Mouser J Grant, Ade Carl J, Black Christopher D, Bemben Debra A, Bemben Michael G
Kevser Ermin Applied Physiology Laboratory, Department of Health, Exercise Science, and Recreation Management, The University of Mississippi, University, MS, USA.
Department of Kinesiology, Kansas State University, Manhattan, KS, USA.
Clin Physiol Funct Imaging. 2018 May;38(3):425-430. doi: 10.1111/cpf.12432. Epub 2017 Apr 12.
Blood flow restriction (BFR), the application of external pressure to occlude venous return and restrict arterial inflow, has been shown to increase muscular size and strength when combined with low-load resistance exercise. BFR in the research setting uses a wide range of pressures, applying a pressure based upon an individual's systolic pressure or a percentage of occlusion pressure; not a directly determined reduction in blood flow. The relationship between relative pressure and blood flow has not been established.
To measure blood flow in the arm under relative levels of BFR.
Forty-five people (18-40 years old) participated. Arterial occlusion pressure in the right arm was measured using a 5-cm pneumatic cuff. Blood flow in the brachial artery was measured at rest and at pressures between 10% and 90% of occlusion using ultrasound.
Blood flow decreased in a nonlinear, stepped fashion. Blood flow decreased at 10% of occlusion and remained constant until decreasing again at 40%, where it remained until 90% of occlusion.
The decrease in brachial blood flow is not proportional to the applied relative pressure. The prescription of blood flow restriction should take into account the stimulus provided at each relative level of blood flow.
血流限制（BFR），即通过施加外部压力来阻断静脉回流并限制动脉流入，已被证明与低负荷抗阻运动相结合时可增加肌肉尺寸和力量。研究中的血流限制使用了广泛的压力范围，根据个体的收缩压或闭塞压力的百分比来施加压力；而不是直接测定的血流减少量。相对压力与血流之间的关系尚未确立。
测量在相对水平的血流限制下手臂中的血流情况。
45名年龄在18至40岁之间的人参与了研究。使用一个5厘米的气动袖带测量右臂的动脉闭塞压力。在静息状态以及闭塞压力的10%至90%之间的压力下，使用超声测量肱动脉中的血流。
血流以非线性、阶梯式方式下降。在闭塞压力的10%时血流下降，并保持恒定，直到在40%时再次下降，此后一直保持下降直到闭塞压力的90%。
肱动脉血流的减少与所施加的相对压力不成比例。血流限制的处方应考虑在每个相对血流水平下所提供的刺激。
