Effect of the fish oil supplementation on plasma activity of (A) creatine kinase (CK) and (C) lactate dehydrogenase (LDH), in response to a single bout of strength exercises, at baseline (pre-training period) and after 6 weeks of daily undulating strength training (post-training period). On the left, time-dependent plasma CK and LDH activities (before and 0, 24, and 48 h after a single bout of strength exercises). On the right, decrease in the area under curve (AUC) of the temporal plasma CK (B) and LDH (D) activities after 6 weeks of daily undulating strength training. Results presented as mean ± S.E.M. p < 0.02 for CK activity, and p < 0.05 for LDH activity, comparing control group with fish oil group.