Title |
The effects of different doses of caffeine on endurance cycling time trial performance
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Published in |
Journal of Sports Sciences, December 2011
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DOI | 10.1080/02640414.2011.632431 |
Pubmed ID | |
Authors |
Ben Desbrow, Caren Biddulph, Brooke Devlin, Gary D. Grant, Shailendra Anoopkumar-Dukie, Michael D. Leveritt |
Abstract |
This study investigated the effects of two different doses of caffeine on endurance cycle time trial performance in male athletes. Using a randomised, placebo-controlled, double-blind crossover study design, sixteen well-trained and familiarised male cyclists (Mean ± s: Age = 32.6 ± 8.3 years; Body mass = 78.5 ± 6.0 kg; Height = 180.9 ± 5.5 cm VO2(peak) = 60.4 ± 4.1 ml x kg(-1) x min(-1)) completed three experimental trials, following training and dietary standardisation. Participants ingested either a placebo, or 3 or 6 mg x kg(-1) body mass of caffeine 90 min prior to completing a set amount of work equivalent to 75% of peak sustainable power output for 60 min. Exercise performance was significantly (P < 0.05) improved with both caffeine treatments as compared to placebo (4.2% with 3 mg x kg(-1) body mass and 2.9% with 6 mg x kg(-1) body mass). The difference between the two caffeine doses was not statistically significant (P = 0.24). Caffeine ingestion at either dose resulted in significantly higher heart rate values than the placebo conditions (P < 0.05), but no statistically significant treatment effects in ratings of perceived exertion (RPE) were observed (P = 0.39). A caffeine dose of 3 mg x kg(-1) body mass appears to improve cycling performance in well-trained and familiarised athletes. Doubling the dose to 6 mg x kg(-1) body mass does not confer any additional improvements in performance. |
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Country | Count | As % |
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United Kingdom | 13 | 21% |
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Canada | 3 | 5% |
Ireland | 2 | 3% |
Belgium | 1 | 2% |
Brazil | 1 | 2% |
Netherlands | 1 | 2% |
Other | 2 | 3% |
Unknown | 16 | 26% |
Demographic breakdown
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Practitioners (doctors, other healthcare professionals) | 12 | 20% |
Scientists | 4 | 7% |
Science communicators (journalists, bloggers, editors) | 2 | 3% |
Mendeley readers
Geographical breakdown
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United Kingdom | 4 | <1% |
Canada | 2 | <1% |
Germany | 1 | <1% |
Australia | 1 | <1% |
France | 1 | <1% |
New Zealand | 1 | <1% |
United States | 1 | <1% |
Unknown | 437 | 98% |
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Readers by professional status | Count | As % |
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Student > Bachelor | 136 | 30% |
Student > Master | 88 | 20% |
Student > Ph. D. Student | 37 | 8% |
Student > Postgraduate | 24 | 5% |
Researcher | 18 | 4% |
Other | 48 | 11% |
Unknown | 97 | 22% |
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Sports and Recreations | 165 | 37% |
Medicine and Dentistry | 42 | 9% |
Agricultural and Biological Sciences | 30 | 7% |
Nursing and Health Professions | 27 | 6% |
Biochemistry, Genetics and Molecular Biology | 11 | 2% |
Other | 57 | 13% |
Unknown | 116 | 26% |