What is indicative of a diagnosis of exercise-induced asthma based on PEF or Fev1 tests?

A 15% decrease in peak expiratory flow (PEF) or forced expiratory volume in one second (FEV1) after exercise is indicative of a diagnosis of exercise-induced asthma. This threshold is recognized in clinical practice as it reflects a significant narrowing of the airways that can occur due to physical exertion, particularly in individuals susceptible to asthma.

This reduction in lung function can be attributed to bronchoconstriction triggered by exercise, which may be exacerbated by environmental factors such as cold air or allergens. A 15% decrease is clinically significant enough to warrant further evaluation and intervention, as it supports the diagnosis and emphasizes the need for management strategies to help patients cope with their symptoms during physical activity.

Understanding this parameter is crucial for asthma educators and healthcare professionals, as they can guide those affected in recognizing their triggers and implementing effective treatment plans.