Department of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA.
Med Sci Sports Exerc. 2010 Jul;42(7):1296-302. doi: 10.1249/MSS.0b013e3181ca7b06.
Previous studies have shown that resistance training with restricted venous blood flow (Kaatsu) results in significant strength gains and muscle hypertrophy. However, few studies have examined the concurrent vascular responses following restrictive venous blood flow training protocols.
The purpose of this study was to examine the effects of 4 wk of handgrip exercise training, with and without venous restriction, on handgrip strength and brachial artery flow-mediated dilation (BAFMD).
Twelve participants (mean +/- SD: age = 22 +/- 1 yr, men = 5, women = 7) completed 4 wk of bilateral handgrip exercise training (duration = 20 min, intensity = 60% of the maximum voluntary contraction, cadence = 15 grips per minute, frequency = three sessions per week). During each session, venous blood flow was restricted in one arm (experimental (EXP) arm) using a pneumatic cuff placed 4 cm proximal to the antecubital fossa and inflated to 80 mm Hg for the duration of each exercise session. The EXP and the control (CON) arms were randomly selected. Handgrip strength was measured using a hydraulic hand dynamometer. Brachial diameters and blood velocity profiles were assessed, using Doppler ultrasonography, before and after 5 min of forearm occlusion (200 mm Hg) before and at the end of the 4-wk exercise.
After exercise training, handgrip strength increased 8.32% (P = 0.05) in the CON arm and 16.17% (P = 0.05) in the EXP arm. BAFMD increased 24.19% (P = 0.0001) in the CON arm and decreased 30.36% (P = 0.0001) in the EXP arm.
The data indicate handgrip training combined with venous restriction results in superior strength gains but reduced BAFMD compared with the nonrestricted arm.
先前的研究表明，限制静脉血流（Kaatsu）的阻力训练会导致显著的力量增长和肌肉肥大。然而，很少有研究检查过限制静脉血流训练方案后的并发血管反应。
本研究的目的是检查 4 周的握力训练，有无静脉限制，对握力强度和肱动脉血流介导的扩张（BAFMD）的影响。
12 名参与者（平均 +/- SD：年龄=22 +/- 1 岁，男性=5，女性=7）完成了 4 周的双侧握力训练（持续时间=20 分钟，强度=最大自主收缩的 60%，节拍=每分钟 15 次握力，频率=每周 3 次）。在每次训练中，通过在肘前窝近端 4 cm 处放置一个气压袖带，将静脉血流限制在一只手臂（实验（EXP）臂）中，袖带充气至 80 mmHg，持续整个训练过程。EXP 和对照（CON）臂被随机选择。握力使用液压测力计测量。在 4 周运动前和运动结束时，使用多普勒超声评估前臂闭塞（200 mmHg）前和后的肱动脉直径和血流速度曲线。
运动训练后，CON 臂的握力增加了 8.32%（P=0.05），EXP 臂的握力增加了 16.17%（P=0.05）。CON 臂的 BAFMD 增加了 24.19%（P=0.0001），EXP 臂的 BAFMD 降低了 30.36%（P=0.0001）。
数据表明，与非限制臂相比，握力训练结合静脉限制会导致更强的力量增长，但 BAFMD 降低。
