a Department of Kinesiology and Health Promotion, Troy University, Troy, AL 36082, USA.
b Department of Exercise Science, Lindenwood Belleville, Belleville, IL 62226, USA.
Appl Physiol Nutr Metab. 2019 Mar;44(3):288-292. doi: 10.1139/apnm-2018-0325. Epub 2018 Aug 27.
It is proposed that, at very low loads, greater blood flow restriction (BFR) pressures might be required for muscular adaptation to occur. The cardiovascular and hyperemic response to very low loads combined with relative levels of BFR is unknown. Ninety-seven participants were recruited and assigned to 1 of 4 exercise conditions: 15% of 1-repetition maximum (1RM) without BFR (15/00), 15% 1RM with BFR at 40% of arterial occlusion pressure (AOP) (15/40), 15% of 1RM with BFR at 80% of AOP (15/80), and 70% of 1RM without BFR (70/00). Participants performed 4 sets of unilateral biceps curls. Blood pressure was measured before and after exercise; brachial artery blood flow was measured before exercise, following the second set, and 1 min following exercise. Systolic blood pressure increased following exercise in all conditions (+10 (11) mm Hg, P < 0.0005). Diastolic pressure increased in all but 70/00 (+2 (11) mm Hg, P = 0.107). Brachial artery blood flow increased following the second set of exercise in all but 15/80 (+43.4 (76.8) mL·min, P = 0.348). One minute following exercise and cuff deflation, there were no differences in blood flow between conditions (P > 0.05). Similarly, artery diameter was increased in all conditions except 15/80 (+0.002 (0.041) cm, P = 0.853) following the second set, and increased in all conditions by 1 min following exercise (P < 0.05). In conclusion, exercise-induced hyperemia is blunted with increasing pressures of BFR. There is a modest increase in blood pressure at very low loads of resistance exercise in the upper body.
建议在非常低的负荷下，可能需要更大的血流限制（BFR）压力才能发生肌肉适应。非常低的负荷结合相对的 BFR 水平对心血管和充血反应尚不清楚。招募了 97 名参与者，并将其分配到以下 4 种运动条件之一：15%的 1 次重复最大（1RM）而没有 BFR（15/00），15%的 1RM 有 BFR 时为动脉闭塞压力（AOP）的 40%（15/40），15%的 1RM 有 BFR 时为 AOP 的 80%（15/80），以及 70%的 1RM 而没有 BFR（70/00）。参与者进行了 4 组单侧二头肌卷曲。运动前和运动后测量血压；在运动前、第二组运动后和运动后 1 分钟测量肱动脉血流。在所有条件下，收缩压在运动后均升高（增加 10（11）mmHg，P <0.0005）。除 70/00 外，舒张压均升高（增加 2（11）mmHg，P = 0.107）。在除 15/80 外的所有情况下，第二组运动后肱动脉血流增加（增加 43.4（76.8）mL·min，P = 0.348）。在运动后和袖口放气 1 分钟时，各条件之间的血流无差异（P > 0.05）。同样，除 15/80 外，在第二组运动后所有条件下动脉直径均增加（增加 0.002（0.041）cm，P = 0.853），在所有条件下运动后 1 分钟均增加（P <0.05）。总之，随着 BFR 压力的增加，运动引起的充血反应会减弱。在上肢进行非常低的抗阻运动负荷时，血压会适度升高。
