Why do astronauts get 'space anemia'? This study has an answer.

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The world-first study found that more than 3 million red blood cells were killed a second in space, compared to just 2 million on Earth.

examined the red blood cell counts of 14 astronauts who had been to space, and found that their bodies destroyed 54% more red blood cells in space than they did on Earth — providing an answer to long-held questions about the condition.

Prior to this study, space anemia was believed to be caused by a sudden shift of fluids into an astronaut's upper body when they first entered space, causing the loss of 10% of the liquid in their blood vessels. It was also believed that their bodies would quickly destroy 10% of their red blood cells to balance this shift, and red blood cell count would return to normal after 10 days in space, the release said.

On Earth, human bodies create and kill 2 million red blood cells every second — but in space, they destroy 3 million every second, the researchers said. Both male and female astronauts experienced the same red blood cell destruction, and five of 13 astronauts were clinically anemic upon landing, the researchers said in the release. One astronaut did not have blood drawn upon landing.

 

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