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Randomized Controlled Trial
. 2013 Jun 6;5(6):2062-75.
doi: 10.3390/nu5062062.

The effects of caffeinated "energy shots" on time trial performance

Matthew Mark Schubert  1 , Todd Anthony Astorino, John Leal Azevedo Jr
Affiliations
Randomized Controlled Trial

The effects of caffeinated "energy shots" on time trial performance

Matthew Mark Schubert et al. Nutrients. .

Abstract

An emerging trend in sports nutrition is the consumption of energy drinks and "energy shots". Energy shots may prove to be a viable pre-competition supplement for runners. Six male runners (mean ± SD age and VO2max: 22.5 ± 1.8 years and 69.1 ± 5.7 mL·kg-1·min-1) completed three trials [placebo (PLA; 0 mg caffeine), Guayakí Yerba Maté Organic Energy Shot™ (YM; 140 mg caffeine), or Red Bull Energy Shot™ (RB; 80 mg caffeine)]. Treatments were ingested following a randomized, placebo-controlled crossover design. Participants ran a five kilometer time trial on a treadmill. No differences (p > 0.05) in performance were detected with RB (17.55 ± 1.01 min) or YM ingestion (17.86 ± 1.59 min) compared to placebo (17.44 ± 1.25 min). Overall, energy shot ingestion did not improve time-trial running performance in trained runners.

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Figures

Figure 1
Figure 1
(A) Individual five kilometer performance and overall mean ± SD in response to ingestion of RB, YM, or PLA. (B) Mean ± SD running speed in response to ingestion of RB, YM, or PLA during TT. PLA = solid black line with squares (■); YM = dotted light grey line with triangles (▲); RB = dashed dark grey line with circles (●).
Figure 2
Figure 2
A Respiratory exchange ratio (RER) mean ± SD in response to ingestion of RB, YM, or PLA during TT. PLA = solid black line with squares (■); YM = dotted light grey line with triangles (▲); RB = dashed dark grey line with circles (●). Figure 2B: RPE mean ± SD in response to ingestion of RB, YM, or PLA during TT. PLA = solid black line with squares (■); YM = dotted light grey line with triangles (▲); RB = dashed dark grey line with circles (●).
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