Effect of exposure to noise (85 dB (A)) and/or toluene (300 ppm) and protection effect of Olive leaf extracts (40 mg/kg bw) on rat heart oxidative parameters. (A): Lipid peroxidation, (B): Catalase activity and (C): SOD activity. Results are expressed as means ± SD of six animals. Different pairs of groups were compared using the Mann-Whitney U test. * p < 0.05 vs control group, ** p ≤ 0.05 vs control group, € p < 0.05 vs NT group, ¥ p < 0.05 vs N group, $ p < 0.05 vs T group.