Department of Health and Exercise Science, Neuromuscular Research Laboratory, The University of Oklahoma, 1401 Asp Avenue, Room 104, Norman, OK 73019-0615, USA.
Eur J Appl Physiol. 2013 Apr;113(4):923-31. doi: 10.1007/s00421-012-2502-x. Epub 2012 Sep 27.
We sought to determine if blood flow restriction (BFR) by itself or in combination with exercise would result in prolonged decrements in torque when using restriction pressures relative to the participants' limb size. Sixteen participants were randomized into Experiment A (n = 9) or Experiment B (n = 7). Experiment A participants performed unilateral knee extensions at 30 % of their one repetition maximum (1RM) with moderate blood flow restriction on one leg (BFR + Exercise) and exercised the other leg without BFR (CON + Exercise). Experiment B participants rested for 4 min with BFR applied to one leg and rested for 4 min without any treatment on the other leg (CON). Maximal voluntary isometric torque (MVC) was measured before and immediately after the exercise or 4 min of rest, 1 h post, and 24 h post. Ratings of perceived exertion (RPE) and discomfort were taken before and after each set. MVC was significantly reduced following both exercise conditions with BFR + Exercise having the largest reduction in torque. However, torque quickly recovered by 1 h post exercise and was back to baseline by 24 h. No changes in torque were observed in Experiment B. RPE and discomfort were rated consistently higher for those in the BFR + Exercise and BFR conditions compared to control. In conclusion, BFR + Exercise does not result in prolonged decrements in torque. The acute changes in torque are due to fatigue and quickly recover back to baseline within 24 h of exercise. In addition, BFR in the absence of exercise has no effect on torque at any time point.
我们试图确定在使用与参与者肢体大小相关的限制压力时，单纯的血流限制（BFR）或与运动相结合是否会导致扭矩的延长降低。16 名参与者被随机分为实验 A（n = 9）或实验 B（n = 7）。实验 A 的参与者以 30%的最大重复次数（1RM）进行单侧膝关节伸展运动，同时对一条腿进行中等程度的血流限制（BFR + 运动），而对另一条腿不进行 BFR（CON + 运动）。实验 B 的参与者在一条腿上施加 BFR 休息 4 分钟，然后在另一条腿上不进行任何治疗休息 4 分钟（CON）。在运动或休息 4 分钟后、1 小时后和 24 小时后，测量最大自主等长扭矩（MVC）。在每组运动前后，均测量 RPE 和不适感。在 BFR + 运动和 BFR 条件下，MVC 在两种运动条件下均显著降低，其中 BFR + 运动组的扭矩降低最大。然而，扭矩在运动后 1 小时内迅速恢复，24 小时后恢复到基线水平。在实验 B 中，没有观察到扭矩的变化。与对照组相比，BFR + 运动和 BFR 条件下的 RPE 和不适感评分始终更高。总之，BFR + 运动不会导致扭矩的延长降低。扭矩的急性变化是由于疲劳引起的，并且在运动后 24 小时内迅速恢复到基线水平。此外，在任何时间点，BFR 缺乏运动对扭矩均无影响。
