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Article |

Oxygen Consumption During Recovery From Exercise in Children With Congenital Heart Disease

Andrew C. Drakonakis, MD; Katherine H. Halloran, MD
Am J Dis Child. 1974;128(5):651-656. doi:10.1001/archpedi.1974.02110300061008.
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Recovery curves of oxygen uptake, following submaximal exercise, were studied in normal children and children with acyanotic and cyanotic congenital heart disease.

Oxygen uptake in normal children and patients with acyanotic heart disease returned rapidly to resting level following exercise. In cyanotic children, O2 uptake, following exercise, was greater at comparable work loads and returned to resting levels more slowly. The ventilation required to achieve a given O2 uptake was significantly greater than that in normal children, while heart rate was not as high as expected for the degree of their exhaustion.

The findings suggest that cyanotic children had a decreased efficiency of ventilation, exercised at a relatively greater percentage of their maximal working capacity, and had a noticeably decreased aerobic capacity compared to normal children or those with acyanotic heart disease.


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The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
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