title: [The bio-rhythmic problems of a space flight].
abstract: The influence of space-flight factors on the organism's circadian periodicity is discussed. It is shown that in mechanisms of such influence, the transformation of natural structure of Zeitgebers accompanying a space flight, can play the essential role. It is confirmed by the results of ground research carried out in conditions of isolation simulating the usual space flight transformation of Zeitgebers system. The data obtained in the ground researches with isolation, testify that the changes of circadian rhythms in these conditions are similar to those in space flights and frequently are interpreted as the result of influence of weightlessness. Special attention is paid to phenomenon of delay of the daily maximum and to possible connection of this phenomenon with the tendency to transition of rhythmic process in a free-running regime.
authors.affiliation: Institute of Medical-Biological Problems, Russian Acad. Sci., Russia, 123007, Moscow, 76a Khoroshevskoe Shosse.
authors.forename: S I
authors.initials: SI
authors.lastname: Stepanova
authors.forename: V A
authors.initials: VA
authors.lastname: Galichiĭ
mesh_terms: D000293:Adolescent; D000328:Adult; D001831:Body Temperature / Q000502:physiology; D002940:Circadian Rhythm / Q000502:physiology*; D018504:Ecological Systems, Closed; D005260:Female; D006801:Humans; D008297:Male; D013026:Space Flight; D018561:Space Simulation; D014882:Water-Electrolyte Balance / Q000502:physiology
vernacular_title: Bioritmologicheskie problemy kosmicheskogo poleta.