What type of metabolism is used during interval training?

• A. Oxidative metabolism
• B. Glycolytic metabolism
• C. Phosphagen metabolism
• D. Lipid oxidation

Answer: (B)

During interval training, work bouts demand rapid ATP production, so the body relies mainly on anaerobic glycolysis to generate energy quickly without using oxygen. This pathway can support high-intensity efforts that last from several seconds up to a couple of minutes, making it the primary source during the intense intervals. The phosphagen system contributes at the very start of an effort, providing an immediate burst of energy, but as the interval continues, glycolysis takes over. Lipid oxidation is part of aerobic metabolism and is slower, so it isn’t the main energy source during these short, hard bouts. Oxidative metabolism, while essential for longer aerobic work and for recovery between efforts, isn’t the primary driver during the intense interval work itself.