PDF(Pubmed)
Abstract：
Introduction: This study examined the effects of blood flow restriction (BFR) and reperfusion on the mechanical properties of the rectus femoris muscle at rest (frequency and stiffness). Methods: Fourteen trained men (body weight = 81.0 ± 10.3 kg; BMI = 25 ± 3.0 m/kg2; height = 181 ± 4 cm; training experience = 6.0 ± 2.2 years) participated in an experimental session involving their dominant (BFR) and non-dominant leg (control). Muscle mechanical properties were measured using Myoton\'s accelerometer at the midpoint of the rectus femoris muscle at five time points. In the BFR leg, an 80% arterial occlusion pressure was applied by a cuff for 5 min. No cuff was applied in the control leg. Femoral Myoton measurements were taken from both legs 2 and 4 min after the start of BRF as well as 30 s and 2 min after the end of the occlusion period. Results: The two-way ANOVA revealed a statistically significant interaction effect for stiffness and frequency (p < 0.001; η2 > 0.67). The post hoc analysis showed that both stiffness and frequency increased during BFR compared with rest and then dropped to the resting levels post BFR period. Also, stiffness and frequency were higher than control only during the BFR period, and similar during rest and post BFR. Conclusion: These results indicate that the application of BFR at rest leads to significant changes in mechanical properties of the rectus femoris muscle.
摘要：
简介：这项研究检查了血流限制（BFR）和再灌注对静息时股直肌的机械性能（频率和刚度）的影响。方法：14名受过训练的男性（体重=81.0±10.3kg；BMI=25±3.0m/kg2；身高=181±4cm；训练经验=6.0±2.2年）参加了涉及他们的优势（BFR）和非优势腿（对照）。在五个时间点使用Myoton加速度计在股直肌的中点测量肌肉的机械性能。在BFR腿上,通过袖带施加80％的动脉闭塞压力5分钟。在对照腿中没有施加袖带。BRF开始后2分钟和4分钟以及闭塞期结束后30s和2分钟，从两腿进行股骨Myoton测量。结果：双向方差分析显示，刚度和频率的交互作用具有统计学意义（p<0.001；η2>0.67）。事后分析表明，与休息相比，BFR期间的刚度和频率均增加，然后在BFR期后下降到休息水平。此外，刚度和频率仅在BFR期间高于对照，在休息期间和BFR后相似。结论：这些结果表明，在休息时应用BFR会导致股直肌的机械性能发生显着变化。
