Fostiak Krzysztof, Bichwoska-Paweska Marta, Trybulski Robert, Alexe Dan Iulian, Wilk Michal
Gdansk University of Physical Education and Sport, ul. Górskiego 1, 80-336, Gdansk, Poland.
Medical Department, Wojciech Korfanty Upper Silesian Academy, 40-659, Katowice, Poland.
Sci Rep. 2025 Aug 19;15(1):30312. doi: 10.1038/s41598-025-15562-z.
The study aimed to evaluate the impact of blood flow restriction (BFR) used only before sets of isokinetic knee extensions on torque and muscle activity of the Rectus Femoris muscle. Twenty healthy physically active males (age = 22.7 ± 6.7 years; body mass = 83.0 ± 15.9 kg; body height = 180.8 ± 8.3 cm) performed three experimental sessions in a random crossover design (BFR - with blood flow restriction; control - without BFR, Sham). In the BFR and Sham conditions cuffs were applied for 5 min and released 1 min prior to each set of isokinetic knee extensions. The pressure of the cuffs was 80% AOP (arterial occlusion pressure) for BFR conditions and 20 mmHg for Sham conditions. For Control conditions no restriction was applied. Experimental sessions consisted of 5 sets of 3 isokinetic knee extensions (180°/s) with 6.5-min rest intervals between sets. The repetitions were performed with maximal effort. During the concentric phase of the exercise peak torques and peak electromyographic activity of Rectus Femoris muscle were gathered. The eccentric phase was passive. The two-way repeated measures ANOVA did not show statistically significant condition × set interaction for peak torque and muscle activity. There was also no main effect of condition as well as no main effect of set for peak torque and muscle activity. The results of this study indicate that BFR intra-conditioning (5 min; 80% AOP; 1 min reperfusion) did not significantly affect strength performance or Rectus Femoris EMG activity. However, the lack of performance decline suggests it does not impair neuromuscular output, which may be beneficial in high-load training with long rest intervals. Previous research shows that BFR may induce adaptive changes not examined here. Further studies should explore these adaptations and the effects of varying BFR parameters, intensities, and work to rest ratios.
该研究旨在评估仅在等速膝关节伸展组之前使用血流限制（BFR）对股直肌扭矩和肌肉活动的影响。20名健康的体育活动男性（年龄 = 22.7 ± 6.7岁；体重 = 83.0 ± 15.9 kg；身高 = 180.8 ± 8.3 cm）采用随机交叉设计进行了三个实验阶段（BFR - 伴有血流限制；对照组 - 无BFR，假手术组）。在BFR组和假手术组条件下，在每组等速膝关节伸展前5分钟施加袖带，并在伸展前1分钟松开。BFR组袖带压力为80%动脉闭塞压（AOP），假手术组为20 mmHg。对照组不施加限制。实验阶段包括5组，每组3次等速膝关节伸展（180°/s），组间休息间隔为6.5分钟。重复动作需尽最大努力完成。在运动的向心阶段收集股直肌的峰值扭矩和峰值肌电图活动。离心阶段为被动阶段。双向重复测量方差分析未显示出峰值扭矩和肌肉活动在条件×组之间存在统计学显著的交互作用。对于峰值扭矩和肌肉活动，也没有条件的主效应以及组的主效应。本研究结果表明，BFR组内调节（5分钟；80% AOP；1分钟再灌注）对力量表现或股直肌肌电图活动没有显著影响。然而，性能未下降表明它不会损害神经肌肉输出，这在长休息间隔的高负荷训练中可能是有益的。先前的研究表明，BFR可能会诱导此处未研究的适应性变化。进一步的研究应探索这些适应性变化以及不同BFR参数、强度和工作与休息比率的影响。
