Department of Nutrition, Food and Exercise Sciences, Florida State University, Tallahassee, Florida, USA.
Scand J Med Sci Sports. 2011 Jun;21(3):431-6. doi: 10.1111/j.1600-0838.2009.01061.x. Epub 2010 Jan 31.
High-intensity resistance exercise may acutely increase arterial stiffness. Vascular occlusion (VO) acutely decreases arterial stiffness. The purpose of this study was to evaluate acute aortic hemodynamic responses to low-intensity resistance exercise (LIRE) with slow eccentric movement with and without VO. Twenty-three young healthy subjects (12 women and 11 men) were randomized into three trials: seated control (CON), LIRE (six sets at 40% one repetition maximum), and LIRE with VO. Vascular measurements were assessed before, immediately (post1), and 30 min after (post30) each trial. There were significant (P<0.05) time effects and trial-by-time interactions such that the changes were greater after the LIRE trials compared with CON. Aortic blood pressure [systolic (∼10 mmHg) and diastolic (∼5 mmHg)], heart rate (∼23 b.p.m.), and the first (∼10 mmHg) and second systolic peak (∼9 mmHg) increased, whereas time to reflection decreased (∼15 ms) at post1. All measurements returned to baseline at post30, except aortic augmentation index (AIx), which decreased ∼5% after the LIRE trials compared with CON. Increases in cardiovascular variables immediately after the LIRE trials were mild and short lasting. Our results indicate that LIRE acutely decreases AIx 30 min after exercise cessation. The use of moderate intermittent VO during LIRE does not produce additional post-exercise vascular effects.
高强度抗阻运动可能会使动脉僵硬度急性增加。血管闭塞(VO)可使动脉僵硬度急性降低。本研究旨在评估低强度抗阻运动(LIRE)与缓慢离心运动结合和不结合 VO 对主动脉血流动力学的急性反应。23 名年轻健康受试者(12 名女性和 11 名男性)被随机分为三组:坐姿对照组(CON)、LIRE 组(6 组,每组 40%的一次重复最大量)和 LIRE 结合 VO 组。在每个试验之前、立即(post1)和 30 分钟后(post30)评估血管测量值。有显著的(P<0.05)时间效应和试验间的相互作用,即 LIRE 试验后的变化大于 CON。主动脉血压[收缩压(约 10mmHg)和舒张压(约 5mmHg)]、心率(约 23 bpm)和第一(约 10mmHg)和第二收缩峰(约 9mmHg)增加,而反射时间在 post1 时减少(约 15ms)。所有测量值在 post30 时均恢复到基线,除了主动脉增强指数(AIx),与 CON 相比,LIRE 试验后 AIx 降低了约 5%。LIRE 试验后即刻心血管变量的增加是轻微且短暂的。我们的结果表明,LIRE 在运动停止后 30 分钟内急性降低 AIx。在 LIRE 中使用适度的间歇性 VO 不会产生额外的运动后血管效应。