Department of Kinesiology and Health Promotion, Troy University, Troy, AL, United States of America.
Physiol Meas. 2019 Apr 3;40(3):035003. doi: 10.1088/1361-6579/ab0d2a.
To investigate vascular adaptations to eight weeks of resistance exercise, with and without different pressures of blood flow restriction (BFR), in the upper and lower body.
Forty individuals (men = 20, women = 20) completed eight weeks of resistance exercise at very low loads (15% of one-repetition maximum (1RM)), with two levels of BFR (40% arterial occlusion pressure (AOP), 80% AOP), without BFR, and 70% of 1RM. Vascular conductance and venous compliance were measured via plethysmography before and following training in the forearms and in the calves.
Values reported as means (95% confidence intervals). Pre to post changes in vascular conductance occurred only in the high-pressure conditions (upper body: +8.29 (3.01-13.57) ml · mmHg; lower body: +7.86 (3.37-12.35) ml · mmHg) and high-load conditions (upper body: +8.60 (3.45-13.74) ml · mmHg); lower body: +7.20 (2.71-11.69) ml · mmHg) only. In the upper body, the change was significantly greater in the high-pressure and high-load conditions compared to the change observed in the low-pressure condition (-0.41 (-5.56, 4.73) ml · mmHg). These changes were not greater than the change observed in the low-load condition without pressure (+1.81 (-3.47, 7.09) ml · mmHg). In the lower body, the change in the high-pressure and high-load conditions were significantly greater than the changes observed with low-load training with (-0.86 (-5.60, 3.87) ml · mmHg) and without (-1.22 (-5.71, 3.27) ml · mmHg) a low pressure. Venous compliance increased in all groups in the upper body (+0.003 (.000 08, 0.006) ml · 100 ml · mmHg) only, with no changes in the lower body.
High-pressure BFR causes adaptations in vascular function following eight weeks of training at mechanical loads not typically associated with such adaptations.
研究在上下肢进行 8 周抗阻运动时，结合和不结合不同血流量限制（BFR）压力对血管适应性的影响。
40 名个体（男性=20，女性=20）完成了 8 周的极低负荷（15%的 1 次重复最大重量（1RM））抗阻运动，BFR 有两个水平（动脉闭塞压的 40%（AOP），80% AOP），无 BFR 和 70%的 1RM。在训练前后，通过容积描记法测量前臂和小腿的血管传导和静脉顺应性。
报告的数值为平均值（95%置信区间）。仅在高压力条件（上肢：+8.29（3.01-13.57）ml·mmHg；下肢：+7.86（3.37-12.35）ml·mmHg）和高负荷条件（上肢：+8.60（3.45-13.74）ml·mmHg）下，血管传导出现了预到后的变化；下肢：+7.20（2.71-11.69）ml·mmHg）。在上肢，与低压条件下的变化（-0.41（-5.56，4.73）ml·mmHg）相比，高压力和高负荷条件下的变化明显更大。这些变化并不大于无压力的低负荷条件下的变化（+1.81（-3.47，7.09）ml·mmHg）。在下肢，高压力和高负荷条件下的变化明显大于低负荷训练时的变化（-0.86（-5.60，3.87）ml·mmHg）和无压力的变化（-1.22（-5.71，3.27）ml·mmHg）。仅在上肢，静脉顺应性增加（所有组：+0.003（0.00008，0.006）ml·100·mmHg），而在下肢没有变化。
高压力 BFR 在机械负荷下进行 8 周训练后引起血管功能适应性改变，而这种适应性通常与机械负荷无关。
