[Physical exercise and loss of weight and body mass index in bariatric surgery: a systematic review].

Introduction: bariatric surgery is considered successful when the percentage of weight loss is equal to or higher than 25 %, or when the percentage loss of body mass index occurs above 50 % long-term. Objective: to analyze the effect of physical exercise on body weight and body mass index before and/or after bariatric surgery. Methodology: articles registered in the PudMed, Scopus and Web of Science databases were searched for original papers with open access in English and Spanish that compared one or more physical exercise programs as treatment before and/or after bariatric surgery, with results on initial and final weight and body mass index, muscle mass, and fat mass from January to April 2021.