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Normal values for maximal static inspiratory and expiratory pressures in healthy children

Waldemar Tomalak1, Andrzej Pogorzelski, Jarosław Prusak

  • 1Paediatric Division, National Institute for Tuberculosis and Lung Diseases, Rabka, Poland. wtomalak@zpigichp.edu.pl

Pediatric Pulmonology
|July 12, 2002
PubMed

Insights

Maximal static respiratory pressures, measuring inspiratory (P(Imax)) and expiratory (P(Emax)) muscle strength, were assessed in children. Boys exhibited significantly higher pressures than girls, with age correlating to strength, particularly in boys.

Area of Science:

  • Pediatric Pulmonology
  • Respiratory Physiology
  • Biomedical Engineering

Background:

  • Maximal static respiratory pressures are key indicators of respiratory muscle strength.
  • Establishing normative values is crucial for clinical assessment in pediatric populations.
  • Previous research has indicated potential sex-based differences in respiratory function.

Purpose of the Study:

  • To establish reference equations for maximal static respiratory pressures in children aged 7-14 years.
  • To investigate the influence of sex and body position on maximal inspiratory (P(Imax)) and expiratory (P(Emax)) pressures.
  • To explore the correlation between respiratory pressures and age, as well as maximal respiratory flows.

Main Methods:

  • Measurements of P(Imax) and P(Emax) were conducted in 296 children (144 boys, 152 girls) aged 7-14 years.
  • Participants were assessed in both sitting and standing positions.
  • Statistical analyses included comparisons between sexes and positions, and correlation analyses with age and respiratory flows.

Main Results:

  • Boys demonstrated significantly higher P(Imax) and P(Emax) values compared to girls (P < 0.001).
  • No significant differences in pressures were observed based on body position (sitting vs. standing).
  • Age showed significant correlations with pressures in boys, and P(Imax) in girls (standing).
  • Maximal respiratory pressures correlated with maximal inspiratory and expiratory flows.

Conclusions:

  • Reference equations for maximal static respiratory pressures in children can be developed using age as a primary variable.
  • Sex is a significant determinant of respiratory muscle strength in children, with boys generally exhibiting greater strength.
  • These measurements provide a valuable, albeit variable, tool for assessing respiratory muscle strength in pediatric populations.
  • Children's respiratory pressures and maximal flows are lower than those observed in adolescents and adults.

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