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• W2730796004 abstract "1 Resumo -O efeito ergogenico da cafeina em exercicios anaerobios permanece controverso, parecendo ser dependente da duracao do exercicio, protocolo utilizado e do estado de treinamento dos sujeitos estudados. Assim, esta revisao surge na tentativa de analisar as pesquisas que investigaram o efeito da cafeina no desempenho de exercicios predominan- temente anaerobios e principalmente, discutir a respeito dos diferentes metodos utilizados, objetivando verificar de que forma isto pode explicar os resultados controversos, alem de apresentar os possiveis mecanismos de acao da cafeina. Em simples esforcos anaerobios com duracao inferior a 30 segundos, a cafeina parece exercer influencia no desempenho apenas em atletas, no entanto, mais estudos precisam ser feitos nesta populacao. Ja em exercicios um pouco mais extensos (de 60 ate 180 segundos), a cafeina parece melhorar o desempenho independentemente do estado de treinamento. O mecanismo de acao ainda nao esta claro, entretanto, existem evidencias que a acao da cafeina e multifatorial, visto que esta substância altera caracteristicas centrais e perifericas. Dentre as principais caracteristicas, a cafeina atua como receptor antagonico de adenosina, aumentando a excitabilidade do sistema nervoso central e alterando a percepcao de esforco e de dor, alem disso, diminui a sensibilidade do reticulo sarcoplasmatico na liberacao do calcio. Novas pesquisas que investiguem o papel da cafeina em exercicios anaerobios devem ser realizadas, utilizando amostras de individuos adaptados ao treinamento anaerobio, bem como protocolos semelhantes ao de esportes ciclicos a fim de esclarecer os resultados contraditorios. Palavras-chave: Cafeina; Desempenho atletico; Exercicio; Metabolismo energetico, Subs- tâncias para melhoria do desempenho. Abstract - The ergogenic effect of caffeine on anaerobic exercises remains controversial. Such effect seems to depend on exercise duration, test protocol, and training status of the subjects studied. Thus, the objective of this review of the literature was to analyze studies investigating the effect of caffeine on the performance of anaerobic exercises and to discuss the different methods used to measure this effect in order to try to explain controversial results, as well as to present possible mechanisms of action of caffeine. During anaerobic exercises lasting less than 30 seconds, caffeine appears to have an influence only on the performance of athletes; however, there is need of further studies with this population. Nevertheless, in longer exercises (from 60 to 180 seconds), caffeine seems to improve performance regardless of the training status. The mechanism of action remains unclear; however, there is evidence that the action of caffeine is multifactorial, since this substance changes central and peripheral characteristics. Among the main characteristics, caffeine acts as an adenosine receptor antagonist, increasing the excitability of the central nervous system and changing the perception of effort and pain, in addition to reducing the sensitivity of the sarcoplasmic reticulum during calcium release. Further studies investigating the role of caffeine in anaerobic exercises should be conducted using anaerobically trained individuals and protocols similar to those of cyclic sports in order to clarify the contradictory results." @default.
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• W2730796004 date "2012-01-01" @default.
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• W2730796004 title "Caffeine and anaerobic performance" @default.
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