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The effect of acute insulin infusion on the metabolism of calcium (Ca) and phosphate (P) was examined in 17 healthy subjects. They were hospitalized and kept on a constant diet for 5 days, and an euglycemic hyperinsulinemic glucose clamp was applied. Synthetic human insulin was infused at the rate of 40 mU/m2/min for 2 hr, and glucose was also infused to maintain basal glucose levels of each subject. The control study was performed in 8 of the 17 subjects, into whom 10% xylitol was infused for 2 hr at the rate of 100 ml/hr. The plasma insulin concentrations were 7.94 +/- 0.35 and 62.3 +/- 14.3 mU/liter before and after the glucose clamp technique, but serum free Ca ion was increased significantly (p &lt; 0.05), and serum P and serum parathyroid hormone (PTH) were decreased significantly (p &lt; 0.001). Creatinine clearance did not change during the glucose clamp technique. Urinary excretion of Ca (UCaV) was significantly higher after the glucose clamp than the control study. Fractional excretion of Ca (FECa) was increased significantly (p &lt; 0.05), and urinary excretion of P (UPV) and fractional excretion of P (FEP) were decreased significantly (p &lt; 0.05) under the hyperinsulinemic condition. The results suggested that, under the conditions of euglycemic hyperinsulinemia by glucose clamp technique, insulin increased the serum free Ca ion, and as a result, PTH was suppressed. Decreased PTH might induce calciuresis and enhance tubular P reabsorption under hyperinsulinemia. Insulin increased serum free Ca ion might relate to the vasodilating action of insulin by its decrease of intracellular free Ca ion in vascular smooth muscle.

Effects of Hyperinsulinemia under the Euglycemic Condition on Calcium and Phosphate Metabolism in Non-Obese Normotensive Subjects.