Body Temperature and Oxygen Consumption of Newborn Rats at Various Ambient Temperatures

Autor:	Nariko Takano, Motohiko Mohri, Tetsuo Nagasaka
Rok vydání:	1979
Předmět:	Male Physiology Chemistry chemistry.chemical_element Rectal temperature Environmental Exposure General Medicine Oxygen Rats Cold Temperature Oxygen Consumption Animal science Animals Newborn Anesthesia Animals Homeothermy Weaning Female O2 consumption Closed circuit Body Temperature Regulation
Zdroj:	The Japanese Journal of Physiology. 29:173-180
ISSN:	1881-1396 0021-521X
DOI:	10.2170/jjphysiol.29.173
Popis:	The thermogenic response and rectal temperature (Tre) of newborn rats (0 to 32 days old) on exposure to various ambient temperatures (Ta) were investigated. The O2 consumption (VO2 in ml . min-1 per 100 cm2 surface area) was measured for one rat at a time by means of a closed circuit system. The results were that (1) within the thermal neutral ranges, Tre stood at 36--37 degrees C regardless of the age and the value of VO2 was lowest at the age of 6--7 days, after this period increasing and reaching a level of 1.4 ml . min-1 . cm-2 X 10(-2) after 18--21 days old (the weaning period); (2) the thermogenic response to cold (delta VO2/--delta Ta) was higher at ages prior to the weaning period than after the weaning period; (3) in spite of the higher thermogenic responses, Tre decreased markedly on exposure to cold prior to the weaning period, because of a poor development of thermal insulation; and (4) the achievement of homeothermy of the rat at subneutral temperatures was observed after the weaning period.
Databáze:	OpenAIRE
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