title: Changes in physical activity after bariatric surgery: using objective and self-reported measures.
abstract: BACKGROUND
  Many studies using self-reported physical activity (PA) assessment tools have suggested there is an increase in PA after bariatric surgery.
  
  
  OBJECTIVE
  Our aim was to assess PA and sedentary behavior before bariatric surgery and at 6 months after, using subjective and objective tools.
  
  
  METHODS
  Bariatric surgery candidates were recruited from a single center.
  
  
  METHODS
  Demographic data, medical history, current medications, and anthropometric measurements were recorded. Participants were asked to complete a PA and lifestyle questionnaire and to wear an accelerometer on their nondominant wrist. Data were collected before and at 6 months after surgery.
  
  
  RESULTS
  Twenty-two participants were included (17 gastric bypass; 4 sleeve gastrectomy; 1 intragastric balloon). Mean age was 46 years and the majority were female (72%). At a median of 6.3 months follow-up, there were significant reductions in measures of body fatness with a mean reduction of 27 kg in weight. The majority of daytime (12.5±1.1 out of 16 h) was spent in sedentary behavior presurgery with little change postsurgery (12.2±1.2; P = .186). Objectively measured mean moderate-vigorous PA did not change significantly from pre- to postsurgery (mean 11.5±13.9 and 11.6±13.1 min/d, respectively; P = .971). Self-reported total nonoccupational PA did not change significantly (P = .390).
  
  
  CONCLUSIONS
  The majority of bariatric surgery candidates were physically inactive presurgery, and there was no significant change in either subjectively or objectively measured PA at follow-up. This patient group may benefit from objective PA assessment and interventions aimed at increasing PA.
authors: Human Nutrition Research Centre, Institute of Cellular Medicine, Newcastle University, Campus for Ageing and Vitality, Newcastle on Tyne, UK; Northumbria Healthcare NHS Foundation Trust, North Tyneside General Hospital, North Shields, UK. Electronic address: s.afshar@doctors.org.uk.
authors: Sorena
authors: S
authors: Afshar
authors: Northumbria Healthcare NHS Foundation Trust, North Tyneside General Hospital, North Shields, UK.
authors: Keith
authors: K
authors: Seymour
authors: Northumbria Healthcare NHS Foundation Trust, North Tyneside General Hospital, North Shields, UK.
authors: Seamus B
authors: SB
authors: Kelly
authors: Northumbria Healthcare NHS Foundation Trust, North Tyneside General Hospital, North Shields, UK.
authors: Sean
authors: S
authors: Woodcock
authors: Netherlands eScience Center, Amsterdam, The Netherlands.
authors: Vincent T
authors: VT
authors: van Hees
authors: Human Nutrition Research Centre, Institute of Cellular Medicine, Newcastle University, Campus for Ageing and Vitality, Newcastle on Tyne, UK.
authors: John C
authors: JC
authors: Mathers
mesh_terms: D061725:Accelerometry; D050110:Bariatric Surgery; D015992:Body Mass Index; D015444:Exercise / Q000502:physiology*; D006304:Health Status; D006801:Humans; D008875:Middle Aged; D018670:Monitoring, Ambulatory; D011182:Postoperative Care; D011300:Preoperative Care; D057185:Sedentary Behavior; D057566:Self Report; D011795:Surveys and Questionnaires; D055815:Young Adult
keywords: Accelerometer; Bariatric surgery; Physical activity; Sedentary behavior