The aim of thisstudy was finding the association of body size and body composition with blood characteristics and left ventricular structure. Twelveuntrained male students among students of Islamic Azad University Chalos were selected randomly. Physical parameters, blood samples and echocardiography variableswere measured by using conventional methods. Coulter Counter echocardiographydevice was used by the relevant specialists. Correlation between levels of physical, hematological and echocardiography factors was measuredby using the Pearson correlation coefficient. The results of the relationship between the variables showed that there wasa significant correlation between height, weight, body surface area, maximum power, the end diastolic diameter, left ventricular mass. This study showed that there wassignificant relationship between the amount of red blood cells and the end diastolic diameter and wall thickness between ventricular. Increased number of red blood cells and plasma volume of venous blood returns to the heart, causing a significant positive correlation in the end diastolic diameter. But significant negative correlation between ventricular wall thicknesses in left ventricular failure was not correlation with left ventricular mass.
