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Mohinder K. Thapar, MD; William B. Strong, MD; Max D. Miller, EdD; Linda Leatherbury, AB; Mansoor Salehbhai, MB

Am J Dis Child. 1978;132(6):592-595.

Abstract
• Exercise electrocardiography was performed on 170 healthy black children 7 to 14 years of age in order to determine the normal childhood electrocardiographic response to exercise. R-wave amplitude decreased from 27 ± 8 (SD) to 22 ± 8 mm (P <.01) and the S-wave amplitude increased from 6.9 ± 4.4 to 7.8 ± 5 mm (P <.01), indicating a shift of the mean QRS vector to the right at maximum exercise. J-point depression of 1.0 mm or greater was observed in 2.3% of children at maximum exercise, using the PR isoelectric line. ST-segment slope increased from 1.5 ± 0.7 to 4.3 ± 1.5 mV/sec at maximum. T-wave duration decreased with exercise and T-wave amplitude initially decreased with mild exercise but exceeded resting values at maximum exercise. No dysrhythmias were observed during or after the exercise study.

(Am J Dis Child 132:592-595, 1978)

Author Affiliations
From the Pediatric Physical Performance Laboratory, Section of Pediatric Cardiology, Department of Pediatrics, Medical College of Georgia, Augusta.

Footnotes
Reprint requests to Section of Pediatric Cardiology, Medical College of Georgia, Augusta, GA 30901 (Dr Strong).

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