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Reference values of sniff nasal inspiratory pressure in healthy children

Ana A Marcelino1,2, Guilherme A Fregonezi1,2, Maria G A Lira1,2

  • 1PneumoCardioVascular Lab, Hospital Universitário Onofre Lopes (HUOL), Empresa Brasileira de Serviços Hospitalares (EBSERH), Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil.

Pediatric Pulmonology
|November 30, 2019
PubMed

Insights

This study established sniff nasal inspiratory pressure (SNIP) reference values for healthy children aged 6-11. Body mass index (BMI) percentile positively correlated with inspiratory muscle strength in girls, but not boys.

Area of Science:

  • Pediatric Pulmonology
  • Respiratory Physiology

Background:

  • Establishing normative data for respiratory muscle strength is crucial for pediatric respiratory health assessment.
  • Sniff nasal inspiratory pressure (SNIP) is a non-invasive measure of inspiratory muscle strength.
  • Previous research has not fully elucidated SNIP reference values in healthy children within a specific age range.

Purpose of the Study:

  • To determine reference values for sniff nasal inspiratory pressure (SNIP) in healthy children aged 6 to 11 years.
  • To compare SNIP measurements between sexes and correlate them with anthropometric data.
  • To establish lower limits of normal for SNIP in the pediatric population.

Main Methods:

  • A cross-sectional observational study involving 121 healthy children aged 6-11 years.
  • Pulmonary function tests were conducted to exclude respiratory disorders.
  • Respiratory muscle strength was assessed using maximal inspiratory pressure (MIP), maximal expiratory pressure (MEP), and SNIP near functional residual capacity (FRC).

Main Results:

  • SNIP values were comparable between boys and girls (87.7 ± 19.4 cmH2O vs. 91.1 ± 21.0 cmH2O, respectively).
  • Mean lower limits of normal for SNIP were similar for both sexes (approx. 56.7 cmH2O).
  • A positive correlation was observed between SNIP and BMI percentile in girls (r=0.25, P=0.04), but not in boys.

Conclusions:

  • Reference values and mean lower limits of normal for SNIP were successfully defined for healthy children aged 6-11.
  • Body mass index percentile appears to positively influence inspiratory muscle strength, as measured by SNIP, specifically in girls.
  • These findings contribute valuable normative data for assessing inspiratory muscle function in children.
Abstract

Keywords:
muscle strengthrespiratory function testsrespiratory muscles

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