title: Objective quantification of physical activity in bariatric surgery candidates and normal-weight controls.
abstract: BACKGROUND
  Physical activity (PA) is an important component of weight loss programs and should be encouraged for severely obese patients undergoing bariatric surgery. However, few studies have determined the amount and intensity of activities undertaken preoperatively by bariatric surgery patients using objective measures.
  
  
  METHODS
  Using RT3 tri-axial accelerometers, the present study compared 38 bariatric surgery candidates and 20 normal weight controls on activity counts/hr; the number of minutes daily spent in moderate-to-vigorous intensity PA (MVPA) and vigorous intensity PA; and the level of compliance with national recommendations to accumulate 150 min/wk of MVPA in bouts of > or = 10 minutes.
  
  
  RESULTS
  Surgery candidates, compared with controls, recorded significantly (P <.01) fewer activity counts/hr (13,799 +/- 3758 counts/hr versus 19,462 +/- 4259 counts/hr) and spent fewer minutes per day engaged in MVPA (26.4 +/- 23.0 min/d versus 52.4 +/- 24.7 min/d) and vigorous PA (1.2 +/- 3.4 min/d vs 11.8 +/- 9.0 min/d). More than two thirds (68%) of the surgery candidates versus 13% of the normal weight controls did not accumulate any MVPA in bouts of > or = 10 minutes and only 4.5% of obese patients met the weekly MVPA recommendation versus 40% of the controls.
  
  
  CONCLUSIONS
  The results of our study have shown that bariatric surgery candidates have low PA levels and rarely engage in PA bouts of sufficient duration and intensity to maintain and improve health. Additional research is needed to determine how best to increase PA in bariatric surgery candidates.
authors.affiliation: Department of Psychiatry and Human Behavior, Warren Alpert Medical School of Brown University, The Miriam Hospital/Weight Control and Diabetes Research Center, Providence, Rhode Island 02903, USA. dbond@lifespan.org
authors.forename: Dale S
authors.initials: DS
authors.lastname: Bond
authors.forename: John M
authors.initials: JM
authors.lastname: Jakicic
authors.forename: Sivamainthan
authors.initials: S
authors.lastname: Vithiananthan
authors.forename: J Graham
authors.initials: JG
authors.lastname: Thomas
authors.forename: Tricia M
authors.initials: TM
authors.lastname: Leahey
authors.forename: Harry C
authors.initials: HC
authors.lastname: Sax
authors.forename: Dieter
authors.initials: D
authors.lastname: Pohl
authors.forename: G D
authors.initials: GD
authors.lastname: Roye
authors.forename: Beth A
authors.initials: BA
authors.lastname: Ryder
authors.forename: Rena R
authors.initials: RR
authors.lastname: Wing
mesh_terms: D000293:Adolescent; D000328:Adult; D050110:Bariatric Surgery; D005260:Female; D015438:Health Behavior; D006801:Humans; D008297:Male; D008875:Middle Aged; D018670:Monitoring, Ambulatory / Q000295:instrumentation; D009043:Motor Activity; D009767:Obesity, Morbid / Q000523:psychology* / Q000601:surgery; D057234:Preoperative Period; D055815:Young Adult