背景:具有血流限制(BFR)的低负荷阻力运动(LL-RE)促进代谢反应和疲劳增加,以及比传统LL-RE更明显的肌电活动。一些研究表明,运动过程中施加的相对压力可能会对这些变量产生影响,但是现有的证据是矛盾的。目的:本研究的目的是系统地回顾和汇集有关不同BFR压力下LL-RE的神经肌肉和代谢反应差异的可用证据。方法:根据PRISMA项目进行系统评价和荟萃分析。在以下数据库中进行了搜索:CINAHL,PubMed,Scopus,SPORTDiscus和WebofScience,直到2021年6月15日。分析LL-RE的随机或非随机实验研究,与至少两个相对BFR压[动脉闭塞压(AOP)%]相关,关于肌电活动,疲劳,或包括代谢反应。对MVC扭矩(疲劳测量)和肌电活动进行随机效应荟萃分析。使用PEDro量表评估证据质量。结果:共纳入10项研究,全部具有中等到较高的方法学质量。对于MVC扭矩,在40-50%与40%的运动之间的比较中没有差异。80-90%AOP。在分析荟萃分析数据时,结果表明,在运动中,最大重复15-20%(1RM)的比较存在差异,更高的限制压力引起更大的MVC扭矩下降(4种干预措施,73名参与者;MD=-5.05Nm[95CI=-8.09;-2.01],p=0.001,I2=0%)。对于肌电活动,荟萃分析表明,运动与40%之间存在差异。60%AOP(3种干预措施,38名参与者;SMD=0.47[95CI=0.02;0.93],p=0.04,I2=0%),更高的限制压力会导致更大的肌电活动。在40%与40%之间的比较中未发现此结果。80%AOP。在分析采用预定义重复方案的研究时,发现差异(4种干预措施,52名参与者;SMD=0.58[95CI=0.11;1.05],p=0.02,I2=27%)。结论:LL-RE期间施加的BFR压力可能会影响肌肉疲劳和兴奋性的幅度,当规定1RM的15%至20%之间的负荷和预定义的重复方案(非失败)时,分别。系统审查注册:[http://www。crd.约克。AC.英国/普华永道],标识符[CRD42021229345]。
Background: Low-load resistance exercise (LL-RE) with blood flow restriction (BFR) promotes increased metabolic response and fatigue, as well as more pronounced myoelectric activity than traditional LL-RE. Some studies have shown that the relative pressure applied during exercise may have an effect on these variables, but existing evidence is contradictory. Purpose: The aim of this study was to systematically review and pool the available evidence on the differences in neuromuscular and metabolic responses at LL-RE with different pressure of BFR. Methods: The systematic review and meta-analysis was reported according to PRISMA items. Searches were performed in the following databases: CINAHL, PubMed, Scopus, SPORTDiscus and Web of Science, until June 15, 2021. Randomized or non-randomized experimental studies that analyzed LL-RE, associated with at least two relative BFR pressures [arterial occlusion pressure (AOP)%], on myoelectric activity, fatigue, or metabolic responses were included. Random-effects meta-analyses were performed for MVC torque (fatigue measure) and myoelectric activity. The quality of evidence was assessed using the PEDro scale. Results: Ten studies were included, all of moderate to high methodological quality. For MVC torque, there were no differences in the comparisons between exercise with 40-50% vs. 80-90% AOP. When analyzing the meta-analysis data, the results indicated differences in comparisons in exercise with 15-20% 1 repetition maximum (1RM), with higher restriction pressure evoking greater MVC torque decline (4 interventions, 73 participants; MD = -5.05 Nm [95%CI = -8.09; -2.01], p = 0.001, I 2 = 0%). For myoelectric activity, meta-analyses indicated a difference between exercise with 40% vs. 60% AOP (3 interventions, 38 participants; SMD = 0.47 [95%CI = 0.02; 0.93], p = 0.04, I2 = 0%), with higher pressure of restriction causing greater myoelectric activity. This result was not identified in the comparisons between 40% vs. 80% AOP. In analysis of studies that adopted pre-defined repetition schemes, differences were found (4 interventions, 52 participants; SMD = 0.58 [95%CI = 0.11; 1.05], p = 0.02, I 2 = 27%). Conclusion: The BFR pressure applied during the LL-RE may affect the magnitude of muscle fatigue and excitability when loads between 15 and 20% of 1RM and predefined repetition protocols (not failure) are prescribed, respectively. Systematic Review Registration: [http://www.crd.york.ac.uk/prospero], identifier [CRD42021229345].