Abstract
Objective: The fundamental aim of the study was to test whether calcium has some influence on vascular reactivity (VR) during pregnancy.
Methods: In three groups of pregnant Wistar rats, VR was studied in isolated organs (aorta), using noradrenaline as a pressor agent. The first group of rats was placed on a normal diet; the second, on a low-calcium diet; and the third, on a high-calcium diet. The concentration of noradrenaline required to produce a determined contractile response in the vessel was measured (effective concentration = EC50) with VR being deduced from that: the stronger the EC, the weaker the VR and vice versa.
Results: In rats on a low-calcium diet the EC50 was significantly higher than in those on a normal diet and a high-calcium diet.
Conclusions: In rats on a low-calcium diet VR increased significantly from the second week of gestation, compared to rats on normal or high-calcium diet.
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