Circadian control of body-temperature

Abstract 1. 1.|The circadian rhythm of rectal temperature and the sleep-wake cycle can persist independently of each other and of zeitgebers, and seem to be controlled by separate oscillators. 2. 2.|‘Masking’ of temperature by sleep or zeitgeber signals is to be distinguished from entrainment mechanisms. 3. 3.|Heat production and conductance coact in generating the temperature rhythm. 4. 4.|Circadian variations in system properties, as observed, e.g. in threshold, need to be confirmed in the absence of a sleep-wake (light-dark) cycle.

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