Final answer:
Low/restricted carb diets can reduce exercise capacity and time to fatigue during high-intensity exercises due to limited availability of carbohydrates, which are the primary source of fuel for such activities. The statement that low/restricted carb diets reduce exercise capacity/ time to fatigue due to limited carbohydrate intake is generally true (a).
Step-by-step explanation:
The statement that low/restricted carb diets reduce exercise capacity/ time to fatigue due to limited carbohydrate intake is generally true. Carbohydrates play a crucial role in energy production, particularly during high-intensity exercises, where they are the primary source of fuel due to the quick availability of glucose for ATP production. During low-intensity activities, the body tends to use fatty acids as the primary energy source, which allows for sustained activity since fat reserves are substantial.
However, during high-intensity exercises such as anaerobic activities, the body relies heavily on carbohydrates. If the carbohydrate intake is limited, as in the case of low-carb diets, glycogen stores can be depleted more quickly, leading to faster onset of fatigue. Hence, consuming adequate carbohydrates is important for athletes or individuals engaging in high-intensity or prolonged endurance exercises to maintain optimal performance levels.