In a 1500 metres race, the majority energy will be produced by which combination?

In a 1500 metres race, the majority energy will be produced by which combination?

• A. Aerobic metabolism with carbohydrate oxidation, with some anaerobic glycolysis
• B. Purely anaerobic glycolysis
• C. Fat oxidation dominates
• D. Direct ATP from PC stores

Answer: (A)

In a 1500 m race, the body relies mainly on aerobic metabolism using carbohydrate fuel to keep a high, sustainable pace. The duration of the event (a few minutes) means oxygen supply can support most of the ATP production throughout the race. Carbohydrates are preferred at this intensity because they yield more ATP per unit of oxygen than fats, making them efficient for maintaining a fast speed. The running pace is hot enough that the body taps into anaerobic glycolysis as a supplementary source to provide extra ATP and help sustain speed, especially as the effort approaches the lactate threshold. Energy from phosphocreatine stores is only available for a brief initial burst in the first seconds and cannot power the race. Fat oxidation is too slow to meet the fast energy demands at this distance. So the majority of energy comes from aerobic metabolism with carbohydrate oxidation, plus a contribution from anaerobic glycolysis.

In a 1500 m race, the body relies mainly on aerobic metabolism using carbohydrate fuel to keep a high, sustainable pace. The duration of the event (a few minutes) means oxygen supply can support most of the ATP production throughout the race. Carbohydrates are preferred at this intensity because they yield more ATP per unit of oxygen than fats, making them efficient for maintaining a fast speed. The running pace is hot enough that the body taps into anaerobic glycolysis as a supplementary source to provide extra ATP and help sustain speed, especially as the effort approaches the lactate threshold. Energy from phosphocreatine stores is only available for a brief initial burst in the first seconds and cannot power the race. Fat oxidation is too slow to meet the fast energy demands at this distance. So the majority of energy comes from aerobic metabolism with carbohydrate oxidation, plus a contribution from anaerobic glycolysis.