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Am J Physiol Endocrinol Metab 248: E286-E291, 1985;
0193-1849/85 $5.00
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AJP - Endocrinology and Metabolism, Vol 248, Issue 3 286-E291, Copyright © 1985 by American Physiological Society

ARTICLES

Relationship between degree of obesity and in vivo insulin action in man

C. Bogardus, S. Lillioja, D. M. Mott, C. Hollenbeck and G. Reaven

Previous studies have demonstrated reduced in vivo insulin action in obese subjects compared with lean controls. However, little data is available on the relationship between degree of obesity and insulin action, and this relationship has not been shown to be independent of individual differences in maximal aerobic capacity. We studied 55 male Pima Indians and 35 male Caucasians with normal glucose tolerance. In vivo insulin action was measured using the hyperinsulinemic, euglycemic clamp technique at a plasma insulin concentration of approximately 100 microU/ml. Body composition was determined by densitometry, and maximal aerobic capacity was estimated using a graded exercise test. The results showed that degree of obesity was nonlinearly related to in vivo insulin action. In both Indians and Caucasians there was a significant decline in insulin action with increasing obesity up to a percent body fat of approximately 28-30%. Further increases in obesity in the Indians were not associated with significant changes in insulin action. Maximal aerobic capacity was positively linearly correlated with insulin action over the entire range of insulin action in both racial groups. Degree of obesity and maximal aerobic capacity were each independently associated with insulin action although these independent relationships were of marginal significance in the Caucasians. Surprisingly, individual differences in obesity and maximal aerobic capacity accounted for only half the variability observed in insulin action in these glucose tolerant subjects.


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