Among patients who completed the 2-year exercise intervention , exercise training resulted in favorable changes in exercise capacity both in CAD patients with T2D ( +0.2 0.8 vs. -0.1 0.8 MET , P = 0.030 ) and without T2D ( +0.3 0.7 vs. -0.1 0.5 MET , P = 0.002 ) as compared with the control group but did not have any significant effects on major metabolic or autonomic nervous system risk factors in CAD patients with or without T2D .