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Abstract
The objective of this study was to determine the effect of a high sodium diet and prepubertal castration (5-6 weeks) and androgen replacement therapy on blood pressure in male normotensive, borderline hypertensive and hypertensive rats on a high sodium diet between 9-22 weeks of age. The strains used were: Wistar Kyoto-(WKY), spontaneously hypertensive rat-(SHR), and borderline hypertensive rat-(BHR). Castration significantly reduced blood pressure (20-30mmHg) and testosterone replacement in castrated males restored blood pressure in all strains. Plasma norepinephrine (NE) increased with castration in the WKY and SHR strains but decreased in the BHR. However, there was a significant elevation in all strains between the midpoint and endpoint NE values. The high sodium diet did not prevent the blood pressure lowering effect of castration.