University of Hertfordshire

From the same journal

By the same authors

Documents

  • Mark Glaister
  • Colin Towey
  • Owen Jeffries
  • Daniel Muniz
  • Paul Foley
  • Gillian McInnes
View graph of relations
Original languageEnglish
Number of pages19
JournalInternational Journal of Sports Physiology and Performance
Journal publication date11 Sep 2018
Early online date11 Sep 2018
DOIs
Publication statusE-pub ahead of print - 11 Sep 2018

Abstract

PURPOSE:
The aim of this study was to investigate the influence of torque factor and sprint duration on the effects of caffeine on sprint cycling performance.

METHODS:
Using a counterbalanced, randomized, double-blind, placebo-controlled design, 13 men completed nine trials. In Trial 1, participants completed a series of 6 s sprints at increasing torque factors, to determine the torque factor, for each individual, which elicited the highest (TOPTIMAL) peak power output (PPO). The remaining trials involved all combinations of torque factor (0.8 N∙m∙kg-1 versus TOPTIMAL), sprint duration (10 s versus 30 s), and supplementation (caffeine [5 mg∙kg-1] versus placebo).

RESULTS:
There was a significant effect of torque factor on PPO, with higher values at TOPTIMAL (mean difference: 168 W; 95% likely range: 142 - 195 W). There was also a significant effect of sprint duration on PPO, with higher values in 10 s sprints (mean difference: 52 W; 95% likely range: 18 - 86 W). However, there was no effect of supplementation on PPO (p = 0.056). Nevertheless, there was a significant torque factor × sprint duration × supplement interaction (p = 0.036), with post hoc tests revealing that caffeine produced a higher PPO (mean difference: 76 W; 95% likely range: 19 - 133 W) when the sprint duration was 10 s and the torque factor was TOPTIMAL.

CONCLUSIONS:
The results of this study show that when torque factor and sprint duration are optimized, to allow participants to express their highest PPO, there is a clear effect of caffeine on sprinting performance.

Notes

This article has been accepted for publication in the International Journal of Sports Physiology and Performance. The final publication is available at https://doi.org/10.1123/ijspp.2018-0458 © Human Kinetics 2018

ID: 15342219