ACSM Personal Trainer Certification Practice Exam

What is the primary characteristic of anaerobic exercise?

1. It requires oxygen for energy production

2. It does not require oxygen for energy production

3. It mainly uses fat as an energy source

4. It can be sustained for long durations

The correct answer is: It does not require oxygen for energy production

Anaerobic exercise is characterized by the absence of oxygen for energy production. This type of exercise relies on energy sources stored in the muscles, specifically using anaerobic pathways to rapidly generate ATP (adenosine triphosphate) during short bursts of high-intensity activity. Common examples include sprinting, weightlifting, and high-intensity interval training. These activities typically last from a few seconds to a few minutes and rely on energy produced through processes like glycolysis, which do not require oxygen. The other options describe characteristics that are not applicable to anaerobic exercise. Anaerobic activity does not primarily use fat as an energy source, as that process typically occurs during lower-intensity, aerobic exercise when the body has time to utilize oxygen. Additionally, anaerobic exercise is not suited for long durations; instead, it involves short, intense efforts that can lead to quick fatigue. Understanding these aspects helps clarify why option B effectively captures the essence of anaerobic exercise.