Abstract
Plasma glucagon concentration increased in 2 weeks cold-acclimated rats, but it returned to normal value in 4 weeks cold-acclimated ones. Plasma free fatty acid (FFA) and β-hydroxybutyrate concentrations also showed the similar pattern of changes. Plasma glucagon and FFA concentrations decreased in both 2 weeks and 4 weeks heat-acclimated animals. Plasma β-hydroxybutyrate concentration was not changed by heat acclimation. Plasma glucose concentration decreased in heat-acclimated animals, while it was not affected by cold acclimation. There was a significant positive correlation between plasma glucagon and FFA levels as a whole in 2 weeks warm-, cold- and heat-acclimated rats, and in 4 weeks warm- and heat-acclimated ones. These findings would appear to indicate that in both cold and heat acclimation glucagon is closely involved as one member of a hormonal team through regulating lipid and carbohydrate metabolism.
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