title: Pre- to postoperative physical activity changes in bariatric surgery patients: self report vs. objective measures.
abstract: Bariatric surgery patients report significant pre- to postoperative increases in physical activity (PA). However, it is unclear whether objective measures would corroborate these changes. The present study compared self-reported and accelerometer-based estimates of changes in moderate-to-vigorous intensity PA (MVPA) from pre- (pre-op) to 6 months postsurgery (post-op). Twenty bariatric surgery (65% laparoscopic-adjustable gastric banding, 35% gastric bypass) patients (46.2 ± 9.8 years, 88% female, pre-op BMI = 50.8 ± 9.7 kg/m(2)) wore RT3 accelerometers as an objective measure of MVPA and completed the Paffenbarger Physical Activity Questionnaire (PPAQ) as a subjective measure before and 6 months after bariatric surgery. Time (min/week) spent in MVPA was calculated for the PPAQ and RT3 (≥ 1-min and ≥ 10-min bouts) at pre-op and post-op. Self-reported MVPA increased fivefold from pre-op to post-op (44.6 ± 80.8 to 212.3 ± 212.4 min/week; P < 0.005). By contrast, the RT3 showed nonsignificant decreases in MVPA for both ≥ 1-min (186.0 ± 169.0 to 151.2 ± 118.3 min/week) and ≥ 10-min (41.3 ± 109.3 to 39.8 ± 71.3 min/week) bouts. At pre-op, the percentage of participants who accumulated ≥ 150-min/week of MVPA in bouts ≥ 10-min according to the PPAQ and RT3 was identical (10%). However, at post-op, 55% of participants reported compliance with the recommendation compared to 5% based on RT3 measurement (P = 0.002). Objectively-measured changes in MVPA from pre-op to 6 months post-op appear to be much smaller than self-reported changes. Further research involving larger samples is needed to confirm these findings and to determine whether self-report and objective PA measures are differentially associated with surgical weight loss outcomes.
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, 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: Jessica L
authors.initials: JL
authors.lastname: Unick
authors.forename: Sivamainthan
authors.initials: S
authors.lastname: Vithiananthan
authors.forename: Dieter
authors.initials: D
authors.lastname: Pohl
authors.forename: G Dean
authors.initials: GD
authors.lastname: Roye
authors.forename: Beth A
authors.initials: BA
authors.lastname: Ryder
authors.forename: Harry C
authors.initials: HC
authors.lastname: Sax
authors.forename: Rena R
authors.initials: RR
authors.lastname: Wing
mesh_terms: D000328:Adult; D050110:Bariatric Surgery / Q000379:methods*; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018670:Monitoring, Ambulatory / Q000295:instrumentation; D009767:Obesity, Morbid / Q000601:surgery / Q000628:therapy*; D010349:Patient Compliance; D059035:Perioperative Period; D057566:Self Report; D011795:Surveys and Questionnaires