Efeitos da suplementação aguda de nitrato em mulheres praticantes de exercício resistido: um estudo randomizado duplo-cego e controlado por placebo

• Ano de defesa: 2025
• Autor(a) principal: Teodoro, Rafael Correa
• Orientador(a): Silva, Sandro Fernandes da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Lavras; Faculdade de Ciências da Saúde - FCS
• Programa de Pós-Graduação: Programa de Pós-Graduação em Nutrição e Saúde
• País: brasil
• Palavras-chave em Português: Suco de Beterraba; Oxido Nítrico; Treinamento de Força; Fadiga Muscular; Ergogênicos; Beetroot Juice; Nitric Oxide; Strength Training; Muscle Fatigue; Ergogenic Aids
• Área do conhecimento CNPq: Saúde
• Link de acesso: https://repositorio.ufla.br/handle/1/60005

Nitrate supplementation has been widely studied for its potential ergogenic effects on sports performance, particularly in aerobic exercises. However, there is a gap in the literature regarding its effects on resistance training, especially in women. This study aimed to evaluate the effects of acute nitrate supplementation on women engaged in resistance exercise, including performance, physiological effects, and muscle fatigue.The study was conducted in a randomized, double-blind, placebo-controlled design, with the participation of 16 healthy women who regularly practiced resistance training. Participants performed resistance training protocols (four sets to concentric muscle failure at an intensity of 60% of one-repetition maximum, with two-minute rest intervals between sets) on the bench press and 45° leg press after ingesting either nitrate-rich beetroot juice (~12.8 mmol NO3−) or a placebo. Variables assessed included the number of repetitions, time under tension, rating of perceived exertion (RPE), heart rate (HR), blood lactate concentration, and blood pressure (BP), as well as lower limb power through the counter movement jump (CMJ) and squat jump (SJ) tests, and upper limb strength in the bench press via the maximal voluntary isometric contraction (MVIC) test. The results indicated that nitrate supplementation did not significantly improve physical performance, reduce muscle fatigue, or alter the physiological parameters analyzed. These findings contrast with previous studies that observed ergogenic effects of nitrate in other populations and exercise modalities, suggesting that factors such as hormonal and metabolic differences may influence the response to nitrate in women. Thus, it is concluded that acute nitrate supplementation did not demonstrate benefits in women's performance in resistance exercises. Future studies are needed to further investigate the effects of nitrate considering aspects such as menstrual cycle phase, dose-response relationship, and long-term supplementation protocols.