New Jelly Belly® Extreme™ Sport Beans®
Energizing Jelly Beans® offer 50 mg of caffeine, in addition to Sport Beans proven formula of carbs, vitamins and electrolytes, for athletes and active people who want an extra edge for their workouts or competitions.

Road tested by professional athletes, each 100-calorie bag of regular and new Extreme Sport Beans jelly beans delivers 25 grams of carbohydrates to fuel your body during intense exercise; a balanced supply of electrolytes (sodium and potassium) vital for maintaining fluid balance; and vitamins to help burn carbs and optimize energy release. The new Extreme formula includes 50 mg of caffeine, about the same amount of caffeine in half of a cup of brewed coffee, for an extra edge. Numerous clinical studies have documented that caffeine enhances sports performance including alertness, endurance, agility, sprint speed and power output

 

Recap - misc. studies on caffeine and athletic performance

AGILITY
ENDURANCE
POWER OUTPUT
SPRINT SPEED

Multiple Effects of Caffeine on Simulated High-Intensity Team-Sport Performance. Applied Sciences. Medicine & Science in Sports & Exercise. 37 (11):1998-2005, November 2005. Stuart, Gene R. 1; Hopkins, Will G. 1; Cook, Christian 2; Cairns, Simeon P. 1
© 2005 American College of Sports Medicine

• This study concluded that caffeine is "likely to produce substantial enhancement of several aspects of high-intensity team-sports performance." In this study, nine competitive male rugby players ingested either 6 mg of caffeine per kilogram of body weight (about 420 mg for a 155 lb. male) or a placebo 70 minutes before performing a rugby test that included measurement of sprint time, power generation and accuracy for passing balls rapidly. The effects of caffeine included better sprint speeds ranging from +.5% to 2.9% faster; better first-drive power (+5%); and improved passing accuracy (+9.6%) vs. the placebo group that had not ingested caffeine. 
  
  The study authors concluded that caffeine's enhancements stemmed from both reducing fatigue that developed throughout the test and from enhancing performance.

SPRINT SPEED

Effects of Caffeine on Prolonged Intermittent-Sprint Ability in Team-Sport Athletes
Medicine & Science in Sports & Exercise. Applied Sciences. 38(3):578-585, March 2006
Schneiker, Knut Thomas 1; Bishop, David 1; Dawson, Brian 1; Hackett, Laurence Peter 2
© 2006 The American College of Sports Medicine

• This study showed that caffeine can significantly enhance performance of prolonged, intermittent-sprint ability in competitive, male, team-sport athletes. Athletes in the study who ingested 6 mg of caffeine per kilogram of body weight (about 420 mg of caffeine for a 155 lb. male) 60 minutes before the trial were able to sprint 8.5% longer in the first half of the trial and 7.6% longer in the second half. The mean peak power score achieved by athletes in the caffeine group was also higher than for the non-caffeine trial participants.

ENDURANCE

The effect of different dosages of caffeine on endurance performance time
Pasman WJ, van Baak MA, Jeukendrup AE, de Haan A. Department of Human Biology, University of Limburg, Maastricht, The Netherlands

• Caffeine, even at low levels, significantly stimulates endurance performance, according to these study authors. In this study, cyclists received different doses of caffeine (0, 5, 9 and 13 mg. per kilogram of body weight or 0, 350, 630 or 910 mg respectively of caffeine for a 155 lb. male) and, one hour later, were asked to cycle until exhaustion. Endurance performance of all cyclists who received a caffeine capsule was significantly better than cyclists who did not receive any caffeine (in fact, there was no real difference among the caffeine recipients - even at the lowest dose level). Please note that only participants at the lowest dose of caffeine, 5 mg. per kilogram of body weight (or 350 mg for a 155 lb. male, resulted in urine caffeine concentrations below the doping limit of the International Olympic Committee (12 micrograms per milileter of urine in all individuals). Caffeine levels were tested before, during and after the exercise test.

POWER OUTPUT

Enhancement of 2000-m rowing performance after caffeine ingestion
Medicine & Science in Sports & Exercise. 32(11); 1958-1963, November 2000
Bruce, Clinton R; Anderson, Megan E.; Fraser, Steven F.; Stepto, Nigel K.; Kelin, Rudi; Hopkins, William G; Hawley, John A. Department of Human Biology and Movement Science, RMIT University, Bundoora, Victoria, Australia © 2000 Lippincott Williams & Wilkins, Inc.

• Study authors concluded that ingestion of caffeine can produce "a worthwhile enhancement of short-term performance in a controlled laboratory setting." Study participants ingested a placebo or dosages of either 6 or 9 mg of caffeine per kilogram of body weight (about 420 or 630 mg respectively of caffeine for a 155 lb. male). Rowers who received caffeine rowed faster and generated more power, as measured in this study.

POWER OUTPUT

Effect of Caffeine as an Ergogenic Aid on Anaerobic Exercise Performance in Highly Trained Athletes: 1331, Board #2
Bidwell, Wendy K; Woolf, Kathleen; Carlson, Amanda; Vaughan, Linda A. © 2006 The American College of Sports Medicine. Published by Lippincott Williams & Wilkins

• In this study, highly trained male athletes were given caffeine (5g per kg of body weight - about 350 mg of caffeine for a 155 lb. male) or a placebo. The caffeine athletes lifted significantly more total weight (weight x number of repetitions) in a chest press test. There was no difference in the weight lifted in the leg press test among caffeine and placebo athletes. Caffeine also improved peak power during a Wingate test. Study authors concluded:  "caffeine may potentially enhance anaerobic exercise performance."

ALERTNESS
SPRINT SPEED

Caffeine Maintains Vigilance and Improves Running Performance for Special Forces Personnel During a Night of Sleep Loss: 2070 Board #209
McClellan, Tom M.; Kamimori, Gary H. FACSM; Voss, David M.; Bell, Doug G.; Cole, Karl G.; Johnson, Dagny
© 2005 The American College of Sports Medicine. Published by Lippincott Williams & Wilkins

• Caffeine was found to maintain vigilance and improve running performance during an overnight field operation for Special Forces personnel in this study. A group of 31 soldiers were given either caffeine or a placebo and then participated in both running and vigilance tasks over a 3-day period. The use of 600 mg of caffeine throughout the night maintained alertness and vigilance while performance decreased for those receiving the placebo. Caffeine users also were able to run significantly faster in the running tests. Caffeine did not have an effect (positive or negative) on shooting accuracy in this study.

RATINGS OF PERCEIVED EXERTION

Effects of caffeine ingestion on rating of perceived exertion during and after exercise: a meta-analysis. Scandinavian Journal of Medicine & Science in Sports. Volume 15 Issue 2 Page 69-78, April 2005. M. Doherty, P.M. Smith, Division of Sport and Exercise Sceience, University of Luton, Luton, UK

• These researchers reviewed 21 studies, using a meta-analytic approach, to examine the effects of caffeine on ratings of perceived exertion (RPE). The research concluded that, in comparison to a placebo, caffeine reduced RPE during exercise by 5.6%.