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Has any research been conducted or is anything known about how much time must be spent in 1G per 24 hours in order to preserve good health?

Assume that this refers to an extended space-journey. The artificial gravity could be provided by a module that is entered and used for exercise.

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    $\begingroup$ Relevant perhaps: medium.com/@chrisbbehrens/… $\endgroup$ – Chris B. Behrens Feb 5 '19 at 18:53
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    $\begingroup$ Nobody knows. There are studies simulating weightlessness by having people lie in bed. $\endgroup$ – user20636 Feb 5 '19 at 21:25
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    $\begingroup$ Probably none, since astronauts have spent over a year in space in free fall. $\endgroup$ – Organic Marble Feb 5 '19 at 21:39
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    $\begingroup$ Might be worthwhile to define "good health." There are multiple aspects to be addressed, such as muscle atrophy, balance (inner ear stuff), changes in the ocular lens, etc... $\endgroup$ – ben Feb 6 '19 at 2:08
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    $\begingroup$ I don't think it's currently possible to answer this question, humans in artificial gravity for long periods of time is an area of research that is almost completely unexplored $\endgroup$ – Dragongeek Feb 6 '19 at 13:22

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