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Yes, this is because there is no gravity for your heart t fight againts while it is pumping blood to the head. This is likely similar to when you stand upside down and the blood rushes to your head. And so as less force is required the muslce starts to deteriorate, of course it is still nesessary and increased peripheral resistance will mean it still required quite alot of force so it might not be a drastic as youd think, probably about as much as an athlete taking a few weeks off and jsut chilling. Interestingly reinsertion into the normal environment (earth) causes autonomic changes that can challenge the adaptions of peripheral resistance and may lead to an ailment called presyncope.

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16y ago

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