Efficacy of Gatorade vs Water in Rehydration

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It has long been established that both short and long-term exercise increase metabolic rate and heat production. This naturally predisposes participants to dehydration. Typical symptoms of dehydration include elevated temperature, fluid and electrolyte imbalance due to sweating, and loss of critical nutrients, such as glycogen (depleted via metabolic pathways). Many individuals participating in moderate to rigorous training schedules may engage in daily exercise, if not multiple exercise routines in one day (3,4,5,6). It then follows that the goal for these individuals should be avoidance of dehydration and maximization of rehydration through maintenance of electrolyte balance, replenishment of muscle glycogen, and plasma osmolality. Thus, examination of a fluid’s efficacy in these three areas is crucial. Through extensive research, it is evident that Gatorade will rehydrate faster and more effectively than water.
Vital to maintenance of homeostasis is the regulation of plasma osmolality. The Renin-Angiotensin-Aldosterone system, which works to regulate blood pressure, plays a crucial role in fluid balance. When dehydration occurs, blood osmolality increases, which stimulates the release of antidiuretic hormone (ADH), ultimately leading to increased water reabsorption. This leads to more concentrated urine, and less concentrated plasma. Low plasma osmolality works in the opposite fashion: ADH release is inhibited, water reabsorption decreases, and urine is less concentrated. The added electrolytes and carbohydrates in Gatorade would facilitate greater fluid retention through stimulation of renin and vasopressin, increasing urinary sodium reabsorption (3). Studies of both urine volume and plasma volume changes are eff...

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...the effects of osmolality and carbohydrate content of ingested drinks. Nutrition 905-913, 2009.
3. Osterberg KL, Pallardy, SE, Johnson RJ, Horswill CA. Carbohydrate exerts a mild influence on fluid retention following exercise-induced dehydration. J Appl Physiol 108:245-250, 2010.
4. Shi X, Gisolfi CV. Fluid and carbohydrate replacement during intermittent exercise. Sports Med 25 (3): 157-172, 1998.
5. Shirreffs SM, Aragon-Vargas LF, Keil M, Love TD, Phillips S. Rehydration after exercise in the heat: a comparison of 4 commonly used drinks. International Journal of Sport Nutrition and Exercise Metabolism 17:244-258, 2007.
6. Snell PG, Ward R, Kandaswami C, Stohs SJ. Comparative effects of selected non-caffeinated rehydration sports drinks on short-term performance following moderate dehydration. Journal of the International Society of Sports Nutrition 7:28-36, 2010.

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