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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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EFFECT OF A PRE-WORKOUT ENERGY SUPPLEMENT ON ACUTE MULTI-JOINT RESISTANCE EXERCISE |
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Adam M. Gonzalez1, Allyson L. Walsh1, Nicholas A. Ratamess1, Jie Kang1 and Jay R. Hoffman2  |
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1The College of New Jersey, Ewing, NJ, USA, 2University of Central Florida, Orlando, FL, USA |
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© Journal of Sports Science and Medicine (2011) 10, 261 - 266 |
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| ABSTRACT | |||
| 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. |
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