Better Adherence to Therapeutic Lifestyle Change Efforts Trial (BATTLE)
The purpose of this study is to determine whether knowledge of abnormal results from a noninvasive test for detection of subclinical atherosclerosis (carotid intima media thickness [CIMT]), in addition to knowledge of cardiovascular disease (CVD) risk factors, enhances adherence to healthy lifestyle behaviors in comparison to only CVD risk factor knowledge. We believe that participants with CVD risk factors who have knowledge of their own CIMT test results showing significant subclinical atherosclerosis will demonstrate better adherence to therapeutic lifestyle change (TLC) than those subjects from whom the CIMT test information is withheld.
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Better Adherence to Therapeutic Lifestyle Change Efforts (BATTLE) Trial|
- Change in lifestyle program adherence [ Time Frame: Baseline, Week 12 ] [ Designated as safety issue: No ]A composite index of adherence to the TLC intervention was selected as the primary outcome measure since the main goal of this study is to assess the impact of CIMT imaging knowledge on change in lifestyle behaviors.
- CVD risk factors [ Time Frame: Baseline, 12 weeks ] [ Designated as safety issue: No ]
- C-reactive protein [ Time Frame: Baseline, Week 12 ] [ Designated as safety issue: No ]
- Anxiety [ Time Frame: Baseline, Week 2, Week 12 ] [ Designated as safety issue: No ]
- Atherosclerosis and CIMT Knowledge [ Time Frame: Week 12 ] [ Designated as safety issue: No ]Knowledge test will be given to R-CIMT group only.
- Adherence to each lifestyle change program component [ Time Frame: Baseline, Week 12 ] [ Designated as safety issue: No ]Adherence information will be collected on diet, exercise and attendance at weekly on-site sessions
- Motivation [ Time Frame: Baseline, Week 12 ] [ Designated as safety issue: No ]
- Self efficacy [ Time Frame: Baseline, Week 12 ] [ Designated as safety issue: No ]Nutrition and exercise self-efficacy
|Study Start Date:||November 2007|
|Study Completion Date:||April 2011|
|Primary Completion Date:||July 2010 (Final data collection date for primary outcome measure)|
Experimental: Receive CIMT Results (R-CIMT)
This group will receive visual feedback of their CIMT results on a weekly basis.
Behavioral: CIMT results
Both groups will receive a weekly confidential packet of scripted materials (e.g. educational materials, class schedules, feedback from diet/exercise logs). The R-CIMT group will also receive an CIMT report which contains a copy of one of their own ultrasound scans, with a comparison "normal" scan. This report will also include the CIMT thickness, an interpretation that states their measurements are in the highest quartile for persons of their age and gender, and associated CVD risk. "Interpreting Your CIMT Results" tutorial will be included in the first weekly packet to educate subjects on the detection of atherosclerosis with carotid ultrasound. The CIMT results are withheld from the W-CIMT group until the end of their study participation along with the CIMT tutorial.
No Intervention: Withhold CIMT Results (W-CIMT)
The W-CIMT group will not receive their CIMT results until the end of their study participation.
