Caffeine supplementation and peak anaerobic power output.

Mark Glaister, Daniel Muniz, Stephen D Patterson, Paul Foley, Gillian McInnes

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


The aim of this study was to investigate the effects of caffeine supplementation on peak anaerobic power output (Wmax). Using a counterbalanced, randomised, double-blind, placebo-controlled design, 14 well-trained men completed three trials of a protocol consisting of a series of 6-s cycle ergometer sprints, separated by 5-min passive recovery periods. Sprints were performed at progressively increasing torque factors to determine the peak power/torque relationship and Wmax. Apart from Trial 1 (familiarisation), participants ingested a capsule containing 5 mg·kg−1 of caffeine or placebo, one hour before each trial. The effects of caffeine on blood lactate were investigated using capillary samples taken after each sprint. The torque factor which produced Wmax was not significantly different (p ≥ 0.05) between the caffeine (1.15 ± 0.08 N·m·kg−1) and placebo (1.13 ± 0.10 N·m·kg−1) trials. There was, however, a significant effect (p < 0.05) of supplementation on Wmax, with caffeine producing a higher value (1885 ± 303 W) than placebo (1835 ± 290 W). Analysis of the blood lactate data revealed a significant (p < 0.05) torque factor × supplement interaction with values being significantly higher from the sixth sprint (torque factor 1.0 N·m·kg−1) onwards following caffeine supplementation. The results of this study confirm previous reports that caffeine supplementation significantly increases blood lactate and Wmax. These findings may explain why the majority of previous studies, which have used fixed-torque factors of around 0.75 N·m·kg−1 and thereby failing to elicit Wmax, have failed to find an effect of caffeine on sprinting performance.
Original languageEnglish
Pages (from-to)400-406
Number of pages7
JournalEuropean Journal of Sport Science
Issue number5
Early online date2 Oct 2014
Publication statusPublished - 4 Jul 2015


  • Wingate
  • sprinting
  • ergogenic aid
  • peak power


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