[Effect of androstenediol on the blood sugar, blood sugar curve of glucose and adrenaline test dose, and on tissue glycogen (hepatic, cardiac, muscular and renal)].
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The measurement of HbA1 gives an "objective" estimate of the degree of metabolic control of diabetes during the erythrocyte lifespan. 333 assays in 85 young diabetics aged three to twenty-three years showed a mean HbA1 of 10.9 +/- 2.6% (controls: 7.4 +/- 1.4%). HbA1 levels parallel the clinical evaluation of the degree of control. HbA1 concentrations are correlated with the duration of diabetes (r = 0.26; p less than 0.001), triglyceridemia (r = 0.22; p less than 0.001), cholesterolemia (r = 0.26; p less than 0.001) and glycemia (r = 0.50; p less than 0.001). The HbA1 glycemia correlation grows stronger as glycemia increases. This probably reflects the existence of a labile form of HbA1. HbA1 concentrations measured repeatedly over one year were not significantly different in diabetics with and without retinopathy, probably because the study period was too short. Measurement of HbA1 is also of value in diagnosing non-compliance.
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In a group of aged nondiabetic and diabetic subjects and in a group of young subjects the glycemic, insulin, growth hormone and glucagon response to intravenous arginine was studied. A prompt increase in blood glucose, serum insulin and glucagon levels was observed, but glucose and glucagon peaks were significantly higher in older non diabetic and diabetic subjects. Growth hormone secretion did not show any difference between aged nondiabetic and young subjects, on the contrary it is lower in diabetics. These findings might suggest the hypothesis of the glucose intolerance during old age due to increased release of glucagon.