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 high-carbohydrate diet resulted in the longest endurance time for the cyclists. This suggests that maintaining elevated blood sugar (provided by a high-carbohydrate diet) improves performance. However, it cannot be concluded that endurance is entirely related to diet, or that an early 50 percent drop in blood glucose is associated with improved endurance. It also cannot be concluded that diet is not at all related to endurance, as the graph clearly shows differences in endurance times based on different diets.

Three Groups of Cyclists Consumed Three Different Types of Diets