In which sport is the ATP-PC energy system primarily used?

The ATP-PC energy system, also known as the phosphagen system, is primarily utilized in sports and activities that require short bursts of high-intensity effort, generally lasting up to about 10 seconds. This system relies on stored adenosine triphosphate (ATP) and phosphocreatine (PC) in the muscle cells to generate energy quickly without the need for oxygen.

The shot-put is a prime example of a sport that benefits significantly from this energy system. It involves explosive strength and power, which are critical for successfully launching the shot over a short distance. Athletes in shot-put engage in high-intensity exertion for a very brief duration, which aligns perfectly with the capabilities of the ATP-PC system.

In contrast, marathon running, swimming, and cycling, particularly at longer distances, rely more on aerobic energy systems, which utilize oxygen for prolonged activities. These sports demand endurance rather than the rapid, explosive power that characterizes the shot-put event. This demonstrates why the ATP-PC system is not primarily used in those options. Thus, shot-put stands out as the sport where the ATP-PC energy system plays a crucial role in performance.