期刊
JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
卷 95, 期 8, 页码 4048-4051出版社
ENDOCRINE SOC
DOI: 10.1210/jc.2010-0018
关键词
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资金
- University of Southern California Transdisciplinary Research on Energetics and Cancer [U54 CA 116848]
- National Institute of Child Health and Human Development [RO1 HD/HL 33064]
- Dr. Robert C. and Veronica Atkins Foundation
- National Cancer Institute [T32 CA 09492]
- National Institute on Aging [5 T32 AG000093-24]
Introduction: African-American children have a greater acute insulin response to iv glucose (AIR) compared with Latino children despite a similar degree of insulin resistance and body composition. It is unclear whether African-Americans demonstrate an exaggerated insulin response to an oral glucose challenge and whether any differences are seen in more obese children in advanced pubertal development. Purpose: Our objective was to compare glucose and insulin indices derived from an oral glucose tolerance test (OGTT) and iv glucose tolerance test (IVGTT) in sedentary, obese African-American (n = 59) and Latino (n = 83) adolescents. Methods: Glucose and insulin incremental area under the curve was measured during an OGTT, and AIR, insulin sensitivity, disposition index, and glucose effectiveness were assessed during an IVGTT. Body composition was assessed via dual-energy x-ray absorptiometry and magnetic resonance imaging. Results: From the OGTT, glucose and insulin IAUC were 29.1 and 22.5% lower (P = 0.01) in African-Americans compared with Latino adolescents. From the IVGTT, insulin sensitivity and glucose effectiveness were 41.7% (P < 0.01) and 50.0% (P = 0.02) lower in African-Americans compared to Latinos. AIR (P = 0.001) and disposition index (P = 0.02) were 63.0 and 48.8% higher in African-Americans, respectively, compared with Latinos. These findings persisted after controlling for body composition and fat distribution. Conclusions: There were marked differences in glucose and insulin indices derived from the OGTT and IVGTT. African-Americans were more insulin resistant as measured by the IVGTT compared with the Latino adolescents. However, the well-described hyperinsulinemia in response to iv glucose was not observed after oral glucose in African-American adolescents. (J Clin Endocrinol Metab 95: 4048-4051, 2010)
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