Contents of SOD (A), MDA (B), BDNF (C) and NGF (D) in serum of rats in each group.

Notes: Data are presented as mean ± SD (n = 10 per group). Compared with Control group, ## P <0.01; Compared with Model group, * P <0.05, ** P <0.01. SOD, superoxidase dismutase; MDA, malondialdehyde; BDNF, brain-derived neurotrophic factor; NGF, neural growth factor.