Background: Left ventricular(LV) torsion or twist was believed to store potential energy and to play an important role in generating diastolic suction. But there was no report about comparison of LV torsion with LV diastolic functional parameters after exercise. Methods: The study group included 42 participants (21 men and 21 women, mean age 44.9짹1.8 years, range 15 to 66 years) with normal resting LV function and no detectable structural heart disease by echocardiography and exercise treadmill test. Two-dimensional echocardiographic examinations were performed at rest and immediately after exercise treadmill test. Postexercise image acqusition was completed within 3 minutes. 3 cardiac cycles from each baseline and postexercise recording were digitized and analyzed. LV torsion was measured by difference of angles between end-diastole and end-systole, which angles were taken by 3 points(apex of scanning sector, center of cavity and midpoint of the base of anterolateral papillary muscle). Results: Participants showed normal LV systolic functions(EF=65.6짹0.8%) and normal left atrial volume index(24.4짹0.9cc/m²). Participants exercised for an average of 10min 45sec짹12 sec and achieved 94.5짹1.5% of maximally predicted for age with a mean peak heart rate 166짹3 bpm. After exercise, LV torsion increased 28%, from 12.6짹1.3 to 16.1짹1.5 degrees(p=0.019). Also LV end diastolic volume, deceleration time of transmitral E wave, the duration difference between pulmonary venous atrial flow reversal and transmitral A wave and transmitral E/A ratio decreased(p=0.000, p=0.014, p=0.024 and p=0.049, respectively). And as we expected, the change of LV torsion showed significant correlations with the change of the duration difference between pulmonary venous atrial flow reversal and transmitral A wave(r=-0.398 and p=0.011). Conclusions: LV torsion contributes to postexercise diastolic function and its measurement may provide a useful additional information in assessing the asymptomatic diastolic dysfunction.