What measure could reduce the likelihood of exercise-induced bronchospasm?

Engaging in a low- or variable-intensity warmup before running is effective in reducing the likelihood of exercise-induced bronchospasm (EIB) because it helps to gradually prepare the respiratory system for the demands of exercise. A proper warmup can promote bronchodilation, ease the transition from rest to exercise, and enhance overall airway responsiveness. This method allows the airways to adapt to increasing levels of exertion, potentially minimizing the risk of spasms or constrictions that could lead to breathing difficulties.

In contrast, rapidly increasing training speed can trigger bronchospasm as it places unexpected stress on the respiratory system, while exercising in cold weather without protective measures like a mask exposes the airways to cold, dry air that may prompt bronchoconstriction. Finally, inhaling deeply before running might not effectively prevent EIB and could sometimes lead to hyperventilation if not controlled properly. Therefore, the gradual and controlled approach of warming up is essential in managing exercise-related respiratory issues.