Effects of Routine Cycling Training on the Release of Cardiac Biomarkers in Trained Adolescent Cyclists

 

Abstract:
This study examined the release of blood cardiac biomarkers subsequent to two types of routine cycling training in adolescent cyclists: repeated bouts of high-intensity sprint (HI) and an endurance workout at moderate intensity (END). Whole blood cardiac troponins (cTnT and cTnI) and N-terminal pro-brain natriuretic peptide (NT-proBNP) were assessed in 12 trained adolescent cyclists (age=16.4±1.5 years) after the HI and END trainings for 2 separate days. The cTnT and NT-proBNP were undetectable after HI and END in all athletes except one cTnT case after END (0.03–0.10 ng.ml-1). The cTnI levels in 4 out of 12 subjects after the END (median=0.015 and range=0–0.08 ng.ml-1) exceeded the 0.03 ng.ml-1 cutoff value for myocardial injury. However, no cyclist displayed a positive cTnI value after the HI. These results provide new information regarding trends in cardiac markers in adolescent cyclists during training. Such information may be used by physicians in routine clinical evaluations. 

 

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