NSCF Personal Trainer Complete Practice Exam

Consuming carbohydrates prior to aerobic exercise is effective in reducing protein catabolism because carbohydrates serve as a primary energy source during physical activities. When adequate carbohydrates are available in the body, they provide the necessary fuel for muscles, which can help spare protein from being utilized for energy.

During extended aerobic exercise, if carbohydrate stores (glycogen) are depleted, the body may start to break down protein from muscle tissue to convert it into glucose for energy. This process, known as gluconeogenesis, leads to protein catabolism, which can ultimately hinder muscle recovery and growth. Therefore, ensuring that carbohydrate levels are sufficient before engaging in aerobic workouts effectively helps to maintain muscle mass and improves athletic performance.

While fats and proteins are important macronutrients, fats serve more as a secondary energy source during prolonged, low-intensity exercise, and proteins are more beneficial for post-exercise recovery rather than pre-exercise energy needs. Fiber, although essential for overall health, primarily aids digestion and does not directly contribute to energy stores for immediate exercise demands. Hence, prioritizing carbohydrate intake before aerobic workouts is the best approach to minimize the risk of protein breakdown.