The QT interval during exercise in healthy children 6-14 years old.
Some children and adolescents with stress-induced syncope and a normal QT interval at rest are said to have a prolonged QT interval during exercise. Normal values for the QT interval of children during exercise, however, are lacking. Therefore, the authors determined, in 60 healthy boys aged 6-14 years, the QT interval during stepwise increase in exercise on a bicycle ergometer and constructed a graph containing, with a probability of 95%, at least 90% of normal QT intervals during exercise within its confidence limits. The QT interval as a function of heart rate during exercise can be expressed by the equation QT (s) = 0.4 - 9.18.10(-4) x heart rate (min-1) +/- 0.02.
Bucsenez
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D
Department of Cardiology, RWTH Aachen, Federal Republic of Germany.
von Bernuth
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G
D000293:Adolescent; D002648:Child; D004562:Electrocardiography; D006339:Heart Rate; D006801:Humans; D008297:Male; D005082:Physical Exertion; D012016:Reference Values