Spaceflight and long-distance swimming compress the heart

What do extreme long-distance swimming and spaceflight have in common? It can shrink both hearts, according to a new study.

Reduces the pressure of both activities Gravity On the heart, it makes it so that the body does not have to work as hard to pump blood upwards. The heart is a muscle, and like other muscles in the body, if not used as much as before, it will contract.