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Related Experiment Videos

Exercise-induced bronchoconstriction depends on exercise load.

K H Carlsen1, G Engh, M Mørk

  • 1Voksentoppen Center of Asthma and Allergy and Chronic Lung Diseases in children and Voksentoppen Research Institute for Paediatric Allergy, Pulmonology and Milieu, Oslo, Norway. kaic@usit-dv.uio.no

Respiratory Medicine
|August 24, 2000
PubMed
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Higher exercise intensity during testing significantly increases the likelihood and severity of exercise-induced bronchoconstriction (EIB) in children with asthma. Standardizing exercise load is crucial for accurate EIB assessment and understanding inflammatory markers.

Area of Science:

  • Pediatric Pulmonology
  • Exercise Physiology
  • Asthma Research

Background:

  • Exercise-induced bronchoconstriction (EIB) is a key indicator of bronchial hyperresponsiveness.
  • Current epidemiological studies often lack standardized exercise protocols, impacting EIB assessment.
  • The influence of exercise intensity on EIB severity requires further investigation.

Purpose of the Study:

  • To evaluate the impact of varying exercise loads on the manifestation and severity of EIB in asthmatic children.
  • To determine the relationship between exercise intensity and bronchial hyperresponsiveness.
  • To explore the correlation between EIB severity and inflammatory markers at different exercise loads.

Main Methods:

  • Twenty children (9-17 years) with asthma and a history of EIB performed two standardized treadmill tests at 85% and 95% of their calculated maximum heart rate.

Related Experiment Videos

  • Lung function (FEV1) was measured pre- and post-exercise at multiple time points.
  • Perceived exertion was assessed using the Borg scale.

    • Main Results:

    • The 95% exercise load resulted in significantly higher peak heart rates and Borg scores compared to the 85% load.
    • Maximum fall in FEV1 was significantly greater after the 95% load (25.11%) versus the 85% load (8.84%).
    • 100% of subjects exhibited a >=10% fall in FEV1 after 95% load, compared to 40% after 85% load. EIB severity correlated better with serum ECP at higher loads.

    Conclusions:

    • Exercise load is a critical factor in interpreting EIB results.
    • Standardization of exercise testing protocols is essential for reliable EIB assessment.
    • EIB identified through high-intensity exercise correlates more strongly with underlying inflammatory activity.