30 Jul '14, 2am

Follow this advice to avoid cardiac arrest, hyponatremia, or heat stroke during a marathon: #RWMar…

Exercise associated hyponatremia occurs in 10-15 percent of runners based on studies out of the Boston and London Marathons but is symptomatic in an exceedingly small number of that group. In the marathon, this problem occurs when the combination of high water intake and low renal output produce a diluted blood serum sodium. This forces fluid to go into cells to keep the electrolyte balance equal in and out of the cells. When the cell swelling occurs in the brain, it is squeezed by the confines of the skull and the brain can push through the openings in the skull resulting in death. The mistake runners make is drinking too much water or sports drink along the course and after the finish. This is a rare problem if you are urinating freely, but during races it is common not to urinate. At Twin Cities Marathon, this problem is more frequent during our hotter races. Runners sh...

Full article: http://www.runnersworld.com/health/three-marathon-medical...

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