The effects of high(HI) and low(LI) intensity exercise training were examined on the change of insulin-regulatable glucose transporter protein(Glut-4) content, and the activity of oxidative enzyme citrate synthase in the epitrochlearis of obese Zucker(fa/fa) rats. Sedentary(SED) and lean(LN) Zucker(Fa/?) rats were used as controls. The content of Glut-4 protein was determined by Westem-blotting and the citrate synthase activity was measured by the method of Srere. No significant difference in Glut-4 protein content was observed between LN and SED rats. However, there was a significant difference between SED and HI rats in Glut-4 protein content(p<0.05). The difference between HI and LI rats approached significantance(p<0.09). Citrate synthase activity was not significantly different between LN and SED rats. but there was a significant difference between SED and exercise trained groups(p<0.05). Between LI and HI rats, citrate synthase activity was significantly different. Glut-4 protein content in epitrochlearis of obese rats was significantly correlated with cirtrate synthase activity(r=0.55). The results suggest that the increased in Glut-4 protein content due to exercise training is related to the degree of training.