Which energy system is primarily used for high intensity activities lasting 2-3 minutes?

The correct answer is associated with the anaerobic glycolysis energy system, which is specifically designed to support high-intensity activities lasting from about 30 seconds up to 2-3 minutes. During such activities, the body relies on the breakdown of glucose for quick energy without the need for oxygen, resulting in the production of energy rapidly through the glycolytic pathway.

This energy system is crucial during activities like sprinting, high-intensity interval training, or other vigorous exercise sessions where the demand for immediate energy exceeds what can be supplied by the aerobic system. As these activities do not last long enough to switch fully to aerobic metabolism, they remain reliant on anaerobic processes, leading to the production of lactic acid, which can contribute to muscle fatigue.

The other options represent different energy systems that are not as suited for the specified duration or intensity. The aerobic energy system, for instance, is more efficient for longer-duration activities (over about 3 minutes) where oxygen can be utilized effectively. Aerobic glycolysis also operates under aerobic conditions but is effective in sustained activities rather than short bursts of high intensity. Fatty acid oxidation is primarily involved in low to moderate intensity, longer-duration activities, where fat serves as the primary fuel source, making it less relevant