Wednesday 1 July 2015 17:25, UK
Dr John Dickinson discusses the prevalence of asthma among elite athletes following Mo Farah's revelation he has suffered from the condition since childhood.
In an exclusive interview with Sky Sports' Jim White, the double Olympic champion, said the only medication he regularly uses is to control the disease which causes inflammation and narrowing of the airways.
Now Sky Sports News HQ has obtained figures which show 21 to 25 per cent of top performers suffer from the condition, compared to 9 or 10 per cent within the general population.
Sir Bradley Wiggins, David Beckham and Paula Radcliffe are among a large number of high-profile asthma sufferers.
Click on the video to hear Dr Dickinson discuss exercise-induced asthma among British athletes.
