What is a primary example of an activity that utilizes the phosphagen energy system?

The phosphagen energy system, also known as the ATP-CP system, is primarily utilized for short bursts of high-intensity activity that last for approximately 10 seconds or less. This system relies on stored adenosine triphosphate (ATP) and creatine phosphate (CP) to produce energy very quickly, which is ideal for activities that require immediate and explosive strength or speed.

In this context, a 50 m sprint serves as a prime example of an activity that relies on the phosphagen energy system. The duration of a 50 m sprint is typically short enough (often completed in under 10 seconds for trained athletes) that the body primarily uses ATP and creatine phosphate without relying on oxygen for energy production.

In contrast, marathon running predominantly utilizes aerobic metabolism, cycling can vary in its energy sources depending on intensity and duration, and swimming can also involve both anaerobic and aerobic systems depending on the distance and effort involved. Therefore, the 50 m sprint is the clearest representation of an activity that draws heavily on the phosphagen energy system's quick energy release capacity.