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Diabetes Care Publish Ahead of Print published online ahead of print April 16, 2008
DOI: 10.2337/dc08-0116
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Original Research

Hyperinsulinemia in African American (AA) Adolescents Compared with Their American White (AW) Peers Despite Similar Insulin Sensitivity: A Reflection of Up-Regulated β-Cell Function?

Tamara S. Hannon, M.D.1, Fida Bacha, M.D.1, Yan Lin, Ph.D.2 and Silva A. Arslanian, M.D.1

1Division of Pediatric Endocrinology, Metabolism, and Diabetes, Children's Hospital of Pittsburgh, Pittsburgh, PA 15213
2Center for Research on Health Care, University of Pittsburgh, Pittsburgh, PA 15213

tamara.hannon{at}chp.edu

ABSTRACT

Objective: African American (AA) children are hyperinsulinemic and insulin resistant compared with American White (AW) children. Previously, we demonstrated that insulin secretion relative to insulin sensitivity was ~75% higher in AA compared with AW children, suggesting that hyperinsulinemia in AA children is not merely a compensatory response to lower insulin sensitivity. The aim of the present investigation was to assess if glucose-stimulated insulin response is higher in AA vs AW adolescents who have comparable in vivo insulin sensitivity.

Methods: The hyperinsulinemic-euglycemic and hyperglycemic clamp techniques were utilized to assess first and second phase insulin secretion. Insulin secretion relative to insulin sensitivity was calculated as the glucose disposition index.

Results: AA adolescents compared with their AW peers with comparable insulin sensitivity and body composition had higher first-phase insulin concentrations.

Conclusion: The quantitative relationship between insulin sensitivity and first phase insulin appears to differ among AA and AW adolescents.


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Copyright © 2008 by the American Diabetes Association.