What are general guidelines for hydration and fluid replacement before, during, and after exercise?

What are general guidelines for hydration and fluid replacement before, during, and after exercise?

• A. Pre-exercise: start euhydrated; During: sip regularly to prevent excessive dehydration (roughly 150–300 mL every 15–20 min for shorter sessions); After: replace fluids to regain pre-exercise body mass, consider electrolytes.
• B. During: always drink only after exercise.
• C. Pre-exercise: drink large amounts to ensure overload.
• D. Avoid electrolytes entirely.

Answer: (A)

Fluid balance around exercise means starting in a good hydration state, maintaining steady fluid intake during activity, and rehydrating afterward to restore body mass and replace lost electrolytes. Beginning exercise well-hydrated helps ensure blood volume and skin blood flow support performance and cooling. During exercise, sipping regularly is better than waiting for thirst; about 150–300 mL every 15–20 minutes helps prevent excessive dehydration for shorter sessions. After exercising, aim to drink enough to return to your pre-exercise body mass, and include electrolytes to replace sodium and other minerals lost in sweat, especially after longer or hotter workouts. This approach keeps fluid compartments balanced and supports muscle function and temperature regulation. Drinking only after exercise misses the immediate need to prevent dehydration during activity. Drinking very large amounts before exercise can cause GI discomfort or hyponatremia. Avoiding electrolytes ignores essential losses in sweat that affect fluid retention and muscle function, particularly in longer or hot sessions.

Fluid balance around exercise means starting in a good hydration state, maintaining steady fluid intake during activity, and rehydrating afterward to restore body mass and replace lost electrolytes. Beginning exercise well-hydrated helps ensure blood volume and skin blood flow support performance and cooling. During exercise, sipping regularly is better than waiting for thirst; about 150–300 mL every 15–20 minutes helps prevent excessive dehydration for shorter sessions. After exercising, aim to drink enough to return to your pre-exercise body mass, and include electrolytes to replace sodium and other minerals lost in sweat, especially after longer or hotter workouts. This approach keeps fluid compartments balanced and supports muscle function and temperature regulation.

Drinking only after exercise misses the immediate need to prevent dehydration during activity. Drinking very large amounts before exercise can cause GI discomfort or hyponatremia. Avoiding electrolytes ignores essential losses in sweat that affect fluid retention and muscle function, particularly in longer or hot sessions.