This may be partly attributed to the widely reported benefits that caffeine, an ingredient common in energy drinks, has on endurance performance but not on anaerobic performance [5–11]. Caffeine has been shown to be an effective ergogenic agent by delaying fatigue and increasing time to exhaustion during endurance exercise [5–9]. Its efficacy as

an ergogenic aid during anaerobic exercise and strength/power events though is limited [8, 10, 11]. Recent studies have examined energy drinks that have been marketed primarily to the strength/power find more athlete [12, 13]. These studies investigating a pre-exercise drink comprised of caffeine in combination with taurine, glucuronolactone, and branched chain amino acids (BCAA) reported significant improvements in the volume of Nutlin 3a training (expressed as number of repetitions performed during a bout of resistance exercise) when these supplements were consumed 10 PCI-32765 purchase minutes

prior to the training session. The greater number of repetitions performed during the training session were associated with a greater anabolic response (elevations in growth hormone) [12]. Recently, a new energy drink has been developed using ingredients similar to those previously discussed studies showing enhanced resistance exercise performance. Considering that many of the ingredients within the energy supplements marketed to the strength/power athlete are similar to that found in supplements used for the endurance athlete, it is of interest to determine whether the ergogenic benefits cross performance spectrums. Interestingly, previous studies that have shown efficacy of a specific energy supplement for one mode of exercise (e.g., endurance exercise) have AMP deaminase failed to see similar efficacy

in a different exercise protocol (e.g. resistance exercise) [8]. Thus, the purpose of this study is to examine the acute effects of a pre-exercise energy supplement using ingredients previously demonstrated to enhance resistance training performance on time to exhaustion during treadmill exercise, and on subjective feelings of focus, energy and fatigue in healthy, physically active college-aged men and women. Methods Subjects Fifteen recreationally active subjects (9 men and 6 women; 20.9 ± 1.0 y; 172.1 ± 9.1 cm; 71.0 ± 9.4 kg; 16.9 ± 9.7% body fat) underwent two testing sessions administered in a randomized and double-blind fashion. Subjects were recruited from The College of New Jersey through announcements in the Health and Exercise Science Department. Following an explanation of all procedures, risks, and benefits associated with the experimental protocol, each subject gave his/her written consent prior to participating in this study and completed a medical history/physical activity questionnaire to determine eligibility.