Which energy system is predominantly used during short-duration activities?

The ATP/PC energy system, also known as the phosphagen system, is primarily utilized during short-duration, high-intensity activities that last for about 10 seconds or less. This system relies on adenosine triphosphate (ATP) and phosphocreatine (PC) that are stored in the muscles. When explosive movements or bursts of energy, like sprinting or heavy lifting, occur, the body uses the readily available ATP and quickly regenerates it through the breakdown of phosphocreatine.

This energy system does not require oxygen, making it anaerobic in nature, which is vital for sustaining the intense output needed for such activities where immediate energy is crucial. The other systems mentioned—like the aerobic energy system and the oxidative system—kick in during longer-duration activities that require sustained energy over time, and the pathway of glycolysis also involves a longer process before it can contribute effectively in high-intensity sports. Thus, the ATP/PC energy system is specifically tailored for short bursts of high-effort activities, confirming its role as the predominant system in those contexts.