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  • Title: Effects of exposure to cold and catecholamines on the respiratory quotient and plasma levels of free fatty acids, glucose and urea in rats acclimated to 15 degrees C.
    Author: Uliasz-Poniewierska M.
    Journal: Acta Physiol Pol; 1982; 33(4):337-44. PubMed ID: 7184317.
    Abstract:
    The reported experiments were carried out on 95 male Wistar rats weighing 300 to 360 g kept for 3 weeks in separate cages in a room at an ambient temperature of 15 degrees C. The rats normally fed or fasted for 24 hours were injected at 24-26 degrees C with adrenaline or noradrenaline (400 micrograms/kg s.c.) or injected at 15 degrees C with propranolol (1 mg/kg s.c.). The metabolic rate (MR), respiratory quotient (RQ) and plasma levels of free fatty acids (FFA), glucose (G) and urea (U) were determined. Similarly as in the non-acclimated rats, the determined parameters considered separately were insufficient for estimating the changes in the catabolism of lipids, carbohydrates and proteins, but a simultaneous determination of the RQ and plasma levels of FFA, G or U with MR measurement indicated the degree of lipid, carbohydrate or protein participation in cold-induced thermogenesis.
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