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  • Title: Circadian rhythms in Macaca mulatta monkeys during Bion 11 flight.
    Author: Alpatov AM, Hoban-Higgins TM, Klimovitsky VY, Tumurova EG, Fuller CA.
    Journal: J Gravit Physiol; 2000 Jan; 7(1):S119-23. PubMed ID: 11543439.
    Abstract:
    Circadian rhythms of primate brain temperature, head and ankle skin temperature, motor activity, and heart rate were studied during spaceflight and on the ground. In space, the circadian rhythms of all the parameters were synchronized with diurnal Zeitgebers. However, in space the brain temperature rhythm showed a significantly more delayed phase angle, which may be ascribed to an increase of the endogenous circadian period.
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