Exercising in the heat increases physiological stress by elevating core temperature, accelerating sweat losses, and shifting metabolism toward greater carbohydrate use, which increases glycogen depletion and the need for carbohydrate fueling. Dehydration and heat strain impair cardiovascular function and endurance performance by reducing blood volume, increasing heart rate, and making it more difficult to regulate body temperature. Athletes should develop individualized hydration plans based on sweat rate, sodium losses, exercise duration, and environmental conditions, rather than relying on generalized fluid recommendations. Ultimately, appropriate carbohydrate intake, strategic hydration, and heat acclimation are key to maintaining performance and reducing the risk of heat-related fatigue during endurance exercise
Read more of Aaron's own words from the Carbs Fuel Website: https://carbsfuel.com/blogs/news/impacts-of-the-heat-on-fueling-and-hydration-part-1