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Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults
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Exercise-Induced Bronchoconstriction Identified Using the Forced Oscillation Technique.

Leigh M Seccombe1,2, Matthew J Peters1,2, Lachlan Buddle1

  • 1Thoracic Medicine, Concord Hospital, Sydney, NSW, Australia.

Frontiers in Physiology
|December 6, 2019
PubMed
Summary
This summary is machine-generated.

The forced oscillation technique (FOT) effectively identifies exercise-induced bronchoconstriction (EIB) in asthma patients, showing comparable sensitivity to spirometry. Increased ventilation after exercise did not impact FOT measurements, confirming its reliability.

Keywords:
airway reactanceairway resistanceasthmaexercise-induced bronchoconstrictionrespiratory function

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Area of Science:

  • Respiratory Physiology
  • Pulmonary Function Testing

Background:

  • Exercise-induced bronchoconstriction (EIB) is a common condition in asthma.
  • Spirometry is the standard method for diagnosing EIB, but the forced oscillation technique (FOT) may offer greater sensitivity.
  • The influence of dynamic changes in ventilation on FOT measurements post-exercise is not fully understood.

Purpose of the Study:

  • To compare the efficacy of FOT parameters with spirometry in detecting EIB after an exercise challenge.
  • To assess the recovery rate of FOT parameters post-exercise.
  • To investigate the impact of elevated minute ventilation (VE) on FOT measurements following exercise.

Main Methods:

  • Participants with asthma and healthy controls underwent a standardized exercise challenge.
  • Forced oscillation technique (airway resistance R5 and reactance X5) and spirometry (forced expiratory volume in 1 s, FEV1) were measured before and up to 20 minutes after exercise.
  • Airway hyperresponsiveness was assessed using the mannitol test in asthmatic subjects.

Main Results:

  • FOT parameters (R5 and X5) changes post-exercise correlated strongly with FEV1 changes, particularly in asthma patients who met spirometric criteria for EIB.
  • While R5 recovery mirrored FEV1, X5 recovery was significantly higher (p=0.03).
  • Elevated VE post-exercise did not affect the percentage change in FOT parameters (p>0.3). FOT demonstrated high sensitivity (80-86%) and specificity (X5: 93%) for detecting EIB.

Conclusions:

  • FOT parameters accurately reflect lung mechanics changes during EIB testing and are not confounded by post-exercise hyperventilation.
  • FOT is a sensitive and specific tool for identifying EIB in asthma patients, comparable to spirometry.
  • FOT offers a reliable alternative or adjunct to spirometry for assessing exercise-induced airway narrowing.