Physical Activity and Sedentary Behavior Change; Impact on Lifestyle

Study Results

Results pending

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Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

308 participants

Study Classification

INTERVENTIONAL

Study Start Date

2015-09-30

Study Completion Date

2019-11-30

Brief Summary

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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.

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Detailed Description

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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.

Aim #1 addresses an important remaining gap in the prevention literature; does objectively measured activity improve as a result of the existing intervention that is being used in DPP-based translation efforts and does this change in activity have an impact on weight change? Aim #2 examines the impact of replacing the conventional physical activity goal of increasing planned and relatively brief bouts of moderate physical activity with one focusing on decreasing sedentary time within the framework of a successful translation lifestyle intervention adapted from the DPP, the Group Lifestyle Balance (GLB) program.

The study design is a prospective, six month delayed-control intervention in which 321 subjects (age 50 and older with a BMI of ≥24 kg/m2 and with prediabetes and/or metabolic syndrome) will be recruited from community centers and randomly assigned to one of three groups: the standard GLB program which includes the conventional moderate activity goal (GLB-MOD), the GLB program with a focus on decreasing sedentary behavior (GLB-SED), or delayed intervention. Subjects assigned to GLB-MOD and GLB-SED will each, separately be compared at 6 months to the delayed-control group after which time, the delayed group will be randomly assigned to either GLB-MOD or GLB-SED. Participants will complete baseline, 6, and 12 month assessment visits. Change in weight, objectively measured activity, and time spent sedentary are the primary outcomes with secondary outcomes including change in self-reported physical activity, HbA1c, fasting glucose, lipids, blood pressure, waist circumference, quality of life and physical function.

It is hypothesized that physical activity assessed by accelerometry in GLB-MOD will significantly increase (mostly moderate intense activity) and that there will be a significant decrease in weight, which will partly be related to change in activity levels. The 2nd hypothesis is that the GLB-SED intervention will significantly decrease time spent sitting as measured by accelerometry and that this change will also be related to a significant decrease in weight. The information that will be gained from this entire effort is important, innovative, and will allow us to obtain a complete and accurate understanding of both ends of the physical activity/inactivity spectrum and their impact in community prevention intervention programs. If shown to be effective, the innovative, modified sedentary-focused translation intervention program would provide a valuable future translation option.

Conditions

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Sedentary Lifestyle Physical Activity

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

PREVENTION

Blinding Strategy

NONE

Study Groups

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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.

Group Type ACTIVE_COMPARATOR

Physical Activity Increase (GLB-MOD)

Intervention Type BEHAVIORAL

The Group Lifestyle Balance (GLB) program was adapted from the original DPP lifestyle intervention. As in the original DPP lifestyle program, the GLB goals are to achieve and maintain a 7% weight loss, and to safely and progressively increase physical activity to 150 minutes/week of moderately intense physical activity similar to a brisk walk.

The curriculum will be administered in intervention groups with an average of 10-15 individuals per group; sessions will be conducted by trained coaches, with participants attending 22 sessions over one year.

The two intervention arms will only differ in the aerobic activity portion of the intervention, which is covered in sessions #4, #10 and 19 as well as participant record keeping and goal setting in regards to activity/inactivity progression.

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.

Group Type ACTIVE_COMPARATOR

Sedentary Time Decrease (GLB-SED)

Intervention Type BEHAVIORAL

As in the original DPP, the GLB goal for weight is to achieve and maintain a 7% weight loss. For this intervention arm, instead of focusing on increasing moderate physical activity, the GLB curriculum will be adapted to address decreasing sitting time. Participants will have a goal of decreasing sitting time by 45 minutes/day. The curriculum will be administered in intervention groups with an average of 10-15 individuals per group; sessions will be conducted by trained coaches, with participants attending 22 sessions over one year.

The two intervention arms will only differ in the aerobic activity portion of the intervention, which is covered in sessions #4, #10 and 19 as well as participant record keeping and goal setting in regards to activity/inactivity progression.

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.

Group Type OTHER

6-month delayed (DELAYED)

Intervention Type OTHER

Individuals assigned to 6 month delay will wait for 6 months from baseline to be randomly assigned to one of the two interventions and will begin intervention at that time. During the waiting period they will receive health information newsletters.

Interventions

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Physical Activity Increase (GLB-MOD)

The Group Lifestyle Balance (GLB) program was adapted from the original DPP lifestyle intervention. As in the original DPP lifestyle program, the GLB goals are to achieve and maintain a 7% weight loss, and to safely and progressively increase physical activity to 150 minutes/week of moderately intense physical activity similar to a brisk walk.

The curriculum will be administered in intervention groups with an average of 10-15 individuals per group; sessions will be conducted by trained coaches, with participants attending 22 sessions over one year.

The two intervention arms will only differ in the aerobic activity portion of the intervention, which is covered in sessions #4, #10 and 19 as well as participant record keeping and goal setting in regards to activity/inactivity progression.

Intervention Type BEHAVIORAL

Sedentary Time Decrease (GLB-SED)

As in the original DPP, the GLB goal for weight is to achieve and maintain a 7% weight loss. For this intervention arm, instead of focusing on increasing moderate physical activity, the GLB curriculum will be adapted to address decreasing sitting time. Participants will have a goal of decreasing sitting time by 45 minutes/day. The curriculum will be administered in intervention groups with an average of 10-15 individuals per group; sessions will be conducted by trained coaches, with participants attending 22 sessions over one year.

The two intervention arms will only differ in the aerobic activity portion of the intervention, which is covered in sessions #4, #10 and 19 as well as participant record keeping and goal setting in regards to activity/inactivity progression.

Intervention Type BEHAVIORAL

6-month delayed (DELAYED)

Individuals assigned to 6 month delay will wait for 6 months from baseline to be randomly assigned to one of the two interventions and will begin intervention at that time. During the waiting period they will receive health information newsletters.

Intervention Type OTHER

Eligibility Criteria

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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:

1. Waist circumference (\>40 inches men, \>35 inches women);
2. Blood pressure \>130 mmHg (systolic) or \>85 mmHg (diastolic) OR history of diagnosed hypertension
3. Low HDL level (\<40mg/dL men, \<50 mg/dL women)
4. Elevated triglyceride level \>150 mg/dL
5. 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.

Minimum Eligible Age

40 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No