We Can Prevent Diabetes: A Behavioral Intervention to Reduce Diabetes Risk in African Americans

Phase 1

Completed

• Conditions: Prediabetes
• Interventions: Behavioral: Mindfulness-based diabetes prevention education group; Behavioral: Conventional diabetes prevention education group

• Registration Number: NCT01227473
• Lead Sponsor: University of North Carolina, Chapel Hill

Brief Summary

Pre-diabetes, characterized by glucose levels that are above normal but below the diagnostic criteria for diabetes, is an increasingly common condition, particularly among African Americans. Changes in physical activity, changes in diet, and levels of stress influence the course of the disease. Helping individuals to reduce stress and to increase healthy coping strategies may enhance conventional diabetes prevention efforts, especially among African Americans. Mindfulness training is a cost-effective intervention which may be effective in reducing stress and enhancing the ability to make behavioral changes. This exploratory pilot study will examine the potential efficacy of a diabetes prevention education program that includes training in mindfulness-based stress reduction (intervention group) for pre-diabetic African Americans, comparing it to a conventional diabetes prevention program (control group) in the ability to improve glucose metabolism as well as other relevant physiological and psychological secondary outcomes.

Detailed Description

Pre-diabetes, characterized by glucose levels that are above normal but below the diagnostic criteria for diabetes, is an increasingly common condition affecting approximately 54 million U.S. adults. African Americans are disproportionately affected by pre-diabetes and experience high rates of diabetes-associated morbidity and mortality including damage to the circulatory system, kidneys, and nervous system. Patients with pre-diabetes who increase their physical activity and improve their diets have reduced risk of developing diabetes. Psychological distress negatively influences the course of the disease by increasing deleterious health behaviors; preventing scheduling and maintenance of positive behavior change; and stimulating HPA-axis activation and dysregulation, which may have a direct impact on insulin resistance and glucose metabolism. African Americans may have increased exposure to stress and increased vulnerability to adverse stress-related health outcomes like diabetes, because of their unique history, sociocultural experiences, and societal position in the U.S. Helping individuals to reduce stress and to increase healthy coping strategies may enhance conventional diabetes prevention efforts, especially among African Americans.

Mindfulness-based stress reduction (MBSR), a mind-body practice with a wide range of health benefits, has been shown to result in statistically significant reductions in psychological stress and anxiety in randomized, controlled studies. Mindfulness training is cost-effective in comparison with other small-group or individualized programs, and can be taught safely and effectively by well-trained instructors. There is little research, and no randomized, controlled trials of MBSR as a treatment for individuals with pre-diabetes. There is also little research on the acceptability of MBSR program to a prediabetic subgroup of African Americans, or on the acceptability of an MBSR program for a general population of African Americans.

Overall goals of this exploratory pilot study are to study the potential efficacy of a diabetes prevention education program that includes training in mindfulness-based stress reduction for pre-diabetic African Americans. Specific Aims are 1) to determine the feasibility of developing a clinical trial to compare the effectiveness of a mindfulness-based diabetes prevention program (treatment group) with a conventional diabetes prevention program (control group) in improving glucose metabolism in pre-diabetic African American adults; 2) to identify relevant physiological and psychological secondary outcomes associated with a mindfulness-based, educational self-care program in African-Americans with pre-diabetes; 3) to assess the acceptability and cultural relevance of MBSR for pre-diabetic African Americans via a post-intervention qualitative study, to include interviews of participants, dropouts, and instructors; and 4) to identify, and find solutions for, problems in conducting a well-powered clinical trial to assess the efficacy of a mindfulness-based diabetes prevention program in improving glucose metabolism in pre-diabetic African-Americans.

Study Timeline

• Study Start: 2010-02
• Study First Submitted: 2010-04-15
• Study First Submitted QC: 2010-10-21
• Study First Posted: 2010-10-25
• Primary Completion: 2012-02
• Study Completion: 2012-05
• Status Verified: 2012-06
• Last Update Submitted: 2012-06-13
• Last Update Posted: 2012-06-15

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 74

Inclusion Criteria

• African-American
• 25-65 years of age
• meeting the ADA criteria for pre-diabetes (either by fasting plasma glucose (FPG) of 100-125 mg/dl or glucose of 140-199 mg/dl at 2 hours in an oral glucose tolerance test (OGTT))or a HbA1c of 5.7-6.4%
• experiencing some degree of stress
• willing to attend 1 1/2 hour group meetings once weekly for 8 weeks, followed by monthly booster sessions for six months, and to complete assessment instruments.

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Exclusion Criteria

• diabetes diagnosed by a physician
• past or current use of hypoglycemic medication (except gestational diabetes)
• disease associated with disordered glucose metabolism
• use of medications associated with impaired glucose metabolism
• active treatment for or history of a major medical illness
• previous training in meditation or mindful yoga, tai chi, qigong
• pregnant or planning a pregnancy

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
mindfulness prediabetes education group	Mindfulness-based diabetes prevention education group	The mindfulness-based diabetes prevention education group meets for 2 ½ hours per week for eight weeks, with one 4-hour retreat between the 6th and 7th weeks, and monthly booster sessions for 6 months. During the 8-week interventions, the group receives a 30-minute health behavior presentation (based on the landmark Diabetes Prevention Program). In the mindfulness-based diabetes prevention group, the instruction will be enhanced with instruction in mindfulness.
conventional prediabetes education group	Conventional diabetes prevention education group	The conventional diabetes prevention education group meets for 2 ½ hours per week for eight weeks, with one 4-hour retreat between the 6th and 7th weeks, and monthly booster sessions for 6 months. During the 8-week interventions, the group receives a 30-minute health behavior presentation (based on the landmark Diabetes Prevention Program). In the conventional diabetes prevention group, the instruction will be enhanced with group exercises and discussions.

Primary Outcome Measures

Name	Time	Method
insulin resistance, as measured by the homeostatic model assessment-insulin resistance (HOMA-IR)	Fasting samples will be collected 3 weeks, on average, before the intervention and at 3 months post intervention.	The homeostatic model assessment-insulin resistance (HOMA-IR) is a calculated measure based on the FPG and fasting insulin levels.

Secondary Outcome Measures

Name	Time	Method
Salivary cortisol	Salivary cortisol will be measured before the intervention and at 2 weeks, 3 months, and 6 months post intervention
Insulin resistance as measured by the HOMA-IR	2 weeks and 6 months post-intervention	The HOMA-IR is calculated from the fasting insulin and fasting glucose.

Trial Locations

Locations (1)

University of North Carolina at Chapel Hill; 🇺🇸 Chapel Hill, North Carolina, United States