Efeito da suplementação com beta-alanina associada ao treinamento de força tradicional ou com restrição do fluxo sanguíneo na força e hipertrofia muscular.

• Ano de defesa: 2019
• Autor(a) principal: PESSÔA, Kassiana de Araujo
• Orientador(a): ZANCHI, Nelo Eidy
• Banca de defesa: ZANCHI, Nelo Eidy , PAES, Antonio Marcus de Andrade , CABIDO, Christian Emmanuel Torres , VENEROSO, Christiano Eduardo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Maranhão
• Programa de Pós-Graduação: PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIAS DA SAÚDE/CCBS
• Departamento: DEPARTAMENTO DE BIOLOGIA/CCBS
• País: Brasil
• Palavras-chave em Português: Beta-alanina; Suplementação nutricional; Treinamento de força; Restrição do fluxo sanguíneo
• Palavras-chave em Inglês: Beta-alanine; Nutritional supplementation; Strength training; Blood flow restriction
• Área do conhecimento CNPq: Fisiologia do Esforço
• Link de acesso: https://tedebc.ufma.br/jspui/handle/tede/2677

Introduction: Beta-alanine supplementation has been utilized as an important nutritional supplement, being able to induce increased ergogenesis. Search in the literature has demonstrated positive results through this supplementation, via increased carnosine content and decreased intracellular acidosis, thus favoring anaerobic glycolysis. Traditional strength training (TRAD) or blood flow restriction resistance training (BFR) modalities, depend on the anaerobic system for energy production. Such metabolic characteristics make supplements with buffering properties, excellent alternatives for increasing performance. Theoretically, the ergogenic effects of beta-alanine supplementation, during TRAD or BFR, would lead to increased muscle hypertrophy, since mechanical work is a determinant of muscle mass gains. In addition, by vascular restriction during BFR exercises, intracellular buffers (such as carnosine) would be of greater importance when compared to extracellular ones. Such mechanisms make not only TRAD, but especially BFR, candidates for the benefitial effects of chronic beta-alanine supplementation, on performance and muscle hypertrophy outcomes. Objective: To verify the effects of beta-alanine supplementation on muscle strength and hypertrophy after traditional strength training or blood flow restriction. Materials and Methods: Twenty healthy male volunteers, untrained, between 18 and 30 years old, were randomly assigned to a placebo (n = 10) or beta-alanine (n = 10) group. Volunteers from both groups were unilaterally trained (unilateral training) for 6 weeks, and each arm was trained using a different training model. The mean of anthropometry, skinfolds and food record of three days were evaluated. In addition, they were submitted to a maximal repetition test (1RM), and muscular thickness measurements performed before and after the strength training program. Results: The total weight lifted was calculated (repetitions × weight lifted × series) for the entire strength training program. For the BFR paradigm there were increases in muscle thickness (BFR: Pre = 0,3 ± 0,1 and Post = 8,3 ± 3,9 mm in relation to TRAD: Pre = 0,1 ± 0,1 and Post = 4,3 ± 3,6 mm, p <0,001) when compared to TRAD. On the other hand, beta-alanine supplementation did not reveal significant additional increases for both paradigms (p = 0.080). Conclusion: We conclude that at 6 weeks, BFR induced a greater effect of muscle hypertrophy when compared to TRAD. Beta-alanine supplementation has not been shown to be ergogenic or anabolic for any of the training models TRAD or BFR. Studies with longer intervention periods will be needed to uncover the additional effects of beta-alanine supplementation for both training.