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Acute effects of a commercially-available pre-workout supplement on markers of training: a double-blind study
BACKGROUND: Pre-workout supplements containing numerous ingredients claim to increase performance and strength. Product-specific research is important for identifying efficacy of combined ingredients. The purpose of this study was to evaluate the effects of a proprietary pre-workout dietary suppleme...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4190923/ https://www.ncbi.nlm.nih.gov/pubmed/25302053 http://dx.doi.org/10.1186/s12970-014-0040-0 |
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author | Outlaw, Jordan J Wilborn, Colin D Smith-Ryan, Abbie E Hayward, Sara E Urbina, Stacie L Taylor, Lem W Foster, Cliffa A |
author_facet | Outlaw, Jordan J Wilborn, Colin D Smith-Ryan, Abbie E Hayward, Sara E Urbina, Stacie L Taylor, Lem W Foster, Cliffa A |
author_sort | Outlaw, Jordan J |
collection | PubMed |
description | BACKGROUND: Pre-workout supplements containing numerous ingredients claim to increase performance and strength. Product-specific research is important for identifying efficacy of combined ingredients. The purpose of this study was to evaluate the effects of a proprietary pre-workout dietary supplement containing creatine monohydrate, beta-alanine, L-Tarurine, L-Leucine, and caffeine, on anaerobic power, muscular strength, body composition, and mood states. METHODS: In a double-blind, randomized, matched-pair design, twenty male subjects (mean ± SD; 22.4 ± 9.5 yrs, 76.9 ± 11.2 kg, 22.7 ± 9.5% body fat), consumed either 30 g of a pre-workout supplement (SUP) or maltodextrin placebo (PLC) 30 minutes before a resistance training workout, after completing baseline testing. Body composition was determined via dual-energy x-ray absorptiometry (DEXA). Subjects completed 12 vertical jumps for height (VJ) and one repetition maximum (1RM) and repetitions to failure lifts on bench (BPM) and leg press (LPM). Finally, subjects completed a Wingate power test on a cycle ergometer [mean power (WMP) and peak power (WPP)]. After baseline testing, participants completed eight days of supplementation and four split-body resistance-training bouts. Side effect questionnaires were completed daily 30 minutes after consuming the supplement. Subjects completed post-supplement testing on Day 8. Data were analyzed utilizing a 2 × 2 repeated measures ANOVA [treatment (PLC vs SUP) × time (T1 vs T2)] and ninety-five percent confidence intervals. RESULTS: There were no significant treatment × time interactions (p > 0.05). There were no significant changes in %body fat (%BF; ∆-0.43 ± 0.58; p = 0.920), fat mass (∆-2.45 ± 5.72; p = 0.988), or lean body mass (LBM; 10.9 ± 12.2; p = 0.848). 95% CI demonstrated significant LBM increases for both groups. There was a main effect for time for WPP (∆100.5 ± 42.7W; p = 0.001), BPM (∆8.0 ± 12.9 lbs; p = 0.001), and LPM (∆80.0 ± 28.8 lbs; p = 0.001), with no significant differences between treatments. There was no significant difference in mood states between groups or over time. CONCLUSION: The proprietary pre-workout blend combined with eight days of training did not significantly (ANOVA) improve body composition or performance. While not significant, greater gains in LPM were demonstrated in the SUP group for lean body mass and lower body strength. Future studies should evaluate more chronic effects of proprietary pre-workout blends on total training volume and performance outcomes. |
format | Online Article Text |
id | pubmed-4190923 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-41909232014-10-10 Acute effects of a commercially-available pre-workout supplement on markers of training: a double-blind study Outlaw, Jordan J Wilborn, Colin D Smith-Ryan, Abbie E Hayward, Sara E Urbina, Stacie L Taylor, Lem W Foster, Cliffa A J Int Soc Sports Nutr Research Article BACKGROUND: Pre-workout supplements containing numerous ingredients claim to increase performance and strength. Product-specific research is important for identifying efficacy of combined ingredients. The purpose of this study was to evaluate the effects of a proprietary pre-workout dietary supplement containing creatine monohydrate, beta-alanine, L-Tarurine, L-Leucine, and caffeine, on anaerobic power, muscular strength, body composition, and mood states. METHODS: In a double-blind, randomized, matched-pair design, twenty male subjects (mean ± SD; 22.4 ± 9.5 yrs, 76.9 ± 11.2 kg, 22.7 ± 9.5% body fat), consumed either 30 g of a pre-workout supplement (SUP) or maltodextrin placebo (PLC) 30 minutes before a resistance training workout, after completing baseline testing. Body composition was determined via dual-energy x-ray absorptiometry (DEXA). Subjects completed 12 vertical jumps for height (VJ) and one repetition maximum (1RM) and repetitions to failure lifts on bench (BPM) and leg press (LPM). Finally, subjects completed a Wingate power test on a cycle ergometer [mean power (WMP) and peak power (WPP)]. After baseline testing, participants completed eight days of supplementation and four split-body resistance-training bouts. Side effect questionnaires were completed daily 30 minutes after consuming the supplement. Subjects completed post-supplement testing on Day 8. Data were analyzed utilizing a 2 × 2 repeated measures ANOVA [treatment (PLC vs SUP) × time (T1 vs T2)] and ninety-five percent confidence intervals. RESULTS: There were no significant treatment × time interactions (p > 0.05). There were no significant changes in %body fat (%BF; ∆-0.43 ± 0.58; p = 0.920), fat mass (∆-2.45 ± 5.72; p = 0.988), or lean body mass (LBM; 10.9 ± 12.2; p = 0.848). 95% CI demonstrated significant LBM increases for both groups. There was a main effect for time for WPP (∆100.5 ± 42.7W; p = 0.001), BPM (∆8.0 ± 12.9 lbs; p = 0.001), and LPM (∆80.0 ± 28.8 lbs; p = 0.001), with no significant differences between treatments. There was no significant difference in mood states between groups or over time. CONCLUSION: The proprietary pre-workout blend combined with eight days of training did not significantly (ANOVA) improve body composition or performance. While not significant, greater gains in LPM were demonstrated in the SUP group for lean body mass and lower body strength. Future studies should evaluate more chronic effects of proprietary pre-workout blends on total training volume and performance outcomes. BioMed Central 2014-08-15 /pmc/articles/PMC4190923/ /pubmed/25302053 http://dx.doi.org/10.1186/s12970-014-0040-0 Text en Copyright © 2014 Outlaw et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/4.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. |
spellingShingle | Research Article Outlaw, Jordan J Wilborn, Colin D Smith-Ryan, Abbie E Hayward, Sara E Urbina, Stacie L Taylor, Lem W Foster, Cliffa A Acute effects of a commercially-available pre-workout supplement on markers of training: a double-blind study |
title | Acute effects of a commercially-available pre-workout supplement on markers of training: a double-blind study |
title_full | Acute effects of a commercially-available pre-workout supplement on markers of training: a double-blind study |
title_fullStr | Acute effects of a commercially-available pre-workout supplement on markers of training: a double-blind study |
title_full_unstemmed | Acute effects of a commercially-available pre-workout supplement on markers of training: a double-blind study |
title_short | Acute effects of a commercially-available pre-workout supplement on markers of training: a double-blind study |
title_sort | acute effects of a commercially-available pre-workout supplement on markers of training: a double-blind study |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4190923/ https://www.ncbi.nlm.nih.gov/pubmed/25302053 http://dx.doi.org/10.1186/s12970-014-0040-0 |
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