[Human circadian rhythms and the work and rest regimen: the hypothesis of the "coiled spring"].
Studies of human free-running circadian rhythms have been reviewed. The conditions of development of free-run of the circadian rhythms were considered. On the basis of these data a hypothesis of "compressed spring" was proposed. It claims that the human circadian rhythms synchronized within the 24 h day are instable and related to physiologic tension. It follows that in conditions of relative isolation (long-term space flight, submarine navigation, polar expedition), during the transition period after a trans-meridian flight, and during adaptation to a shift (especially, night) work it is advisable to arrange a work-rest schedule on the basis of a prolonged 25 h day.
Alpatov
A M
AM
D000222:Adaptation, Physiological; D002940:Circadian Rhythm / Q000502:physiology*; D006801:Humans; D012146:Rest / Q000502:physiology*; D013997:Time Factors; D014937:Work / Q000502:physiology*
Tsirkadiannye ritmy cheloveka i rezhim truda i otdykha: gipoteza "szhatoĭ pruzhiny".