Aerobic exercise increases eNOS and decreases iNOS mRNA expression in the aortas of prediabetic rats. (A) eNOS, (B) iNOS and (C) nNOS mRNA expression levels. *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 synthase; eNOS, NOS, endothelial; iNOS, NOS, inducible; nNOS, NOS, brain.