Associations between PA and AF stratified by LA size (HR ±95% CI): the Tromsø Study 1994–1995
| N (n=2479) | AF events, % (n) | Person-years (mean±SD) | Model 1, HR (95% CI) | Model 1, P-value | Model 2, HR (95% CI) | Model 2, P-value | |
| LA normal | 1714 | 13.6 (233) | 17.0 (6.5) | ||||
| Inactive | 1019 | 14.3 (146) | 16.4 (6.7) | 1.00 (ref.) | 1.00 (ref.) | ||
| Low | 279 | 14.0 (39) | 17.5 (6.6) | 0.88 (0.62 to 1.26) | 0.488 | 1.07 (0.75 to 1.54) | 0.707 |
| Moderate | 286 | 10.1 (29) | 18.2 (5.9) | 0.61 (0.41 to 0.91) | 0.015 | 0.73 (0.49 to 1.09) | 0.125 |
| Vigorous | 130 | 14.6 (19) | 17.9 (6.2) | 0.91 (0.56 to 1.46) | 0.681 | 1.05 (0.65 to 1.71) | 0.837 |
| LA enlarged | 765 | 21.7 (166) | 15.7 (6.6) | ||||
| Inactive | 483 | 25.5 (123) | 14.9 (6.7) | 1.00 (ref.) | 1.00 (ref.) | ||
| Low | 104 | 10.6 (11) | 17.1 (6.2) | 0.34 (0.18 to 0.63) | 0.001 | 0.41 (0.22 to 0.77) | 0.005 |
| Moderate | 105 | 18.1 (19) | 16.8 (6.2) | 0.60 (0.37 to 0.98) | 0.041 | 0.62 (0.38 to 1.02) | 0.061 |
| Vigorous | 73 | 17.8 (13) | 17.5 (6.1) | 0.56 (0.32 to 0.99) | 0.047 | 0.62 (0.34 to 1.12) | 0.113 |
Model 1 was unadjusted. Model 2 was adjusted for age, sex, body mass index and systolic blood pressure.
PA, physical activity; LA, left atrial/left atrium; AF, atrial fibrillation; ref., reference.;