PMID: 7015073Jun 1, 1981Paper

Normal valine disposal in obese subjects with impaired glucose disposal: evidence for selective insulin resistance

Metabolism: Clinical and Experimental
A R GlassT M Boehm

Abstract

Insulin has major effects on both glucose and branched chain amino acid metabolism. To determine whether the insulin resistance of obesity equally affects both glucose and branched chain amino acid metabolism, we measured the ability of obese and normal subjects to dispose of intravenous bolus dose of glucose (25 g) or L-valine (4 g). Basal plasma glucose levels were the same in the 18 normal and 17 obese (163 plus or minus 8% of ideal body weight) subjects, but basal plasma insulin levels were higher in the obese group (15 plus or minus 2 vs 6 plus or minus 1 microU/ml; p less than 0.001). The obese group had a slower glucose disappearance rate after glucose challenge (0.84 plus or minus 0.06 vs. 1.11 plus or minus 0.07 hr(-1); p less than 0.01) despite having a greater serum insulin response to the glucose load (26 plus or minus 4 vs 11 plus or minus 1 insulin area units; p less than 0.01), confirming insulin resistance. In contrast, disposal of a valine load was the same in normal and obese subjects, as assessed by initial and second phase exponential disappearance rates, metabolic clearance rates of valine, and volumes of distribution. In normal men, disposal rates of glucose and valine after simultaneous administration of ...Continue Reading

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