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1 Division of Kinesiology, University of Michigan, Ann Arbor, Michigan, United States
2 Division of Kinesiology, Room 3040E, University of Michigan, Ann Arbor, Michigan, United States
* To whom correspondence should be addressed. E-mail: gcartee{at}umich.edu.
The primary purpose of this study was to determine the effect of prior exercise on insulin-stimulated glucose uptake with physiologic insulin in isolated muscles of mice. Male C57BL/6 mice completed a 60min treadmill exercise protocol or were sedentary. Paired epitochlearis, soleus, and extensor digitorum longus (EDL) muscles were incubated with [ 3H]-2-deoxyglucose without or with insulin (60µU/ml) to measure glucose uptake. Insulin-stimulated glucose uptake for paired muscles was calculated by subtracting glucose uptake without insulin from glucose uptake with insulin. Muscles from other mice were assessed for glycogen and AMPK Thr172 phosphorylation. Exercised versus sedentary mice had decreased glycogen in epitrochlearis (48%, P<0.001), soleus (51%, P<0.001) and EDL (41%, P<0.01) and increased AMPK Thr172 phosphorylation (P<0.05) in epitrochlearis (1.7 fold), soleus (2.0 fold) and EDL (1.4 fold). Insulin-independent glucose uptake was increased 30min post-exercise versus sedentary in the epitrochlearis (1.2 fold, P<0.001), soleus (1.4 fold, P<0.05) and EDL (1.3 fold, P<0.01). Insulin-stimulated glucose uptake was increased (P<0.05) ~85min after exercise in the epitrochlearis (sedentary: 0.266 ± 0.045 mmol x g-1 x 15min-1; exercised: 0.414 ± 0.051) and soleus (sedentary: 0.102 ± 0.049; exercised: 0.347 ± 0.098) but not in the EDL. Akt Ser473 and Akt Thr308 phosphorylation for insulin-stimulated muscles did not differ in exercised versus sedentary. These results demonstrate enhanced submaximal insulin-stimulated glucose uptake in the epitrochlearis and soleus of mice 85min post-exercise and suggest that it will be feasible to probe the mechanism of enhanced post-exercise insulin sensitivity using genetically modified mice.
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