What is a common trigger for exercise-induced bronchospasm?

Exercise-induced bronchospasm (EIB) is a common phenomenon that can occur during or after physical activity, particularly in individuals with asthma or other respiratory conditions. Cold air, specifically, is well-known to trigger EIB. When a person breathes in cold air during exercise, it can lead to bronchial constriction, decreased airway diameter, and increased respiratory resistance, culminating in symptoms such as wheezing, coughing, and shortness of breath.

The mechanism behind this involves the cooling and drying of the airway, which can provoke a response from the bronchial tissues, causing inflammation and narrowing of the airways. Therefore, exposure to cold air during vigorous activity can significantly impact respiratory function for those susceptible to EIB.

In contrast, while warm, humid air, high pollen counts, and indoor allergens can also contribute to asthma symptoms or respiratory issues, they do not specifically induce bronchospasm in the same immediate way that cold air does during exercise. Warm, humid air may actually be less likely to provoke EIB in some individuals, as it can help keep the airways moistened. High pollen counts and indoor allergens are typically more related to allergic reactions or asthma flare-ups rather than the direct physiological response triggered by cold air during exercise.