Does a faster finishing time and higher number of completed races increase the risk of arrhythmias in male participants of a 90 km cross-country skiing event?
High-intensity endurance exercise, as indicated by faster finishing times and more completed races in cross-country skiing, is associated with an increased risk of arrhythmias, particularly atrial fibrillation and bradyarrhythmias.
Among male participants of a 90 km cross-country skiing event, a faster finishing time and a high number of completed races were associated with higher risk of arrhythmias. This was mainly driven by a higher incidence of AF and bradyarrhythmias. No association with SVT or VT/VF/CA was found.
Andersen et al. (Tue,) studied this question.