Finally the groups were composed of PTG (n=10) and control group (CG, n=10). Heart rate variability (HRV) on rest and during submaximal test was determined by linear analysis (rMSSD and SDNN) and nonlinear indices SD1, SD2 and sample entropy (SE). In addition, the physiological responses were obtained during cardiopulmonary exercise testing (CPX), the walking distance (WD) on six minute walking test and submaximal constant speed testing (CST). PTP consisted of 30 minutes of aerobic exercise training on a treadmill, 3 times per week at 70% of CPX peak speed rate. Patients were evaluated on baseline, 6 and 12 weeks.