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Horm Metab Res 2001; 33(2): 89-95
DOI: 10.1055/s-2001-12403
Original Clinical
© Georg Thieme Verlag Stuttgart · New York

A Novel Use of the Hyperinsulinemic-Euglycemic Clamp Technique to Estimate Insulin Sensitivity of Systemic Lipolysis

M. Stumvoll1 , H. G. Wahl1 , K. Löblein, R. Becker, A. Volk, W. Renn, S. Jacob, H. Häring
  • Department of Endocrinology and Metabolism, Eberhard-Karls-Universität, Tübingen, Germany
  • 1 These authors contributed equally to the study
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Publication History

Publication Date:
31 December 2001 (online)

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The aim of the present study was to assess whether a standard hyperinsulinemic-euglycemic clamp can provide an estimate for the antilipolytic insulin sensitivity. For this purpose, we infused 9 non-obese, healthy volunteers with [2H5]glycerol and used the glycerol rate of appearance (Ra) in plasma as an index for systemic lipolysis during a standard (1 mU/kg · min, 120 min) and a 3-step (0.1, 0.25, 1.0 mU/kg · min) hyperinsulinemic-euglycemic clamp. The insulin concentration, which half-maximally suppressed lipolysis (EC50) in the three-step clamp, was considered to be the gold standard for the antilipolytic insulin sensitivity. Glycerol Ra decreased from 1.53 ± 0.11 µmol/kg·min to 0.60 ± 0.09 µmol/kg · min (p < 0.001) during the standard clamp. The decrease in Ra at most time points during the standard clamp significantly correlated with the EC50. The highest correlation for the % decrease of glycerol Ra from baseline was found at 60 min (r = 0.96, p < 0.001) making this parameter a useful index for the antilipoytic insulin sensitivity. Neither plasma glycerol nor plasma free fatty acid (FFA) concentrations were significantly correlated with the EC50. In conclusion, the standard hyperinsulinemic-euglycemic clamp in combination with isotopic determination of glycerol Ra provides a reasonable estimate for the antilipolytic insulin sensitivity. In healthy subjects, the parameter best suited to estimate the insulin EC50 (by linear correlation) was the percentage decrease of glycerol Ra at 60 min.

Key words:

Insulin Resistance - Obesity - Type 2 Diabetes - Free Fatty Acids - Glycerol

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Dr. M. Stumvoll

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