What is exertional hyponatremia primarily a result of?

• A. Underhydration during exercise
• B. Overhydration or lack of sodium in the diet
• C. Excessive protein intake
• D. Increased intake of caffeine

Answer: (B)

Exertional hyponatremia primarily results from overhydration, often occurring when an individual consumes excessive amounts of water or sports drinks that are low in sodium during prolonged exercise. This overhydration dilutes the concentration of sodium in the bloodstream, leading to a lower than normal serum sodium level. While sodium is crucial for various bodily functions, including nerve and muscle function, an imbalance can have serious consequences.

Additionally, a lack of sodium in the diet may contribute, particularly in situations where individuals may not replenish their sodium stores after heavy sweating. Athletes engaged in intense endurance activities without adequate sodium intake or replacement are more susceptible to exertional hyponatremia. Hence, it is essential to balance fluid intake with sodium levels to prevent this condition during rigorous physical activities.