 Sample size: Based on previous work84,95,96,101-105, a sample size of 50 in each group 100 total will be sufficient to detect a between-group differences in QoL, 6min walk, PWV, dyspnea and hospital readmission rates following PR α0.05, β0.8. Based on our recent work, this sample could detect a 10 difference in physical activity following PR α0.05, β0.8. One hundred patients will also to allow for stratification of physiological and psychological responses with PR. 