Enhanced Multicenter Dietary Portfolio Study
Từ khóa
trừu tượng
Sự miêu tả
There is a major need for a large RCT to demonstrate the effect of lifestyle modification (diet and exercise) on cardiovascular disease (CVD) outcomes. The pilot study will demonstrate the feasibility as a prerequisite for continuing on to the large RCT. Large RCT: This trial will test the effect of a high impact dietary approach combining foods with functional effects, including LDL-cholesterol (LDL-C) and blood pressure (BP) reduction, together with an exercise program which has been associated with reduction in carotid atheroma assessed by MRI. The combined approach will have a more significant effect on CVD risk factors than previous trials and will be compared with a high cereal fibre diet and exercise advice, consistent with good clinical practice, in a randomized parallel trial of 9 years duration. ~6,000 high risk participants will be recruited comprising individuals with 1) type 2 diabetes, 2) post myocardial infarction (MI), and 3) Statin intolerant individuals. The primary outcome will be CVD event (MI, and stroke, fatal and non-fatal) (1). We believe we will achieve a 20% reduction in CVD events with ~10% related to diet reflected in reduction in traditional risk factors (LDL-C, BP) and 10% to exercise and increased cardiovascular fitness at year 9.
Pilot Study: We therefore propose to undertake a 1 year pilot study with 200 participants to demonstrate feasibility: 1) Successful recruitment (200 participants/year) and 2) retention (>90%)
Background: We have demonstrated the specific CVD reducing potential of the proposed components of our dietary intervention in a series of CIHR funded studies. The core dietary components (dietary portfolio of FDA approved cholesterol-lowering foods) in our recent CIHR-funded trial reduced LDL-C by 13-14% (JAMA 2011) with reductions also in diastolic blood pressure over 6 months. The CVD risk score was reduced by ~10% on the treatment. This approach will be combined with increased levels of monounsaturated fat (MUFA) which in a further CIHR-funded portfolio study raised HDL-C and reduced the total:HDL-C ratio (CMAJ 2010) resulting in an ~11% CVD risk score reduction on the high MUFA compared to the low MUFA portfolio. Low glycemic index foods will be selected which in our CIHR-funded trial in type 2 diabetes increased HDL-C and reduced HbA1c, the total:HDL-C ratio (JAMA 2008) and, with the added emphasis on legumes (dried peas, beans, lentils), significantly reduced BP leading to a CVD risk score reduction of ~5% (Arch Intern Med 2012). We consider this dietary package to have major potential in CVD risk reduction with a possible reduction in relative risk of 24% in the absence of negative or positive interactions.
The physical activity/exercise intervention is the end-product of a 25 year cumulative experience of investigators of the Quebec Heart and Lung Institute regarding physical activity/exercise prescriptions to various types of individuals/patients. Our program has also been recently tested in high risk patients with documented coronary artery disease managed by coronary artery bypass graft procedure (with/without type 2 diabetes). Unpublished preliminary results from this latter intervention in high risk patients indicate that our program not only induces substantial improvements in the CVD risk factor profile beyond clinical guidelines-aligned with optimal pharmacotherapy but that such an intervention appears to induce a significant reduction in carotid artery atherosclerosis assessed by magnetic resonance imaging. The latest meta-analysis estimated that only 150 min/week of moderate exercise reduced CHD risk by 14%. Our Laval program with a 420 min/wk of moderate exercise plus additional structured exercise would therefore also reduce CVD risk by at least 14% (or as much as 39% if the relationship between exercise time and CVD risk reduction were linear). The program aims to reduce sedentary behavior. It is safe and affordable in clinical practice. At a cost of about $900 per patient in the first year where the major training takes place, it is considerably less expensive than the DPP, DPS and Look AHEAD trials.
The research questions are therefore:
1. What is the feasibility in terms of recruitment and retention of implementing a high impact diet and physical activity/exercise program for CVD prevention in high risk or statin-intolerant individuals?
2. Based on the observed retention in the pilot study, the required recruitment for the large trial can be refined, if necessary.
