Three Lifestyle Interventions on Endothelial Function and Cardiometabolic Risk in Obese Patients With Metabolic Syndrome

Not Applicable

Completed

• Conditions: Metabolic Syndrome; Obesity
• Interventions: Behavioral: Pragmatic diet; Behavioral: hypocaloric diet; Behavioral: Exercise recommendations; Behavioral: Structured assisted exercise (fitness); Behavioral: Pedometer-based fitness (10,000 steps)

• Registration Number: NCT00943865
• Lead Sponsor: Hospital de Clinicas de Porto Alegre

Brief Summary

Obese patients with metabolic syndrome without diabetes or ischemic heart disease were randomized to three lifestyle interventions: 1. hypocaloric tailored diet with standard recommendations 2. pragmatic healthy style diet adapted to brazilian habits with portion control and pedometers to perform 10000 steps daily recorded or 3. pragmatic healthy style diet adapted to brazilian habits with portion control plus fitness three times a week under direct supervision. The main outcome was brachial reactivity, a surrogate marker of atherosclerosis, and secondary outcomes were cardiometabolic profile, arterial pressure and anthropometric measures: weight,waist circumference and bioimpedanciometry to access fat proportion and insulin sensitivity.

Detailed Description

It's a 12 week single center randomized controlled trial to evaluate three different lifestyle interventions on flow mediated vasodilatation, cardiometabolic profile and anthropometric parameters in non-diabetic persons with metabolic syndrome without coronary heart disease.

After informed consent, they will be randomized to 3 different lifestyle interventions: 1. Hypocaloric tailored AHA type 1 diet plus standard exercise advice; 2. Pragmatic portion controlled healthy diet plus pedometers to perform 10.000 steps daily or 3. pragmatic portion controlled healthy diet plus fitness under direct supervision,using heart rate monitors to adjust workload to achieve the target heart rate (75% of the maximum attainable heart rate - HRpeak, as determined by their individual maximal treadmill exercise test).Main outcome is endothelium vasodilation accessed through brachial ultrasound, a surrogate marker of atherosclerosis. Secondary outcomes are anthropometric data: weight, waist circumference and fat proportion, cardiometabolic profile and insulin sensitivity (HOMA-R).

Study Timeline

• Study Start: 2007-06
• Primary Completion: 2008-12
• Study Completion: 2009-06
• Status Verified: 2009-07
• Study First Submitted: 2009-07-20
• Study First Submitted QC: 2009-07-21
• Last Update Submitted: 2009-07-21
• Study First Posted: 2009-07-22
• Last Update Posted: 2009-07-22

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 76

Inclusion Criteria

• men and women 30-55 years with BMI 30-40 and waist 95 cm or more

• normal OGTT

• normal treadmill stress test

• plus 2 of 4:

  1. low serum levels of HDL cholesterol (<40 mg⁄dL for men or < 50 mg ⁄dL for women);
  2. hypertriglyceridemia (triglyceride levels of 150 mg⁄dL or greater);
  3. impaired glucose homeostasis (fasting plasma glucose concentration of 110 mg⁄dL or greater or glucose of 140 mg⁄dL or greater after OGTT or
  4. hypertension (systolic blood pressure ≥ 140 or diastolic blood pressure ≥90 mmHg or treatment with antihypertensive drugs).

Exclusion Criteria

• diabetes
• ischemic heart disease or any abnormality on treadmill stress test
• inflammatory or chronic disorder
• pregnancy
• lactation
• creatinine level of 1,5 mg/dL or more
• gastrointestinal problems or musculoskeletal disorders that would prevent them to follow the test diets or exercise interventions
• liver dysfunction with a factor of at least 3 above the upper limit of normal in AST and ALT levels
• thyroid dysfunction, with serum TSH out of normal limits
• use of immunosuppressive drugs, corticosteroids or anorexigen

