Insulin sensitivity and acute insulin response in African-Americans, non-Hispanic whites, and Hispanics with NIDDM: the Insulin Resistance Atherosclerosis Study

Diabetes
S M HaffnerM F Saad

Abstract

NIDDM is usually characterized by beta-cell failure and decreased insulin sensitivity. It has been reported that a high proportion of African-American NIDDM subjects are insulin sensitive. To examine this issue, we determined insulin sensitivity (S(I)) in 479 NIDDM subjects by minimal model analyses of frequently sampled intravenous glucose tolerance (FSIGT) from the Insulin Resistance Atherosclerosis Study (IRAS), a large multicenter study of insulin sensitivity and cardiovascular risk in African-Americans, Hispanics, and non-Hispanic whites. The African-Americans and non-Hispanic whites were sampled in Los Angeles and Oakland, California. The non-Hispanic whites and Hispanics were sampled in San Antonio, Texas, and San Luis Valley, Colorado. We defined the proportion of insulin-sensitive (S(I)) subjects as > or =1.61 min-1 x microU-1 x ml-1, which is above the median for nondiabetic subjects of all ethnic groups in the IRAS. Using this definition, the proportion of insulin-sensitive diabetic subjects was very low in all ethnic groups (non-Hispanic whites [14.3%] vs. African-Americans [6.5%], P = 0.039 in Los Angeles and Oakland; non-Hispanic whites [6.8%] vs. Hispanics [4.9%], P = 0.737 in San Luis Valley and San Antonio). Th...Continue Reading

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