Introduction: The characteristics of the athlete`s electrocardiogram are still today the subject of multiple publications whose physiological meaning has been clarified as the different variants have been correlated with a sophisticated cardiological evaluation and a prolonged follow-up. There are different alterations of repolarization described in the sports population, among them the most frequently reported in the literature are: early repolarization, vagotonic T waves, ST-T alterations, etc. Vagotonic T waves are a common finding in the athlete population, although currently, the dynamic changes of this finding during exercise, have an uncertain meaning. The aim of our study was to determine its prevalence in a population of elite athletes and analyze their behavior at different stages of the exercise. Methods: A population of 91 male, professional soccer players of a team of the first division of the Spanish football league (age 26 years ± 4.49 years) were analyzed. The presence of vagotonic T waves was assessed at baseline electrocardiogram and their association with different electrocardiographic and echocardiographic variables was also analyzed. The dynamic changes of the morphology of these waves were studied at different stages during a maximal effort trial. Results: The presence of vagotonic T waves was identified in the baseline ECG in 14 (15%) subjects. In 13 out of 14 athletes (92%), a dynamic behavior of the vagotonic waves was observed. It had a progressive disappearance during exercise and it reappeared at the early stages of recovery, with similar voltages to that observed at the baseline electrocardiogram. Conclusions: This study evidence that vagotonic T waves are mainly due to the predominance of parasympathetic tone. The exercise can be considered a useful strategy when study.
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