Pep Drinks

High-octane energy beverages may help, or hinder, your workout—just follow the rules

It’s not surprising that opportunistic beverage manufacturers have created a new chapter in the sports brew genre: energy drinks. The latest energy cocktails meld coffee-like doses of caffeine, and other invigorating ingredients, with ultra-sweet soda. Treat these beverages with respect and the supercharged liquid may kick-start your workouts. Drink a few-to-many and you’ll tremble like a novice trapeze artist. Some companies have added amino acids, vitamins and minerals to theoretically enhance mood and improve performance. There is little published research on the benefits (if any) of these vigor elixirs--most “energy-boosting” effects are due to the presence of caffeine or caffeine-containing substances like guarana. Here’s the skinny on caffeine and the latest energy drink craze.

Caffeine: Past And Present

Caffeine is quite possibly the world’s most common stimulant. It’s found in coffee, soda, cold medications, diet pills and now, energy drinks. The discovery of caffeine’s reviving effects can be traced to an ancient Arabian goatherd named Kaldi. One day Kaldi noticed that his goats were more peppy than usual (it’s safe to say that he had a lot of time on his hands). So he followed the goats up the mountainside and tasted some of the red berries that they were eating. As the legend goes, the energized goatherd ran back into town where he shared his discovery with the locals.

A Quick Pick-Me-Up

According to Susan M. Kleiner, Ph.D., R.D., co-author of Power Eating, energy beverages provide a jolt from caffeine and other stimulants, and a quick surge of energy from sugar. She attributes the performance-enhancing effects of caffeine to three possible theories: Caffeine triggers the release of epinephrine--the “fight or flight” hormone that not only prepares you to escape from a burning building, but helps you burn stored fat during a workout. Second, caffeine helps stimulate chemicals that improve muscle contraction, although the research is inconclusive at best. The third theory suggests that caffeine psychologically excites the user, thereby distracting you through a tough workout.

Dr. Kleiner notes that energy drinks, infused with caffeine, guarana and taurine, are popular among both students and truck drivers. People on college campuses and behind the wheel use these substances in an attempt to stay focused in sleep-deprived situations. Guarana boasts caffeine-like properties, which temporarily stimulate the user and help reduce fatigue. “Taurine allegedly improves mental alertness; however these claims are really not substantiated by the scientific literature,” adds Kleiner.

Row Faster

Athletes have recognized the benefits of caffeine for many years. In fact experts consider caffeine to have an ergogenic (performance enhancing) effect. According to an Australian study, competitive rowers who consumed about 100 mg of caffeine prior to a 2000-meter rowing test experienced a 2.7% increase in power while performance time decreased by 1.2%. Scientists noticed no change in the control group. In other words, drinking the amount of caffeine found in a cup of coffee may improve performance in short-duration endurance activities.

Be Still Your Beating Heart

On your way into the gym, you down a can of Super Turbo Juice and your heart starts pounding like a teenager on prom night. Dennis McGorry Jr., M.D., family physician in Allentown, Pennsylvania, says the caffeine in an energy drink may cause rapid heart rate in a small portion of the population. “Consult your doctor if you have an abnormal heartbeat or an increased heart rate that is accompanied by chest pain or dizziness,” says Dr. McGorry.

You: The Lab Rat

If you decide to sample one of the latest supercharged energy potions, at least treat them with the respect they deserve. Contrary to popular belief, most energy drinks have about as much eye-opening caffeine as your average cup of coffee (100 mg). According to Melvin H. Williams, Ph.D., author of Ergogenics Edge, a normal therapeutic dose of caffeine is 100-300 milligrams. If you want to use caffeine to boost your workouts, Dr. Williams recommends five milligrams of caffeine per kilogram body weight. For a 150-pound woman, that’s about 340 milligrams (less than three-and-a-half cups of coffee). Yet just because a little is good, more is not necessarily better. “If you consume more than the recommended amount you can expect nervousness, trembling and possibly impaired performance,” says Dr. Williams. To maximize the stimulating effect of caffeine-rich beverages, take a coffee break. “Abstaining from caffeine for two to three days before a workout may bolster the caffeine-induced epinephrine release, and theoretically increase fat burning during your workout,” says Williams.

Final Thoughts

In the wake of the energy juice craze you should continue to practice sound, portion-controlled eating habits. Remember that everyone is unique and may react differently to these high-octane beverages. If you routinely consume too many energy drinks, or cups of coffee for that matter, you’ll do more harm than good. Talk to your doctor about if you notice any changes in your health.

Turn to Chapter 3 of WeddingShape Diet and Fitness Guide for Brides to find out more insider nutrition secrets that you can use right now to look fabulous on your big day.

How Many Calories Do You Need?

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How to Sleep Away Pounds

More fantastic health insights from Erikka, our bride-to-be...

Sleep is most important when I am busiest, and have the least amount of time to rest.

When my sleep pattern is erratic, or I don’t get enough sleep, it seems to take me days to recover. I accomplish less the next day. I feel sluggish and tired. And I get sick more often.

Lately I’ve made an effort to do two things to help me deal with the stresses of planning a wedding: 1) get to bed at the same time every night, 2) get at least eight hours of sleep. I can’t believe the difference that a good night’s sleep makes—I feel refreshed and energized each morning. Plus I have more pep throughout the day!

Also, I’ve read that you burn fat when you get quality rest, because your body releases fat-burning chemicals in the deepest stages of sleep. Losing weight while sleeping? What could be better than that?

Check out the insider's guide to sculpting your wedding-day figure.