Which training increases the activities of key glycolytic enzymes?

• A. Sprint training
• B. High-intensity interval training
• C. Endurance training
• D. Resistance training

Answer: (A)

Sprint training drives the muscles to rely on anaerobic glycolysis to produce ATP quickly, so the body upregulates the enzymes that control this pathway. Repeated near-maximal efforts increase the activity of key glycolytic enzymes (like phosphofructokinase and lactate dehydrogenase), boosting the rate of glycolysis and the ability to generate energy rapidly for short, explosive actions. Over time, this adaptation becomes more pronounced in fast-twitch fibers, enhancing sprint performance through a greater glycolytic capacity. Endurance training, by contrast, mainly boosts oxidative, mitochondrial enzyme activities and aerobic energy production, not glycolytic capacity. Resistance training focuses on strength and neural adaptations with only more modest glycolytic enzyme changes, whereas sprint training directly targets and elevates glycolytic enzyme activity, which is why it’s the best fit for this question.