UNASSIGNED: Training-induced electrocardiographic changes are common in adult @entity2587 . However, a few data are available on electrocardiogram (ECG) in preadolescent @entity2587 and little is known about the potential changes induced by training on 12-lead electrocardiogram (ECG) at rest. Twelve-lead ECGs at rest and complete echocardiographic examinations were performed in 94 @entity1 (57 endurance @entity2587 , 37 sedentary controls; mean age 10.8    0.2 and 10.2    0.2  years, respectively) at baseline and after 5  months of growth and training in @entity2587 and of natural growth in controls. At baseline, @entity2587 had lower heart rate at rest compared with controls (p  = 0.046) and a further decrease was observed after training (p <0.0001). An incomplete @entity714 was found in 19% of @entity2587 and 15% of controls (p  = 0.69) with no changes after training. Although none of the @entity2587 showed negative T waves from V1 to V3, 6% of controls at baseline had T-wave inversion V1 to V3 with a decrease to 3% after 5  months (p  = 0.16). The early repolarization pattern did not differ between @entity2587 and controls and was correlated with Tanner's scale score in the overall population both at first and second evaluation (R  = 0.30, R  = 0.27, p  = 0.005, p  = 0.012, respectively). No correlations were found between ECG and echocardiographic data. In conclusion, 12-lead ECG at rest is not substantially affected by training in @entity1 , despite a physiological increase in cavity size. Thus, in preadolescent @entity2587 , 12-lead ECG at rest does not reflect exercise-induced morphologic @entity5707 and seems to be influenced more by sexual maturation than by training.

Electrocardiographic Changes Induced by Endurance Training and Pubertal Development in Male XXXX .

@entity2587 :: ('MESH:D001265', 'Disease') :: ['athletes'] @entity1 :: ('9606', 'Species') :: ['children'] @entity5707 :: ('MESH:D020257', 'Disease') :: ['remodeling'] @entity714 :: ('MESH:D002037', 'Disease') :: ['right bundle branch block']
@entity1 :: (9606,Species) :: ['Children']
