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• W2045247513 startingPage "e47984" @default.
• W2045247513 abstract "In spaceflight human circadian rhythms and sleep patterns are likely subject to change, which consequently disturbs human physiology, cognitive abilities and performance efficiency. However, the influence of microgravity on sleep and circadian clock as well as the underlying mechanisms remain largely unknown. Placing volunteers in a prone position, whereby their heads rest at an angle of −6° below horizontal, mimics the microgravity environment in orbital flight. Such positioning is termed head-down bed rest (HDBR). In this work, we analysed the influence of a 45-day HDBR on physiological diurnal rhythms. We examined urinary electrolyte and hormone excretion, and the results show a dramatic elevation of cortisol levels during HDBR and recovery. Increased diuresis, melatonin and testosterone were observed at certain periods during HDBR. In addition, we investigated the changes in urination and defecation frequencies and found that the rhythmicity of urinary frequency during lights-off during and after HDBR was higher than control. The grouped defecation frequency data exhibits rhythmicity before and during HDBR but not after HDBR. Together, these data demonstrate that HDBR can alter a number of physiological processes associated with diurnal rhythms." @default.
• W2045247513 created "2016-06-24" @default.
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• W2045247513 date "2012-10-24" @default.
• W2045247513 modified "2023-10-01" @default.
• W2045247513 title "Changes in the Diurnal Rhythms during a 45-Day Head-Down Bed Rest" @default.
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• W2045247513 doi "https://doi.org/10.1371/journal.pone.0047984" @default.
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