2010 AHA 50th Annual EPI/NPAM Joint ConferenceElectronic feedback in a diet and physical activity-based lifestyle intervention for weight loss: randomized controlled trialDepartment of Exercise Science, University of South Carolina, Columbia, SC AbstractBackground: To our knowledge, no studies have evaluated whether weight loss can be promoted in overweight and obese adults through the use of a lifestyle intervention that is based on the SenseWearTM Armband (SWA) device. This study describes the development and evaluation of a technology-based lifestyle intervention designed to help individuals lose weight over 9 months. In this abstract we present data from the 4 month evaluation. Method: We recruited 197 overweight or obese adults (81% women, 32% African-American, mean age, 47 years [SD, 11] and mean BMI, 33 [SD, 5]) from the community. They were randomized to a self-directed weight loss group (control, n=50) or 1 of 3 intervention groups: group-based lifestyle intervention weight loss program (GWL, n=49), GWL plus use of the SWA (GWL-Armband, n=49), or use of the SWA alone (Armband, n= 49). Participants in the group-based programs (GWL and GWL-Armband) received 14-15 one-hour group counseling sessions over the first 4 months, and will receive 6 follow-up phone calls. All participants received a weight loss workbook at baseline. Measurements were made at baseline and 4 months. The primary outcome was body weight. A mixed-model repeated-measures analysis compared change in the intervention groups to the control group on weight status after adjusting for age, sex, race, and education. Analysis of covariance (ANCOVA) models examined weight change between baseline and 4 months after adjusting for baseline weight, and the above covariates. Results: Seventy percent of participants had body weight assessed 4 months after randomization (58% for controls and 72% for intervention groups). The control group's adjusted weight loss was 2.5 pounds which equates to 1.2% weight loss (P=0.15). Intervention groups' adjusted average weight loss (in pounds) was 3.1 for GWL (1.5% weight loss, P=0.06), 7.5 for GWL-Armband (3.7% weight loss, P<0.001), and 6.1 for Armband alone (3.0% weight loss, P<0.001). When examining participants with complete data (n=135), the GWL-Armband group lost 5.0 pounds more than the control group (P=0.02) after adjusting for baseline weight, age, sex, race, and education. Conclusions: SWA may be a useful tool alone or to augment a standard behavioral program to promote lifestyle changes that support weight loss in overweight and obese adults. *This study was supported by an unrestricted research grant from the BodyMedia company. Results of the study were presented at the 2010 American Heart Association 50th Annual Joint Conference of Nutrition, Physical Activity and Metabolism & Cardiovascular Disease Epidemiology and Prevention in San Francisco, CA. Read the press release from the 2010 IHRSA conference. |
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