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Milk Is Not a Sports Drink Researchers from Loughborough University recently compared the effects of ingesting milk, glucose-enhanced milk, a sports drink, and plain water on time to exhaustion on stationary bikes. Eight men with an average age of 24 years participated in the study. Each of them cycled to volitional exhaustion at 70 percent VO2max on four occasions. They consumed one of the following four beverages before the test and every 10 minutes through the test on each occasion: low-fat milk 0.1 percent), low-fat milk with added glucose, a carbohydrate-electrolyte solution, or plain water.  The subjects lasted an average of 110 minutes when they consumed the sports drink, 103 minutes when they consumed the milk and glucose-enhanced milk, and 93 minutes when they consumed water. These differences did not reach statistical significance. The study abstract does not provide information about gastrointestinal upset experienced during the milk trials. We would not be surprised to learn that it was an issue. It's certainly hard to imagine palating milk during hard exercise. The study was published in Nutrition.

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