Diabetes, Vol 44, Issue 2 141-146, Copyright © 1995 by American Diabetes Association

ARTICLES

Does intra-abdominal adipose tissue in black men determine whether NIDDM is insulin-resistant or insulin-sensitive?

MA Banerji, RL Chaiken, D Gordon, JG Kral and HE Lebovitz
Department of Medicine, State University of New York health Science Center at Brooklyn 11203.

Insulin resistance in black Americans with non-insulin-dependent diabetes mellitus (NIDDM) is found in only 60% of those with a body mass index (BMI) of < 30 kg/m2, suggesting that NIDDM can occur independent of peripheral insulin resistance. When insulin resistance is present, it is not necessarily correlated with obesity. Numerous studies have shown that increased amounts of intra-abdominal adipose tissue are associated with various metabolic abnormalities. We therefore investigated whether the occurrence of insulin resistance in black NIDDM men could be explained by the pattern of body adipose tissue distribution rather than total adiposity. Twenty-two near-normoglycemic black men (fasting plasma glucose [mean +/- SD] = 104 +/- 10 mg/dl, HbA1c = 4.6 +/- 0.78%, age 48.9 +/- 9.2 years, and BMI 26.5 +/- 2.4 kg/m2) were studied. The euglycemic insulin clamp with 1 mU.kg-1.min-1 insulin infusion and D-[3-3H]glucose was used to measure insulin action. Whole-body computed tomography with 22 scans was used to determine body composition. Total body adipose tissue was 19.6 +/- 7.51, and the percentage of body fat was 27 +/- 7. Glucose disposal ranged from 2.5 to 8.1 mg.kg-1.min-1 (10 men were insulin-sensitive and 12 were insulin-resistant). There was a strong inverse correlation between glucose disposal and the proportion of total adipose tissue in the intra-abdominal region (r = -0.78, P < 0.001), while there was no correlation between glucose disposal and total muscle volume, BMI, total adipose tissue volume, or total subcutaneous adipose tissue volume.(ABSTRACT TRUNCATED AT 250 WORDS)
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