What is the typical work duration for the Phosphagen system?

• A. 10-30 seconds
• B. 1-2 minutes
• C. 3-5 minutes
• D. 5-10 seconds

Answer: (A)

The phosphagen system provides immediate energy for very short, all-out efforts by rapidly regenerating ATP from phosphocreatine without needing oxygen. Its fuel stores are highly limited, so it can sustain maximal output only for a brief window. In practice, this system supports high-intensity work roughly from about ten seconds up to around thirty seconds, with the majority of energy produced in the first few seconds. After about that 10–30 second window, other energy systems (like anaerobic glycolysis) begin to contribute more heavily as phosphocreatine gets depleted. So the typical work duration for this system is captured by the range of ten to thirty seconds.