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Am J Physiol Regul Integr Comp Physiol 277: R198-R208, 1999;
0363-6119/99 $5.00
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Vol. 277, Issue 1, R198-R208, July 1999

Early phase insulin infusion and muscarinic blockade in obese and lean subjects

Karen L. Teff and Raymond R. Townsend

Monell Chemical Senses Center and the Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania 19104

The effect of early phase insulin on postprandial levels of insulin, C-peptide, glucose, and glucagon was investigated in lean (n = 10) and obese (n = 12) subjects. Subjects underwent four conditions during ingestion of a meal (600 kcal): 1) saline infusion; 2) 10-min insulin infusion simultaneously with meal ingestion (0.24 U bolus, 15 mU · m-2 · min-1); 3) atropine infusion (0.4 mg/m2 bolus, 0.4 mg · m-2 · h for 4 h); 4) insulin and atropine infusion. Blood samples were taken for 3.5 h. Insulin infusion had no effect on postprandial insulin levels in either population but significantly reduced postprandial glucose in the obese subjects (P < 0.05). Obese subjects with elevated postprandial glucose levels in the presence of muscarinic blockade exhibited a decline in glucose with insulin supplementation. Atropine reduced postprandial insulin levels in both groups, with a greater attenuation in the obese (P < 0.01), but postprandial glucose levels were also significantly reduced, suggesting that atropine inhibited gastric emptying. Thus the effects of muscarinic blockade on postprandial insulin levels cannot be evaluated. These data suggest that insulin supplementation during the preabsorptive time period may contribute to glucoregulation in the obese population.

parasympathetic nervous system; obesity; cephalic phase; vagus; insulin; glucose; glucagon


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