See the July 2001 issue of Runner's World. There is an article by John Brant called "Drink This." On page 44, it says the following:
"Hyponatremia, or 'water intoxication,' usually happens only during long, hot runs, when a runner loses a lot of sodium through sweat and consumes a great deal of plain water. This combination may unwittingly dilute sodium levels in your blood, which sets off an electrolyte imbalance. Hyponatremia can trigger seizures, coma, and even death. Initial warning signs mimic those of dehydration, including confusion, disorientation, muscle weakness, and vomiting."
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