Intensive athletic conditioning is associated with hemodynamic changes and affects the loading conditions of the heart. It is known that the heart of an athlete has become physiologically adapted by prolonged training. These changes include an increase in left ventricular (LV) chamber size, wall thickness, and mass.(1-5) It is reported that athletes involved in mainly static or isometric exercise develop concentric hypertrophy, and in contrast to this, athletes involved in endurance training or isotonic exercise develop eccentric hypertrophy. There are a large number of echocardiographic studies on LV wall thickness and dilatation, but there are very few studies concerning left atrial (LA) mechanical function in the athlete's heart. This study was undertaken to assess the possible adaptive changes in LA mechanical function in elite athletes.