Whether you’re looking for a hit, boost, pleasing stimulant, or excuse to socialise with your friends, coffee is the go-to beverage for many fitness trainers/athletes. Coffee-drinkers enjoy the way a cup of morning brew enhances their feelings of well-being and their ability to accomplish daily tasks. An estimated 80% of us drink coffee daily. Why, we are more likely to drink coffee than eat fruit! Thank goodness moderate coffee drinking is not associated with health risks.

“Caffeine’s ergogenic effect maxes out at about 200 to 250mg caffeine. (This is much less than previously recommended.) More is not better. Experiment during training to learn what amount (if any) works best for your body!”

For fitness trainers/athletes, caffeine is a proven performance enhancer. In their new book Caffeine for Sports Performance, sports dietitians Louise Burke and Ben Desbrow and exercise physiologist Lawrence Spriet address all-things-caffeine that fitness trainers/ athletes might want to know. Here are just a few tidbits that I gleaned from this comprehensive resource. Perhaps the information will help you add a little bit of zip to your workouts.


Note: No amount of caffeine will compensate for a poor diet. If you choose to use caffeinated products to enhance your sports performance, make sure you are also fuelling wisely!

A cup of pre-exercise coffee can help most fitness trainers/athletes work harder – without realising it. Caffeine has been shown to enhance performance by about 1% to 3%, particularly in endurance sports. For example, cyclists who consumed caffeine prior to a 24mile (40 km) time-trial generated 3.5% more power than when they did the ride without caffeine.

Fitness trainers/athletes vary in their responsiveness to caffeine, from highly effective to negative. Some of the side effects associated with too much caffeine include higher heart rate, anxiety, ‘coffee stomach’, irritability and insomnia.

The recommended performanceenhancing dose of caffeine is about 1.5mg/lb (3mg/kg) body weight. This can be consumed 1 hour before the event, and/or during the event (such as a caffeinated gel or defizzed cola every hour). For example, triathletes commonly consume caffeinated gels before each segment, to distribute the caffeine throughout the event rather than have a big pre-race jolt that might make them feel shaky and unable to concentrate. Some athletes delay caffeine intake until fatigue starts to appear and then they ingest 0.5-1mg/lb (1-2 mg/kg) body weight.A daily dose of caffeine is highly beneficial for athletes _2Caffeine’s ergogenic effect maxes out at about 200 to 250mg of caffeine. (This is much less than previously recommended.) More is not better. Experiment during training to learn what amount (if any) works best for your body!

Because the amount of caffeine in coffee and tea varies, elite athletes commonly use caffeine pills or commercial products to ensure the desired intake. A comparison of the caffeine content in 16 /453 of coffee from 20 coffee venders ranged from about 60 to 260mg. Even when the researchers purchased the same brand of coffee (Starbucks Breakfast Blend) on six consecutive days, the caffeine content ranged from about 260 to 565 milligrams per 16oz/ 453g.

Research suggests the caffeine content of espresso also varies. A customer might get served 0.5 to 3.0 ounces/85g of espresso (depending on the barista’s generosity) with a caffeine range of 25 to 214mg. In general, the larger venders (such as Starbucks) offer a more consistent product. But this means you don’t know what you will be getting if you plan to purchase a pre-exercise espresso or coffee.

Energy drinks are a popular source of caffeine. A study of 500 college students in North Carolina reports 51% drank at least one energy drink in an average month in the semester. Sixty-seven percent used the energy drink to stay awake, 65%, to increase energy and 54%, to drink with alcohol while partying. Of the party-drinkers, 49% consumed 3 or more energy drinks. That makes for a wide-awake drunk who may believe it’s OK to drive a car…

A daily dose of caffeine is highly beneficial for athletes _3

Caffeinated chewing gum is popular among (sleep deprived) soldiers. The gum effectively boosts physical and mental performance and helps maintain reaction time, vigilance, and ability to think clearly. The caffeine in chewing gum gets delivered quicker than via a pill (achieving significant levels in the blood in 5 v 30 minutes) because it gets absorbed though the cheeks, not the gut.

Caffeinated colas offer not only caffeine but also a hefty dose of sugar. Colas, taken later in an event, can provide a much-needed source of fuel so the combination of caffeine plus sugar can provide a nice boost! Hence, some athletes claim defizzed Coca-Cola is their preferred sports drink despite having only 35mg caffeine per 12-ounce/340g can.

10 Caffeine is only a weak diuretic and is no longer considered to be dehydrating. A novice coffee drinker can become tolerant to the diuretic effects of caffeine in 4 to 5 days of regular caffeine intake. Even high doses (3mg/lb; 6mg/kg) have no significant effect on urine production in coffee or tea drinkers. Hence, there appears to be no hydration-related reason for athletes to avoid caffeinated beverages.

11 Caution: Consuming caffeine might contribute to negative effects. For example, let’s say you are running, rowing, or swimming in more than one competitive event in a day. If caffeine helps you go harder in the first event, will that ‘fry’ you for the second? Can taking another dose of caffeine counter that fatigue?

With a weekend tournament, will too much caffeine on the first day ruin your sleep, so you are unable to perform as well on the second day? More research is needed to answer those questions but for the moment, these situations provide good examples of why advice to use the smallest effective dose of caffeine is sensible.

12 In 1984, caffeine was banned by the International Olympic Committee (IOC) and the World Anti-Doping Agency (WADA). But in 2004, WADA reversed the ruling. New research indicated the amount of caffeine needed to reach the threshold dose was detrimental to performance.

Although caffeine is no longer banned by WADA, it is on the banned list for the NCAA, the governing body of US collegiate sports. Collegiate athletes can be cited for doping if their caffeine level is higher than 15 micrograms/ml urine. (A normal urine caffeine level is between 1-2 micrograms). Unlikely but possible.

13 Youth athletes should be fully mature and eating an optimal sports diet before even considering the use of caffeine. Again, no amount of caffeine will compensate for lousy fuelling practices.

14 For even more helpful tips and tid-bits, get a copy of Caffeine for Sports Performance. You’ll actually stay awake while reading it; this book is not a snoozer!

Boston-area sports nutritionist Nancy Clark, MS, RD counsels both casual and competitive athletes. Her private practice is in Newton, MA, USA, 617-795-1875). For information about her Sports Nutrition Guidebook and her food guide for marathoners, cyclists, and soccer players, see www.nancyclarkrd. com. For online education, see www.sportsnutritionworkshop.com.

Common Sources of Caffeine
For a 150-pound (68kg) athlete, the recommended dose of caffeine is about 200mg one hour before exercise. That’s the amount in a large mug (16oz) of coffee. No problem for most coffee-drinkers!

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