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Figure 2 M-mode echocardiography in 100-km ultramarathon runners. (A) A 44-year-old man. The left ventricular end-diastolic diameter is 75 mm. (B) A 48-year-old man. The aortic diameter (Ao) is 50 mm. (C) A 37-year-old man. The left atrial diameter (LA) is 49 mm. LV = left ventricle; RVOT = right ventricular outflow tract.