Which energy system is primarily used to run up one flight of stairs in about 10 seconds?

The ATP-CP (Anaerobic) system is primarily utilized during short bursts of high-intensity activity, such as running up a flight of stairs in approximately 10 seconds. This energy system provides immediate energy for muscular contractions by using stored adenosine triphosphate (ATP) and creatine phosphate (CP) within the muscle cells.

When an athlete engages in an explosive effort, such as sprinting up stairs, the body relies heavily on the ATP-CP system due to its ability to generate energy quickly without the need for oxygen, making it ideal for activities that last under 15 seconds. After this time interval, however, the muscle's ATP and CP stores become depleted, and the body must then begin to utilize other energy systems, such as the anaerobic lactic or aerobic systems, which take longer to kick in and involve different metabolic processes.

In this context, while the anaerobic lactic system does play a role in activities that extend beyond 10 seconds, the immediate energy for a quick ascent primarily derives from the ATP-CP system. The aerobic system, although crucial for sustained lower-intensity exercises, is not involved in such short, high-intensity efforts. Additionally, while the heart, lungs, and circul