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
hypocaloric diet + exercise advice	Exercise recommendations	Group 1 (control: tailored hypocaloric diet and exercise advised): patients received individually tailored hypocaloric diet, with 20% of total calories as fat (with 7-8 % of saturated fats), 50 to 65% carbohydrates and 15% to 20% proteins. Total of calories for each patient calculated assuming the ideal body weight to fulfill a BMI of 25 kg⁄ M2. Total daily amount of calories estimated calculating 30 calories/Kg of ideal weight for each subject. Subjects were advised against consuming high fat snacks or additional fats. Alimentary plans specified the number of servings from each food group, and dairy intake was held constant. Exercise was advised but not measured: they received recommendations to be physically active and perform 1 hour of aerobic exercise as preferred, everyday.
pragmatic diet+ pedometer 10000 steps	Pragmatic diet	Group 2 (pragmatic diet + step counter) - Patients received a portable colored handbook with evidence- based recommendations on healthy eating attitudes and pragmatic menus, with low carbohydrates and high protein and vegetables. It included controlled portions (adjusted for individual hand size) for the six meals, with low glucose aliments and whole grains, legumes, yogurt, fruits, olive oils, eggwhite and low fat milk, fiber and a handful of nuts. Portions were tailored according to individual hand size, without calories counting. Beans, farofa and white cheese bread, which are commonly present in Brazilian food, and red meat were allowed, but with portion control. Subjects were provided with pedometers and were instructed to perform at least 10.000 steps daily, diary recorded.
pragmatic diet + fitness	Structured assisted exercise (fitness)	Group 3 (pragmatic diet + fitness) - They received the same diet intervention (low carbohydrates, high protein and vegetables style diet and favoring daily brazilian cook habits colored handbook) and hand sized portion control instructions of group 2. They were scheduled for a more structured assisted exercise intervention: three bicycle ergometer sessions per week, under direct supervision of the same trained exercise physiologists in each session. Heart rate monitors were used to adjust workload to achieve the target heart rate (75% of the maximum attainable heart rate), as determined by their individual maximal treadmill exercise test. All patients were trained by the same staff, Borg scale was registered in every session and persuasive goal setting was made during exercise sessions.
hypocaloric diet + exercise advice	hypocaloric diet	Group 1 (control: tailored hypocaloric diet and exercise advised): patients received individually tailored hypocaloric diet, with 20% of total calories as fat (with 7-8 % of saturated fats), 50 to 65% carbohydrates and 15% to 20% proteins. Total of calories for each patient calculated assuming the ideal body weight to fulfill a BMI of 25 kg⁄ M2. Total daily amount of calories estimated calculating 30 calories/Kg of ideal weight for each subject. Subjects were advised against consuming high fat snacks or additional fats. Alimentary plans specified the number of servings from each food group, and dairy intake was held constant. Exercise was advised but not measured: they received recommendations to be physically active and perform 1 hour of aerobic exercise as preferred, everyday.
pragmatic diet+ pedometer 10000 steps	Pedometer-based fitness (10,000 steps)	Group 2 (pragmatic diet + step counter) - Patients received a portable colored handbook with evidence- based recommendations on healthy eating attitudes and pragmatic menus, with low carbohydrates and high protein and vegetables. It included controlled portions (adjusted for individual hand size) for the six meals, with low glucose aliments and whole grains, legumes, yogurt, fruits, olive oils, eggwhite and low fat milk, fiber and a handful of nuts. Portions were tailored according to individual hand size, without calories counting. Beans, farofa and white cheese bread, which are commonly present in Brazilian food, and red meat were allowed, but with portion control. Subjects were provided with pedometers and were instructed to perform at least 10.000 steps daily, diary recorded.
pragmatic diet + fitness	Pragmatic diet	Group 3 (pragmatic diet + fitness) - They received the same diet intervention (low carbohydrates, high protein and vegetables style diet and favoring daily brazilian cook habits colored handbook) and hand sized portion control instructions of group 2. They were scheduled for a more structured assisted exercise intervention: three bicycle ergometer sessions per week, under direct supervision of the same trained exercise physiologists in each session. Heart rate monitors were used to adjust workload to achieve the target heart rate (75% of the maximum attainable heart rate), as determined by their individual maximal treadmill exercise test. All patients were trained by the same staff, Borg scale was registered in every session and persuasive goal setting was made during exercise sessions.

Primary Outcome Measures

Name	Time	Method
endothelial mediated vasodilation	at enrollment, after 6 and after 12 weeks

Secondary Outcome Measures

Name	Time	Method
weight	randomization, 6 and 12 weeks

Trial Locations

Locations (1)

Hospital de Clinicas de Porto Alegre; 🇧🇷 Porto Alegre, RS, Brazil