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I live in South Dakota where the winter days can be frigid and very dry. Many people, including me, have difficulty breathing while exercising in the winter because our airways temporarily narrow during exercise. This condition is called exercise-induced bronchoconstriction (EIB), formerly known as exercise-induced asthma, and it’s often triggered by working out in cold, dry air.
Scientists believe it’s the dryness of the air breathed in and the quality of the air, not the coldness, that cause the airways to narrow. The lungs have a number of defense mechanisms and reflexes to protect the small airspaces from dry air and particles in the air. The extensive network of airways moistens and warms inhaled air so that by the time the air arrives at the gas-exchange areas—where oxygen enters the blood and carbon dioxide leaves—it is humidified and the same temperature as the body. The airways are…
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