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


Pitchford, NW and Fell, JW and Leveritt, MD and Desbrow, B and Shing, CM, Effect of caffeine on cycling time-trial performance in the heat, Journal of Science and Medicine in Sport, 17, (4) pp. 445-449. ISSN 1440-2440 (2014) [Refereed Article]

Copyright Statement

Copyright 2013 Sports Medicine Australia

DOI: doi:10.1016/j.jsams.2013.07.004


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 42500 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.

Item Details

Item Type:Refereed Article
Keywords:1,3,7-trimethylxanthine, heat, caffeine, core temperature, cycling
Research Division:Health Sciences
Research Group:Sports science and exercise
Research Field:Exercise physiology
Objective Division:Health
Objective Group:Specific population health (excl. Indigenous health)
Objective Field:Specific population health (excl. Indigenous health) not elsewhere classified
UTAS Author:Pitchford, NW (Dr Nathan Pitchford)
UTAS Author:Fell, JW (Associate Professor James Fell)
UTAS Author:Shing, CM (Dr Cecilia Kitic)
ID Code:85483
Year Published:2014 (online first 2013)
Web of Science® Times Cited:19
Deposited By:Health Sciences A
Deposited On:2013-07-10
Last Modified:2017-12-12

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