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Maximal static pressures in healthy children

C Gaultier, R Zinman

    Respiration Physiology
    |January 1, 1983
    PubMed

    Insights

    Maximal static pressures (Pmax) in children increase with age and are higher in males. Respiratory muscle force, calculated from pressure and surface area, grows disproportionately more than Pmax during development.

    Area of Science:

    • Pediatric Respiratory Physiology
    • Pulmonary Function Testing
    • Human Growth and Development

    Background:

    • Maximal static pressures (Pmax) are crucial indicators of respiratory muscle strength.
    • Understanding Pmax development in children is essential for assessing respiratory health.
    • Previous studies have focused on adult respiratory mechanics, with limited data on pediatric force development.

    Purpose of the Study:

    • To measure maximal static pressures (Pmax) at various lung volumes in school-aged children.
    • To investigate the relationship between Pmax, age, sex, and lung volume in pediatric subjects.
    • To derive and analyze net respiratory muscle force during growth, comparing it to Pmax changes.

    Main Methods:

    • Maximal static pressures (Pmax) were measured at the mouth in 119 Caucasian children (7-13 years).
    • Lung volumes (residual volume [RV], functional residual capacity [FRC], total lung capacity [TLC]) were determined by body plethysmography.
    • Respiratory muscle force was calculated using Pmax and estimated surface area (SA) derived from chest wall measurements and a truncated cone model.

    Main Results:

    • Inspiratory Pmax decreased with increasing lung volume, while expiratory Pmax increased, mirroring adult patterns.
    • Both inspiratory and expiratory Pmax increased with age and were greater in males than females.
    • Derived respiratory muscle force increased proportionally more with age than Pmax, indicating Pmax underestimates force changes during growth.

    Conclusions:

    • Maximal static pressures in children exhibit age and sex-related differences, influenced by lung volume.
    • Respiratory muscle force development during childhood is more pronounced than suggested by Pmax alone.
    • These findings highlight the importance of considering surface area in pediatric respiratory muscle strength assessments.

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