Effect of metformin on substrate utilization after exercise training in adults with impaired glucose tolerance
2013
Malin, Steven K. | Braun, Barry
Metformin attenuates the higher insulin sensitivity that occurs with exercise training. Sixteen people with prediabetes trained for 10 weeks while taking metformin (n = 8) or placebo (n = 8). Substrate utilization was assessed using glucose kinetics and indirect calorimetry. After training, exercise whole-body fat oxidation was higher and glycogen use lower (p < 0.05), with no differences between groups. Blood glucose use was unchanged. Training-induced enhancement of insulin sensitivity (clamp) correlated with higher peak oxygen uptake (r = 0.70; p < 0.05), but was independent of glucose kinetic and substrate metabolism.
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