Smathers pointed out that, while all carbohydrates function as relatively quick energy sources, simple carbs cause bursts of energy much more quickly than complex carbs because of the quicker rate at which they are digested and absorbed. (livescience.com)
Carbohydrates provide a quick fuel source for the brain and proved a quick energy source for muscles. (nutritionalpearlspodcast.com)
Isotonic sports drinks are good for providing a quick energy source. (personaltraining4u.net)