Efeito do treinamento de força com restrição de fluxo sanguíneo, com pressões fixa e ajustável, sobre a pressão de oclusão arterial e desempenho neuromuscular em homens: ensaio clínico aleatorizado

• Autor(a) principal: Silva, Hidayane Gonçalves da
• Data de Publicação: 2023
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/123456789/29681
• topic: Treinamento de força - Exercício físico; Treino de força - Pressão sanguínea; Isquemia vascular; Oclusão terapêutica; Strength training - Physical exercise; Strength Training – Blood Pressure; Vascular ischemia; Therapeutic occlusion; Oclusión terapéutica; CNPQ::CIENCIAS DA SAUDE::EDUCACAO FISICA

Introduction: Strength training with blood flow restriction (BFR) is a method that is based on the use of low loads, using inflatable cuffs or tourniquets, in the proximal region of the upper or lower limbs, in order to reduce blood flow. artery and obstruct venous return, aiming to promote increased strength and muscle mass. However, knowledge gaps are still observed when referring to chronic adaptations of arterial occlusion pressure (AOP) and neuromuscular performance, seeking the need to adjust or not the AOP during a strength training program with BFR. Objective: To analyze the effects of low-load strength training, with restriction pressures (fixed, adjustable and 0%), for 12 weeks, on AOP and neuromuscular performance, in the upper and lower limbs, in healthy young men. Materials and Methods: The study included 21 young men (18 to 35 years old), divided into 3 experimental groups: G1: LI+ BFR /50% of the fixed AOP (upper and lower limbs; n=7); G2: LI+ BFR/50% of the adjustable AOP (upper and lower limbs; n=7) and; G3: LI/0% of the AOP (upper and lower limbs; n=7), who performed low load strength training with and without BFR. The protocols consisted of 4 sets of 15 repetitions, with 30 seconds of rest between sets, at 30% of 1RM, in exercise for the upper-body and exercise for the lower-body. To this end, subjects in the BFR groups used a standard pressure sphygmomanometer for BFR, which remained inflated during the exercise protocol. The group that trained with 50% of the fixed AOP continued training using the initial occlusion pressure, while the group that trained with 50% of the adjustable AOP underwent modifications according to the verified occlusion pressure, at the end of each week of training. Results: Comparing the AOP in the upper limb (L) and lower limbs (R and L), both in the fixed LI+BFR group and in the LI+BFR adjustable group, it behaved similarly (P>0.05), however, both protocols showed increases in AOP when compared to the LI group (P<0.05). With the exception, only in the 6th week, that there was an increase in the upper limb (R) AOP in the fixed LI+BFR and adjustable LI+BFR group (P<0.05). As for the dynamic muscle strength and localized muscular resistance (LMR), in the upper and lower limbs (R and L), it was observed that there was no significant difference between the analyzed groups: fixed, adjustable and 0% AOP (P>0.05). However, in the intragroup comparison, a significant increase was observed in all groups at the 6th and 12th weeks (P<0.05). Conclusion: The results of the present study show that the LI+BFR fixed or adjustable promoted similar changes in AOP, muscle strength and LMR, in the upper and lower limbs (R and L), in healthy men, despite the increase presented in AOP only in the 6th week in the upper limb (R). Therefore, it does not seem necessary to adjust the AOP over 12 weeks of LI with BFR in these subjects.