During exercise, what is the best-absorbed fluid and energy replacement formula?

The most effective fluid and energy replacement during exercise is a 6% carbohydrate-electrolyte solution with fructose and sucrose. This type of solution is specifically designed to optimize hydration and energy replenishment. The combination of carbohydrates (from sugars like fructose and sucrose) provides a readily available energy source that can be absorbed quickly during physical activity, helping to sustain performance.

Carbohydrate-electrolyte solutions are also beneficial because they help maintain electrolyte balance, which is crucial during prolonged exercise, especially in hot and humid conditions where electrolyte loss through sweat can be significant. The presence of multiple types of sugars, like fructose and sucrose, can enhance absorption rates in the intestines and improve the overall efficiency of energy intake during exercise.

Other options, while they may provide hydration or energy, are not as effective for the dual purpose of quick fluid absorption and energy replenishment needed during workouts. For instance, a 10% protein-electrolyte solution may not provide the rapid energy needed during endurance activities, while pure water lacks essential carbohydrates necessary for energy maintenance. A 5% glucose solution, although providing energy, does not offer the same level of electrolyte balance or absorption efficiency as the 6% carbohydrate-electrolyte solution