Immunoblot analyses of the superoxide dismutase (SOD) family of isoforms revealed that neither ecSOD (A), MnSOD (B), nor Cu/ZnSOD (C) protein levels were significantly altered by occlusion or exercise training. Protein was quantified by densitometry analysis, normalized to β-actin, and expressed relative to the density of nonoccluded arterioles of sedentary (SED) pigs. Evaluation of SOD activity also demonstrated no significant different between arteriolar treatment groups. Furthermore, bradykinin (BK; 10 nM) treatment had no effect on SOD activity compared with control (PSS; conditions). EX, exercise-trained. Values are means ± S.E.M. of the number of animals indicated.