Want to bulk up and build muscle? Don’t go to space

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Without gravity, your muscles don’t really need to work very hard. This may sound nice in theory — but there can be some pretty serious consequences down the line. For instance, astronauts’ muscles can start to weaken due to underuse within days of them leaving Earth.

Researchers at the University of Florida took a closer look at the issue, examining muscle microtissue samples from two groups of people: relatively young, active people and their older counterparts who live more sedentary lifestyles and therefore don’t have as much relative muscle mass. Then, they sent those samples to the International Space Station (ISS).



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