Word: hyponatremia
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...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...