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ß-Cell Capacity and Insulin Sensitivity in Prepubertal Children Born Small for Gestational Age

Influence of Body Size During Childhood

¹ Department of pediatrics, Research institute for Endocrinology, Reproduction and Metabolism Vrÿe Universiteit University Medical Center, Amsterdam, The Netherlands
² Diabetes Center, Department of Endocrinology, Vrÿe Universiteit University Medical Center, Amsterdam, The Netherlands

Insulin secretion and sensitivity was studied in 28 prepubertal children born small for gestational age (SGA) and in 22 prepubertal children born appropriate for gestational age (AGA). The effect of body size during childhood was also assessed. Insulin sensitivity was measured using the hyperinsulinemic-euglycemic clamp (M value), and ß-cell function was studied with the hyperglycemic clamp plus arginine. First-phase insulin response (FIR) was used to calculate the disposition index (FIR x M value). Arginine-stimulated second-phase insulin response was used as a measure of ß-cell capacity. BMI_{0–1 year}, BMI_{0–2 years}, and BMI_{2–9 years} were classified in tertiles. SGA children were less insulin sensitive than AGA children (P = 0.009). ß-Cell capacity and disposition indexes were similar in the two groups. In SGA children, M values were lower in the tertile with the highest BMI_{2–9 years} than in the tertile with the lowest BMI_{2–9 years} (P = 0.01). No association between BMI_{0–2 years} and decreased insulin sensitivity was found. In conclusion, prepubertal SGA children show decreased insulin sensitivity rather than decreased ß-cell capacity. Interventions to improve fetal growth and prevent overweight after the second year of life appear to be important factors in the prevention of type 2 diabetes in children born SGA.

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