Evaluation of factors affecting peak expiratory flow in healthy adults: is it necessary to stand up?

J Asthma. 2005 Nov;42(9):793-4. doi: 10.1080/02770900500308528.


Background: Guidelines for the Diagnoses and Management of Asthma recommend that the peak flow meter should be used in a standing position.

Objective: To determine whether the peak expiratory flow (PEF) varies with the position of the subject and to evaluate the impact of application of nose clip on PEF measurement.

Methods: Using a Mini Wright Peak Flow Meter, the PEF was measured in 33 healthy adults in sitting and standing positions, with and without application of a nose clip. Each subject blew into the peak flow meter three times and best of the 3 blows was recorded.

Results: The PEF was not significantly higher in standing than in sitting position. Application of nose clip had no significant impact on the PEF.

Conclusion: The position of the subject and application of nose clip has no significant impact on PEF measurement.

MeSH terms

  • Adolescent
  • Adult
  • Female
  • Humans
  • Male
  • Middle Aged
  • Peak Expiratory Flow Rate / physiology*
  • Posture / physiology*
  • Risk Factors