MKI67 and myocardial infarction: 2012). Cosmo et al. (2012) found that 30 days of swimming post-MI increased LVEF and improved adverse ventricular remodeling following mononuclear cell transplantation in the heart. It is known, however, that swimming elicits different cardiovascular responses than other forms of aerobic exercise and hence may not be translationally applicable to patients (Flaim et al. 1979). In the present study, the finding that chronic treadmill running increased the number of Ki67+ cells is encouraging, but these findings did not lead to improved LV function or remodeling.