Browsing by Subject "Calcium -- Physiological effect"
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Item A comparative study of calcium utilization in human and porcine spermatozoa(Texas Tech University, 1991-12) Prien, Samuel D.Not availableItem Animal response to administration of potassium salts and to administration of calcium depressing salts(Texas Tech University, 1947-08) Mahaffey, William ClaibornNot availableItem Differential effects of calcium on the metabolism of Duchenne muscular dystrophy fibroblasts in vitro(Texas Tech University, 1987-12) Mone, James PNot availableItem The effect of calcium from dairy products and calcium citrate on blood pressure and selected plasma, serum and urine values in males(Texas Tech University, 1988-12) McKenzie, Maureen AnnForty male hypertensive subjects (mean age=46.7 years) were supplemented with 24 oz 1 1/2-2 per cent fat milk, 800 mg calcium as calcium citrate, or a placebo for 12 weeks. Plasma total calcium, ionized calcium, sodium, potassium, renin activity, magnesium and phosphate, and urinary calcium, sodium, potassium, and phosphate were analyzed. Sitting and supine blood pressures were determined every two weeks. Mean baseline blood pressure values were 140/90 mm Hg. Three 3-day dietary intake records were completed at baseline, 6 and 12 weeks of treatment. Blood pressure values and plasma and urinary values did not differ significantly at the end of treatment for any group. Baseline dietary data showed that 55 per cent were consuming 2.90 per cent, and 65 per cent were consuming 2_65 per cent of the RDA for calcium. The subjects receiving calcium supplementation were grouped by plasma renin activity in which low-renin and normal-renin hypertensives were identified. Baseline blood pressures did not differ significantly between the two rennin subgroups and mean blood pressures were not significantly different after calcium supplementation. Mean urinary sodium excretion was significantly lower (p<0.05) in low-renin hypertensive subjects before treatment and increased to become nonsignficantly different from the normal-renin hypertensives after calcium supplementation. Plasma total calcium and urinary calcium increased in low-renin hypertensives after treatment and became significantly greater than the normal-renin hypertensives (p<0.001, p<0.0001, respectively). In conclusion, approximately 800 mg Ca from dairy products or Ca citrate did not cause a significant change in the blood pressure of male hypertensive subjects after 12 weeks of supplementation.