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Camilla Astley, Diego Souza and Marcos Polito

Purpose:

To compare the acute effect of caffeine ingestion on performance in young judo athletes.

Method:

In a randomized double-blind design, eighteen judo athletes (16.1 ± 1.4 yrs.) were evaluated on three nonconsecutive days. On the first day, the special judo fitness test (SJFT) was used as a control session. On the second day, the sample was randomly divided into two equal groups. One group received 4 mg.kg-1 of caffeine (capsule) and the other group received a placebo. After resting for 60 min, the sample performed the SJFT. On the final day of testing, the same procedure was performed but the substance ingested was exchanged between the groups.

Results:

Heart rate (HR) and rating of perceived exertion (RPE) were recorded throughout the applications of the SJFTs. Caffeine ingestion did not induce changes in HR, but reduced the RPE compared with the placebo session (7.0 ± 1.1 vs 8.2 ± 2.0; p < .05), increased the number of throws applied (29.0 ± 2.6 vs 22.1 ± 3.4; p < .01) and reduced the SJFT index (12.2 ± 0.5 vs. 15.7 ± 0.9; p < .001).

Conclusion:

4 mg.kg-1 did not alter HR but improved performance on SJFT in young judo athletes and reduced the RPE.

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Hermann Zbinden-Foncea, Isabel Rada, Jesus Gomez, Marco Kokaly, Trent Stellingwerff, Louise Deldicque and Luis Peñailillo

Caffeine (1,3,7-trimethylxanthine) is a natural stimulant, widely consumed around the world, with a structure similar to that of endogenous metabolites and a broad tissue distribution including the central nervous and cardiovascular systems, as well as skeletal muscle. 1 Caffeine has been

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Peter J. Whalley, Chey G. Dearing and Carl D. Paton

Caffeine (1,3,7-trimethylxanthine) is the most widely consumed of all psychoactive drugs and is frequently used by athletes as a performance-enhancing ergogenic aid. A number of previous reviews have comprehensively documented the performance-enhancing effects of caffeine for both aerobic- 1 , 2

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Mayur K. Ranchordas, George King, Mitchell Russell, Anthony Lynn and Mark Russell

The prevalence of caffeine (1,3,7-trimethylxanthine; C 8 H 10 N 4 O 2 ) usage within elite sport is high, with 75% of athletes having reported its use prior to and/or during competition ( Del Coso et al., 2011 ). The ergogenicity of moderate caffeine doses (i.e., up to 3 mg/kg body mass [BM]) is

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Tiago Turnes, Rogério S.O. Cruz, Fabrizio Caputo and Rafael A. De Aguiar

possess a lower margin to detect substantial improvements in performance, and therefore it should be considered when evaluating the magnitude of effect of preconditioning strategies on 2000-m performance. 8 , 12 , 17 Among the preconditioning strategies, caffeine (1,3,7-trimethylxanthine) is the world

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Laís Monteiro Rodrigues Loureiro, Caio Eduardo Gonçalves Reis and Teresa Helena Macedo da Costa

kinase; ACC = acetyl-CoA carboxylase. Caffeine Caffeine is an alkaloid, chemically known as 1,3,7-trimethylxanthine ( Nuhu, 2014 ). It is the most known coffee component, and, as such, coffee accounts for most of the caffeine consumed worldwide ( Harland, 2000 ). It has been studied for many decades for