Nutrition for Health, Fitness & Sport 10th Edition by Melvin Williams ,Dawn Anderson,Eric Rawson

تمرين 8

Which of the following statements relative to the intake of carbohydrates and physical performance is false?
A) If an individual has normal glycogen levels in the muscle and liver, carbohydrate feedings are usually not necessary if the exercise task is only about 60-90 minutes.
B) The intake of concentrated sugar solutions may actually impair performance if they lead to osmosis of fluids into the stomach and precipitate the feeling of gastric distress.
C) Carbohydrate intake may help delay the onset of fatigue in prolonged exercise by either preventing the early onset of hypoglycemia or delaying the depletion of muscle glycogen levels.
D) Carbohydrate intake prior to and during endurance exercise tasks lasting more than 2 hours may be helpful as a means of enhancing performance.
E) If consumed during exercise, it takes approximately 60-90 minutes for the carbohydrate to find its way into the muscle and be used as an energy source.