Filip-Stachnik Aleksandra, Krzysztofik Michal, Kaszuba Magdalena, Leznicka Katarzyna, Kostrzewa Maciej, Del Coso Juan, Wilk Michal
Institute of Sport Sciences, Jerzy Kukuczka Academy of Physical Education in Katowice, Katowice, Poland.
Faculty of Physical Education, Gdansk University of Physical Education and Sport, Gdansk, Poland.
J Hum Kinet. 2021 Mar 31;78:219-228. doi: 10.2478/hukin-2021-0044. eCollection 2021 Mar.
The main goal of this study was to evaluate the effectiveness of an acute dose of caffeine (6 mg/kg body mass (b.m.)) on power output and bar velocity during a bench press multiple-set resistance training session in participants with mild daily caffeine consumption (in the range of 1 to 3 mg/kg/b.m). Thirteen recreationally active male participants (age: 21.9 ± 1.2 years, body mass: 74.4 ± 5.3 kg, body mass index: 23.1 ± 1.6 kg/m, bench press onerepetition maximum (1RM): 79.2 ± 14.9 kg), with daily caffeine ingestion of 1.56 ± 0.56 mg/kg/b.m., participated in the study with a randomized double-blind experimental design. Each participant performed two identical experimental sessions, 60 min after the intake of a placebo (PLAC) or 6 mg/kg/b.m. of caffeine (CAF-6). In each experimental session, participants performed 5 sets of 5 repetitions of the bench press exercise with a load equivalent to 70% 1RM. The eccentric and concentric phases of the bench press exercise were performed at maximal possible velocity in each repetition. Bar velocity was recorded with a linear position transducer and power output was calculated using velocity and load data. A two-way repeated measures ANOVA indicated no significant substance x set interaction for mean power output (MP), mean bar velocity (MV), peak power output (PP) and peak bar velocity (PV). However, there was a significant main effect of substance on MP (p < 0.01; η = 0.47) and MV (p < 0.01; η =0.45). Post hoc analysis for main effect revealed that MP and MV values in the CAF-6 group were higher than in the PLAC group in all 5 sets of the exercise (p < 0.05). In conclusion, this study demonstrated that an acute dose of caffeine before resistance exercise increased mean power output and mean bar velocity during a multiple-set bench press exercise protocol among mild caffeine users.
本研究的主要目的是评估急性剂量咖啡因（6毫克/千克体重）对轻度日常摄入咖啡因（摄入量在1至3毫克/千克体重范围内）的参与者在卧推多组抗阻训练期间的功率输出和杠铃速度的影响。13名有休闲运动习惯的男性参与者（年龄：21.9±1.2岁，体重：74.4±5.3千克，体重指数：23.1±1.6千克/米²，卧推一次最大重复量（1RM）：79.2±14.9千克），每日咖啡因摄入量为1.56±0.56毫克/千克体重，参与了这项随机双盲实验设计的研究。每位参与者在摄入安慰剂（PLAC）或6毫克/千克体重的咖啡因（CAF - 6）60分钟后进行两个相同的实验环节。在每个实验环节中，参与者以相当于70% 1RM的负荷进行5组，每组5次的卧推练习。卧推练习的离心和向心阶段在每次重复中以最大可能速度进行。使用线性位置传感器记录杠铃速度，并利用速度和负荷数据计算功率输出。双向重复测量方差分析表明，对于平均功率输出（MP）、平均杠铃速度（MV）、峰值功率输出（PP）和峰值杠铃速度（PV），物质×组间无显著交互作用。然而，物质对MP（p < 0.01；η = 0.47）和MV（p < 0.01；η = 0.45）有显著主效应。主效应的事后分析显示，在练习的所有5组中，CAF - 6组的MP和MV值均高于PLAC组（p < 0.05）。总之，本研究表明，在抗阻训练前急性摄入一剂咖啡因可提高轻度咖啡因使用者在多组卧推练习方案中的平均功率输出和平均杠铃速度。
