Abstract
The evolution of adrenaline and noradrenaline in plasma and adrenals of rats during pregnancy, parturition and post parturition was studied. Plasmatic adrenaline demonstrated marked increases on the 18th day of pregnancy and during parturition. At the same time adrenaline stores of adrenal gland declined. Noradrenaline in plasma was significantly lower during 16th to 20th day of pregnancy and during parturition. The noradrenaline storage in adrenal gland followed nearly similar pattern as in the plasma. An accelerated rate of adrenaline release in the blood from adrenal gland during pregnancy is suggested. Noradrenaline variations appear to be the consequence of changed sympathetic nervous activity due to modifications in the endocrine status of the pregnant rats. The results suggest that variations in the concentrations of different hormones induced by the pregnancy produce altered pattern of adrenaline and noradrenaline release and storage.
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