What response typically occurs during exercise associated hyponatremia?

During exercise-associated hyponatremia, the body experiences an imbalance in the sodium concentration in the blood due to excessive fluid intake and inadequate sodium levels. When the sodium concentration in the blood decreases, this leads to fluid moving from the extracellular environment (the space outside the cells) into the cells, resulting in cellular swelling. This fluid shift is a physiological response to restore osmotic balance, but it can be detrimental, causing cellular dysfunction and potentially leading to complications such as cerebral edema.

The process of extracellular fluid moving into cells helps explain why option B is correct. Understanding the mechanics of how fluid balances in the body work during periods of high hydration, particularly in the context of exercise, helps clarify why this cellular shift happens during hyponatremia. Thus, it underscores the importance of maintaining proper electrolyte balance during exercise to prevent hyponatremia.