The serious medical condition that can occur in ultra-endurance (4+ hours)events when water alone is used to replace fluid loss is

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Hyponatremia is a condition where the concentration of sodium in the blood becomes too diluted due to excessive water intake without a corresponding increase in sodium intake. This can lead to cellular swelling and potentially life-threatening brain swelling. It is more common in ultra-endurance events where athletes may drink more water than necessary to compensate for fluid loss through sweating. Hypernatremia (A) is the opposite condition where there is an abnormally high concentration of sodium in the blood due to dehydration. Supercompensation (B) is a term used in exercise physiology to describe the increase in muscle glycogen stores that occurs after a period of carbohydrate depletion followed by high-carbohydrate intake. Glycosuria (D) is a condition where there is excess glucose in the urine, often a sign of uncontrolled diabetes.

The Serious Medical Condition That Can Occur in Ultra-Endurance (4