Legend. Cardiac energy metabolism and function in dilated cardiomyopathy before and 2 and 8 months after exercise training (ET) using magnetic resonance (MR). ³¹P-MR spectroscopy and MR images show that LV mass, EF, and phosphocreatine (PCr) and adenosine triphosphate (ATP) concentrations are unchanged during follow-up in control (top) but improved after ET (bottom). The black line represents a fixed starting point of the PCr signal at baseline. See page 1888.