Bjørkavoll-Bergseth M, Kleiven O, Auestad B, et al. - Since there is a lack of information on the exact mechanisms causing cardiac troponin (cTn) rise post-exercise, researchers determined how the heart rate (HR) influences exercise-induced cTn increase. For this purpose, they used sports watch data from a large bicycle competition. They selected the participants from NEEDED (North Sea Race Endurance Exercise Study). A 91-km recreational mountain bike race (North Sea Race) was finished by all. Twenty-four hours prior to and 3 and 24 hours following the race, clinical status, ECG, blood pressure, and blood samples were collected. There were 177 participants who were, on average, 44 years old. For both cTnI and cTnT, at both 3 and 24 hours post-exercise, the duration of exercise with an HR > 150 beats per minute was identified as a significant predictor in multiple regression models. Overall, a crucial predictor of physiological exercise-induced cTn rise was the duration of elevated HR.