Aerobic exercise increases (A) eNOS and decreases (B) iNOS activity in the aortas of prediabetic rats. *P<0.05 vs. the control/control group, #P<0.05 vs. the control/exercise group, $P<0.05 vs. the prediabetes/control group. NOS, nitric oxide synthases; eNOS, NOS, endothelial; iNOS, NOS, inducible.