A self regulatory weight reduction intervention in diabetes type II patients.
|- candidate number||1601|
|- NTR Number||NTR381|
|- Date ISRCTN created||19-dec-2005|
|- date ISRCTN requested||28-okt-2005|
|- Date Registered NTR||12-sep-2005|
|- Secondary IDs||0451 |
|- Public Title||A self regulatory weight reduction intervention in diabetes type II patients.
|- Scientific Title||A self regulatory weight reduction intervention in diabetes type II patients.
|- ACRONYM||Leiden Study|
|- hypothesis||Self regulatory weight reduction interventions offer a good environment for overweight diabetic type II patients to loose weight and lower their HbA1c.
(more specific see below) |
Based on the literature (see introduction) following hypotheses are formulated:
1. Patients who engage in their disease management actively (condition b, c) generate better results concerning losing weight and lowering HbA1c than patients who are not actively engaged in their disease management.
2. Patients who have set their own health goal(s) (condition b) achieve health goal(s) more easily and quicker than patients who have not set their own health goal(s).
3. Patients who have made a specific ‘action plan’ of how to achieve their health goal(s) (condition b) achieve the health goal(s) more easily and quicker than patients who have no action plan.
4. Patients who have recognized and discussed the barriers to health goal achievement (condition b) overcome these barriers more easily and quicker than patients who have not recognized and discussed the barriers to health goal achievement.
5. Patients who are able to recognize and solve conflict between their health goal(s) (condition b) and other important goals achieve their health goal(s) more easily and quicker than patients who are not able to recognize and solve goal conflict.
6. Patients who are able to recognize and solve conflict between their health goal(s) (condition b) and important goals of their partner or important other achieve their health goal(s) more easily and quicker than patients who are not able to recognize and solve conflict between their and their partners’ (health) goals.
7. Patients who are able to regulate their health goal(s) related emotions (condition b) achieve their health goal(s) more easily and quicker than patients who are not able to regulate their health goal(s) related emotions.
8. Patients who are taught maintenance skills (condition b) maintain their healthy behaviour more easily and longer than patients who are not taught maintenance skills.
9. Patients who feel supported by the group meetings (condition b) achieve their health goal(s) more easily and quicker than patients who do not feel supported by the group meetings.
10. Patients who receive tailored information with regard to disease management (condition b) manage their disease better than patients who do not receive tailored information about disease management.
|- Healt Condition(s) or Problem(s) studied||Diabetes Mellitus Type 2 (DM type II)|
|- Inclusion criteria||Diabetes type II according to WHO classification (1999): fasting blood glucose levels > 126 mg/dl (7mmol/l) or levels > 200 mg/dl (11.1 mmol/l) two hours after an oral glucose tolerance test, treated by an internist from the Máxima Medical Centre, BMI 27-45, between 21 and 70 years old, Caucasian patients who are able to understand, read and write in Dutch. |
|- Exclusion criteria||Patients with any severe co morbidity (except for cardiovascular diseases) will be excluded. Patients who are currently under treatment for a psychological or psychiatric disorder will also be excluded from the study. |
|- mec approval received||yes|
|- multicenter trial||no|
|- Type||2 or more arms, randomized|
|- planned startdate ||1-jun-2005|
|- planned closingdate||1-okt-2006|
|- Target number of participants||270|
|- Interventions||The three treatment conditions in this study are:|
a)Standard care condition by an internist, including:
- individualized diet instructions by a dietician, individualized self-injection and blood glucose level monitoring instructions by a diabetic-nurse, and advice on exercise training by internists.
b)Condition a + goal setting + psychological treatment by means of a tailored self-help manual and group meetings. In a motivational interview at baseline (1 hour) patients are motivated for weight management, through an active lifestyle and modified eating patterns, and are motivated to set a personal relevant health and social goal which relates to weight loss. Trained health psychologists will help patients set these goals by means of a goal setting procedure similar to those developed by Williams and colleagues (1996; 1998). Most relevant health goals related to weight reduction are eating healthily and exercise.
One week after the motivational interview, patients will be sent a brief summary of their stated goals. Patients are given the opportunity to specify or modify the goals that were formulated in the interview.
Patients will be asked to bring the summary of their goals to the first group meeting two weeks after the motivational interview.
The group meetings (10 patients per group) involve self regulatory strategies directed at achieving the personal relevant health and social goal related to weight loss.
In group meetings and home assignments self regulatory processes are discussed and applied to personal relevant barriers in the achievement of the weight loss goals.
The summary of the patients’ formulated goals in the motivational interview will serve as a basis for the group meetings. During the group meetings (and the home assignments) this summary will be worked out to a goal scheme in which processes and steps are formulated that facilitate achievement of patients’ health and social goal.
In the first part of the group meetings there is time to discuss patients’ experiences and feelings with regard to goal progress and barriers to goal progress. This part will also facilitate patients’ skills to ensure social support from the environment (partner, buddy system, family members and friends).
All group sessions are offered by a psychologist. Group sessions will be offered during the daytime as well as during the evenings. Psychologists will provide an additional telephone structure after the first two months of the intervention (1 x 10 minute phone call every month).
A diabetes manual, based on principles for self regulatory interventions (Maes & Karoly, 2004) will help the diabetes patients regulate their behaviour at home and continue the programme in the absence of a group meeting.
The manual consists of an information part with information regarding exercise, healthy eating, stress induced eating, medication and self-testing and an assignment part in which patients are challenged and motivated to apply self regulatory principles of behaviour change to themselves.