ngày
| Xác minh lần cuối: | 03/31/2017 |
| Đệ trình đầu tiên: | 09/22/2013 |
| Đăng ký ước tính đã được gửi: | 09/29/2013 |
| Đăng lần đầu: | 09/30/2013 |
| Cập nhật lần cuối được gửi: | 04/24/2017 |
| Cập nhật lần cuối đã đăng: | 04/25/2017 |
| Ngày hoàn thành chính ước tính: | 10/06/2014 |
| Ngày hoàn thành nghiên cứu ước tính: | 10/06/2014 |
Tình trạng hoặc bệnh tật
Can thiệp / điều trị
Behavioral: Enhanced Portfolio plus structured exercise
Behavioral: High fiber diet plus routine exercise
Giai đoạn
Nhóm cánh tay
| Cánh tay | Can thiệp / điều trị |
|---|---|
| Experimental: Enhanced Portfolio plus structured exercise Diet: The dietary portfolio advice: to limit saturated fat to <7% of total calories and cholesterol to <200 mg/d) plus inclusion of viscous fibres, soy protein, plant sterols and nuts, 5% extra monounsaturated fat, and selection of low glycemic index foods and will emphasize current recommendations for fruit and vegetable intakes (5-10 servings/d). | Behavioral: Enhanced Portfolio plus structured exercise Foods on the dietary portfolio plan will contribute 9g/1000 kcal viscous fibre as β-glucan (oats, barley, oat bran breads and soups) and psyllium (cereal), 1g plant sterol/1000 kcal diet (in sterol margarine), 22.5g soy protein/1000 kcal (soy burgers, dogs, links, other soy meat analogues, soy milks, yogurts and cheese), and additional sources of plant protein from pulses (eg. Lentils, chickpeas, beans, etc) and 22.5g almonds or equivalent of other nuts/1000 kcal and increased MUFA (as olive and canola oils, avocados, nuts, margarine and salad dressings). The glycemic index will be reduced from 83 to 70 GI units (bread scale).
Exercise: The physical activity/exercise program is based on the program used at the Quebec Heart and Lung Institute. |
| Active Comparator: High fiber diet plus routine exercise A diet of whole grain foods (brown rice, whole wheat breads, muffins and breakfast cereals); reduced meat consumption; lower fat dairy foods and a control margarine | Behavioral: High fiber diet plus routine exercise Dietary advice will be given to encourage intake of whole grain foods (brown rice, whole wheat breads, muffins and breakfast cereals); to reduce meat consumption, choose low fat dairy products and a control margarine.
Exercise: A pamphlet (Canada's Physical Activity Guide, Health Canada) encouraging increased physical activity will be provided. |
Đủ tiêu chuẩn
| Tuổi đủ điều kiện để học | 50 Years Đến 50 Years |
| Giới tính đủ điều kiện để nghiên cứu | All |
| Chấp nhận tình nguyện viên lành mạnh | Đúng |
| Tiêu chí | A) Inclusion Criteria: Eligible participants will be: 1. men, over 50 2. postmenopausal women, over 60 or 3. postmenopausal women under 60 with a family history of hypercholesterolemia and 1 CVD risk factor. Participants will have the following characteristics: - BMI 25-40 kg/m2 with body weight that has remained constant (within ±3%) over the last 3 months preceding the onset of the study - Plus at least 1 of the following 3 criteria: 1. have type 2 diabetes with one of the following: - raised LDL-C(in accordance with the 2012 Canadian Cardiovascular Society Guidelines) - raised BP (> 130/80mmHg), or - active smoking; 2. be non-diabetic subjects post MI or post percutaneous coronary intervention (angioplasty) on statin therapy; and 3. have a modified Framingham risk score >20% (CCS 2012) and are unable (intolerant) or unwilling to take statin drugs. B) Exclusion Criteria: Individuals with the following conditions will be excluded: - cardiovascular disease that precludes exercise e.g. - recent stroke or - myocardial infarction, or - cardiac condition that compromises normal function - mitral valve disease, - heart failure--grades 2-4 (New York Heart Association classification), - severe angina or - other conditions preventing exercise, - secondary causes of hypercholesterolemia - hypothyroidism, (unless treated and on a stable dose of L-thyroxine) - renal or liver disease - uncontrolled blood pressure - major disability - disorder requiring continuous medical attention and treatment: - chronic heart failure, - liver disease, - renal failure or - cancer (except non-melanoma skin cancer--basal cell, squamous cell), - chronic infections (bacterial or viral) - chronic inflammatory diseases (e.g. lupus, ulcerative colitis) - other autoimmune diseases - major surgery <6 months prior to randomization - alcohol consumption >2 drinks/d. |
Kết quả
Các biện pháp kết quả chính
1. Feasibility measured by recruitment and retention rates [1 year in a 9 year study]
Các biện pháp kết quả thứ cấp
1. Serum lipids: total cholesterol, LDL-chol, HDL-chol and Triglycerides [At months -3, -2, -1 and then at months 0, 3, 6 and 12]
2. C-reactive protein [At months -3, -2, -1 and then at months 0, 3, 6 and 12]
3. Hemoglobin A1c [At months -3, -2, -1 and then at months 0, 3, 6 and 12]
4. Glucose [At months -3, -2, -1 and then at months 0, 3, 6 and 12]
5. Blood Pressure [At months -3, -2, -1 and then at months 0, 3, 6 and 12]
6. treadmill testing [At months 0 and 12]
7. diet history [At months -3, -2, -1 and then at months 0, 3, 6 and12]
8. Pedometer records [At months 0, 2, 4, 6, 8, 10 and 12]
9. Exercise history [At months 0, 3, 6, and 12]
