Proppe Christopher E, Rivera Paola M, Gonzalez-Rojas David H, Fukuda David H, Wilson Abigail T, Mansy Hansen A, Hill Ethan C
University of Central Florida.
Florida Space Institute.
Res Q Exerc Sport. 2025 Jun;96(2):248-258. doi: 10.1080/02701367.2024.2391422. Epub 2024 Sep 4.
There is conflicting evidence related to the prevalence and magnitude of exercise-induced muscle damage (EIMD) following four sets to volitional failure with BFR (BFR-F) or 75 total repetitions with BFR (1 × 30, 3 × 15, BFR-75). The purpose of this investigation was to examine muscle swelling, peak torque, and neuromuscular responses following BFR-75 and BFR-F. Thirteen untrained women completed unilateral isokinetic (120°s) leg extensions concentric-eccentric at 30% of their maximal voluntary isometric contraction (MVIC) using BFR-75 and BFR-F protocols, separated by 15 minutes. Ultrasound was used to assess muscle thickness, cross sectional area, and echo intensity of the rectus femoris and vastus lateralis before, 0-, 24-, 48-, 72-, and 96-hours post-exercise. Peak torque and surface electromyography (sEMG) were recorded during MVICs before, 24-, 48-, 72-, and 96-hours post-exercise to determine sEMG amplitude, frequency, and neuromuscular efficiency. There were no differences between conditions. Collapsed across conditions, muscle thickness and cross-sectional area increased at 0-hours for the rectus femoris (2.5 ± 0.4, 2.8 ± 0.4 cm, 10.6 ± 1.8, 12.1 ± 1.8 cm, respectively) and vastus lateralis (2.1 ± 0.5, 2.5 ± 0.7 cm; 22.2 ± 3.9, 25.1 ± 4.5 cm, respectively), but returned to baseline at 24-hours. There were no changes in echo intensity, sEMG amplitude, sEMG frequency, or neuromuscular efficiency. MVIC peak torque increased relative to pre-exercise at 24-, 48-, 72-, and 96-hours (159.9 ± 34.9, 171.4 ± 30.1-179.1 ± 35.6 Nm). These results suggest that BFR-75 and BFR-F did not cause EIMD but caused an acute increase in muscle swelling that returned to baseline 24-hours post-exercise.
关于在使用血流限制（BFR）进行四组至力竭（BFR-F）或使用BFR进行75次重复（1×30、3×15，BFR-75）后运动诱导的肌肉损伤（EIMD）的患病率和严重程度，存在相互矛盾的证据。本研究的目的是检查BFR-75和BFR-F后的肌肉肿胀、峰值扭矩和神经肌肉反应。13名未经训练的女性使用BFR-75和BFR-F方案，在其最大自愿等长收缩（MVIC）的30%下完成单侧等速（120°/秒）腿部伸展的向心-离心运动，两组运动间隔15分钟。在运动前、运动后0、24、48、72和96小时，使用超声评估股直肌和股外侧肌的肌肉厚度、横截面积和回声强度。在运动前、运动后24、48、72和96小时的MVIC期间记录峰值扭矩和表面肌电图（sEMG），以确定sEMG幅度、频率和神经肌肉效率。各条件之间没有差异。综合各条件来看，股直肌（分别为2.5±0.4、2.8±0.4厘米；10.6±1.8、12.1±1.8平方厘米）和股外侧肌（分别为2.1±0.5、2.5±0.7厘米；22.2±3.9、25.1±4.5平方厘米）在0小时时肌肉厚度和横截面积增加，但在24小时时恢复到基线水平。回声强度、sEMG幅度、sEMG频率或神经肌肉效率没有变化。在运动后24、48、72和96小时，MVIC峰值扭矩相对于运动前增加（159.9±34.9、171.4±30.1 - 179.1±35.6牛米）。这些结果表明，BFR-75和BFR-F不会导致EIMD，但会导致肌肉肿胀急性增加，并在运动后24小时恢复到基线水平。
