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Related Experiment Videos

Intraindividual peak flow variability

M J Hegewald1, R O Crapo, R L Jensen

  • 1Pulmonary Division, LDS Hospital, Salt Lake City.

Chest
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

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Peak expiratory flow (PEF) variability in healthy individuals is generally lower than previously reported. These findings help define statistically significant PEF changes for monitoring respiratory health.

Area of Science:

  • Pulmonary Function Testing
  • Respiratory Physiology

Background:

  • Peak expiratory flow (PEF) is a key measure of lung function.
  • Understanding intraindividual variability in PEF is crucial for accurate interpretation of test results.

Purpose of the Study:

  • To quantify intraindividual variability in PEF measurements using peak flow meters.
  • To identify factors influencing PEF variability in healthy subjects.

Main Methods:

  • Recruited 301 healthy subjects (ages 4-84) at sea level and 1,400m altitude.
  • Utilized a standardized peak flow meter and coaching for PEF maneuvers.
  • Assessed meter variability using a mechanical waveform simulator.

Main Results:

  • Mean PEF coefficient of variation (CV) was 4.6% (excluding outliers).

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  • Upper 95th percentile CV was 8% for adults and 10% for youths.
  • Meter variability accounted for only 5.5% of intraindividual variance.

    • Conclusions:

    • Intraindividual PEF variability estimates are lower than previously reported.
    • Meter variability has a minimal impact on overall PEF variability.
    • A fall of 6-8% (adults) or 9-10% (youths) in PEF may be statistically significant.