Abstract In high-performance athletes, especially those who practice endurance sports that involve high-intensity training for long periods, the heart shows electrical, functional, and structural changes, increasing the likelihood of ventricular and atrial arrhythmias. It is already known that these athletes have increased left atrium (LA) diameter and indexed volume. However, the effects of these changes on atrial function are not yet fully understood. The mechanics of the LA involve three functions: 1) it acts as a reservoir that collects venous […]