NOAKES, TIMOTHY D., NEIL GOODWIN, BRIAN L. RAYNER, TREVOR BRANKEN, and ROBERT K.N. TAYLOR. Water intoxication: a possible complication during endurance exercise. Med. Sci. Sports Exerc., Vol. 17. No. 3, pp. 370–375, 1985. Four athletes developed water intoxication (hyponatremia) during endurance events lasting more than 7 hours. The etiology of the condition appears to be voluntary hyperhydration with hypotonic solutions combined with moderate sweat sodium chloride losses. The reason why the fluid excess in these runners was not corrected by increased urinary losses is unknown. When advised to drink less during prolonged exercise, three of the athletes have subsequently completed prolonged endurance events uneventfully.
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Wilderness & Environmental Medicine
Vol. 16 • No. 4
December 2005
Vol. 16 • No. 4
December 2005
hyperhydration
hyponatremia
triathlon
ultra-marathon
water intoxication
