PMID: 514084Dec 1, 1979Paper

Increased dietary calcium lowers blood pressure in the spontaneously hypertensive rat

Metabolism: Clinical and Experimental
S Ayachi


The effect of increased dietary calcium on the development of hypertension in spontaneously hypertensive (SH) rats was investigated by feeding lab chow fortified with calcium carbonate (2.5% calcium, hCa) beginning at 4 wk of age. A control SH group was fed regular lab chow (1.2% calcium, rCa). Two groups of age-matched Wistar-Kyoto (WKY) rats were treated in parallel. Systolic blood pressure (BP) was measured weekly until the age of 18 wk using a tail cuff method. The hCa diet significantly attenuated the time course of hypertension in SH rats even though both SH groups eventually developed hypertension. The hCa also lowered BP in WKYs, but to a lesser extent. Urine output (24-hr volumes) was not affected by hCa, but in both SH and WKY groups fed the hCa diet, the excretion of Na+, K+ and Ca++ was markedly elevated at 11, 15, and 19 wk of age. Urine osmolality was also elevated. Plasma Na+, Ca++ and osmolality were not significantly altered by the diet in either SH or WKY rats; plasma potassium was significantly lower in the SH group fed the hCa diet than in the group given rCa. The hCa diet did not significantly affect the body or heart, kidney, adrenal, or thymus weights. The results suggest that hCa diet may attenuate genet...Continue Reading


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