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M-mode echocardiographic images from sham + sedentary (Sed) (A), sham + exercise training (ExT) (B), chronic heart failure (CHF) + Sed (C), and CHF + ExT (D) hearts. Arrows demarcate left ventricular end-systolic diameter (LVESD) and end-diastolic diameter (LVEDD) dimensions. Notice that LVESD and LVEDD were increased in CHF + Sed and CHF + ExT rats compared with sham + Sed and sham + ExT rats.
