Word: hyponatremia
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Dates: during 2005-2005
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...Staying hydrated while exercising is important, but drinking too much water can be as dangerous as not drinking enough. Research showed that hydrating too much over the long haul--during a marathon, say, or a long-distance bike ride--dilutes the blood's salt content and can lead to hyponatremia. The body's cells, including brain cells, absorb the excess fluid and swell, and growing pressure in the skull can cause permanent damage or death. Hyponatremia is surprisingly common; in a study of 488 runners of the 2002 Boston Marathon, 13% were over-hydrated. Many of the symptoms of hyponatremia...
...researchers found that 13 percent suffered from hyponatremia, a condition characterized by excess water in the blood, which causes sodium levels to fall. Water then moves to areas of higher sodium content in the body, causing cells to swell...
Critical cases of hyponatremia occurred in .6 percent of the sample, or three runners. The most common risk factors were significant weight gain during the race, longer race times, and a lower body-mass index, Almond said...
...prevent hyponatremia and dehydration, Almond advised that runners should weigh themselves before and after training periods to check for fluctuations in weight. Gaining significant amounts of weight may signal excessive water intake, while losing too much weight after a workout might point to inadequate hydration, he said...
Almond said the researchers first became interested in hyponatremia after treating a teenager who collapsed after a race...