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Revista Brasileira de Medicina do Esporte
On-line version ISSN 1806-9940
PAULI, José Rodrigo; ROPELLE, Eduardo Rochete; CINTRA, Dennys Esper and SOUZA, Cláudio Teodoro de. Effects of physical exercise in the Ampkα expression and activity in high-fat diet induced obese rats. Rev Bras Med Esporte [online]. 2009, vol.15, n.2, pp.98-103. ISSN 1806-9940. http://dx.doi.org/10.1590/S1517-86922009000200003.
INTRODUCTION: High-fat diet is a special risk factor in the development of insulin resistance and type 2 diabetes. OBJECTIVE: To investigate the effects of physical exercise on the AMPK expression and activity in high-fat diet induced obese rats. METHODS: Wistar rats were randomly divided into four groups and received either a rat maintenance diet (control group) or an isocaloric high-fat diet (HFD) (sedentary groups and exercised groups) for four months. Two different exercise protocols were utilized: acute or chronic swimming exercise. Insulin tolerance test was performed to estimate whole-body insulin sensitivity. AMPKα and GLUT4 as well as p-AMPKα and pACC of rats' skeletal muscle levels were determined using Western blot. RESULTS: Insulin tolerance test revealed a significantly impaired insulin action after HFDt feeding, indicating high-fat induced insulin resistance when compared to control group. Four months of HFD treatment induced to significant decrease of AMPKα (2.2-fold) and GLUT4 (2.5-fold) protein contents and also of p-AMPKα (2.4-fold) and p-ACC (2.5-fold) in sedentary rats' skeletal muscle when compared with the control group. Both exercise protocols resulted in increase of AMPKα and ACC phosphorylation and increase in insulin sensitivity, while chronic physical exercise alone provoked increase in these proteins expression (p < 0.05). CONCLUSION: High-fat feeding impairs AMPKα activity, while AMPKα activation by physical exercise improves insulin resistance, thus indicating that obese rats normally have the AMPK pathway preserved.
Keywords : obesity; insulin resistance; physical education and training.