Department of Health, Human Performance, and Recreation, Southeast Missouri State University, Cape Girardeau, Missouri, USA.
J Strength Cond Res. 2010 Oct;24(10):2831-4. doi: 10.1519/JSC.0b013e3181f0ac3a.
Training at low intensities with moderate vascular occlusion results in increased muscle hypertrophy, strength, and endurance. Elastic knee wraps, applied to the proximal portion of the target muscle, might elicit a stimulus similar to the KAATSU Master Apparatus. The purpose of this study was to test the hypothesis that intermittently occluding the leg extensors with elastic knee wraps would increase whole-blood lactate (WBL) over control (CON). Twelve healthy men and women participated in this study (age 21.2 ± 0.35 years, height 168.9 ± 2.60 cm, and body mass 71.2 ± 4.16 kg). One repetition maximum (1RM) testing for the leg extensors was performed on a leg extension machine for the first trial, followed by occlusion (OCC) and CON trials. Four sets of leg extension exercise (30-15-15-15) were completed with 150-second rest between sets at 30% 1RM. Whole-blood lactate, heart rate (HR), and ratings of perceived exertion (RPEs) were measured after every set of exercise and 3 minutes postexercise. Data were analyzed using repeated-measures analysis of variance with statistical significance set at p ≤ 0.05. Whole-blood lactate increased in response to exercise (p = 0.01) but was not different between groups (OCC 6.28 ± 0.66 vs. CON 5.35 ± 0.36 mmol·L, p = 0.051). Heart rate (OCC 128.86 ± 4.37 vs. CON 119.72 ± 4.10 b·min⁻¹) was higher with OCC from sets 2-4 (p ≤ 0.03), with no difference 3 minutes postexercise (p = 0.29). Rating of perceived exertion was higher with OCC after every set (OCC 15.10 ± 0.31 vs. CON 12.16 ± 0.50, p = 0.01). In conclusion, no differences exist for WBL between groups, although there was a trend for higher levels with OCC. The current protocol for practical occlusion did not significantly increase metabolic stress more than normal low-intensity exercise. This study does not support the use of knee wraps as a mode of blood-flow restriction.
低强度训练结合中等血管闭塞可导致肌肉肥大、力量和耐力增加。弹性护膝，应用于目标肌肉的近端部分，可能会产生类似于 KAATSU 大师器械的刺激。本研究的目的是验证以下假设：用弹性护膝间歇性地阻断腿部伸展肌会使全血乳酸（WBL）升高，超过对照（CON）水平。12 名健康男性和女性参与了这项研究（年龄 21.2±0.35 岁，身高 168.9±2.60cm，体重 71.2±4.16kg）。第一次试验时，在腿部伸展机上进行腿部伸展器的最大重复次数（1RM）测试，然后进行闭塞（OCC）和 CON 试验。在 30%1RM 的情况下，用 150 秒的休息时间完成 4 组腿部伸展运动（30-15-15-15）。每次运动后和运动后 3 分钟测量全血乳酸、心率（HR）和感知用力程度（RPE）。使用重复测量方差分析分析数据，统计显著性设为 p≤0.05。全血乳酸因运动而增加（p=0.01），但两组之间无差异（OCC 6.28±0.66 与 CON 5.35±0.36mmol·L，p=0.051）。OCC 时心率（OCC 128.86±4.37 与 CON 119.72±4.10b·min⁻¹）在第 2-4 组更高（p≤0.03），运动后 3 分钟无差异（p=0.29）。每次运动后 OCC 的感知用力程度更高（OCC 15.10±0.31 与 CON 12.16±0.50，p=0.01）。总之，两组之间的 WBL 没有差异，尽管 OCC 时有升高的趋势。目前的实际闭塞方案并没有显著增加代谢应激，超过正常的低强度运动。本研究不支持将护膝用作血流限制的模式。
