Mouser J Grant, Dankel Scott J, Jessee Matthew B, Mattocks Kevin T, Buckner Samuel L, Counts Brittany R, Loenneke Jeremy P
Department of Health, Exercise Science, and Recreation Management, Kevser Ermin Applied Physiology Laboratory, The University of Mississippi, P.O. Box 1848, University, MS, 38677, USA.
Integrative Muscle Biology Laboratory, Department of Exercise Science, University of South Carolina, Columbia, SC, USA.
Eur J Appl Physiol. 2017 Jul;117(7):1493-1499. doi: 10.1007/s00421-017-3644-7. Epub 2017 May 13.
The blood flow response to relative levels of blood flow restriction (BFR) across varying cuff widths is not well documented. With the variety of cuff widths and pressures reported in the literature, the effects of different cuffs and pressures on blood flow require investigation.
To measure blood pressure using three commonly used BFR cuffs, examine possible venous/arterial restriction pressures, and measure hemodynamic responses to relative levels of BFR using these same cuffs.
43 participants (Experiment 1, brachial artery blood pressure assessed) and 38 participants (Experiment 2, brachial artery blood flow assessed using ultrasound, cuff placed at proximal portion of arm) volunteered for this study.
Blood pressure measurement was higher in the 5 cm cuff than in the 10 and 12 cm cuffs. Sub-diastolic relative pressures appear to occur predominantly at <60% of arterial occlusion pressure (AOP). Blood flow under relative levels of restriction decreases in a non-linear fashion, with minimal differences between cuffs [resting: 50.3 (44.2) ml min; 10% AOP: 42.0 (36.8); 20%: 33.6 (28.6); 30%: 23.6 (20.4); 40%: 17.1 (15.9); 50%: 12.5 (9.4); 60%: 11.5 (8.1); 70%: 11.4 (7.0); 80%: 10.3 (6.3); 90%: 7.9 (4.8); 100%: 1.5 (2.9)]. Peak blood velocity remains relatively constant until higher levels (>70% of AOP) are surpassed. Calculated mean shear rate decreases in a similar fashion as blood flow.
Under relative levels of restriction, pressures from 40 to 90% of AOP appear to decrease blood flow to a similar degree in these three cuffs. Relative pressures appear to elicit a similar blood flow stimulus when accounting for cuff width and participant characteristics.
关于不同袖带宽度下相对血流限制（BFR）水平的血流反应，目前尚无充分的文献记载。鉴于文献中报道的袖带宽度和压力各不相同，不同袖带和压力对血流的影响需要进行研究。
使用三种常用的BFR袖带测量血压，检查可能的静脉/动脉限制压力，并使用这些相同的袖带测量对相对BFR水平的血流动力学反应。
43名参与者（实验1，评估肱动脉血压）和38名参与者（实验2，使用超声评估肱动脉血流，袖带置于手臂近端）自愿参与本研究。
5厘米袖带测量的血压高于10厘米和12厘米袖带。舒张期相对压力似乎主要出现在动脉闭塞压力（AOP）的60%以下。相对限制水平下的血流呈非线性下降，袖带之间差异最小[静息：50.3（44.2）毫升/分钟；10%AOP：42.0（36.8）；20%：33.6（28.6）；30%：23.6（20.4）；40%：17.1（15.9）；50%：12.5（9.4）；60%：11.5（8.1）；70%：11.4（7.0）；80%：10.3（6.3）；90%：7.9（4.8）；100%：1.5（2.9）]。峰值血流速度在超过较高水平（>AOP的70%）之前保持相对恒定。计算得出的平均剪切率与血流以相似的方式下降。
在相对限制水平下，AOP的40%至90%的压力似乎在这三种袖带中以相似程度降低血流。考虑袖带宽度和参与者特征时，相对压力似乎会引发相似的血流刺激。
