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More aisle space is being dedicated towards the growing line up of sports drinks, but should the demand for these products be growing?

Today's "In Your Cart" explores how who should be drinking these beverages, when they should be consumed, how much should be consumed, and a brief comparison of the products that are out there along with a homemade recipes from the leading author on Sports Nutrition, Nancy Clark.

Before we begin, let's briefly review how an athlete's body works. Blood is 95% fluid and carries energy to the muscles including glucose, our bodies' preferred energy source. Muscle is 75% fluid and stores two-thirds of our carbohydrate or glucose supply in the form of glycogen. Sodium and potassium are needed for proper muscle contraction and heart rhythm. The perfect sports drink contains fluid to keep blood, muscle and cells in general hydrated, glucose for energy and sodium and potassium so our heart (a muscle) and our working muscles performing at their best.

Who Should Be Drinking Sports Drinks?
Water is the fluid of choice in events lasting less than one hour but switch to sports drinks for longer activities or during high heat, high humidity workouts. Water, while keeping your blood and muscles hydrated, is missing the carbohydrate (energy) to fuel longer activities and the sodium and potassium (electrolytes) lost in sweat. Sports drinks should not replace water, low fat dairy and 100% fruit juice with and between meals and should be limited to exercise.

When Should They Be Consumed?
The American College of Sports Medicine recommends athletes start drinking early because by the time your brain registers that you are thirsty, you are already on the road to being dehydrated. Drink at regular intervals drink enough fluids or every 15-20 minutes. Think about the professional athletes on TV. Every time they have a time out, they have a water bottle in their hand. The Fifth Third River Bank Run has aide stations with Gatorade and water station every 1 ½ miles, or 15-20 minutes. Sweating is one sign that you are properly hydrated. When you exercise, the muscles that perform the work create internal heat that is released from the your body in the form of sweat. In the absence of sweat, your body temperature rises, you become overheated and your performance worsens. . Another good measure that you have stayed on top of your fluid needs during exercise is to weigh yourself before and after, with the goal of limiting your weight change to less than one percent. One pound of weight loss generally means you were 2 cups too short on keeping up with your fluid needs during your workout.

How Much Should You Consume?
According to the American College of Sports Medicine (ACSM) and the American Dietetic Association (ADA), you should drink 6-12 ounces of fluid at 15-20 minute intervals. This should include 30-60 grams of carbohydrate per hour to keep blood sugar levels in the correct range along with a steady source of electrolytes.

Nancy Clark's Homemade Recipe
Mix 4 Tbsp. sugar, ¼ tsp. salt, ¼ cup orange juice and 3.5 cups cold water. Some people substitute lemon juice or unsweetened KoolaideKool-Aid mix for the orange juice for a variety in flavor.

Product Comparison

A Water Bottle is the beverage of choice in events lasting less than 1 hour unless high heat or humidity is aare a factors. Water adequately hydrates our body, is free and helps avoid unnecessary calories and sugar found in sports drinks.
Vitamin Water Zero is the equivalent of water with vitamins and minerals added. While this version contains potassium, it has no sodium that is lost in sweat and no carbohydrate to provide fuel in longer events.

Muscle Milk is expensive at $3.25 per serving. More protein does not create bigger muscles, rather muscles grow through progressive exercise as small tears are created, muscless rebuild growing stronger and bigger. Research published by Moore DR, Robinson MJ and Fry JL in the American Journal of Clinical Nutrition suggests that our bodies can NOT use more than 20 grams at a time, in fact an excess of protein is actually dehydrating. A cup will only hold so much water and the same is true of your muscles.

Coconut Water is a very rich source of potassium yet it is lower in carbohydrates than many sports drinks and weak in sodium. It is not an optimal choice for endurance athletes.

Propel Zero contains sodium and potassium electrolytes that are lost in our sweat along with some vitamins and minerals. However; it does not contain any fuel for endurance events. It is a good option for people who work out less than one hour, who are heavy sweaters or exercising in high heat and humidity and want to avoid extra calories.

PowerAde is similar to Gatorade in its energy and sodium contribution but contains 25% less potassium. Its energy source is high fructose corn syrup which more and more people are trying to reduce.

Gatorade has an adequate sodium and potassium ratio although many endurance athletes will choose to further supplement with an electrolyte tablet especially if they are heavy sweaters. We encourage individuals to discuss the use of these supplements with their physician. It contains 14 grams of carbohydrate per 8 ounce serving and the energy source is sucrose and dextrose. It's the most commonly offered beverage at sporting events.

Courtesy:

Sheryl Lozicki is a Registered Dietitian at Saint Mary's Health Care, a member of the new Mercy Health and the Director of Nutrition and Wellness.

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