Abstract
An emerging trend in sports nutrition is the consumption of energy drinks and “energy shots”. Energy shots may prove to be a viable pre-competition supplement for runners. Six male runners (mean ± SD age and VO2max: 22.5 ± 1.8 years and 69.1 ± 5.7 mL·kg−1·min−1) completed three trials [placebo (PLA; 0 mg caffeine), Guayakí Yerba Maté Organic Energy Shot™ (YM; 140 mg caffeine), or Red Bull Energy Shot™ (RB; 80 mg caffeine)]. Treatments were ingested following a randomized, placebo-controlled crossover design. Participants ran a five kilometer time trial on a treadmill. No differences (p > 0.05) in performance were detected with RB (17.55 ± 1.01 min) or YM ingestion (17.86 ± 1.59 min) compared to placebo (17.44 ± 1.25 min). Overall, energy shot ingestion did not improve time-trial running performance in trained runners.
Highlights
IntroductionFound that 73% of 140 athletes surveyed at the 2005 Ironman Triathlon World Championships believed caffeine improved performance [1]
Caffeine (1,3,7-trimethylxanthine) is widely used among athletes, as Desbrow and Leveritt (2007)found that 73% of 140 athletes surveyed at the 2005 Ironman Triathlon World Championships believed caffeine improved performance [1]
No differences (p > 0.05) in performance were detected with Red Bull Energy ShotTM (RB) (17.55 ± 1.01 min) or Yerba MatéOrganic Energy ShotTM (YM) ingestion
Summary
Found that 73% of 140 athletes surveyed at the 2005 Ironman Triathlon World Championships believed caffeine improved performance [1]. Capsules, or anhydrous powder, caffeine improves performance of moderate to high intensity endurance exercise [2,3,4,5]. Most studies examining caffeine utilized anhydrous caffeine, which is not readily accessible to coaches and athletes. Most researchers utilize doses relative to body weight instead of the absolute doses commonly found in commercially available caffeine products. While it could be argued that weighing out a relative dose may be plausible for elite athletes, who have access to dietitians and other trained staff, most track and field/cross country running coaches in the United States have large numbers of athletes to supervise, and this is relatively impractical. A coach is far more likely to tell an athlete to “Drink this”
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