Authors

A. M. Gonzalez; A. L. Walsh; N. A. Ratamess; J. Kang;J. R. Hoffman

Comments

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Abbreviated Journal Title

J. Sport. Sci. Med.

Keywords

Ergogenic aid; resistance exercise; caffeine; nutritional supplement; CENTRAL-NERVOUS-SYSTEM; ACUTE HORMONAL RESPONSE; TWITCH SKELETAL-MUSCLE; CHAIN AMINO-ACIDS; CAFFEINE INGESTION; ANAEROBIC EXERCISE; PERFORMANCE; TAURINE; GLUTAMINE; CREATINE; Sport Sciences

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, beta-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.

Journal Title

Journal of Sports Science and Medicine

Volume

10

Issue/Number

2

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

261

Last Page

266

WOS Identifier

WOS:000291088400003

ISSN

1303-2968

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