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- W2280495045 abstract "The lumped constant (LC) is used to convert the clearance rate of 2-deoxy-d-glucose (2-DG cr ) to that of glucose (Glc cr ). There are currently no data to validate the widely used assumption of an LC of 1.0 for human skeletal muscle. We determined the LC for 2-deoxy-[1- 14 C]glucose (2-DG) in 18 normal male subjects (age, 29 ± 2 yr; body mass index, 24.8 ± 0.8 kg/m 2 ) after an overnight fast and during physiological (1 mU · kg −1 · min −1 insulin infusion for 180 min) and supraphysiological (5 mU · kg −1 · min −1 insulin infusion for 180 min) hyperinsulinemic conditions. Normoglycemia was maintained with the euglycemic clamp technique. The LC was measured directly with the use of a novel triple tracer-based method. [3- 3 H]glucose, 2-[1- 14 C]DG, and [ 12 C]mannitol (Man) were injected as a bolus into the brachial artery. The concentrations of [3- 3 H]glucose and 2-[1- 14 C]DG (dpm/ml plasma) and of Man (μmol/l) were determined in 50 blood samples withdrawn from the ipsilateral deep forearm vein over 15 min after the bolus injection. The LC was calculated by a formula involving blood flow calculated from Man and the Glc cr and 2-DG cr . The LC averaged 1.26 ± 0.08 (range 1.06–1.43), 1.15 ± 0.05 (0.99–1.39), and 1.18 ± 0.05 (0.97–1.37) under fasting conditions and during the 1 and 5 mU · kg −1 · min −1 insulin infusions (not significant between the different insulin concentrations, mean LC = 1.2, P < 0.01 vs. 1.0). We conclude that, in normal subjects, the LC for 2-DG in human skeletal muscle is constant over a wide range of insulin concentrations and averages 1.2." @default.
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- W2280495045 date "2000-07-01" @default.
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- W2280495045 title "Direct measurement of the lumped constant for 2-deoxy-[1-<sup>14</sup>C]glucose in vivo in human skeletal muscle" @default.
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- W2280495045 doi "https://doi.org/10.1152/ajpendo.2000.279.1.e228" @default.
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