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

Hospital de Clinicas de Porto Alegre

Status: Completed

Conditions: Obesity; Metabolic Syndrome

Treatments: Behavioral: hypocaloric diet; Behavioral: Exercise recommendations; Behavioral: Pragmatic diet; Behavioral: Pedometer-based fitness (10,000 steps); Behavioral: Structured assisted exercise (fitness)

Study type: Interventional

Funder types: Other

Identifiers

NCT00943865

GPPG07033 HCPA FIPE

07033

Details and patient eligibility

About

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.

Full 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).

Enrollment: 76 patients

Sex: All

Ages: 30 to 55 years old

Volunteers: Accepts Healthy Volunteers

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

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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76 participants in 3 patient groups

hypocaloric diet + exercise advice

Active Comparator group

Description:

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.

Treatment:

Behavioral: Exercise recommendations

Behavioral: hypocaloric diet

pragmatic diet+ pedometer 10000 steps

Experimental group

Description:

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.

Treatment:

Behavioral: Pedometer-based fitness (10,000 steps)

Behavioral: Pragmatic diet

pragmatic diet + fitness

Experimental group

Description:

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.

Treatment:

Behavioral: Pragmatic diet

Behavioral: Structured assisted exercise (fitness)