Physical Activity and Sedentary Behavior Change; Impact on Lifestyle Intervention Effects for Diabetes Translation
Trial Snapshot
- Phase
- Not Applicable
- Status
- Completed
- Sponsor
- University of Pittsburgh
- Enrollment
- 308
- Locations
- 1
- Primary Endpoint
- BMI (Body Mass Index)
Study Overview
Brief Summary
Diabetes Prevention Program translational efforts, such as the Group Lifestyle Balance Program (GLB), have been shown to be effective in reducing weight and modifying diabetes and CVD risk factors in a variety of diverse community settings. Although one of the two primary goals of these DPP translation programs focuses on increasing physical activity levels, few published DPP translation studies reported results on change in physical activity with only one study reporting activity levels from an objective measurement instrument. In order to completely understand the role that physical activity plays in making healthy lifestyle change, it is critical that we validate the impact of activity using a valid and reliable objective measure. In addition, current studies suggest that decreasing time spent sitting may have a positive health impact separate from the effects of participating in planned bouts of moderate intensity activity. Therefore, we propose to examine the impact of a modified version of the GLB program, which will focus on decreasing sedentary/sitting behaviors. The results of this project will provide information regarding best options for physical activity within lifestyle intervention programs, focusing both on verifying the current role of physical activity in lifestyle intervention using an objective measure and on examining an alternative intervention option for translation efforts.
Detailed Description
Translation efforts based upon the successful Diabetes Prevention Program (DPP) have shown that this behavioral lifestyle intervention model is effective in a variety of diverse community settings. Despite the fact that physical activity is a key part of the DPP lifestyle intervention as one of the two intervention goals, activity change in the DPP, and/or the resulting translation studies modeled after it, has not been adequately verified with an accurate objective measure. In addition, previous research has shown that, in many subgroups of the general population, moderate and vigorous physical activity is non-existent. Individuals with activity only at the low end of the intensity spectrum may have a difficult time increasing their levels of moderate+ intensity physical activity for various reasons such as limited function or lack of motivation. For these individuals, interventions with a movement goal of increasing planned bouts of moderate intensity activity may not be as effective and therefore not as beneficial as interventions with a movement goal of decreasing time spent sitting.
The purpose of this proposal is to understand the impact of movement, specifically physical activity and sitting time, in a DPP-adapted community lifestyle intervention, Group Lifestyle Balance (GLB).
Aim 1: To determine if the GLB lifestyle intervention, shown to be effective in translation efforts in decreasing weight and increasing self-reported activity, has significant changes in physical activity levels determined by a validated objective measure, the accelerometer. It is hypothesized that participants randomized to the conventional lifestyle intervention arm (GLB-MOD) will have significant improvements in our primary endpoints of weight and physical activity (measured objectively) compared to a delayed-intervention control at 6 months and will have reductions in several secondary outcome measures (fasting glucose, insulin, blood pressure, waist, lipids, physical function, and quality of life).
Aim 2: To determine if a lifestyle intervention program similar to the one described above, with the only change being that the activity focus is now replaced with an inactivity focus (GLB-SED), is also effective. It is hypothesized that participants randomized to GLB-SED will have a significant improvement in the primary endpoints of weight and decreased inactivity (measured objectively) compared to a delayed-intervention control at 6 months and will have significant reductions in several of the secondary endpoints (fasting glucose, insulin, blood pressure, waist circumference, lipids, physical function, quality of life).
Secondary Aims: To examine the pre-post change in participants for weight, physical activity (objective and subjective), and sedentary time from baseline to 6 and 12 months of intervention for each randomized arm and to understand the inter-relationships of these behavioral factors over time. It is hypothesized that those GLB-MOD participants who achieve significant weight loss will also have significant increases in their moderate+ intensity activity levels. Similarly, we hypothesize those GLB-SED participants who achieve significant weight loss will also have significant decreases in the amount of time they spent sedentary/sitting. An estimate of the difference in participant cost between the two versions of the lifestyle intervention programs will also be determined.
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Parallel
- Primary Purpose
- Prevention
- Masking
- None
Eligibility Criteria
- Ages
- 40 Years to — (Adult, Older Adult)
- Sex
- All
- Accepts Healthy Volunteers
- No
Inclusion Criteria
- •Individuals attending screening who are found to have prediabetes AND/OR the metabolic syndrome are eligible to participate in the intervention. Pre-diabetes is defined as having a fasting glucose >100 mg/dL and <126mg/dL and/or a hemoglobin A1C of 5.7%-6.4%.
