"He added that the legal, safe way to do it is through glycerin loading. The technique exploits the unusual properties of glycerin, a thick, gooey sugar alcohol that is sold in drugstores as a lubricant. Each molecule of glycerin absorbs three molecules of water. During a race, the body uses the glycerin for energy. And every time the body metabolizes a molecule of glycerin, “it unleashes three molecules of water,” Dr. Martin said.

The result, he said, is that “you have a water bank account.”

Glycerin loading, he added, should be reserved for races of a half marathon or longer, when runners are competing in intense heat for at least an hour and a half. Ten days before the Tokyo world championships, Dr. Martin told Steve Spence to try glycerin loading."



Wondering if anyone here has tried this on long rides...