The information part will contain general diabetes and weight relevant information partly derived from the Diabetes Manual (UK; see condition c). The assignment part will contain self-regulation based exercises which are tailored to the patients’ self-chosen health and personal goals.
Exercises will help patients move toward goal achievement and motivate them for behaviour change on a weekly basis (see appendix VII for content of self regulatory diabetes manual). The manuals will be piloted on readability, lay-out, and understanding.
c)(active control group) Condition a + Diabetes Manual Programme. The Diabetes Manual consists of a 230-page booklet to be used in a twelve week behavioural programme. The manual which is based on the validated Heart Manual (Lewin, 1992) has been developed and piloted in the UK. The English version of the Diabetes Manual has been translated into Dutch and will be piloted on readability, lay-out, understanding and cultural influences (see appendix VII for content of diabetes manual).
The twelve week programme in the booklet is divided into 6 stages which include topics such as exercise initiation and maintenance, healthy eating and coping with stress.
Aim to the twelve week programme is to enhance the patients’ self-efficacy for engaging in diabetes-related behaviours through mastery experiences, information provision, record keeping, responding to biomedical feedback, goal setting and achievement.
An audiotape provides a question and answer session between a general practitioner and a patient and a side for partners of patients.
A second tape, to promote relaxation, is included. A diabetes nurse additionally provides a telephone support structure.
|- Primary outcome||1. The main (biomedical) outcome measure in this intervention is GlyHb;
2. The main behavioural outcome measure in this intervention is weight in kilograms. This will be measured at baseline and throughout the intervention in both the intervention and the standard care groups;
3. Dietary and exercise behaviour will be assessed throughout the intervention by means of a short diary procedure. Patients will be asked to shortly write down their nutrition and exercise behaviour from the past week;
4. Psychological outcome measures refer to various psychological factors that may facilitate or inhibit progress toward the weight reduction goals (see also secondary outcome).
|- Secondary outcome||1. Diabetes Quality of Life Measure (DQOL) Patients’ quality of life is measured by the subscale ‘impact’ (20 items) of the validated 46-item Diabetes Quality of Life Measure (DQOL, DCGT Research Group, 1987). |
2. The DQOL ‘impact’ scale measures the impact of diabetes treatment and disease management on daily life on a 5-point Likert scale (never-all the time).
3. Problem Areas in Diabetes (PAID).
4. Psychological distress is measured by the validated 20-item Problems Areas in Diabetes (PAID, Polonsky et. al., 1995).
5. The PAID is a brief instrument to assess diabetes-specific distress on a 5-point Likert scale (no problem at all – a very serious problem).
6. Diabetes Management Self-Efficacy Scale (DMSES).
7. Diabetes related self-efficacy will be measured by the validated Diabetes Management Self-Efficacy Scale (DMSES, Sturt & Hearnshaw, 2003). The DMSES contains of 20 items on a 10-point Likert scale (absolutely not able – I’m totally able).
8. Positive and Negative Affectivity Scale (PANAS).
9. Patients’ negative and positive affect will be measured by the validated 20-item Positive and Negative Affectivity Scale (PANAS, Watson, Clark & Tellegen, 1988). The PANAS consists of 20 mood related words for which patients can indicate on a 5-point scale (not at all applicable – very applicable) to what extent the word is applicable to their mood over the past two weeks.
10. Beck Depression Inventory II (BDI-II) Depressive thoughts and feelings will be measured by the validated 20 item Beck Depression Inventory II (BDI-II, Beck, 1987). De BDI-II consists of 21 multiple choice questions of how patients felt within the past two weeks. Nineteen questions have 4 multiple choice options, two questions have 7 multiple choice options.
11. Self-Regulation Skills Scale and GAPI Patients’ self-regulation skills and goal processes will be measured by the 15- and 45-item Self-Regulation Skills Scale (Maes & de Gucht, 2004) and five subscales (26 items) of the validated 71-item Goal and Processes Inventory (Maes, Pomaki, Joekes, Boersma, Gebhardt & Huisman, 2001) respectively. Both the self-regulation skills scale and the GAPI consist of statements for which the patients indicate on a 5-point Likert scale to what extent they agree with the statement (totally disagree – totally agree).
12. Biomedical outcome measures are measured in the standard care procedure for all diabetes patients in the Maxima Medical Centre in Eindhoven. These measures include: GlyHb, systolic blood pressure, total cholesterol, triglyceride, LDL cholesterol and HDL cholesterol.
|- Trial web site||N/A|
|- status||inclusion stopped: follow-up|
|- CONTACT FOR PUBLIC QUERIES||Drs. Sasja Huisman|
|- CONTACT for SCIENTIFIC QUERIES||Drs. Sasja Huisman|
|- Sponsor/Initiator ||Máxima Medical Center|
(Source(s) of Monetary or Material Support)
|- Brief summary||In this randomized controlled trial with 270 diabetes type II patients (BMI >27), the effectiveness of several weight reduction interventions will be compared. Research questions concern the effectiveness of different ways of approaching patients in a weight reduction intervention (group meetings versus a Diabetes Manual versus standard care). |
The primary research question of this intervention is: what are the effects of the various weight reduction interventions on GlyHb, weight and BMI?
Outcome measures will be measured after 6 and 12 months after starting the intervention groups.
|- Main changes (audit trail)|
|- RECORD||12-sep-2005 - 2-sep-2009|
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