Crossfit Trainer Practice Test Level 1

Which metabolic pathway is characterized as anaerobic and moderate to high power lasting less than several minutes?

1. Oxidative

2. Phosphagen

3. Glycolytic

4. Aerobic

The correct answer is: Phosphagen

The metabolic pathway recognized as anaerobic, moderate to high power, and lasting less than several minutes is the phosphagen pathway. This pathway primarily utilizes creatine phosphate stored in the muscles to rapidly regenerate ATP (adenosine triphosphate) during short bursts of high-intensity activities, such as sprinting or heavy lifting. The phosphagen system is characterized by its immediacy in providing energy. It can fuel all-out efforts for a duration of about 10 seconds to a minute, making it ideal for activities requiring quick and explosive energy output. The anaerobic nature means that it operates without the need for oxygen, allowing for rapid ATP production for very short durations. In contrast, the oxidative pathway relies on oxygen to produce energy and is suited for longer-duration, low to moderate intensity activities. Glycolytic metabolism, while also anaerobic, primarily supports slightly longer efforts, typically lasting from about 30 seconds to 2 minutes, and produces lactate as a byproduct. The aerobic pathway supports sustained activities beyond several minutes, utilizing oxygen for more prolonged energy needs. Thus, the characterization of the phosphagen pathway aligns perfectly with the conditions described in the question, making it the correct answer.