Andrew Jagim Ph.D, CSCSRunners, cyclists, and other endurance athletes are constantly looking for ways to improve their performance.  A commonly used strategy is the use of nutritional supplements to “boost” energy and enable them to perform longer and or harder before fatigue sets in.  The majority of energy used during endurance events is derived from carbohydrates.  Carbohydrates can be stored in the liver and skeletal muscle as glycogen.  When exercise lasts l...