Sports Drinks

Sport Drinks are becoming more popular everyday, but do you know when and how you should be drinking them? There are many different types of energy drinks on the market all promoting that their drink is the best. It isn't which brand you drink, but how you drink it. Energy drinks are beneficial to those that exercise or compete for periods of 60 minutes or longer, or exercise in warmer temperatures. The way that the body absorbs nutrients and fluids is affected by the rate at which they are emptied from the stomach into the small intestine.

Gastric Emptying

Some factors that influence gastric (stomach) emptying are that large fluid volumes in the stomach increase the emptying rate into the intestine. Other factors such as increased concentrations of solutes (sugar) and exercise intensity above 75% decreases the gastric emptying rate and may cause stomach upset, and/or diarrhea. An athletes fluid absorption is increased by consuming low to moderate levels of glucose and the temperature of the fluid doesn't seem to play as much of a role in absorption as once thought. General Guidelines Here are some guidelines to help you choose a proper energy drink...

PARTICLES

You should avoid drinks that contain high concentrations of particles because it decreases the rate of gastric emptying. There is little difference between liquid glucose, sucrose, or starch when ingested as the carbohydrate fuel source during exercise.

FRUCTOSE

Fructose is not a recommended fuel because of its slow absorption and it also promotes low fluid absorption.

CARBOHYDRATES

A re-hydration drink should contain a carbohydrate concentration between 5-8%. Higher concentrations cause a delayed gastric(stomach) emptying and possible stomach upset or diarrhea. To determine the carbohydrate concentration in a drink, divide the carbohydrate content (in grams) by the fluid volume (in milliliters) of the drink and multiply by 100. This range usually allows proper carbohydrate replacement and without limiting fluid absorption, and temperature regulation.

SODIUM

Drinks that contain sodium may benefit ultra-endurance athletes by maintaining plasma osmolality, reduces urine output, and sustains the physiological urge to drink.

Liquid Timing

Consuming 400-600ml of fluid immediately before exercise increases the beneficial effect of having an increased stomach volume, and fluid and nutrient passage into the intestine. You should continue to consume 150-250ml of fluid (at 15 minute intervals) throughout exercise to replenish the fluid that is passed into the intestine and it will also maintain a large gastric volume during exercise. The optimal carbohydrate replacement rate is between 30-60g per hour ingested at least 30 minutes before usual fatigue would have set in without a carbohydrate supplement. Maximal fluid ingestion is about 1000ml per hour to prevent dehydration without gastrointestinal discomfort.

Conclusion

Each athlete will have to determine which drink they like best or that will help them perform better. These guidelines should help you maintain proper hydration and optimize performance. The keys to a good energy drink are that it tastes good, offers the potential to improve performance, gets absorbed rapidly and won't cause stomach upset.

Comments

[jp]

Its one thing to like how these drinks taste. its entirely another to think they actually do something for you beyond general hydration. vitamins degrade in water! pre-mixed drinks packaged in clear bottles lose value if exposed to light! these are both facts proven by science. the jig is up! enhanced drinks cannot maintain their nutritional value from production to shelf to purchase. if they do, its most likely they ave been bombarded with sugars, coloring, and preservatives to mask the taste.
I just read an aritcle last week about a company who is getting ready to launch a new bottle cap technology that twists onto bottled water and drops the active vitamin formula down into the water when you twist it on. Their claim is that is is fresher, and thus more effective. Hey, it makes sense to me! if i can buy a bottle cap for 99c that giving me a fresh and natural dose of vitamins and a water for 75c, to use it with, ive just bought a better (fresher) vitamin drink for a competitive 1.75 that out performs any othr pre-mixed drink on the shelf! YOTSI!!
their website if interested: http://www.drinkyournutrition.com (or) http://www.drinkfresher.com works too i think.
I hope you find this as interesting as i do.

[marilyn]

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