A 2006 study of youth athletes in Quebec City turned up the provocative finding that young, high-level swimmers wheezed and coughed far more often than young, indoor soccer players.

• 2006年一项关于魁北克市年轻运动员的研究调查惊人地发现，年轻的高水平游泳运动员喘息和咳嗽发作的次数要远远多于年轻的室内足球运动员。