There is a large body of evidence dating back to the 1920s but mostly from the 1980s that carbohydrates can improve
performance during more prolonged exercise (>2h). The ingested carbohydrate can prevent a drop in blood glucose concentration
and can help to maintain high rates of carbohydrate oxidation which is necessary to maintain relatively high exercise intensities.
We and other have also demonstrated that carbohydrate during exercise can also improve high intensity exercise as short as 1h
although the mechanisms may be central rather than metabolic. A greater contribution of exogenous carbohydrate
(carbohydrate from a drink or food) will spare body carbohydrate stores and is generally believed to be beneficial. Over the last 15
years we have investigated ways to improve fuel delivery to the working muscle...