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The EVH test requires the subject to ventilate dry air containing \u223c5% CO<jats:sub>2<\/jats:sub>for 6 min through a low-resistance circuit at a rate higher than that usually achieved on maximum exercise. A \u226510% reduction in FEV<jats:sub>1<\/jats:sub>is a positive response to exercise and EVH and, when sustained, is usually associated with release of inflammatory mediators of broncho constriction. Another surrogate, mannitol dry powder, given by inhalation in progressively increasing doses, is used to mimic the dehydrating stimulus of exercise hyperpnoea. A positive mannitol test is a 15% fall in FEV<jats:sub>1<\/jats:sub>at \u2264635 mg and reveals potential for EIB. Mannitol has a high specificity for identifying a clinical diagnosis of asthma. Once a diagnosis of EIB is established, the athlete needs to know how to avoid EIB. Being treated daily with an inhaled corticosteroid to reduce airway inflammation, inhaling a \u03b2<jats:sub>2<\/jats:sub>agonist or a cromone immediately before exercise, or taking a leukotriene antagonist several hours before exercise, all inhibit or prevent EIB. 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