Effects of simulated altitude and exercise upon ECGs of young black men

Evaluation of Exercise‐Induced T Wave Changes in Patients with Idiopathic Dilated Cardiomyopathy Before and After Beta‐Blocker Therapy

“…There are several reports concerning changes in T wave morphology after exercise in normal subjects 7–9 . Langley et al reported that T waves in V2 showed a nonsymmetrical shape in the resting ECG (i.e., a longer and more gradual ascending limb and a shorter and steeper descending limb), but changed into a more symmetrical shape after exercise by moving the T wave apex forward with an increase in TA 7 .…”

“…Life‐threatening ventricular arrhythmias occur especially in the morning hours in DCM patients 4 and, therefore, abnormal adaptation of ventricular repolarization to changes in autonomic tone has been a concern 5,6 . In normal subjects, physical or mental stress alters T wave morphology 7–11 . Exercise stress increases T wave amplitude (TA), moving the ascending part or apex of the T wave forward in the QT interval, 7,8 and changing the T wave shape from nonsymmetrical to symmetrical 7 .…”