title: Baropodometric analyses of patients before and after bariatric surgery.
abstract: OBJECTIVE
  The aim of this study was to evaluate the vertical component of the ground reaction force, plantar pressure, contact area of the feet and double-support time using static and dynamic (gait) baropodometry before and after bariatric surgery.
  
  
  METHODS
  Sixteen individuals with a body mass index of between 35 and 55 were evaluated before and after bariatric surgery. Thirteen patients (81.3%) were female and three (18.8%) male and their average age was 46±10 (21-60) years. An FSCAN system (version 3848) was used for baropodometric analyses (1 km/h and 3 km/h). The peak plantar pressure and ground reaction force were measured for the rear foot and forefoot. The double-support time and foot contact area were measured during gait.
  
  
  RESULTS
  There were reductions in the ground reaction force in the forefoot and rear foot and in the foot contact area in all evaluations and of the double-support time at 3 km/h, as well as a significant reduction in the body mass index at six months post-surgery. The peak pressure did not vary at 1 km/h and at 3 km/h, reductions in peak pressure were observed in the left and right rear feet and left forefoot.
  
  
  CONCLUSIONS
  Weight loss after bariatric surgery resulted in decreases in the ground reaction force and contact area of the foot. Plantar pressure was decreased at 3 km/h, especially in the forefoot. There was an increase in rhythm because of a reduction in the double-support time at 3 km/h.
authors.affiliation: Fisiopatologia Experimental, Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Ivan Leo
authors.initials: IL
authors.lastname: Bacha
authors.affiliation: Fisiopatologia Experimental, Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Fernanda Antico
authors.initials: FA
authors.lastname: Benetti
authors.affiliation: Laboratório para o Estudo do Movimento, Departamento de Ortopedia e Traumatologia, Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Júlia Maria D'Andréa
authors.initials: JM
authors.lastname: Greve
mesh_terms: D000328:Adult; D050110:Bariatric Surgery; D001696:Biomechanical Phenomena / Q000502:physiology; D015992:Body Mass Index; D005260:Female; D005528:Foot / Q000502:physiology*; D005545:Forefoot, Human / Q000502:physiology; D005684:Gait / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009989:Orthotic Devices; D011032:Podiatry / Q000379:methods; D011312:Pressure; D015431:Weight Loss / Q000502:physiology; D055815:Young Adult