Figure 4. Comparison of baseline vs. post-exercise values of cardiac biomarkers NT-proBNP (A), hs-cTnT (B), CK MB (C), and Lp-PLA₂ (D) for CE, short HIIE, and long HIIE. Between test protocols, no significant difference was found for the exercise-induced increase (or decrease, respectively) of cardiac biomarkers. HIIE, high-intensity interval exercise; CE, continuous exercise; NT-proBNP, N-terminal pro B-type natriuretic peptide; hs-cTnT, high-sensitivity cardiac troponin T; CK MB, creatine phosphokinase MB; Lp-PLA₂, Lipoprotein-associated phospholipase A₂. *, significant difference between pre- vs. post-exercise value (p < 0.05).