31 Jan '13, 12am

Dangerous exercise: The hype of dehydration & heat-stroke

A 17-year old army trainee develops heatstroke (40C) after only 15 min of fast walking at only 8min/km. The air temperature? Only 17C. One hour after admission, his body temperature has climbed to 42.8C, while he remains unconscious (Parnell, 1986 ) Runner collapses with a body temperature of 42C only 45 min into a 10km fun run at a moderate temperature of 24C. This study documented what were described as 15 cases of heat problems, ranging from mild to serious, out of a field of 13,000, and it wasn't even particularly warm. Only one was true heatstroke, however, the others were just feeling hotter than usual because they were unacclimatized to the conditions, and this is often confused for 'heat illness' - there's a big difference between feeling hot, and being hot, and training status affects that more than anything (Hughson, 1978 )

Full article: http://www.sportsscientists.com/2013/01/dangerous-exercis...