According to a study conducted by scientists at the Gatorade Sports Science Institute (GSSI) in Barrington, IL, athletes consistently underestimate how much water they need to stay hydrated. The study concluded athletes could not estimate their sweat losses and fluid consumption during a 10-mile race. Eighteen seasoned runners participated in the study. The results showed that the runners drastically underestimated how much sweat they lost and consequently drank too little to stay well hydrated. The runners underestimated their sweat losses by an average of 46 percent and their fluid intake by an average of 15 percent, resulting in the runners replacing only 30 percent of their fluids lost through sweat.
"These data show that even the most experienced runners are unable to accurately estimate their sweat losses and cannot subjectively judge how much fluid to drink to prevent dehydration," said Mary Horn, M.S., co-author of the study and exercise sensory scientist at GSSI. "If seasoned athletes such as these do such a poor job of judging their fluid needs, the potential for dehydration may be more severe for the average exerciser, especially during the hot summer months."
Be sure to drink plenty of fluids throughout the week, and make water a permanent and consistent part of your day. After all, it's good for you.
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