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Development of Ventilatory Responses to Exercise in Normal White Children : A Longitudinal Study

Thomas W. Rowland; Lee N. Cunningham
Author and Funding Information

From the Department of Pediatrics, Baystate Medical Center, Springfield, Mass; the Department of Physical Education, Fitchburg State College, Fitchburg, Mass


1997 by the American College of Chest Physicians


Chest. 1997;111(2):327-332. doi:10.1378/chest.111.2.327
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Abstract

Cross-sectional studies have indicated that the pattern of ventilatory responses to exercise evolves during the course of childhood. This 5-year study was designed to provide a longitudinal assessment of minute ventilation (VE), tidal volume (VT), and breathing frequency (fR) in 20 children (11 girls, nine boys) between the ages of 9 and 13 years. Subjects performed maximal and identical submaximal steady-state treadmill walking tests annually. No significant gender differences were observed in any of the three variables. At submaximal exercise, VT per kilogram remained stable, with a progressive fall in fR. As a result, submaximal VE per kilogram declined with age. A similar pattern was observed at maximal exercise, but the decrease in VE per kilogram was not statistically significant. Ventilatory equivalent for oxygen (VE/VO2) fell with age at submaximal exercise but declined only in the boys with maximal testing. VE/VO2 at maximal and submaximal exercise was greater in the girls at all ages. These findings support previous data derived from cross-sectional studies.


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exercise

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