Abstract P110: Mean Daily Pedometer Step Count is Associated With Weight Loss
Introduction: Increased physical activity (PA), along with reduced energy intake, are the key strategies to achieve weight loss. However, there are challenges to obtaining accurate PA data. Many studies rely on self-report, which is easily accessible and inexpensive but is known to have numerous limitations. Pedometers are a relatively inexpensive and accessible method to objectively measure certain aspects of PA. However, their limitations include the inability to assess certain types of PA such as swimming and cycling. The purpose of this analysis was to examine the associations between self-reported PA, pedometer step count data and weight loss in a behavioral weight loss intervention.
Hypotheses: 1) Self-reported PA will not be associated with weight loss. 2) Higher daily pedometer step count will be associated with greater weight loss.
Methods: This was a secondary analysis of 6-month data from the Self Efficacy Lifestyle Focus (SELF) Trial. Self-reported PA was assessed using the Modifiable Activity Questionnaire (MAQ), which provided mean metabolic equivalent (MET) hours/week from occupational and leisure activity during the previous 6 months. MAQ data were collected at baseline and 6 months and percent change in MET hours was calculated. In the third week of the intervention, participants were given a pedometer (Omron HJ-720IT with 42-day memory) and asked to monitor their daily steps. Pedometer data were uploaded at the intervention sessions. Mean daily step counts for the first 6 months were calculated from 21 weeks of pedometer data. Linear regression and ANOVA were used to examine the associations between the measures of PA and percent weight change at 6 months.
Results: The sample (N=130) was 83% female, 71.5% White with a mean (±SD) age of 53±9.5 years and a baseline body mass index of 33.5±3.9 kg/m2. From baseline to 6 months, the mean percent weight change was -6.7±5.3% (range -20.6 to 10.1%). The mean percent change in MET hours/week was +85.6±238.6%. Pedometers were worn on 77±34% of the days to be monitored and recorded a mean daily step count of 5155±2890. Percent change in MET hours/week was not associated with weight change (b=-.089, p=.346), whereas, mean daily step count was associated with weight change (b=-.463, p<.001). Additionally, higher mean daily step count was associated with greater mean weight loss, with -5.1±4.5% weight loss for 7500 steps/day (p=.001).
Conclusions: Pedometer step count was associated with weight loss while the self-reported PA measure was not. Given their relatively low cost and reliability, pedometers should be considered as a standard part of weight management. Additionally, the use of a pedometer with its daily feedback in displaying the steps accrued may help motivate participants to be more active.
Author Disclosures: C.C. Imes: None. L. Ye: None. Y. Zheng: None. J. Mancino: None. C.A. Danford: None. M. Mattos: None. E. Music: None. D.D. Mendez: None. H. Lu: None. L.J. Ewing: None. S.M. Sereika: None. L.E. Burke: None.
- © 2015 by American Heart Association, Inc.