SOD1 and ischemia: Conducted experiments on 91 male albino rats; induced ischemia by occluding the left coronary artery for 5 minutes; randomized rats into 2 control and 2 experimental groups; experimental group 1 received laser irradiation, experimental group 2 received wideband red light; irradiation started immediately after removal of the ligature and lasted for 10 min; measured ECG, LPO products, and SOD activity