Researchers monitoring 13 astronauts after six months on the International Space Station found that daily two-hour exercise regimens successfully prevented severe cardiovascular deconditioning. When tested under simulated Martian gravity, the subjects showed no significant signs of strain or orthostatic hypotension. The heart initially struggles during the first two weeks in space, but cardiac filling and stroke volume gradually recover over time.
This is reassuring for long-duration mission planning, though the sample size remains tiny and test conditions on Earth cannot fully replicate the physiological unknown of a nine-month transit. We still lack data on how cumulative radiation might compound these cardiovascular stresses over years in deep space. Exercise helps, but it is not a complete shield against orbital biology.
more: https://www.sciencedaily.com/releases/2026/10/261020085016.htm
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