As well as supplying fluid, they contain carbohydrate, as an energy source. They also contain sodium and potassium to maintain electrolyte balance. Here are some hints to make sure you are getting enough fluids during sporting events Consider the length and intensity of your workout. All athletes need to drink fluids. A sports drink can give you the extra carbohydrate your body needs.
Dehydration can cause fatigue, cramping, reduced performance and heat exhaustion.
Cold water is best to drink because it empties from the stomach and enters the blood quickly. Drink before you feel thirsty, as you won't feel thirsty until after dehydration has already started. Don't drink sports drinks before exercising. Consuming sugar within an hour before exercise causes a release of insulin in the body. Insulin causes the muscles to take sugar from the blood, so when you start exercising your blood sugar may be lower than it should be, decreasing your athletic performance.