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Quality of Life, BMI, and Physical Activity in Bariatric Surgery Patients: a Structural Equation Model
Lara Belmudes Bottcher1, Paulo Felipe Ribeiro Bandeira2, Nélio Barreto Vieira3
1Stricto Sensu Program in Health Sciences at Centro Universitário Saúde ABC, Faculdade de Medicina do ABC (FMABC), Av. Lauro Gomes, 2000-Vila Sacadura Cabral, Santo André, SP, 09060-870, Brazil. larabottcher@hotmail.com.
Purpose:
The purpose of this study was to use a structural equation model to clarify how physical activity (PA), sex, and BMI relate to quality of life (QoL) of post-bariatric surgery patients.
Methods:
The study had a retrospective cohort design for a convenience sample population of 886 bariatric subjects (38 ± 8.49 years). QoL was assessed using World Health Organization Quality of Life-BREF, PA using the International Physical Activity Questionnaire, and BMI values were calculated. Structural equation analysis was conducted in Mplus.
Results:
The physical domain presented positive relationships with BMI (p = 0.014) and the very active group and negative with the insufficiently active A and B groups and sex (p < 0.001). The psychological domain presented negative associations with BMI and the very active group and positive with the insufficiently active A group. The social relations domain presented negative associations with BMI (p < 0.009) and the very active group (p < 0.002) and positive with the insufficiently active A (p < 0.007) and B (p < 0.019) groups. The environmental domain was negatively associated with BMI (p < 0.004) and the very active group (p < 0.001) and positively with the insufficiently active B group (p < 0.049) and sex (p < 0.018).
Conclusion:
BMI is a negative predictor of QoL in bariatric patients and this trend was not observed in the physical domain only; also, the very active group was negatively associated with QoL. We believe that distortions in body weight/body size extend to PA, and research is needed to explore the psychological factors underlying the overestimation of the amount of PA performed.
