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3-min step test and treadmill exercise for evaluating exercise-induced asthma.

G Tancredi1, S Quattrucci, F Scalercio

  • 1Paediatric Department, Cystic Fibrosis Centre, University of Rome La Sapienza, Viale Regina Elena, 324-00161 Rome, Italy. giancarlo.tancredi@uniroma1.it

The European Respiratory Journal
|April 16, 2004
PubMed
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The 3-minute step test is a viable alternative for detecting exercise-induced asthma in children, offering a simpler, more accessible method than treadmill testing. It effectively identifies asthma triggers without being influenced by baseline lung function or activity levels.

Area of Science:

  • Pediatric Pulmonology
  • Exercise Physiology
  • Asthma Research

Background:

  • Exercise-induced asthma (EIA) is a common condition in children with asthma.
  • Accurate detection of EIA is crucial for effective management and treatment.
  • Current diagnostic methods may have limitations in accessibility and practicality.

Purpose of the Study:

  • To compare the efficacy of a simple 3-minute step test against treadmill exercise for detecting EIA in asthmatic children.
  • To assess the influence of baseline lung function and habitual physical activity on EIA responses to both tests.

Main Methods:

  • 154 asthmatic children (mean age 12.9 years) underwent both a 3-minute step test and treadmill testing on separate occasions.
  • Spirometry was performed before and after each exercise challenge to measure forced expiratory volume in one second (FEV1).

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  • Key metrics included the percentage fall in FEV1 and the area above the FEV1 curve (AAC0-30 min).

    • Main Results:

    • Treadmill exercise induced a significantly greater percentage fall in FEV1 and a larger AAC0-30 min compared to the 3-minute step test.
    • No significant correlation was found between EIA severity (% fall in FEV1) and baseline lung function (FEV1).
    • Habitual physical activity levels did not influence the EIA response to either the step test or treadmill exercise.

    Conclusions:

    • The 3-minute step test is a quick, economical, reproducible, and portable alternative for identifying exercise-induced asthma in pediatric outpatients and epidemiological studies.
    • Despite eliciting a lesser response, the step test provides a valuable method for EIA detection.
    • Baseline lung function and habitual physical activity do not impact the manifestation or severity of exercise-induced asthma.