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Plos One : Caffeine Alters Anaerobic Distribution and Pacing During a 4000-m Cycling Time Trial, Volume 8

By Vinciguerra, Manlio

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Book Id: WPLBN0003944785
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos One : Caffeine Alters Anaerobic Distribution and Pacing During a 4000-m Cycling Time Trial, Volume 8  
Author: Vinciguerra, Manlio
Volume: Volume 8
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection
Historic
Publication Date:
Publisher: Plos

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Vinciguerra, M. (n.d.). Plos One : Caffeine Alters Anaerobic Distribution and Pacing During a 4000-m Cycling Time Trial, Volume 8. Retrieved from http://www.ebooklibrary.org/


Description
Description : 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.kg21 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 [219.1618.6 vs. 232.8621.4 W: effect size (ES) = 0.60 (95% CI = 0.05 to 1.16), p = 0.034] and reduced the total time [419613 vs. 409612 s: ES =20.71 (95% CI =20.09 to 21.13), 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 [64.9620.1 vs. 57.3617.5 W] and aerobic [167.964.3 vs. 161.8611.2 W] contributions were similar between conditions (p.0.05). Similarly, there were no significant differences between CAF and PLA for anaerobic work (2636367361 vs. 2388866795 J), aerobic work (6870962118 vs. 6773963912 J), or total work (9524568593 vs. 9178967709 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.

 

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