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Perception of dyspnea during exercise-induced bronchoconstriction
A S Melani1, G Ciarleglio, M Pirrelli
1Fisiopatologia Respiratoria, Policlinico Le Scotte, Azienda Ospedaliera Senese, Italy. a.melani@ao-siena.toscana.it
Respiratory Medicine
|March 21, 2003
Summary
Dyspnea perception after exercise is linked to real-life symptoms but not fully explained by exercise-induced bronchoconstriction (EIB). Rating dyspnea helps study exercise-induced shortness of breath.
Area of Science:
- Pulmonology
- Exercise Physiology
Background:
- Strenuous exercise can cause bronchoconstriction and dyspnea.
- Understanding the link between perceived dyspnea and exercise-induced bronchoconstriction (EIB) is crucial for managing associated disability.
Purpose of the Study:
- To investigate the relationship between perceived dyspnea and EIB following a standardized exercise challenge.
- To assess the utility of dyspnea ratings in studying exercise-induced respiratory symptoms.
Main Methods:
- Evaluated 200 outpatients (median age 13 years) suspected of EIB.
- Assessed dyspnea using a modified Borg scale before FEV1 measurements during an exercise challenge.
- Defined positive EIB as a ≥20% decrease in FEV1 from baseline.
Main Results:
- 35% of subjects (69/200) exhibited EIB.
- Dyspnea onset and resolution preceded bronchoconstriction.
- Dyspnea ratings correlated with reported exertional symptoms and were influenced by age, gender, and BMI, but only loosely with FEV1 decrease.
Conclusions:
- Laboratory-assessed dyspnea after exercise correlates with real-life exertional symptoms.
- Dyspnea perception is not entirely explained by EIB, suggesting other contributing factors.
- Dyspnea rating is a valuable tool for studying exercise-induced dyspnea and enhancing exercise challenge interpretations.