Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
from September 2014
©Journal of Sports Science and Medicine (2011) 10, 261 - 266

Research article
Effect of a Pre-Workout Energy Supplement on Acute Multi-Joint Resistance Exercise
Adam M. Gonzalez1, Allyson L. Walsh1, Nicholas A. Ratamess1, Jie Kang1, Jay R. Hoffman2, 
Author Information
1 The College of New Jersey, Ewing, NJ, USA
2 University of Central Florida, Orlando, FL, USA

Jay R. Hoffman
✉ Sport and Exercise Science, University of Central Florida, PO Box 161250, Orlando, Florida 32816-1250, USA
Publish Date
Received: 03-11-2010
Accepted: 07-01-2011
Published (online): 01-06-2011
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The effect of a pre-workout energy supplement on acute multi- joint resistance exercise was examined in eight resistance-trained college-age men. Subjects were randomly provided either a placebo (P) or a supplement (S: containing caffeine, taurine, glucuronolactone, creatine, β-alanine, and the amino acids; leucine, isoleucine, valine, glutamine and arginine) 10 minutes prior to resistance exercise. Subjects performed 4 sets of no more than 10 repetitions of either barbell squat or bench press at 80% of their pre-determined 1 repetition- maximum (1RM) with 90 seconds of rest between sets. Dietary intake 24 hours prior to each of the two training trials was kept constant. Results indicate that consuming the pre-workout energy drink 10 minutes prior to resistance exercise enhances performance by significantly increasing the number of repetitions successfully performed (p = 0.022) in S (26.3 ± 9.2) compared to P (23.5 ± 9.4). In addition, the average peak and mean power performance for all four sets was significantly greater in S compared to P (p < 0.001 and p < 0.001, respectively). No differences were observed between trials in subjective feelings of energy during either pre (p = 0.660) or post (p = 0.179) meaures. Similary, no differences between groups, in either pre or post assessments, were observed in subjective feelings of focus (p = 0.465 and p = 0.063, respectively), or fatigue (p = 0.204 and p = 0.518, respectively). Results suggest that acute ingestion of a high-energy supplement 10 minutes prior to the onset of a multi-joint resistance training session can augment training volume and increase power performance during the workout.

Key words: Ergogenic aid, resistance exercise, caffeine, nutritional supplement

           Key Points
  • Consumption of a pre-workout energy supplement containing caffeine, taurine, glucuronolactone, creatine, β-alanine, and amino acids consumed 10 minutes prior to a bout of resistance exercise enhances the total number of repetitions performed during the exercise bout.
  • Power outputs for each repetition during the workout were significantly greater when using the supplement compared to placebo.
  • Ingestion of supplement did not have any significant effect on subjective measures of fatigue, energy and focus.
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