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This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?

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Last week on the podcast we talked about space health.

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Specifically, we told you about a new paper discussing the role that physicians will have to play in determining which citizens are fit enough for commercial jaunts into space.

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Now let's leap ahead, and much farther afield.

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What kinds of issues might a crew of astronauts face on a longer journey--say, a round-trip to Mars?

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To find out, six volunteers spent a record 520 days confined to a simulated space habitat near Moscow.

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They emerged in 2011.

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Now a report in the Proceedings of the National Academy of Sciences shows that the simulated spaceflight did have real effects.

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Removed from natural light and the rhythms of everyday life, four crewmembers experienced some type of sleep disturbance.

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And one exhibited signs of chronic sleep deprivation in regular alertness tests.

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Overall, the crew also became more sedentary with time.

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The researchers conclude that a real Mars mission would need to incorporate tactics such as timed light exposure or exercise to keep astronauts' circadian rhythms on beat.

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Because it would be a bad idea to land on Mars sleepy and out of shape.

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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.

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