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Made available in DSpace on 2022-04-28T19:43:40Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01 Background: Resistance training has proven to be an excellent method for counteracting aging physical dysfunctions. However, its application in the liquid environment is not yet fully elucidated. Aim: To investigate the effects of water-based resistance training (WBRT) with the concentric phase performed as fast as possible, compared to conventional resistance training (CRT), on physical functional capacity, muscle strength, and body composition in older women. Methods: Thirteen healthy older women participated in the WBRT and 11 in the CRT. Estimation statistics focused on the effect size of the experiment/intervention were used. We also analyzed the intervention effect based on the percentage delta between WBRT and CRT. Results: The WBRT group showed a negative large effect (d = − 0.922; p = 0.0274) for the timed up and go, and a large effect for chair rise in 30″ and the elbow flex test (d = 1.58; p = 0.0012; d = 2.8; p = 0.01) respectively. Intervention comparisons based on the delta percentage between WBRT and CRT presented an intermediate effect (d = 0.606; p = 0.157) for the stair climb, a large effect (d = 0.988; p = 0.0282) for the timed up and go, and a large negative effect [d = − 1.32 (90.0% CI − 1.92, − 0.646); p = 0.0038] for the elbow flex test. Concentric extensor-flexor peak torque (60°/s) showed an intermediate effect (d = 0.749; p = 0.0876; d = 0.65; p = 0.122 respectively). Body fat (%) demonstrated an intermediate effect (d = 0.523; p = 0.234). Conclusion: WBRT with the concentric phase performed as fast as possible was able to improve physical functional capacity and maximal knee extension strength of older women. Laboratório de Estudo do Desempenho Humano Universidade Federal do Amazonas, Av. Gen. Rodrigo Otávio. 5614, Coroado Programa de Pós Graduação Stricto Sensu em Ciências do Movimento Humano Faculdade de Educação Física e Fisioterapia Universidade Federal do Amazonas Projeto de Extensão Universidade Aberta da Terceira Idade Universidade Federal do Amazonas Centro de Estudo e Laboratório de Avaliação e Prescrição de Atividade Motora Universidade Estadual Paulista Centro de Estudo e Laboratório de Avaliação e Prescrição de Atividade Motora Universidade Estadual Paulista