When 17-year-old Zyrees Oliver collapsed after a high school football practice last August, his friends and family likely did not guess that the cause wasn't the heat and humidity, but actually overhydraton. The medical term for this — drinking too much water — is hyponatremia, a condition that can be fatal in endurance athletes, and as recent incidents have shown, children participating in sports on hot summer days. Mitchell H. Rosner, M.D., a professor of medicine at the University of Virginia and an expert on hydration, told weather.com that young athletes should be taught t...
