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Cu-Zn superoxide dismutase-1 (SOD), catalase (CAT), glutathione peroxidase-1 (GPx), and glutathione reductase (GPr) expression in brain tissue in young and aged rats subjected to apneas or sham. Results are expressed as percentage of increase over young sham rats. Results are shown as mean ± standard error. * and ** are differences between treatment P < 0.05 and P < 0.01, respectively. + and ++ are differences between age P < 0.05 and P < 0.01, respectively.
