XDH and myocardial infarction: The increased cardiac ROS levels in both MI groups were associated to a high NOX activity in MI groups (Figure 2B, 42.5±1.3 vs 60.5±1.5 and 61.1±1.8 nmol·h-1·mg-1, for Sham, MI, and MI-lactate groups, respectively), while NADox (Figure 2C) and XO (Figure 2D) activities remained similar among groups.