Sorry can't find a link but for you cyclists with AF it is worth buying this week. States much of what you might already know but gives a figure that athletes are five times more likely to develop AF. That means five to 10 athletes diagnosed for every single non athlete. This is of course for serious competitive athletes who push their body and heart very hard. Dr Ahmed Meghani a research fellow at St George's, University of London is quoted as an expert in this article on AF .amongst athletes.