When an athlete reaches the podium despite a prior medical event—a cancer diagnosis, say, or a car accident—we consider it a triumph of the human spirit. When a bunch of athletes do so, and all of them have suffered the same setback, we can be forgiven for wondering what’s going on. According to the International Olympic Committee, roughly one in five competitive athletes suffers from exercise-induced bronchoconstriction, or EIB, an asthma-like narrowing of the airways triggered by strenuous exercise. The numbers are even higher in endurance and winter sports. Puzzlingly, studies have found that athletes with EIB who somehow make it to the Olympics are more likely to medal. What’s so great about wheezing, chest tightness, and breathlessness?
The answer isn’t what you’re thinking. Sure, it’s possible that some athletes get a boost because an EIB diagnosis allows them to use otherwise-banned asthma medications. But there’s a simpler explanation: breathing high volumes of cold or polluted air dries out the airways, leading to an overzealous immune response and potential long-term damage. “It’s well established that high training loads and ventilatory work increase the degree of airway hyper-responsiveness and hence development of asthma and EIB,” explains…
