So instead, the ARED machine utilizes two canisters that create small vacuums that astronauts can pull against with a long bar. This allows them to do squats, bench presses, dead lifts, and more. Astronauts have to be strapped into it with a harness and bungee chords, otherwise they would float away and never actually get a workout. Instead, astronauts grip handles and sit up against a back pad to stay stationary. People also experience something call fluid shift in space.
Without gravity pulling your bodily fluids downward, they shift up into the chest and head, causing issues with the circulatory system and even changes to vision.
In microgravity , however, bones and muscles no longer have to support the weight of astronauts' bodies. What's more, the cardiovascular system becomes lazy because the heart doesn't have to work as hard as it does on Earth to counteract gravity and pump blood up to the head. That means that without exercise, the astronauts' bones would be more fragile and their muscles weaker after time spent in space. If astronauts didn't exercise while they were in space, their bodies would experience major loss in:.
In other words, astronauts need to stay in shape in order to:. Exercising looks a bit different in microgravity. Which begs the question: exactly how do astronauts exercise in outer space? Exercise may not be something you think astronauts make a priority, what with all the exploration and research they have to do every day.
But working out in outer space is just as important as it is on Earth, maybe even more so. According to Digital Trends, the average space visitor loses somewhere in the range of 11 to 17 percent of their strength, 10 percent of their endurance, and up to seven percent of their bone density. To try and offset these effects, NASA requires its astronauts to exercise for two and a half hours a day.
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