Proppe Christopher E, Aldeghi Taylor M, Rivera Paola M, Gonzalez-Rojas David H, Hill Ethan C
School of Kinesiology and Physical Therapy, University of Central Florida, Orlando, FL, USA.
Florida Space Institute, Orlando, FL, USA.
Int J Exerc Sci. 2023 Feb 1;16(1):293-303. doi: 10.70252/VBYY9439. eCollection 2023.
Applying blood flow restriction (BFR) during resistance exercise is a potent stimulus of muscular adaption, but there is little direct comparison of its effect on neuromuscular function. The purpose of this investigation was to compare surface electromyography amplitude and frequency responses during a 75 (1 × 30, 3 × 15) repetition bout (BFR-75) of BFR to 4 sets to failure (BFR-F). Twelve women (mean ± SD age = 22 ± 4 years; body mass = 72 ± 14.4 kg; height = 162.1 ± 4.0 cm) volunteered for the investigation. One leg was randomly assigned to complete BFR-75 and the other to BFR-F. Each leg performed isokinetic, unilateral, concentric-eccentric, leg extension at 30% of maximal strength while surface electromyographic (sEMG) data was recorded. More repetitions ( = 0.006) were completed during set 2 for BFR-F (21.2 ± 7.4) than BFR-75 (14.7 ± 1.2), but there were no other between condition differences for set 1 (29.8 ± 0.9 vs 28.9 ± 10.1), set 3 (14.4 ± 1.4 vs 17.1 ± 6.9), or set 4 (14.8 ± 0.9 vs 16.3 ± 7.0). Collapsed across condition, normalized sEMG amplitude increased ( 0.014, 132.66 ± 14.03% to 208.21 ± 24.82%) across the first three sets of exercise then plateaued, while normalized sEMG frequency decreased ( = 0.342, 103.07 ± 3.89% to 83.73 ± 4.47%) across the first two sets then plateaued. The present findings indicated that BFR-75 and BFR-F elicited similar acute neuromuscular fatigue responses. The plateau in amplitude and frequency suggested that maximal motor unit excitation and metabolic buildup may be maximized after two to three sets of BFR-75 and BFR-F.
在抗阻运动期间应用血流限制（BFR）是肌肉适应的一种有效刺激，但关于其对神经肌肉功能影响的直接比较却很少。本研究的目的是比较在75次（1组30次、3组15次）重复组次的BFR训练（BFR - 75）与4组至力竭训练（BFR - F）过程中表面肌电图的幅度和频率反应。12名女性（平均年龄±标准差=22±4岁；体重=72±14.4千克；身高=162.1±4.0厘米）自愿参与本研究。一条腿被随机分配完成BFR - 75训练，另一条腿完成BFR - F训练。每条腿在最大力量的30%下进行等速、单侧、向心 - 离心的腿部伸展运动，同时记录表面肌电图（sEMG）数据。BFR - F组在第2组完成的重复次数（21.2±7.4次）多于BFR - 75组（14.7±1.2次）（P = 0.006），但在第1组（29.8±0.9次对28.9±10.1次）、第3组（14.4±1.4次对17.1±6.9次）或第4组（14.8±0.9次对16.3±7.0次）中，两组之间没有其他差异。综合所有训练条件来看，在前三组运动中，标准化sEMG幅度增加（P = 0.014，从132.66±14.03%增加到208.21±24.82%），然后趋于平稳，而标准化sEMG频率在前两组中降低（P = 0.342，从103.07±3.89%降低到83.73±4.47%），然后趋于平稳。目前的研究结果表明，BFR - 75和BFR - F引发了相似的急性神经肌肉疲劳反应。幅度和频率的平稳状态表明，在进行两到三组BFR - 75和BFR - F训练后，最大运动单位兴奋和代谢积累可能达到最大化。
