Exercise has been noted in some, but not all studies, to elicit an oxidative stress response. The discrepancy in findings may be related to differences in exercise intensity across study protocols. Biomarkers of oxidative stress were compared for aerobic and anaerobic exercise bouts of different intensities and durations. On different days, exercised-trained men (n=12; 21-35 yrs) performed aerobic cycle exercise (60 min at 70% HR reserve) and anaerobic cycle sprints (five, 60 sec sprints at 100% max GXT watts; and ten, 15 sec sprints at 200% max GXT watts). Blood was collected before and 0, 30, and 60 min post-exercise and analyzed for malondialdehyde (MDA), hydrogen peroxide (H2O2), and Trolox Equivalent Antioxidant Capacity (TEAC). No differences were noted in MDA or H2O2. TEAC was significantly higher at 30 and 60 min post-exercise. In exercise-trained men, no increase was noted in post-exercise oxidative stress, possibly due to the increase in antioxidant defense
