What is the primary fuel source used during a 200-meter hurdle event?

During a 200-meter hurdle event, the primary fuel source used is carbohydrates. This is because the activity is characterized by its high-intensity and relatively short duration, typically lasting around 20-30 seconds for elite athletes. During such intense exercise, the body relies on anaerobic energy systems, which primarily utilize carbohydrates stored as glycogen in muscles and the liver.

Carbohydrates are the most efficient source of energy for high-intensity activities because they can be rapidly broken down to provide energy quickly. While fats can be utilized as an energy source, they do so at a slower rate and are more suited for prolonged, lower-intensity activities. Proteins are not a primary fuel source during exercise but rather serve to repair tissues and support muscle synthesis, especially after workouts. Vitamins are essential for metabolic processes but do not serve as direct fuel sources. Therefore, carbohydrates are clearly the most appropriate fuel for this explosive, short-duration event.