For a typical adult, how long does the ATP-CP energy system last?

The ATP-CP energy system, also known as the phosphagen system, is the primary energy pathway utilized during short bursts of intense physical activity. It relies on stored adenosine triphosphate (ATP) and creatine phosphate (CP) found in the muscles to produce energy quickly, making it crucial for high-intensity performance, such as sprinting or heavy weight lifting.

For a typical adult engaged in maximal effort activities, the ATP-CP system lasts approximately 10 to 20 seconds. This duration is due to the limited supply of ATP and CP available in the muscle cells. Once the stored ATP is depleted and the creatine phosphate is used up, the body must transition to other energy systems, such as anaerobic glycolysis or aerobic metabolism, to continue generating energy for longer durations.

The other options suggest longer durations than what is typical for the ATP-CP system. For instance, durations of 20+ minutes, 10+ minutes, or 1-2 minutes exceed the capabilities of this energy pathway, which is specifically designed for short, explosive bursts of energy rather than sustained efforts.