Korean J Asthma Allergy Clin Immunol.  2008 Dec;28(4):271-276.

Short-Term Variations in Impulse Oscillation System Parameters

Abstract

BACKGROUND: The impulse oscillation system (IOS) is known to be more useful than spirometry for the evaluation of pulmonary function.
OBJECTIVE
The aim of this study was to compare short-term variations in spirometry and IOS parameters in healthy adults. METHOD: Spirometry and IOS parameters were measured in 12 healthy adults. Their mean age was 28.7+/-3.64 years; there were 6 males and 6 females. The differences in the mean values at various time intervals were tested with repeated-measures analysis of variance (ANOVA). The coefficients of repeatability and variation were calculated for assessing the repeatability and variability. RESULT: There were no statistically significant differences in the mean values of the spirometric parameters, FEV1, FVC, FEV1/FVC, FEV0.5, and PEF, and the IOS parameters, X5 and R20. In spirometry, the coefficient of repeatability on the first day was the smallest for FVC, FEV1/FVC, and MMEF. However, when IOS was used, it was the smallest only for Rf. The coefficient of variation in spirometry was the smallest for FEV1/FVC, and that in IOS was the smallest for R5 and X5.
CONCLUSION
The variation in IOS values is larger than that in most of the spirometry parameters. X5 is the smallest coefficient of variations and statistically significant among the IOS parameters.

MeSH Terms

Adult
Female
Humans
Male
Spirometry