What is the primary source of energy fueling muscles during a 5km run at aerobic intensity?

Study for the BCRPA Personal Trainer Test. Prepare with flashcards and multiple choice questions, complete with hints and explanations. Strengthen your understanding to ace the exam!

During a 5km run at aerobic intensity, carbohydrates serve as the primary source of energy for the muscles. This is because carbohydrates are stored in the body as glycogen in the muscles and liver, and they can be quickly broken down into glucose, which is then utilized by the muscles for energy.

At aerobic intensity, the body efficiently uses carbohydrates because they can be metabolized rapidly to meet the immediate energy demands of running. While fats are also a significant energy source, especially during longer durations of exercise or lower intensities, carbohydrates become the preferred fuel during activities that require more immediate energy and higher output, such as a 5km run.

Protein, on the other hand, is typically not a major fuel source during this kind of exercise, as it is more commonly used for muscle repair and growth rather than energy. Vitamins are crucial for various metabolic processes, but they do not directly provide energy. Therefore, carbohydrates are the most appropriate and effective energy source in this context.

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