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The outcomes of subjects randomized to receive their CIMT information (R-CIMT Group) will be compared to a control condition of subjects randomized to have their CIMT information withheld (W-CIMT Group) until the completion of a lifestyle intervention that is common to both groups. The rationale for this intervention is based on the Health Belief Model theory that risk awareness prompts action for behavioral change. In particular, our aim is to study the impact of a subject's own CIMT results, and not the impact of generic educational material related to CIMT and CHD risk, on adherence to a lifestyle change program. Subjects will not know the hypothesis of this study because this knowledge could potentially impact their behavior during the intervention. Also, subjects will not be told that only half of them will receive their CIMT information before the lifestyle intervention, since subjects could potentially infer the study hypothesis from this knowledge. To answer the question of whether CIMT results would be a useful motivational tool for adherence to lifestyle change recommendations, there needs to be a comparison group that does not have their CIMT results. Subjects will be clearly told in the consent process results that they may not receive results of their clinical testing, including the CIMT results, until the end of their participation in this study. Randomization will occur after subjects successfully complete a "run-in" period during screening, which introduces the lifestyle intervention and teaches the proper use of the data collection tools. At the beginning of each week in the randomized phase of the study, subjects will receive a confidential packet of scripted materials. Packets will contain identical information (e.g. educational materials, class schedules, feedback from diet/exercise logs) except that the R-CIMT group will also receive a report that contains a copy of one of their own ultrasound scans, with a comparison picture of a normal scan. This report will also include the CIMT thickness in each artery and an interpretation that states that their measurements are in the highest quartile for persons of their age and gender. Attached to the report will be a tutorial ("Interpreting Your CIMT Results") to more fully educate participants on detection of atherosclerosis with carotid ultrasound. Both the CIMT results report and the tutorial specifically couple the presence of significant subclinical atherosclerosis with increased risk for cardiovascular morbidity and mortality. (Appendix D). If subjects from whom CIMT information is withheld request their CIMT results during the study, they will be told that those results will be made available to them at the end of their participation in the study, which is consistent with the information they were given in the consent process. At the end of the study, subjects who were randomized to receive their CIMT information will be asked to complete a quiz (Atherosclerosis and CIMT Knowledge Assessment) to determine their comprehension of the CIMT information that had been provided to them at randomization (Appendix D).
All randomized subjects will participate in a 12-week lifestyle intervention program that will be introduced and observed in the "run-in" period during screening. This intervention will incorporate strategies that have proven benefit in reduction of CVD risk including aerobic exercise, Mediterranean-type diet, and ongoing contact with weekly, on-site group sessions for lifestyle change education and support integrating Transtheoretical Stages of Change and Social Cognitive learning theories.74-76 To minimize the potential of unblinding research staff to the randomization assignment of a large number of subjects, subjects will enter the next available block of 12-weekly group sessions regardless of randomization assignment. To minimize the potential of unblinding study subjects to the study hypothesis, all subjects will be instructed to refrain from discussing any personal medical or information contained in their weekly packet received during the group support sessions. Randomization assignment will be known only to statistician/data management team.
Aerobic Exercise Physical activity is a pillar of any lifestyle intervention program because it improves cardiorespiratory and muscular fitness and promotes improvement of CHD risk factors including obesity, diabetes, hypertension, and hyperlipidemia. Based on each subject's baseline fitness and safety issues, a physical activity program (with a goal of 180 minutes of aerobic exercise per week by the end of the study) will be prescribed by an exercise physiologist and tailored to individual choices from various types of moderate intensity activities. Exercise is recommended to occur on most days of the week and for at least 10 minutes per session within a defined target heart rate range. After the "run-in" period, exercise will be unsupervised but assessed with a heart rate monitoring device and self-monitoring logs.
Diet A Mediterranean-type diet with caloric goals based on each subject's weight will be prescribed by a registered dietician. The composition of the diet is structured to encourage consumption of plant-based, minimally processed, seasonal foods including fruits, vegetables, whole grains, legumes, nuts, fish and poultry in preference to red meat, low-fat dairy products, and limited amounts of beneficial unsaturated oils such as olive oil. The recommended diet will have a maximum of 35% of total calories from fat, a maximum of 7% of total calories from saturated fat, and a minimum of 15% of total calories from protein. Subjects will be instructed in meal planning and food preparation. Structured menus will be offered as an option. Review of self-monitoring logs by the dietician will guide individual feedback during the "run-in" period and in the weekly communication packets during the randomized period.
Group Support Weekly on-site sessions will be held to stimulate social support for the lifestyle intervention. A structured curriculum focusing on goal setting, problem solving, and stress reduction will be presented by a trained facilitator with opportunity for open discussion. To reinforce the diet plan, a group meal and periodic food preparation demonstrations also will occur during these sessions.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00458874
|United States, Maryland|
|Walter Reed National Military Medical Center / Integrative Cardiac Health Project (ICHP)|
|Bethesda, Maryland, United States, 20889|
|Principal Investigator:||Randolph Modlin, MD||Walter Reed Army Medical Center|
|Study Director:||Marina N Vernalis, DO, FACC||Henry M. Jackson Foundation for the Advancement of Military Medicine|