Related Experiment Video
Updated: Jan 2, 2026

Design and Analysis of Temperature Preference Behavior and its Circadian Rhythm in Drosophila
Published on: January 13, 2014
Infradian and Ultradian Rhythms of Body Temperature Resumption during Hibernation
M E Diatroptov1, M V Rutovskaya2, E V Kuznetsova2
1Research Institute of Human Morphology, Moscow, Russia. diatrom@inbox.ru.
Abstract:
The rhythms of short-term arousal episodes, associated with normalization of low body temperature, were studied in hibernating Erinaceus roumanicus. The episodes of body temperature recovery during hibernation were 1.7 times more incident during the acrophase of 4.058-day rhythm of glucocorticoid hormones, detected previously, than during the batiphase of this rhythm. Ultradian rhythm of arousal episodes conformed to a 4-h biorhythm: the maximum number of body temperature resumption episodes was recorded at 00.00-01.00, 04.00-05.00, 08.00-09.00, 12.00-13.00, 16.00-17.00, and 20.00-21.00. These data indicated that in mammals the mechanisms of infradian and ultradian rhythm maintenance were stable and did not depend on body temperature or were determined by external factors with periods of 4.058 days and 4 h.
Related Concept Videos
Thermoregulation
Circadian Rhythms and Gene Regulation
Biological Clocks and Seasonal Responses
Sleep-Wake Cycles
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Body Temperature
Body Temperature
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C...

