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- W1972674013 abstract "It is unknown whether resistance to insulin- or exercise-stimulated glucose uptake reflects a spatially uniform or nonuniform decrease in glucose uptake within skeletal muscle. We compared the distributions of muscle glucose uptake and blood flow in eight patients with type 1 diabetes (age 24 +/- 1 yr, body mass index 22.0 +/- 0.8 kg/m2) and seven age- and weight-matched normal subjects using positron emission tomography, [18F]-fluoro-deoxy-glucose, and [15O]-water. Both groups were studied during euglycemic hyperinsulinemia and one-legged exercise. Heterogeneity was evaluated by calculating relative dispersion (SD divided by mean * 100%) of glucose uptake (RD(g)) and flow (RD(f)) in all pixels within a region of interest in femoral muscle. At rest insulin-stimulated glucose uptake was significantly lower in the type 1 diabetic patients (42 +/- 7 micromol/kg per min) than in the normal subjects (78 +/- 9 micromol/kg per min, P < 0.001), while muscle blood flows were similar (26 +/- 1 vs. 31 +/- 3 ml/kg muscle per min, respectively). The exercise-induced increment in glucose uptake but not in blood flow was also significantly lower in the type 1 diabetic patients than in the normal subjects. Heterogeneity of glucose uptake but not of blood flow was greater in the insulin-resistant type 1 diabetic patients both at rest (RD(g) 31 +/- 1 vs. 25 +/- 2%, patients with type 1 diabetes vs. normal subjects, P < 0.05) and during exercise, compared with normal subjects (27 +/- 1 vs. 21 +/- 2%, respectively, P < 0.05). Exercise increased both glucose uptake and blood flow several-fold and significantly decreased both RD(g) and RD(f). Heterogeneity of RD(g), was inversely associated with total glucose uptake (r = -0.54, P < 0.001, pooled data) and was highest in the most insulin-resistant patients. We concluded that both glucose uptake and blood flow are characterized by heterogeneity in human skeletal muscle, whose magnitude is inversely proportional to respective mean values. This implies that an increase in glucose uptake in human skeletal muscle is not a phenomenon, by which each unit increases its glucose uptake by a fixed amount but rather a spatially heterogeneous process." @default.
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- W1972674013 date "2001-11-01" @default.
- W1972674013 modified "2023-10-16" @default.
- W1972674013 title "Evidence for Spatial Heterogeneity in Insulin- and Exercise-Induced Increases in Glucose Uptake: Studies in Normal Subjects and Patients with Type 1 Diabetes" @default.
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- W1972674013 doi "https://doi.org/10.1210/jcem.86.11.7979" @default.
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