Gray Sylvie M, Cuomo Amanda M, Proppe Christopher E, Traylor Miranda K, Hill Ethan C, Keller Joshua L
Integrated Laboratory of Exercise and Applied Physiology (iLEAP), Department of Health, Kinesiology and Sport, College of Education and Professional Studies, University of South Alabama, Mobile, AL.
Division of Kinesiology, School of Kinesiology and Physical Therapy, University of Central Florida, Orlando, FL.
Med Sci Sports Exerc. 2023 May 1;55(5):920-931. doi: 10.1249/MSS.0000000000003103. Epub 2022 Dec 13.
The purpose of this study was to examine the physiological responses resulting from an acute blood flow restriction resistance exercise bout with two different cuff pressures in young, healthy men and women.
Thirty adults (18-30 yr) completed a bilateral leg extension blood flow restriction bout consisting of four sets (30-15-15-15 repetitions), with cuffs applied at pressures corresponding to 40% and 60% of the minimum arterial occlusion pressure (AOP) needed to completely collapse the femoral arteries. During each of these conditions (40% and 60% AOP), physiological measures of near-infrared spectroscopy (NIRS) and EMG amplitude (EMG AMP) were collected from the dominant or nondominant vastus lateralis. After each set, ratings of perceived exertion (RPE) were collected, whereas only at baseline and at the end of the bout, mean arterial pressure (MAP) was assessed. Separate mixed-factorial ANOVA models were used to examine mean differences in the change in EMG AMP and NIRS parameters during each set. The absolute RPE and MAP values were also examined with separate ANOVAs. A P value ≤0.05 was considered statistically significant.
Regardless of sex or cuff pressure, the change in EMG AMP was lower in set 1 (14.8%) compared with the remaining sets (22.6%-27.0%). The 40% AOP condition elicited the greatest changes in oxy[heme] and deoxy[heme], while also providing lower RPEs. For MAP, there was an effect for time such that MAP increased from preexercise (87.5 ± 4.3 mm Hg) to postexercise (104.5 ± 4.1 mm Hg).
The major findings suggested that the 40% AOP condition permitted the greatest amount of recovery during the interset rest. In addition, there did not seem to be any meaningful sex-related difference in this sample of young healthy adults.
本研究旨在探讨在年轻健康男性和女性中，进行一次急性血流限制抗阻运动组，采用两种不同袖带压力时所产生的生理反应。
30名成年人（18 - 30岁）完成了一组双侧腿部伸展血流限制运动，包括四组（30 - 15 - 15 - 15次重复），袖带压力对应为完全压迫股动脉所需最小动脉闭塞压（AOP）的40%和60%。在每种情况（40% AOP和60% AOP）下，从优势或非优势股外侧肌收集近红外光谱（NIRS）和肌电图幅度（EMG AMP）的生理测量数据。每组运动后，收集主观用力程度（RPE）评分，而仅在基线和运动组结束时评估平均动脉压（MAP）。使用单独的混合因素方差分析模型来检验每组运动期间EMG AMP和NIRS参数变化的平均差异。还通过单独的方差分析检验绝对RPE和MAP值。P值≤0.05被认为具有统计学意义。
无论性别或袖带压力如何，与其余几组（22.6% - 27.0%）相比，第1组的EMG AMP变化较低（14.8%）。40% AOP情况引起氧合血红蛋白和脱氧血红蛋白的最大变化，同时主观用力程度评分也较低。对于MAP，存在时间效应，使得MAP从运动前（87.5±4.3 mmHg）增加到运动后（104.5±4.1 mmHg）。
主要研究结果表明，40% AOP情况在组间休息期间允许最大程度的恢复。此外，在这个年轻健康成年人样本中，似乎没有任何有意义的性别相关差异。
