The 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 can occur when water alone is used to replace fluid loss in ultra-endurance events. This is because excessive water intake can dilute the body's sodium levels, leading to symptoms such as nausea, headache, confusion, seizures, and even coma. It is important for athletes to also replenish electrolytes lost through sweat, such as sodium, potassium, and magnesium.

The Condition That Can Occur in Ultra-Endurance (4+ Hours) Events