Deconditioning of exercise-induced asthma

Area of Science:

• Pediatric Pulmonology
• Behavioral Medicine
• Allergy and Immunology

Background:

• Exercise-induced bronchospasm (EIB) is common in asthmatic children, but its etiology is unclear.
• Standard pulmonary function tests, blood gases, and immunological assessments are typically normal in these cases.
• This suggests a potential role for conditioning in the development of EIB.

Purpose of the Study:

• To investigate the role of classical conditioning in the development of exercise-induced bronchospasm (EIB) in asthmatic children.
• To evaluate the efficacy of a classical extinction procedure for treating EIB.
• To assess the long-term maintenance of treatment gains.

Main Methods:

• Fifty asthmatic children (ages 8-15) underwent standardized exercise testing.
• Thirty-six children who developed EIB were divided into experimental and control groups.
• The experimental group received isoproterenol before exercise (extinction trial), while the control group received a placebo (air).

Main Results:

• The experimental group receiving isoproterenol demonstrated a significant reduction in EIB following the extinction procedure.
• A 6-month follow-up revealed that most children in the experimental group maintained their improved condition.
• This suggests that EIB may have a conditioned component responsive to behavioral intervention.

Conclusions:

• The findings support the hypothesis that conditioning plays a role in exercise-induced bronchospasm in asthmatic children.
• A classical extinction procedure, utilizing isoproterenol to block the response, can effectively treat EIB.
• This approach offers a novel therapeutic strategy for managing EIB in pediatric populations.