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  • Title: [Sleep--wakefulness cycle of cold-blooded vertebrates according to the results of continuous contact-free recording of the heart rate and motor activity].
    Author: Belich AI.
    Journal: Zh Evol Biokhim Fiziol; 1980; 16(4):371-9. PubMed ID: 6968489.
    Abstract:
    Using continuous non-contact registration of the heart rate and motor activity, separate states were revealed in awakefulness--sleep cycle of various poikilotherms (the catfish Ictalurus nebulosus, frog Rana temporaria, tortoise Emys orbicularis). The method employed allowed also to classify motor automatic activity which was observed in earlier experiments at the background of sleep-like forms of the resting state. Two basic types of these automaticities were distinguished. Comparison of the data obtained on poikilothermic animals with those obtained on homoiothermic ones (the ground squirrel Citellus parryi) indicates the validity of using the heart rate and motor activity for detection of the awakefulness-sleep cycle.
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