Effect of caffeine on cycling time-trial performance in the heat

Pitchford, Nathan W., Fell, James W., Leveritt, Michael D., Desbrow, Ben and Shing, Cecilia M. (2013) Effect of caffeine on cycling time-trial performance in the heat. Journal of Science and Medicine in Sport, 17 4: 445-449. doi:10.1016/j.jsams.2013.07.004

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Author Pitchford, Nathan W.
Fell, James W.
Leveritt, Michael D.
Desbrow, Ben
Shing, Cecilia M.
Title Effect of caffeine on cycling time-trial performance in the heat
Journal name Journal of Science and Medicine in Sport   Check publisher's open access policy
ISSN 1440-2440
1878-1861
Publication date 2013-08-09
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.jsams.2013.07.004
Open Access Status
Volume 17
Issue 4
Start page 445
End page 449
Total pages 5
Place of publication Chatswood, NSW, Australia
Publisher Elsevier Australia
Language eng
Abstract Objectives: The purpose of this investigation was to determine whether a moderate dose of caffeine would improve a laboratory simulated cycling time-trial in the heat.
Formatted abstract
Objectives The purpose of this investigation was to determine whether a moderate dose of caffeine would improve a laboratory simulated cycling time-trial in the heat.

Methods Nine well-trained male subjects (VO2max 64.4 ± 6.8 mL min−1 kg−1, peak power output 378 ± 40 W) completed one familiarisation and two experimental laboratory simulated cycling time-trials in environmental conditions of 35 °C and 25% RH 90 min after consuming either caffeine (3 mg kg−1 BW) or placebo, in a double blind, cross-over study.

Results Time-trial performance was faster in the caffeine trial compared with the placebo trial (mean ± SD, 3806 ± 359 s versus 4079 ± 333 s, p = 0.06, 90%CI 42–500 s, 86% likelihood of benefit, d = −0.79). Caffeine ingestion was associated with small to moderate increases in average heart rate (p = 0.178, d = 0.39), VO2 (p = 0.154, d = 0.45), respiratory exchange ratio (p = 0.292, d = 0.35) and core temperature (p = 0.616, d = 0.22) when compared to placebo, however, these were not statistically significant. Average RPE during the caffeine supplemented time-trial was not significantly different from placebo (p = 0.41, d = −0.13).

Conclusion Caffeine supplementation at 3 mg kg−1 BW resulted in a worthwhile improvement in cycling time-trial performance in the heat.
Keyword 1,3,7-Trimethylxanthine
Heat
Caffeine
Core temperature
Cycling
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 9 August 2013

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Human Movement and Nutrition Sciences Publications
 
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Created: Tue, 12 Nov 2013, 20:15:27 EST by Michael Leveritt on behalf of School of Human Movement and Nutrition Sciences