title: Body composition changes in adolescents after laparoscopic sleeve gastrectomy.
abstract: BACKGROUND
  Sleeve gastrectomy (SG) is a commonly used bariatric procedure in severely obese adolescents. Weight loss after SG is associated with marked changes in body composition, but factors associated with such changes have not yet been described in adolescents.
  
  
  OBJECTIVE
  To identify factors associated with changes in body weight and composition in adolescents 1 year after SG.
  
  
  METHODS
  University Hospital, Tel Hashomer, Israel.
  
  
  METHODS
  Age, sex, weight, height, preoperative body mass index (BMI), and body fat percent measured by bioimpedance were collected in 25 adolescents (16 males, 9 females, age 16.6±1.5 yr) before and 1 year after SG. Obesity-related complications, preoperative weight loss, and physical activity after surgery were also recorded. Repeated-measures analyses of variance and linear mixed model analyses were performed.
  
  
  RESULTS
  One year after SG, weight decreased by 32%, fat mass by 55%, and fat-free mass by 9% from baseline. Male participants lost significantly more weight than female participants, with larger decreases in fat mass (-65% versus -41%, P<.001) and body fat percent (-48% versus -21%, P<.001). The amount of physical activity at 1-year follow-up was also associated with larger reductions in body fat percent in both genders. Age or baseline BMI, fat mass, and fat-free mass were not associated with changes in BMI or body composition.
  
  
  CONCLUSIONS
  Among obese adolescents 1 year after SG, the only modifiable factor associated with larger decreases in body fat percent was physical activity. Larger studies are needed to formally identify other possible predictors of body composition changes after SG.
authors.affiliation: Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel. Electronic address: gal.dubnov-raz@sheba.health.gov.il.
authors.forename: Gal
authors.initials: G
authors.lastname: Dubnov-Raz
authors.affiliation: Pediatric General & Thoracic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio.
authors.forename: Thomas H
authors.initials: TH
authors.lastname: Inge
authors.affiliation: Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel.
authors.forename: Michal
authors.initials: M
authors.lastname: Ben-Ami
authors.affiliation: Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel.
authors.forename: Reut
authors.initials: R
authors.lastname: Pienik
authors.affiliation: Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel.
authors.forename: Irena
authors.initials: I
authors.lastname: Vusiker
authors.affiliation: Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel.
authors.forename: Dani
authors.initials: D
authors.lastname: Yardeni
mesh_terms: D000293:Adolescent; D001823:Body Composition; D015992:Body Mass Index; D005260:Female; D005500:Follow-Up Studies; D015391:Gastroplasty / Q000379:methods*; D006801:Humans; D010535:Laparoscopy / Q000379:methods*; D008297:Male; D009767:Obesity, Morbid / Q000503:physiopathology / Q000601:surgery*; D011184:Postoperative Period; D013997:Time Factors; D015431:Weight Loss / Q000502:physiology*
keywords: Bariatric; Fat; Fat percent; Surgery; Youth