Neuromuscular Research Lab, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Cruz Quebrada Dafundo, 1499-002, Lisbon, Portugal.
CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Cruz Quebrada Dafundo, 1499-002, Lisbon, Portugal.
Eur J Appl Physiol. 2018 Oct;118(10):2089-2096. doi: 10.1007/s00421-018-3940-x. Epub 2018 Jul 13.
This study aimed to determine whether men and women display a different magnitude of muscle fatigue in response to high-load (HL) and low-load blood flow-restricted (LLBFR) elbow-flexion exercise. We also explored to which extent both exercise protocols induce similar levels of muscle fatigue (i.e., torque decrement).
Sixty-two young participants (31 men and 31 women) performed dynamic elbow flexions at 20 and 75% of one-repetition maximum for LLBFR and HL exercise, respectively. Maximum voluntary isometric contractions were performed before and after exercise to quantify muscle fatigue.
Men and women exhibited similar magnitude of relative torque decrement after both exercise protocols (p > 0.05). HL was more fatiguing (∆ torque output: 11.9 and 23 N.m in women and men, respectively) than LLBFR resistance exercise (∆ torque output: 8.3 and 15.4 N.m in women and men, respectively) in both sexes, but this was largely attenuated after controlling for the differences in volume load between protocols (p > 0.05).
These data show that torque decrement in response to LLBFR and HL dynamic elbow-flexion exercise does not follow a sexually dimorphic pattern. Our data also indicate that, if performed in a multiple-set fashion and prescribed for a given volume load, elbow-flexion LLBFR exercise induces similar levels of fatigue as HL acute training. Importantly, this occurs similarly in both sexes.
本研究旨在确定男性和女性在高负荷（HL）和低负荷血流限制（LLBFR）肘部屈伸运动中对肌肉疲劳的反应是否存在不同程度。我们还探讨了这两种运动方案在多大程度上引起相似程度的肌肉疲劳（即扭矩下降）。
62 名年轻参与者（31 名男性和 31 名女性）分别以 20%和 75%的 1 次重复最大量进行 LLBFR 和 HL 运动的动态肘部屈伸运动。在运动前后进行最大自主等长收缩，以量化肌肉疲劳。
男性和女性在两种运动方案后表现出相似程度的相对扭矩下降（p > 0.05）。HL 比 LLBFR 阻力运动更疲劳（女性和男性的∆扭矩输出分别为 11.9 和 23 N.m），但在控制方案之间的体积负荷差异后，这种差异在很大程度上减弱（p > 0.05）。
这些数据表明，LLBFR 和 HL 动态肘部屈伸运动引起的扭矩下降并不遵循性别二态模式。我们的数据还表明，如果以多组方式进行并按给定的体积负荷规定，肘部屈伸 LLBFR 运动引起的疲劳程度与 HL 急性训练相似。重要的是，这在两性中都是相似的。
