Myoelectric Activity and Fatigue in Low-Load Resistance Exercise With Different Pressure of Blood Flow Restriction: A Systematic Review and Meta-Analysis.

Autor:	de Queiros VS; Graduate Program in Health Sciences, Federal University of Rio Grande do Norte (UFRN), Natal, Brazil., de França IM; Graduate Program in Physiotherapy, Federal University of Rio Grande do Norte (UFRN), Natal, Brazil., Trybulski R; Department of Medical Sciences, The Wojciech Korfanty School of Economics, Katowice, Poland.; Provita Zory Medical Center, Zory, Poland., Vieira JG; Graduate Program in Physical Education, Federal University of Juiz de Fora (UFJF), Juiz de Fora, Brazil., Dos Santos IK; Graduate Program in Health Sciences, Federal University of Rio Grande do Norte (UFRN), Natal, Brazil., Neto GR; Graduate Program in Family Health, Faculties of Nursing and Medicine Nova Esperança (FACENE/FAMENE), João Pessoa, Brazil.; Coordination of Physical Education, University Center for Higher Education and Development (CESED/UNIFACISA/FCM/ESAC), Campina Grande, Brazil., Wilk M; Institute of Sport Sciences, Jerzy Kukuczka Academy of Physical Education in Katowice, Katowice, Poland., de Matos DG; Faculty of Kinesiology and Recreation Management, University of Manitoba, Winnipeg, MB, Canada., Vieira WHB; Graduate Program in Physiotherapy, Federal University of Rio Grande do Norte (UFRN), Natal, Brazil., Novaes JDS; Graduate Program at the School of Physical Education and Sport at the Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil., Makar P; Faculty of Physical Education, Gdańsk University of Physical Education and Sport, Gdańsk, Poland., Cabral BGAT; Graduate Program in Health Sciences, Federal University of Rio Grande do Norte (UFRN), Natal, Brazil.; Graduate Program in Physical Education, Federal University of Rio Grande do Norte (UFRN), Natal, Brazil., Dantas PMS; Graduate Program in Health Sciences, Federal University of Rio Grande do Norte (UFRN), Natal, Brazil.; Graduate Program in Physical Education, Federal University of Rio Grande do Norte (UFRN), Natal, Brazil.
Jazyk:	angličtina
Zdroj:	Frontiers in physiology [Front Physiol] 2021 Nov 22; Vol. 12, pp. 786752. Date of Electronic Publication: 2021 Nov 22 (Print Publication: 2021).
DOI:	10.3389/fphys.2021.786752
Abstrakt:	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, I 2 = 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]. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2021 de Queiros, de França, Trybulski, Vieira, dos Santos, Neto, Wilk, Matos, Vieira, Novaes, Makar, Cabral and Dantas.)
Databáze:	MEDLINE
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