As summarized in Table 2, VO2peak in AF patients was significantly correlated with multiple indicators including age (r = −0.296, P = 0.002), height (r = 0.301, P = 0.002), BMI (r = −0.269, P = 0.005), gender (r = −0.451, P < 0.001), LAD (r = −0.306, P = 0.002), NT-proBNP (r = −0.379, P < 0.001), hemoglobin (r = 0.316, P = 0.001), eGFR (r = 0.309, P = 0.001), FTSTS (r = −0.303, P = 0.002), TUG (r = −0.253, P = 0.009), 6MWD (r = 0.388, P < 0.001), and systolic blood pressure (r = −0.326, P = 0.001). This evidence concerns the gene NPPB and atrial fibrillation.