A Suplementação de Cafeína Altera a Contribuição de Energia Durante Um Contra-relógio de Ciclo de Aproximadamente 30 Minutos Baseado no Trabalho?

A cafeína demonstrou aumentar a contribuição de energia anaeróbica durante os contra-relógio de ciclismo de curta duração (TT), embora não haja informações sobre se a cafeína altera a contribuição de energia durante TTs aeróbicos mais prolongados. O objetivo deste estudo foi determinar os efeitos da suplementação de cafeína em exercícios mais longos e predominantemente aeróbicos. Quinze ciclistas do sexo masculino com treinamento recreativo (idade 38 ± 8 anos, altura 1,76 ± 0,07 m, massa corporal 72,9 ± 7,7 kg) realizaram um TT de ciclismo de ~ 30 min após 6 mg · kg-1BM de cafeína (CAF) ou placebo (PLA) suplementação e uma sessão de controle (CON) sem suplementação, em delineamento duplo-cego, randomizado, contrapeso e cross-over. A potência média de saída (MPO) foi registrada como medida de resultado. Os valores respiratórios foram medidos durante o exercício para a determinação da contribuição do sistema de energia. Os dados foram analisados ​​usando modelos mistos. CAF melhorou MPO médio em comparação com CON (P = 0,01), e uma tendência para uma melhoria em comparação com PLA (P = 0,07); não houve diferença no MPO em nenhum momento durante o exercício entre as condições. Houve um efeito principal da Condição (P = 0,04) e Tempo (P <0,0001) na concentração de lactato sanguíneo, que tendeu a ser maior no CAF vs. PLA e CON (efeito da condição, ambos P = 0,07). Avaliações de esforço percebido aumentaram ao longo do tempo (P <0,0001), sem efeito da condição ou interação (ambos P> 0,05). A contribuição de energia glicolítica foi aumentada em CAF em comparação com CON e PLA (ambos P <0,05), mas não aeróbica ou ATP-CP (ambos P> 0,05). O CAF melhorou o desempenho aeróbio do TT em comparação ao CON, o que pode ser explicado pelo aumento da contribuição de energia glicolítica.

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