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Exercise flow-volume loops in prepubescent aerobically trained children.

Cédric Nourry1, Fabien Deruelle, Claudine Fabre

  • 1Laboratoire d'Analyse Multidisciplinaire des Pratiques Sportives, Unité de Formation et de Recherche des Sciences et Techniques des Activités Physiques et Sportives de Liévin, Université d'Artois, Chemin du Marquage, Liévin, France. nourryce@wanadoo.fr

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 9, 2005
PubMed
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Aerobically trained children experience greater ventilatory constraints during strenuous exercise compared to untrained children. This can lead to increased shortness of breath and lower oxygen saturation levels in trained individuals.

Area of Science:

  • Pediatric exercise physiology
  • Respiratory mechanics
  • Sports science

Background:

  • Understanding mechanical ventilatory constraints is crucial for evaluating exercise performance in children.
  • Aerobic training influences respiratory function, but its impact on ventilatory constraints during exercise in prepubescent children is not fully understood.

Purpose of the Study:

  • To investigate and compare mechanical ventilatory constraints during maximal exercise between aerobically trained and untrained prepubescent children.
  • To analyze differences in breathing patterns, expiratory flow limitation, and associated physiological responses.

Main Methods:

  • Exercise flow-volume loops were plotted within maximal flow-volume loops in 13 trained (Tr) and 11 untrained (UT) prepubescent children.
  • Measurements included forced vital capacity (FVC), maximal expiratory flows, expiratory/inspiratory reserve volumes, breathing reserve (BR), and expiratory flow limitation (expFL).

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Main Results:

  • Trained children exhibited higher resting FVC and maximal expiratory flows than untrained children.
  • Both groups showed expiratory flow limitation, with no significant difference in its prevalence or magnitude.
  • Trained children experienced higher ventilation (VE), dyspnea, and lower BR and SaO2 at peak exercise.

Conclusions:

  • Despite similar expiratory flow limitation, trained prepubescent children face greater ventilatory constraints due to higher ventilation levels.
  • These constraints may negatively impact oxygen saturation and perceived exertion during strenuous exercise in trained children.