What is the maximal duration of the anaerobic energy system involving ATP?

The maximal duration of the anaerobic energy system involving ATP is approximately 10-15 seconds. This system primarily relies on the stored adenosine triphosphate (ATP) and its immediate energy replenishment via creatine phosphate. During high-intensity efforts, such as sprinting or heavy lifting, the body taps into this system for its quick energy needs. The anaerobic energy production is efficient for bursts of activity but has a limited capacity because it is primarily designed to provide energy for short durations.

As the activity continues beyond this timeframe, the body begins to shift to other energy systems, such as anaerobic glycolysis, where glucose is broken down to produce ATP, but this process takes slightly longer to ramp up. Hence, while the body can continue to perform at high intensity, the specific anaerobic energy mechanism involving ATP is maximally effective only for about 10-15 seconds before fatigue sets in due to the depletion of stored ATP and creatine phosphate.