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Effect of Glycerol-Enhanced Sports Drink in Soccer Glycerol is a hydrophilic sugar alcohol compound that is used by some athletes to promote water storage before exercise that is expected to cause large volumes of sweat loss. Researchers from the University of New Mexico recently compared the effects of two commercially available sports drinks--one with glycerol and one without--on hydration, thermoregulation and performance in a group of ten soccer players.  The players participated in two soccer-specific training sessions, consuming the glycerol-enhanced sports drink before and during one of them and the other drink before and during the other. Players experienced greater fluid losses and greater losses in blood volume in the training session with the non-glycerol-containing sports drink. However, there was no difference between the two trials in the athletes' core body temperatures or heart rates. The players also performed equally in an exhaustive running test at the end of each training session, whether fueled by the glycerol-enhanced drink or the other drink.  The authors of the study, which was published in the Journal of Strength and Conditioning Research, concluded, "Ingestion of a carbohydrate-glycerol beverage provided players with better hydration than carbohydrate alone. However, if training sessions are short (<75 minute), with adequate time for recovery, both drinks are sufficient for maintaining performance intensities during soccer-specific training."

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