| Abstract: | The amount of insulin required to maintain similar blood glucose concentrations during an eight hour infusion of either saline or growth hormone (2 micrograms/kg/hr) was determined in five fed, insulin-dependent diabetic subjects during closed-loop insulin delivery. Elevations of serum growth hormone concentrations to levels previously observed in poorly controlled diabetic subjects were not accompanied by differences in the amount of insulin required to maintain blood glucose concentrations at levels comparable to those observed during the saline infusion. Specifically, no early insulin-like nor late anti-insulin effects of physiologic increases in serum growth hormone concentrations (10.27 +/- 0.23 mg/ml vs 5.69 +/- 1.5 mg/ml, P less than 0.05) on mean hourly blood glucose levels or mean hourly insulin requirements were observed. These studies suggest that serum growth hormone concentrations similar to those observed in poorly controlled diabetics do not affect the insulin requirements of well-insulinized diabetic subjects. |