- •Metabolic syndrome is defined as having at least 3 of the 5 following risk factors:
- •Waist circumference (>40 inches men, >35 inches women);
- •Blood pressure >130 mmHg (systolic) or >85 mmHg (diastolic) OR history of diagnosed hypertension
- •Low HDL level (<40mg/dL men, <50 mg/dL women)
- •Elevated triglyceride level >150 mg/dL
- •Fasting glucose >100mg/dL and <126mg/dL
- •Individuals attending screening with hyperlipidemia plus one additional component of the metabolic syndrome are also eligible.
Exclusion Criteria
- •Individuals who are identified as having diabetes as a result of the screening are not eligible. All individuals enrolled in the study should have at least 6th grade English reading/writing ability. Physician approval will be requested to clear for the activity portion of the program.
Arms & Interventions
Physical Activity Increase (GLB-MOD)
Participants randomized to this arm will follow the traditional GLB program with an activity goal of 150 minutes per week of moderately intense physical activity similar to a brisk walk. Progression of the activity goal each week is slow and safe with increases of no more than 30 minutes per week. Participants are requested to try and achieve 20-30 minutes per day of moderate activity but, to allow for flexibility, that amount can be split into 10 minute increments. Self-reported monitoring for this group includes keeping track of weight, daily food intake as well the number of minutes each day spent being active as part of their planned activity goal. This is all recorded in the self-monitoring keeping track book.
Intervention: Physical Activity Increase (GLB-MOD) (Behavioral)
Sedentary Time Decrease (GLB-SED)
The GLB curriculum will be adapted to direct participants to decrease the time they spend sitting in a day rather than to increase moderate+ physical activity as is the case in the current GLB program. In order for the participant to become aware of how much time they spend sitting and where most of their sitting time occurs, they will fill out a "7 Day Sedentary Diary" that consists of daily entry of time spent sitting over the course of one week. Participants will be asked to eliminate a 45 minute sitting bout in a day with non-sitting activity. They will initially be asked to eliminate 45 minutes of sitting for two days in that week. This will increase one day a week until 7 days in a week are met.
Intervention: Sedentary Time Decrease (GLB-SED) (Behavioral)
6-month delayed (DELAYED)
Those assigned to the DELAYED group at baseline will wait for 6 months to begin intervention. During the delayed time period, these participants will receive periodic health information newsletters. At the end of 6 months, the DELAYED participants will be randomly assigned to GLB-MOD or GLB-SED intervention, and will begin their intervention program at that time.
Intervention: 6-month delayed (DELAYED) (Other)
Outcomes
Primary Outcomes
BMI (Body Mass Index)
Time Frame: Change in BMI between Baseline and 12 months
BMI will be calculated as average weight divided by average height squared (kg/m2).
Actigraph Accelerometry
Time Frame: Change in Physical Activity Level between Baseline and 12 months
Physical activity level objectively measured using Actigraph Accelerometry. This will be worn on the waist and will passively record physical activity and sedentary behavior.
BMI (Body Mass Index)
Time Frame: Change in BMI between Baseline and 6 months
BMI will be calculated as average weight divided by average height squared (kg/m2).
Actigraph Accelerometry
Time Frame: Change in Physical Activity Level between Baseline and 6 months
Physical activity level objectively measured using Actigraph Accelerometry. This will be worn on the waist and will passively record physical activity and sedentary behavior.
Secondary Outcomes
- Gait Speed(Change in Gait Speed between Baseline and 12 months)
- EQ-5D Quality of Life Survey(Change in Quality of Life between Baseline and 12 months)
- Fasting lipid profile test(Change in Fasting lipid profile between Baseline and 12 months)
- Hemoglobin A1c test(Change in Hemoglobin A1c between Baseline and 12 months)
- Blood pressure(Change in Blood Pressure between Baseline and 12 months)
- Modifiable Activity Questionnaire(Change in self-reported Modifiable Activity Questionnaire between Baseline and 12 months)
- Fasting glucose test(Change in Fasting glucose between Baseline and 12 months)
- Fasting Insulin test(Change in Fasting Insulin between Baseline and 12 months)
- Gait Speed(Change in Gait Speed between Baseline and 6 months)
- Fasting glucose test(Change in Fasting glucose between Baseline and 6 months)
- Fasting lipid profile test(Change in Fasting lipid profile between Baseline and 6 months)
- Fasting Insulin test(Change in Fasting Insulin between Baseline and 6 months)
- Hemoglobin A1c test(Change in Hemoglobin A1c between Baseline an 6 months)
- Blood pressure(Change in Blood Pressure between Baseline and 6 months)
- Modifiable Activity Questionnaire(Change in self-reported Modifiable Activity Questionnaire between Baseline and 6 months)
- EQ-5D Quality of Life Survey(Change in Quality of Life between Baseline and 6 months)
Investigators
Andrea Kriska
PhD
University of Pittsburgh