Abstract P118: Changes in Physical Activity by Self-Weighing Trajectory Groups
Introduction: Numerous studies have established a significant association between regular self-weighing and weight loss; however, few studies have examined how self-weighing patterns are associated with lifestyle changes, e.g. physical activity (PA). The aim was to examine the association between frequency of self-weighing and changes in PA levels.
Hypothesis: We hypothesized that higher frequencies of self-weighing are associated with greater increases in PA levels.
Methods: This was an analysis of data from a 12-mo behavioral weight loss intervention study. Each subject was given a Wi-Fi scale and instructed to weigh daily. The scale transmitted weight values to a central server. PA was objectively assessed by an accelerometer (ActiGraph GT3x) at 0 and 6 mos. Participants were instructed to wear the accelerometer for ≥ 3 weekdays, one weekend day, ≥10 hours/day. General linear model was used for data analysis.
Results: The sample (N=89) was largely female (89.9%), White (82%), with a mean age (±SD) of 51.9±9.3 years, and a mean BMI of 33.6±4.5 kg/m2. Our previous analysis using group-based trajectory modeling identified 3 self-weighing patterns: high/consistent (self-weighed 5-6 days/week regularly); moderate/declined (declined from 4-5 to 2 days/week); minimal/declined (declined from 5-6 to 0 days/week). As shown in the table, compared with minimal/declined self-weighing group, the high/consistent group had a significant increase in energy expenditure, steps, light and moderate PA levels as well as average activity/day, while the moderate/declined group had a significant increase in steps and average activity/day.
Conclusions: The differences in PA level changes across the trajectory groups suggest that improved adherence to self-weighing carried over to improved PA behavior changes. It is unclear if self-monitoring weight and observing the results led participants to regulate their PA behavior accordingly. Future research needs to examine the mechanisms of how daily weighing impacts the level of daily PA.
Author Disclosures: Y. Zheng: None. S.M. Sereika: None. L.J. Ewing: None. C.A. Danford: None. B. Rockette-Wagner: None. C.C. Imes: None. H. Lu: None. R. Sun: None. L.E. Burke: None.
- © 2015 by American Heart Association, Inc.