[Mechanisms of chemical thermoregulation in mature and immature-born animals at an early postnatal age].
The energy contribution of motor activity and gray fat to the total heat production was studied in 3-4-day old mice Acomys cochirinus and Wistar rats at ambient temperatures 37 degrees C, 34 degrees C and 30 degrees C. At lower ambient temperature, the motor activity and the total heat production were found to increase. A significant positive correlation was found among the motor activity, total heat production and temperature of the gray fat tissue. The latter exceeded the rectal temperature by 0.6-1.0 degrees C in all animals in all conditions. The 3-4-day old animals produce more heat per unit of motor activity than the 8-10-day old animals.
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D002001:Adipose Tissue, Brown / Q000502:physiology*; D000818:Animals; D000831:Animals, Newborn / Q000502:physiology*; D001833:Body Temperature Regulation; D002152:Calorimetry, Differential Scanning; D009043:Motor Activity / Q000502:physiology*; D009115:Muridae; D009132:Muscles / Q000502:physiology*; D051381:Rats; D011919:Rats, Inbred Strains; D013045:Species Specificity
Mekhanizmy khimicheskoĭ termoreguliatsii u zrelo- i nezrelorozhdaiushchikhsia zhivotnykh rannego postnatal'nogo vozrasta.