CanFitPro Personal Training Specialist Practice Test

Which system is known as the phosphagen system?

1. ATP-CP phase 1

2. ATP-CP phase 2

3. Anaerobic (glycolytic) system

4. Aerobic (glycolytic) system

The correct answer is: ATP-CP phase 1

The phosphagen system, also known as the ATP-CP system, is recognized for its critical role in providing quick bursts of energy during high-intensity activities that last for a short duration, typically up to about 10 seconds. This system relies on adenosine triphosphate (ATP) and creatine phosphate (CP) stored in the muscle cells. During high-intensity exertion, ATP is broken down to produce energy, and because the amount of stored ATP in the muscles is limited, the creatine phosphate helps to rapidly replenish ATP. This is why the phosphagen system is essential for activities like sprinting or heavy lifting, where immediate energy is needed but cannot be sustained for prolonged periods. In contrast, the other options represent different energy systems that kick in after the initial burst provided by the phosphagen system. The anaerobic glycolytic system provides energy for moderate high-intensity efforts lasting from about 10 seconds to 2 minutes, while the aerobic system is utilized for lower-intensity, longer-duration activities, primarily utilizing oxygen for energy production. The distinction helps in understanding how the body transitions between different energy systems based on the intensity and duration of the activity being performed.