Faculty of Sport Sciences, Performance and Sport Rehabilitation Laboratory, University of Castilla-La Mancha, Toledo, Spain.
Exercise Physiology Laboratory, Camilo José Cela University, Madrid, Spain.
J Strength Cond Res. 2017 Dec;31(12):3351-3357. doi: 10.1519/JSC.0000000000001763.
Portillo, J, Del Coso, J, and Abián-Vicén, J. Effects of caffeine ingestion on skill performance during an international female rugby sevens competition. J Strength Cond Res 31(12): 3351-3357, 2017-The aim of this study was to establish the effects of a caffeine-containing energy drink on skills and technical performance during a match in female elite rugby sevens players. On 2 nonconsecutive days of a friendly tournament, 16 women from the Spanish national rugby sevens team (mean age = 23 ± 2 years) ingested 3 mg of caffeine per kilogram of body mass in the form of an energy drink or the same drink without caffeine (placebo drink). After 60 minutes for caffeine absorption, participants played 3 rugby sevens matches against another national team. Body impacts during the matches were assessed by triaxial accelerometers. The matches were videotaped, and each individual technical action was notated afterward by 2 experienced observers. In comparison with the placebo drink, the ingestion of the caffeinated energy drink increased the rate of body impacts in zone 1 (16.1 ± 4.9 vs. 20.8 ± 9.9 impacts/min, p < 0.05), zone 2 (12.2 ± 10.6 vs. 16.2 ± 15.2 impacts/min, p < 0.05), zone 3 (3.8 ± 1.5 vs. 4.7 ± 2.6 impacts/min, p < 0.05), and zone 5 (0.8 ± 0.4 vs. 1.1 ± 0.6 impacts/min, p < 0.05). The pre-exercise ingestion of the caffeinated energy drink did not affect the frequency or the quality of any rugby-specific technical actions during the games. In conclusion, the ingestion of 3 mg·kg of caffeine in the form of an energy drink increased the number of body impacts during a rugby sevens international competition which suggests a higher engagement of the players during the game. However, the caffeine ingestion did not influence the quality of the technical actions performed during the competition.
波蒂略、德尔科索和阿比亚安-维森。咖啡因摄入对国际女子七人制橄榄球赛技能表现的影响。《力量与调节研究杂志》31（12）：3351-3357，2017 年——本研究旨在确定在西班牙国家女子七人制橄榄球队的 16 名女性球员中，一种含咖啡因的能量饮料对比赛中技能和技术表现的影响。在友好锦标赛的 2 个非连续日，16 名女性按照每公斤体重 3 毫克的咖啡因剂量摄入咖啡因，形式为能量饮料或不含咖啡因的相同饮料（安慰剂饮料）。咖啡因吸收 60 分钟后，参与者与另一支国家队进行了 3 场七人制橄榄球比赛。比赛期间通过三轴加速度计评估身体冲击。比赛录像，然后由 2 名经验丰富的观察员记录每个个体技术动作。与安慰剂饮料相比，摄入含咖啡因的能量饮料增加了 1 区的身体冲击率（16.1±4.9 比 20.8±9.9 次/分钟，p<0.05）、2 区（12.2±10.6 比 16.2±15.2 次/分钟，p<0.05）、3 区（3.8±1.5 比 4.7±2.6 次/分钟，p<0.05）和 5 区（0.8±0.4 比 1.1±0.6 次/分钟，p<0.05）。运动前摄入含咖啡因的能量饮料不会影响比赛中任何特定于橄榄球的技术动作的频率或质量。总之，以能量饮料的形式摄入 3 毫克·千克咖啡因会增加国际七人制橄榄球比赛期间的身体冲击次数，这表明球员在比赛中更投入。然而，咖啡因摄入并没有影响比赛中执行的技术动作的质量。
