CAT and hypoxia: The activity of antioxidant enzyme superoxide dismutase and catalase on oxidized myoblasts did not significantly change comparing POST- vs. PRE-Hypoxia (SOD: 27.9 ± 0.4 and 27.2 ± 0.5 U/ng protein; Cat: 7.7 ± 5.9 and 2.9 ± 2.2 U/ng protein; data not shown).