A total of 54 patients with HF and a reduced LVEF (HFrEF) (LVEF less than 50 %; age of 67.1 ± 11.6 years; 43 men) who underwent initial AF ablation procedures were included; 14 (25.9 %) patients underwent CR (rehabilitation-group) and the remaining 40 (74.1 %) did not (non-rehabi...