Faculty of Health Sciences, Universidad Alfonso X El Sabio, Madrid, Spain.
University of Alcalá, Madrid, Spain.
J Int Soc Sports Nutr. 2020 Jan 3;17(1):2. doi: 10.1186/s12970-019-0332-5.
Caffeine supplementation (CAFF) has an established ergogenic effect on physical performance and the psychological response to exercise. However, few studies have compared the response to CAFF intake among athletes of different competition level. This study compares the acute effects of CAFF on anaerobic performance, mood and perceived effort in elite and moderately-trained recreational athletes.
Participants for this randomized, controlled, crossover study were 8 elite athletes (in the senior boxing national team) and 10 trained-recreational athletes. Under two experimental conditions, CAFF supplementation (6 mg/kg) or placebo (PLAC), the athletes completed a Wingate test. Subjective exertion during the test was recorded as the rating of perceived exertion (RPE) both at the general level (RPE) and at the levels muscular (RPE) and cardiorespiratory (RPE). Before the Wingate test, participants completed the questionnaires Profiles of Moods States (POMS) and Subjective Vitality Scale (SVS).
In response to CAFF intake, improvements were noted in W (11.22 ± 0.65 vs 10.70 ± 0.84; p = 0.003; [Formula: see text] =0.44), W (8.75 ± 0.55 vs 8.41 0.46; p = 0.001; [Formula: see text] =0.53) and time taken to reach W (7.56 ± 1.58 vs 9.11 ± 1.53; p < 0.001; [Formula: see text] =0.57) both in the elite and trained-recreational athletes. However, only the elite athletes showed significant increases in tension (+ 325%), vigor (+ 31%) and SVS (+ 28%) scores after the intake of CAFF compared to levels recorded under the condition PLAC (p < 0.05). Similarly, levels of vigor after consuming CAFF were significantly higher in the elite than the trained-recreational athletes (+ 5.8%).
CAFF supplementation improved anaerobic performance in both the elite and recreational athletes. However, the ergogenic effect of CAFF on several mood dimensions and subjective vitality was greater in the elite athletes.
咖啡因补充剂（CAFF）已被证实对身体表现和运动时的心理反应具有积极作用。然而，很少有研究比较不同竞技水平运动员对 CAFF 摄入的反应。本研究比较了 CAFF 对精英运动员和适度训练的业余运动员的无氧表现、情绪和感知努力的急性影响。
这项随机、对照、交叉研究的参与者包括 8 名精英运动员（国家拳击高级队）和 10 名训练有素的业余运动员。在两种实验条件下，CAFF 补充剂（6mg/kg）或安慰剂（PLAC），运动员完成了一次测功计测试。测试过程中的主观用力程度记录为总体感觉用力程度（RPE）和肌肉感觉用力程度（RPE）和心肺感觉用力程度（RPE）。在进行测功计测试之前，参与者完成了情绪状态问卷（POMS）和主观活力量表（SVS）的问卷调查。
在摄入 CAFF 后，精英运动员和训练有素的业余运动员的 W（11.22±0.65 比 10.70±0.84；p=0.003；[Formula: see text] =0.44）、W（8.75±0.55 比 8.41±0.46；p=0.001；[Formula: see text] =0.53）和达到 W 的时间（7.56±1.58 比 9.11±1.53；p<0.001；[Formula: see text] =0.57）均有显著提高。然而，只有精英运动员在摄入 CAFF 后，紧张度（+325%）、活力（+31%）和 SVS（+28%）评分均显著高于 PLAC 条件下的记录水平（p<0.05）。同样，在摄入 CAFF 后，精英运动员的活力水平明显高于训练有素的业余运动员（+5.8%）。
CAFF 补充剂可提高精英运动员和业余运动员的无氧表现。然而，CAFF 对几个情绪维度和主观活力的有益作用在精英运动员中更为明显。
