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Freerunning sleep in man

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https://www.readbyqxmd.com/read/6472481/seasonality-in-freerunning-circadian-rhythms-in-man
#1
A Wirz-Justice, R A Wever, J Aschoff
Retrospective analysis of data collected over 15 years in normal subjects isolated from time cures showed seasonal rhythms in the circadian period of the core temperature rhythm, in the amount of sleep (both shorter in spring and longer in autumn), and in the incidence of internal desynchronisation (most often in summer). Women slept longer than men at all times of year.
June 1984: Die Naturwissenschaften
https://www.readbyqxmd.com/read/574252/influence-of-physical-workload-on-freerunning-circadian-rhythms-of-man
#2
R A Wever
While living under constant conditions and complete isolation from environmental time cues for about 4 weeks, 9 male subjects exercised on a bicycle ergometer seven times per 'day' during two weeks and refrained from physical activities during the other 2 weeks. The freerunning circadian rhythms of wakefulness and sleep and of rectal temperature showed, on the average, no difference between the two sections with regard to the autonomous period and the tendency towards internal desynchronization. Even in the one experiment in which the two rhythms became internally desynchronized, the periods of the rhythms remained unchanged during the time the subject worked on the bicycle...
August 1979: Pflügers Archiv: European Journal of Physiology
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