Subscribe to Dr. Mirkin's free FITNESS & HEALTH NEWSLETTER
Sports Drinks

Exercisers spend millions of dollars on special sports drinks, even though none increase endurance more than the food from which they are made (1).

You become tired during exercise because you run low on fluids, salt and calories. As long as you replace these three components, you do not need to pay extra for a sport drink.

If you are going to exercise for more than 25 minutes, you can increase your endurance by drinking fluids. If you are going to exercise for more than 45 minutes, you can increase your endurance with sugared drinks, which provide a quick source of calories. Sugared drinks such as fruit juices, soft drinks and sports drinks can be absorbed just as rapidly as water.

When you exercise, you lose water through sweat. Sweat contains much less salt than blood does, so you lose far more water than salt, which causes blood levels of salt to rise. You have to lose more than two pints of water for the salt concentration in your blood to rise high enough to make you feel thirsty.

By the time you feel thirst, it is too late to catch up on your fluid loss and you will have to stop exercising. By then you are dehydrated and you may become nauseous, get muscle cramps, or feel dizzy. If you ignore the warning signs of dehydration, you can convulse and pass out.

Eating salt stimulates you to drink, and raises your blood salt level high enough to make you feel thirsty and able to retain fluid. Some sports drinks contain salt, but most people don't like the taste of a salty drink, so the salt content is usually too low to meet your needs for salt during heavy exercise. The potassium listed as an ingredient in some sports drinks is irrelevant since you will not become potassium deficient from exercise, and you get plenty of potassium in virtually all foods.

Since your drink won't supply enough salt to meet your needs when you exercise for several hours, you'll also need to eat salted peanuts, potato chips or anything else with salt that tastes good to you. For calories, it doesn't make much difference what you eat as long as it doesn't remain too long in your stomach and cause intestinal discomfort.

Previous studies showing that temperature or carbonation affect absorption have been not been supported by more recent research. Your drink can be chilled or warm, as you prefer. If you prefer the taste of a sports drink over other beverages, use it. If your favorite beverage is a cola, iced tea, lemonade or plain water, that's what you should drink when you exercise. Research overwhelmingly shows that you will drink the most of the fluid you like best.

When you're not exercising, don't get in the habit of using sports drinks or any other sugared drinks to quench thirst. They'll add up to a lot of calories with little other nutritional value. Use plain water or other calorie-free beverages instead.

JS Coombes, KL Hamilton. The effectiveness of commercially available sports drinks. Sports Medicine, 2000, Vol 29, Iss 3, pp 181-209.Address Coombes JS, Univ Tasmania, Ctr Human Movement, POB 1214, Launceston, Tas 7250, AUSTRALIA

Comparison of Sports Drinks and Other Fluids for Exercise in Hot Weather


Brand (8 oz. serving) Calories Sugar Sodium Cost/8oz
Gatorade

50

14g

110mg

$.40

Recharge

70

17g

25mg

.55

Powerade

70

19g

55mg

.33

AllSport

70

19g

55mg

.42

SuperJuice (FreshSamantha)

140

30g

0

1.25

CranApple (Ocean Spray)

160

40g

35mg

.55

Fruitopia

110

30g

80mg

.40

Iced Tea (Lipton)

80

22g

50mg

.25

Pepsi

100

27g

25mg

.25

Water

0

0

0

0-.25

Snacks - 1 oz serving

Salted peanuts

180

0

100mg

.25

Salted sunflower seeds

190

0

230mg

.25

Source: Product labels


Checked 4/11/10

May 12th, 2013
|   Share this Report!

About the Author: Gabe Mirkin, MD

Sports medicine doctor, fitness guru and long-time radio host Gabe Mirkin, M.D., brings you news and tips for your healthful lifestyle. A practicing physician for more than 50 years and a radio talk show host for 25 years, Dr. Mirkin is a graduate of Harvard University and Baylor University College of Medicine. He is board-certified in four specialties: Sports Medicine, Allergy and Immunology, Pediatrics and Pediatric Immunology. The Dr. Mirkin Show, his call-in show on fitness and health, was syndicated in more than 120 cities. Read More
Copyright 2016 Drmirkin | All Rights Reserved | Powered by Xindesigns