, nourishment and waste removal for the brain. While fluids typically are distributed throughout the body, without gravity that fluid shifts upward. This pushes the brain higher within the skull and causes the ventricles to expand, the researchers explained. This ventricular expansion is the most enduring change seen in the brain resulting from spaceflight, said Seidler, who is also a member… read on > read on >