As we hit marathon season, Peter Brukner, BJSM senior associate editor, discusses the controversy around hydration for athletes with Tim Noakes, professor of exercise and sports science at the University of Cape Town and author of ‘Waterlogged: The Serious Problem of Overhydration in Endurance Sports’. Professor Noakes explains who is at risk of hyponatremia, and how to spot and treat the condition. He lays out the advice sports physicians should be giving athletes. He also describes how commercial messages led to athletes thinking they need to drink more than they should. See also: Waterlogged: The Serious Problem of Overhydration in Endurance Sports http://bit.ly/12avAeV Case proven: exercise associated hyponatraemia is due to overdrinking. So why did it take 20 years before the original evidence was accepted? http://bit.ly/17UF9SM The truth about sports drinks http://bit.ly/NB379z

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