Apexcardiogram (ACG) was applied clinically to evaluation of hemodynamics and cardiac functicn. especially diastolic function. So far no information in this field is available. 193 athletes engaged in different types of training --- including 118 males with an average age of 22.4 and training period of 4.5 years and 75 females with an average age of 21.4 years and training period of 5.2 years --- were examined with ACG in left lateral decubitus position. A/H ratio, rapid filling wave (RFW), slow filling wave (SFW) and SFW/RFW ratio were calculated.1. The sex difference was significant in RFW (P