It is heating up out there – both the weather and racing! When planning your race nutrition and hydration, it is important to keep these two items separate.
The first item is fuel. When you plan your race nutrition, there is a certain number of calories or grams of carbohydrates per hour that you aim for. This is usually 60 grams of carbohydrates (or 240 calories) or .45 grams of carbohydrate for every pound of body weight. You have to try this out and see what works for you and your GI tract.
The second item is hydration. To get an idea of how much fluid you need per hour, you can conduct a sweat trial. This gives you an idea of the fluid ounces of water you need per hour to stay hydrated.
When you train and race, these items are often combined in the form of liquid nutrition or sports drinks. However, it is important to remember that these are really two separate things. Although you do get liquid calories in sports drinks and you also get water, you may not want to consume all of your water with calories. Here is an example:
Joe needs 60 grams of carbohydrates per hour for his race nutrition and 40 oz of water. He plans on racing for an hour and has three water bottles each of which holds 24 oz (a total of 72 oz). In order to make both his nutrition and hydration work, he could mix 30 grams of carbohydrates from a powdered sports drink in each of two sports bottles. After adding the powdered sports drink, he adds 18 oz of water (what the bottle will hold in water after putting in the powdered sports drink). He fills the third bottle with water. This gives him his 60 grams of carbohydrates (3o grams of carbohydrates per bottle) and a total of 60 oz of water (18+18+24).
The other reason for thinking of nutrition and fluid separately is to be able to scale your hyrdation based on the condiditons. If you are racing on a cooler day, you may need less water. On a hotter day, you may need more water. Joe knows that no matter what he needs to drink those two bottles of sports drink to get his nutrition, and he can drink more or less water based on the temperature and humidity.
As you plan your training and race nutrition and hydration, remember that although they often seem to be the same, they really are separate things that you have to think about executing based on what you need for carbohydrates and fluid.

