 "Watch: If you don’t exercise in space? Scott Kelly explains what it does to your heart, bones and brain")
Working out is as important in space as it is on Earth, as zero-gravity takes a toll on the body. Former NASA Astronaut Scott Kelly explained what the human body undergoes in space and how one recovers from it.
Speaking to Firstpost’s Managing Editor Palki Sharma, Kelly, who spent 340 days in space, said, “In the absence of gravity, our cardiovascular systems don’t have to work as hard. On my last mission, I lost 25 per cent of my heart mass. You lose bone mass and muscle mass considerably in space.”
#RisingBharatSummit2025: How does the human body change after a trip to space?@Palkisu asks Former NASA Astronaut @StationCDRKelly, who spent 340 days in space while his identical twin remained on Earth for the @NASA Twins Study. pic.twitter.com/IoPF5cozi4
— Firstpost (@firstpost) April 9, 2025
He added that skipping exercise in space can cost 1 per cent of body mass every month and can eventually lead to complete loss of weight and bone mass to a point where even the skeleton can turn into a “gumby toy”.
“There is a fluid shift to your head that can be very uncomfortable, and it never quite goes away. The pressure from the fluid affects vision too. Zero-gravity also has effects on our genetics,” Kelly added.
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