Caffeine Alters Anaerobic Distribution and Pacing during a 4000-m Cycling Time Trial

Caffeine Alters Anaerobic Distribution and Pacing during a 4000-m Cycling Time Trial

Author Santos, Ralmony de Alcantara Google Scholar
Kiss, Maria Augusta Peduti Dal Molin] Google Scholar
Silva-Cavalcante, Marcos David Google Scholar
Correia-Oliveira, Carlos Rafaell Autor UNIFESP Google Scholar
Bertuzzi, Romulo Google Scholar
Bishop, David John Google Scholar
Lima-Silva, Adriano Eduardo Google Scholar
Institution Universidade Federal de Pernambuco (UFPE)
Universidade Federal de São Paulo (UNIFESP)
Victoria Univ
Abstract The purpose of the present study was to investigate the effects of caffeine ingestion on pacing strategy and energy expenditure during a 4000-m cycling time-trial (TT). Eight recreationally-trained male cyclists volunteered and performed a maximal incremental test and a familiarization test on their first and second visits, respectively. On the third and fourth visits, the participants performed a 4000-m cycling TT after ingesting capsules containing either caffeine (5 mg.kg(-1) of body weight, CAF) or cellulose (PLA). the tests were applied in a double-blind, randomized, repeated-measures, cross-over design. When compared to PLA, CAF ingestion increased mean power output [219.1 +/- 18.6 vs. 232.8 +/- 21.4 W; effect size (ES) = 0.60 (95% CI = 0.05 to 1.16), p = 0.034] and reduced the total time [419 +/- 13 vs. 409 +/- 12 s; ES = -0.71 (95% CI = -0.09 to -1.13), p = 0.026]. Furthermore, anaerobic contribution during the 2200-, 2400-, and 2600-m intervals was significantly greater in CAF than in PLA (p<0.05). However, the mean anaerobic [64.9 +/- 20.1 vs. 57.3 +/- 17.5 W] and aerobic [167.9 +/- 4.3 vs. 161.8 +/- 11.2 W] contributions were similar between conditions (p>0.05). Similarly, there were no significant differences between CAF and PLA for anaerobic work (26363 +/- 7361 vs. 23888 +/- 6795 J), aerobic work (68709 +/- 2118 vs. 67739 +/- 3912 J), or total work (95245 +/- 8593 vs. 91789 +/- 7709 J), respectively. There was no difference for integrated electromyography, blood lactate concentration, heart rate, and ratings of perceived exertion between the conditions. These results suggest that caffeine increases the anaerobic contribution in the middle of the time trial, resulting in enhanced overall performance.
Language English
Sponsor Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Grant number CAPES: 58
Date 2013-09-18
Published in Plos One. San Francisco: Public Library Science, v. 8, n. 9, 10 p., 2013.
ISSN 1932-6203 (Sherpa/Romeo, impact factor)
Publisher Public Library Science
Extent 10
Origin http://dx.doi.org/10.1371/journal.pone.0075399
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000324695900115
URI http://repositorio.unifesp.br/handle/11600/36761

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