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Evidence of exercise-induced arterial hypoxemia in prepubescent trained children

Cédric Nourry1, Claudine Fabre, Frédéric Bart

  • 1UFR STAPS Liévin, Laboratoire d'Analyse Multidisciplinaire des Pratiques et Sportives, Chemin du Marquage, 62800 Liévin, France.

Pediatric Research
|January 24, 2004
PubMed

Insights

Exercise-induced arterial hypoxemia (EIAH) can occur in young athletes. This study found EIAH in 7 of 24 trained children, suggesting it

Area of Science:

  • Pediatric Exercise Physiology
  • Sports Medicine
  • Respiratory Physiology

Background:

  • Exercise-induced arterial hypoxemia (EIAH) is documented in highly trained adults.
  • Prepubescent children have high metabolic demands but limited lung capacity compared to adults.
  • The presence of EIAH in young athletes requires investigation.

Purpose of the Study:

  • To investigate the occurrence of exercise-induced arterial hypoxemia (EIAH) in trained prepubescent children.
  • To identify potential physiological factors associated with EIAH in this age group.

Main Methods:

  • Twenty-four trained prepubescent children (age 10.3 ± 0.2 years) underwent pulmonary function tests.
  • A graded maximal exercise test on a cycle ergometer was performed.
  • EIAH was defined as a ≥4% drop in arterial oxygen saturation (Sao2) from resting levels, measured via pulse oximetry.

Main Results:

  • EIAH was observed in 7 out of 24 children.
  • Hypoxemic children had significantly lower forced vital capacity (FVC), ventilatory response to exercise (ΔE/ΔCO2), and breathing reserve.
  • Tidal volume relative to FVC was higher in hypoxemic children; weekly activity and maximal oxygen uptake were similar between groups.

Conclusions:

  • Exercise-induced arterial hypoxemia (EIAH) can occur in trained prepubescent children, even with relatively low maximal oxygen uptake.
  • Physiological differences in lung function and breathing mechanics may be associated with EIAH in this population.
  • Further research is needed to elucidate the underlying mechanisms of EIAH in young athletes.

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