Postgraduate Program in Nutrition and Health, Centre of Health Sciences, Federal University of Espirito Santo, Vitória-ES 29075-910, Brazil.
Muscle Physiology and Human Performance Research Group, Center of Physical Education and Sports, Federal University of Espirito Santo, Vitória-ES 29075-910, Brazil.
Nutrients. 2019 Jun 25;11(6):1422. doi: 10.3390/nu11061422.
Mixed martial arts (MMA) is a combat sport where competitors utilize strikes (punches, kicks, knees, and elbows) and submission techniques to defeat opponents in a cage or ring. The aim of this study was to investigate the effect of acute caffeine ingestion on punching performance by professional MMA athletes. The study used a double-blind, counterbalanced, crossover design. Eleven professional MMA competitors (27.6 ± 4.3 years and 83.5 ± 7.8 kg of body weight) ingested a dose of caffeine (5 mg·kg) or placebo 60 min prior to three sets of punching. Each set consisted of 15 s, at which participants were asked to perform straight punches with maximum strength and frequency with his dominant arm. After each set, a 45 s recovery time was applied. Using a force transducer attached to a cushioned plate, the punch frequency, and mean and maximal punch force was measured. The readiness to invest in both physical (RTIPE) and mental (RTIME) effort was assessed prior to the protocol, and the rating of perceived exertion (RPE) was recorded after. Caffeine ingestion did not result in increased punching frequency, mean and maximum punch force, RTIPE, RTIME, and RPE when compared to the placebo condition. Based on these results, acute caffeine ingestion did not improve punching performance in professional MMA athletes.
混合武术（MMA）是一种格斗运动，参赛者利用打击（拳打、踢打、膝撞和肘击）和擒拿技术在笼子或拳击台内击败对手。本研究旨在探讨急性咖啡因摄入对职业 MMA 运动员出拳表现的影响。该研究采用双盲、交叉对照设计。11 名职业 MMA 运动员（27.6 ± 4.3 岁，体重 83.5 ± 7.8 公斤）在 60 分钟前摄入 5 毫克/公斤的咖啡因或安慰剂，然后进行三组出拳。每组包括 15 秒，要求参与者用惯用臂以最大力量和频率出直拳。每组后，有 45 秒的恢复期。使用连接在缓冲板上的力传感器测量出拳频率、平均和最大出拳力。在方案开始前评估身体投入意愿（RTIPE）和心理投入意愿（RTIME），并在方案结束后记录感觉用力程度（RPE）。与安慰剂相比，咖啡因摄入并没有增加出拳频率、平均和最大出拳力、RTIPE、RTIME 和 RPE。基于这些结果，急性咖啡因摄入并未改善职业 MMA 运动员的出拳表现。
