AFAA Personal Trainer Certification Practice Exam

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Study for the AFAA Personal Trainer Certification Exam. Engage with quizzes, flashcards, and multiple-choice questions. Prepare efficiently with hints and explanations to achieve certification success.

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Which system primarily provides energy for sustained, high-intensity activities such as soccer or basketball?

Phosphagen system
Aerobic system
Anaerobic glycolytic system
Creatine system

The correct answer is: Anaerobic glycolytic system

The anaerobic glycolytic system is the correct choice for providing energy during sustained, high-intensity activities such as soccer or basketball. This system is capable of producing energy quickly through the breakdown of glucose without requiring oxygen, which is essential during intense physical activity that exceeds the capacity of the aerobic system. As these sports often involve bursts of energy followed by short rest periods, the anaerobic glycolytic system can supply ATP (adenosine triphosphate) rapidly for activities lasting from about 30 seconds up to around 2-3 minutes. This is crucial for athletes in these sports who need to perform at a high level repeatedly throughout the game. Other systems also play a role in energy production, but they do not primarily cater to the demands of sustained high-intensity activities in the same way. The phosphagen system, for example, provides immediate energy for very short activities, typically lasting up to 10 seconds. The aerobic system is more suited for longer-duration, moderate-intensity exercises where oxygen can be used for energy, while the creatine system is often referenced alongside the phosphagen system as it helps replenish ATP but works principally in short bursts rather than sustained efforts.