The morphological and functional cardiac adaptations induced by physical training may be reflected in several athlete's electrocardiographic variants. Rhythm and heart rate disturbances are the most common findings, and sinus @entity1168 is the most frequent adaptation. Non-specific @entity18893 and @entity714 are also frequent, but other bundle branch and @entity714 are extremely rare. While the atrioventricular conduction may be prolonged, the occurrence of first degree and type I second degree @entity713 depends on the individual's susceptibility. Advanced second and third degree @entity713 are exceptional, and when present, the possibility of underlying @entity299 must be excluded. High QRS voltage is more frequent in male athletes, but its correlation with @entity4346 is low. The ST segment elevation in the so called "early repolarization" pattern is typical of the athlete's electrocardiogram. Vagotonic or high T wave voltages and U waves are also frequent when sinus @entity1168 is present. @entity591 and increased automatism @entity943 are rare and usually benign. The increased vagal tone is responsible for the suppression of the physiological and ectopic pacemakers. While @entity3153 per se does not exclude an athlete from sports activity, the risk of a @entity944 makes it mandatory to perform an exhaustive cardiac evaluation. We may conclude that no sport can be considered arrhythmogenic or as a predisposing factor for malignant @entity943 .

["The XXXX ": most common electrocardiographic findings].

@entity18893 :: ('MESH:C535853', 'Disease') :: ['intraventricular conduction delay'] @entity714 :: ('MESH:D002037', 'Disease') :: ['incomplete right bundle branch block', 'fascicular blocks'] @entity713 :: ('MESH:D054537', 'Disease') :: ['atrioventricular blocks'] @entity944 :: ('MESH:D003645', 'Disease') :: ['sudden death'] @entity591 :: ('MESH:D013610', 'Disease') :: ['Tachyarrhythmias'] @entity4346 :: ('MESH:D017379', 'Disease') :: ['left ventricular hypertrophy'] @entity299 :: ('MESH:D006331', 'Disease') :: ['heart disease'] @entity3153 :: ('MESH:D014927', 'Disease') :: ['Wolff-Parkinson-White syndrome'] @entity943 :: ('MESH:D001145', 'Disease') :: ['ventricular arrhythmias', 'arrhythmias'] @entity1168 :: ('MESH:D001919', 'Disease') :: ['bradycardia']
@entity299 :: (MESH:D006331,Disease) :: ['athlete's heart']
