When and Why to Swish-n-Spit Your Sports Drink
New research shows the longer the drink stays in your mouth, the bigger the boost.
July 17, 2013
People still have trouble believing it, but the research has been out there for nine years now: swishing a sports drink in your mouth and then spitting it out boosts performance in endurance events lasting longer than about 30 minutes. In the new issue of Current Sports Medicine Reports, Asker Jeukendrup (one of the authors of the original 2004 study) reviews the existing literature to sum it up and look for patterns. But before I get to his conclusions, a quick look at another recent mouth-rinse study, published in the European Journal of Sports Science in April.
This one, by researchers at the University of Central Lancashire, digs into a practical detail: how long do you actually have to rinse to get benefits? It's an interesting question, because one study a few years ago found that rinsing and spitting a sports drink produced better results than actually swallowing the drink in a ~60-minute cycling time trial. The suggested explanation was that the carbohydrate spent more time in the mouth during rinsing, and thus had more opportunity to stimulate sensors connected to the brain, than swallowing it.
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for the rest of the story http://www.runnersworld.com/drinks-hydration/when-and-why-to-swish-n-spit-your-sports-drink