Mestrado em Nutrição e Saúde

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http://repositorio.ufes.br/handle/10/17583

Nível: Mestrado Acadêmico
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Navegando Mestrado em Nutrição e Saúde por Autor "Amaral, Joana Ferreira do"

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    Distribuição de fluidos corporais na dinâmica do ângulo de fase durante diferentes fases da perda de peso induzida pelo bypass gástrico
    (Universidade Federal do Espírito Santo, 2025-07-03) Brito, Beatriz Bobbio de; Lopes, Andressa Bolsoni; https://orcid.org/0000-0003-1244-5667; http://lattes.cnpq.br/0097480808041638; Haraguchi, Fabiano Kenji; https://orcid.org/0000-0002-1019-8888; http://lattes.cnpq.br/7280084109670510; https://orcid.org/0000-0002-6616-4994; http://lattes.cnpq.br/9622656389526243; Lopes Júnior, Luís Carlos; https://orcid.org/0000-0002-2424-6510; http://lattes.cnpq.br/5919501773501977; Amaral, Joana Ferreira do; https://orcid.org/0000-0001-8415-6333; http://lattes.cnpq.br/2800287239112001
    Introduction: The phase angle (PhA) is underexplored in severe obesity and after bariatric surgery, despite being a relevant indicator that reflects bodily and cellular changes during weight loss. Objective: This study aimed to evaluate the dynamics of the phase angle (PhA) and identify the factors associated with body composition over a 12-month period following Roux-en-Y gastric bypass (RYGB) surgery. Material and Methods: Analytical observational retrospective cohort study with male and female patients who underwent RYGB, with body composition assessed at four time points: before surgery and at 2, 6, and 12 months postoperatively. Data were analyzed using the Friedman test with a significance level of 5%. Spearman correlation and multiple linear regression were also performed. Results: From a large screened cohort, 60 patients completed the full longitudinal analysis. PhA values decreased after RYGB and stabilized over time. Weight, BMI, waist circumference, fat mass, fat-free mass, and total body water significantly decreased at each assessment point (p<0.05). PhA values were associated with the extracellular-to-intracellular water ratio (ECW:ICW ratio) at the postoperative time points (p<0.05). Conclusion: PhA values tend to decrease initially after RYGB, followed by later stabilization, with the ECW:ICW ratio being the main determinant in the postoperative period. However, given the complexity of severe obesity, other factors may also influence PhA in the preoperative period, highlighting the need for a multifactorial interpretation and future analytical studies.