Alan G. Japp et al. JACC 2016;67:2996-3010 Differentiation of Athlete’s Heart From Early DCM by Myocardial Deformation Imaging Two-dimensional speckle tracking-derived longitudinal strain curves from 6 myocardial segments on standard 4-chamber view. (A) An endurance cyclist with a left ventricular (LV) end-diastolic diameter of 62 mm and mildly impaired LV ejection fraction exhibiting normal longitudinal strain (mean global strain of −17%). (B) A patient with idiopathic dilated cardiomyopathy (DCM) with mild LV enlargement (LV end-diastolic diameter 59 mm) and borderline LV ejection fraction exhibiting reduced longitudinal strain (mean global strain of −7%). Alan G. Japp et al. JACC 2016;67:2996-3010 American College of Cardiology Foundation