Long distance training associated to HIIT protocol does not induce changes in blood biochemical markers in adult marathoners

Abstract

Objective: to verify blood markers during a 12-week training protocol and after Sao Paulo Marathon.Methods: Blood samples of 9 male marathoners were collected before (C1) and after (C2) 12-weektraining protocol, before (C3) and after (C4) marathon. Muscle and liver damage markers (creatinekinase [CK-MM], aspartate aminotransferase [AST], alanine aminotransferase [ALT]), oxidativestress levels (thiobarbituric acid reactive substances [TBARS]) and serum iron concentration weremeasured. Results: changes were identified comparing moment C4 to other moments for CK-MMand iron. For AST, ALT, and TBARS no differences were identified. Conclusion: strenuous exercisesmight elicit changes on blood markers, needing follow up strategies to avoid impairments toathletes’ performance and health