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Although weight loss programs are effective in the short-term, maintaining weight loss is more challenging. Regularly tracking and logging physical activity (PA) and diet is related to greater improvements in PA and diet and to greater weight loss over time. Receiving continuous real-time feedback regarding calories burned and calories consumed could enhance weight loss maintenance. This study will examine whether a device that provides such feedback, called the SenseWear armband, enhances weight maintenance.
200 overweight adults aged 18 to 65 years will be randomly assigned to one of four groups: (1) a standard behavior change weight loss group-based program (14 group sessions over a 4 month period followed by 6 phone calls over a 5 month period), (2) a standard behavior change weight loss group-based program (15 group session over a 4 month period followed by 6 phone calls over a 5 month period) combined with the armband, (3) the armband alone (training in the use of the armband and a follow up telephone call), or (4) a self-directed weight loss control group.
Participants will be recruited through USC through listserve emails, flyers, and worksite advertisements. Interested individuals will take part in a telephone screen, an orientation, a run-in visit (which includes 2 weeks of PA and dietary logging), a baseline assessment, and a randomization visit. The intervention will then take place over a 9-month period with eligible participants. Participants will take part in follow-up assessments at month 4 and 9. Assessments at all three times will include questionnaires assessing diet, PA, psychosocial factors related to diet and PA, and quality of life related measures. They will also have their fasting blood drawn to assess lipids, glucose, and insulin, and staff will measure their blood pressure, waist circumference (size), skinfold, height, and weight.
Use of Electronic Feedback on Diet and Physical Activity to Enhance Weight Management Research Summary Steven N. Blair, PED, Principal Investigator
Dr. Blair and the investigative team will evaluate the contribution of the BodyMedia metabolic monitoring system to weight loss within the context of a standard behavioral weight loss program, and also as a stand alone system. The BodyMedia system consists of a metabolic monitor (armband) and computer software that analyzes energy expenditure, duration and level of physical activity, and other metabolic processes in free-living conditions. The proposed study will test the following hypotheses:
1. The standard behavioral weight loss program (Standard), BodyMedia augmented program (Armband), and the Armband Alone will produce more weight loss and reduction in waist circumference over 4 months and maintain greater weight loss and reduction in waist circumference than does a usual care self-help program (Usual Care).
2. The Armband program will produce weight loss and reduction in waist circumference comparable to the Standard program over 4 months.
3. The Armband Alone program will produce weight loss and reduction in waist circumference comparable to the Standard program after 9 months.
4. The Armband program will produce weight loss and reduction in waist circumference greater than the Standard program after 9 months.
1. Body weight
2. Waist circumference
1. Weekly energy expenditure in physical activity.
2. Weekly caloric intake.
3. Percent of participants losing ≥5% of baseline body weight.
4. Stages of Motivational Readiness for physical activity and diet changes.
1. Blood pressure.
2. Fasting lipid profile.
3. Fasting blood glucose.
4. Fasting blood insulin
5. Quality of life.
The design will be a randomized controlled trial with four arms:
1. Standard behavioral weight loss intervention program.
2. Armband (standard behavioral weight loss intervention program augmented by using the BodyMedia armband and monitoring system to reinforce and support making changes in these behaviors).
3. Armband Alone that includes a one-hour orientation at baseline on how to use the armband, with a one week follow-up telephone call to answer questions.
4. Usual care (self-help with a diet and physical activity manual that provides guidance on changing these behaviors).
Fifty participants will be assigned to each of the study arms. The Standard and Armband groups will participate in weekly group counseling sessions for four months. During months 5-7 study staff will contact participants weekly via email or telephone to monitor their reports of dietary and physical activity logging, and to provide counseling support as necessary. During months 8 and 9, these contacts will be monthly. For the Armband Alone group, study staff will make monthly contact by telephone or email to answer questions and provide encouragement.
Data collection for outcomes will occur at baseline, 4 months (no blood chemistry analyses will be performed at 4 months), and 9 months. Participants will be recruited into the study over several months, and all participants will have completed the follow-up (month 9) data collection by the end of the 18-month study period.
Allocation: Randomized, Intervention Model: Parallel Assignment, Masking: Open Label
Body Weight Changes
Group weight loss program, Group weight loss program plus use of the Senseware Armband, Use of the senseware armband alone program, Self-directed weight loss program
University of South Carolina Department of Exercise Science
University of South Carolina
Published on BioPortfolio: 2014-08-27T03:20:08-0400
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