GAP43 and myocardial infarction: As shown in Figure 3A, B, C, compared with the SC group, the protein expression of TH (F2,15 = 3.01, P = 0.08), GAP43 (F2,12 = 9.38, P = 0.004) and NGF (F2,16 = 45.11, P<0.001) in the LV was significantly increased after MI (P<0.05, P<0.01, and P<0.01, respectively), which was normalized by aerobic exercise (P<0.05, P<0.01, and P<0.01, respectively) (Figure 3A, B, C).