Abstract
BackgroundRoux-en-Y Gastric Bypass (RYGB) patients overestimate their time spent in moderate-to-vigorous physical activity (MVPA) to a greater extent post-surgery than pre-surgery. However, there is no data on discrepancy between self-reported and accelerometer-measured MVPA beyond nine months post-RYGB. The aim was to investigate how the duration of MVPA (main outcome) differs when comparing a self-administered questionnaire to accelerometer-data from pre-surgery and up to 48 months post-RYGB.MethodsTwenty-six (38%) RYGB-treated women with complete data from the original cohort (N = 69) were included. Participants were recruited from five Swedish hospitals. Mean pre-surgery BMI was 38.9 (standard deviation (SD) = 3.4) kg/m2 and mean age 39.9 (SD = 6.5) years. MVPA was subjectively measured by a self-administered questionnaire and objectively measured by the ActiGraph GT3X+ accelerometer at 3 months pre-RYGB and 9- and 48 months post-RYGB. Means and SD were calculated at 3 months pre- and 9- and 48 months post-RYGB. We calculated the P-values of the differences with Wilcoxon Signed-Rank test. For correlations between the self-administered questionnaire and the accelerometers, Spearman’s rank correlation was used.ResultsParticipants significantly overestimated (i.e. self-reported more time spent in MVPA compared to accelerometry) their MVPA in a higher degree post- compared to pre-RYGB surgery. Compared to pre-surgery, self-reported MVPA increased with 46.9 and 36.5% from pre- to 9- and 48 months, respectively, whereas changes were a 6.1% increase and 3.5% decrease with accelerometers. Correlations between self-reported and accelerometer-measured MVPA-assessments were poor at all measurement points (r = 0.21–0.42) and only significant at 48 months post-RYGB (P = 0.032).ConclusionsThe discrepancy between self-reported and objectively assessed MVPA within the same individual is greater up to 48 months post-RYGB compared to before surgery. To help bariatric patients understand and hopefully increase their physical activity behaviors post-surgery, objective measures of physical activity should be used.
Highlights
Roux-en-Y Gastric Bypass (RYGB) patients overestimate their time spent in moderate-to-vigorous physical activity (MVPA) to a greater extent post-surgery than pre-surgery
Engaging in sufficient moderate-to-vigorous physical activity (MVPA) is especially associated with additional health outcomes and reduced mortality [2]. This is shown by the World Health Organization (WHO) as well as in new guidelines from the United States, that recommend a minimum of ≥150 min/week of MVPA for improved health outcomes [3, 4]
Bond et al compared 25 bariatric patients’ self-reported physical activity to accelerometer measured physical activity pre- and six months post-bariatric surgery [23], and Berglind et al compared self-reported and accelerometer measured physical activity three months pre- and 9 months post-RYGB in 43 women [19]
Summary
Roux-en-Y Gastric Bypass (RYGB) patients overestimate their time spent in moderate-to-vigorous physical activity (MVPA) to a greater extent post-surgery than pre-surgery. There is some evidence suggesting that reduction of sedentary time (ST) can contribute to positive health outcomes [5, 6] Bariatric surgery, such as Roux-en-Y Gastric Bypass (RYGB), is the most effective method for sustainable weight loss [7, 8]. An interesting finding from the study by Berglind et al [19] was that the same individuals overestimated their physical activity to a greater extent after their surgery compared to before: at 3 months pre-surgery the patients overestimated their MVPA with 7.5 min/day when comparing self-reported to accelerometer measured MVPA, while 9 months post-surgery the overestimation had increased to 26.2 min/day
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