Three groups of cyclists consumed three different types of diets: high-carbohydrate; a diet mixed in carbohydrates, fat, and protein; or a diet higher in protein and fat. The average time each group could spend cycling over a six-hour period is shown in the accompanying graph. What conclusion from the data would help an athlete or trainer improve performance?

Question

Quizplus · Accepted Answer

The graph shows that the group with a high-carbohydrate diet had the longest time cycling, which suggests that maintaining elevated blood sugar through a high-carbohydrate diet can improve performance. However, the other diets also had some level of endurance, so it cannot be concluded that endurance is entirely related to diet. There is also no evidence to support the claim that an early 50 percent drop in blood glucose is associated with improved endurance. Finally, the data clearly shows a relationship between diet and endurance, so option D is incorrect.

Three Groups of Cyclists Consumed Three Different Types of Diets