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Related Experiment Videos

Ventilatory variables in normal children during rest and exercise.

M Rosenthal1, A Bush

  • 1Dept of Paediatric Respiratory Medicine, The Royal Brompton Hospital, London, UK.

The European Respiratory Journal
|April 9, 2001
PubMed
Summary
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This study describes normal breathing in children during rest and exercise, finding surface area best for body size correction but explaining less than 37% of variance. Data aids comparison with disease groups.

Area of Science:

  • Pediatric physiology
  • Exercise science
  • Respiratory medicine

Background:

  • Understanding normal ventilation in children is crucial for interpreting exercise responses.
  • Body size significantly influences physiological parameters, necessitating appropriate scaling methods.
  • Previous studies have not fully characterized ventilation across a range of exercise intensities in pediatric populations.

Purpose of the Study:

  • To comprehensively describe normal ventilation at rest and during exercise in children.
  • To identify the most effective method for correcting ventilation data for body size.
  • To establish a baseline for comparing exercise responses in healthy children with those in disease states.

Main Methods:

  • One hundred and six children (aged 8-17 years) performed incremental bicycle exercise tests to exhaustion.

Related Experiment Videos

  • Ventilation and gas exchange were measured using helium dilution and mass spectrometry (AMIS 2000).
  • Data were analyzed at rest, various workloads, and maximal exercise, with corrections for body size.

    • Main Results:

    • Body surface area was the best single predictor for body size correction, though it explained less than 37% of the variance.
    • Resting oxygen consumption, corrected for surface area, was higher in males than females.
    • Exercise termination appeared linked to respiratory rates of 45 breaths/min (males) and 40 breaths/min (females) and rising alveolar oxygen.

    Conclusions:

    • Surface area is a useful, but imperfect, method for scaling ventilation in children.
    • The detailed dataset provides a valuable reference for pediatric exercise physiology research.
    • The findings facilitate comparisons between healthy children and those with respiratory or other diseases.