This study proposes a new vision in characterizing the ventricular diastole and systole. The approach is made starting from energetic consideration, by applying the energy conservation low for the blood entering from left atrium in to left ventricle during diastole period. We had proposed two brand new coefficients to describe the cardiac cycle and we had verified if the coefficients are correlated with classically used parameters. We consider that the energetic approach take into consideration the whole mechanical movement that is happening inside the heart and can offer a very synthetic and scientific solid view about the cardiac cycle. The new coefficients are simply to be calculated and as you will see from our research the correlation with other classically used parameters is obvious.