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 2013 Sports Medicine Australia
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.
|Item Type:||Refereed Article|
|Keywords:||1,3,7-trimethylxanthine, heat, caffeine, core temperature, cycling|
|Research Division:||Medical and Health Sciences|
|Research Group:||Human Movement and Sports Science|
|Research Field:||Exercise Physiology|
|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)|
|Year Published:||2014 (online first 2013)|
|Web of Science® Times Cited:||15|
|Deposited By:||Health Sciences A|
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