Plasma markers of oxidative stress ( protein carbonyls ( PC ) , lipid hydroperoxides ( LOOH ) , @-nitrotyrosine ( @-NT ) , total antioxidant capacity ( TAC ) and catalase ( CAT ) activity ) , inflammation ( interleukin-@ ( IL-@ ) and C-reactive protein ( CRP ) ) and nitric oxide metabolites ( NOx ) were assessed before and after training .