Abstract
The QTc interval which reflects ventricular activation/repolarization has not been characterized in children during exercise. We studied 60 children (ages 5-18 years) who underwent upright cycle ergometry according to a standard James protocol. These children were without known cardiac or medical problems. The QT interval was measured at rest (R); maximal exercise (MAX); immediate post exercise (IPE); and 1 (IPE1), 3 (IPE3) and 5 (IPE5) minutes post exercise. This interval was corrected for heart rate and QTc calculated with Bazett's formula. All patients demonstrated a normal QRS duration (<0.08 sec.). Patients were assigned to one of four groups on the basis of body surface area (BSA) and sex (M, F).
There were no significant differences in QTc interval on the basis of body size or sex at each level of exercise. In all out the smallest children, the QTc interval was longer at 5 min. post exercise than at rest. This suggests that there is a modest prolongation of ventricular repolarization following exercise which is an integral part of a normal exercise response.
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Cyran, S., Mays, W., James, F. et al. CHARACTERIZATION OF THE QT INTERVAL DURING UPRIGHT EXERCISE IN CHILDREN. Pediatr Res 21 (Suppl 4), 188 (1987). https://doi.org/10.1203/00006450-198704010-00134
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DOI: https://doi.org/10.1203/00006450-198704010-00134