Question

multiple choice question
the use of protein as an energy fuel is used most often:

during resistance exercise.

during prolonged aerobic exercise.

while at rest.

Explanation:

• During resistance exercise, the primary energy sources are usually carbohydrates and creatine phosphate, with protein's role in energy production being less prominent compared to prolonged aerobic exercise.
• While at rest, the body primarily uses fat and carbohydrates for energy, and protein is mainly used for tissue repair and growth, not as a main energy source.
• During prolonged aerobic exercise (like long - distance running), as glycogen (carbohydrate stores) becomes depleted, the body starts to rely more on protein (through gluconeogenesis) and fat for energy. So protein is used as an energy fuel most often during prolonged aerobic exercise.

Answer:

during prolonged aerobic exercise.