The main purpose of this study is to evaluate the effectiveness of VAMOS program, a physical activity and healthy eating promotion program, in hypertensive from Recife-Pernambuco- Brazil. Approximately 90 subjects with a diagnosis of hypertension, under anti-hypertensive medication and classified as non-physically active, will be selected and randomly distributed into two groups: a change behavior group (CBG) and control group (CG). The CBG will participate of a change behavior program, entitled VAMOS - Active Life Improving Health, for 12 weeks and composed of a weekly meeting, in group, lasting about 90 minutes. In each weekly meeting, will be presented and discussed guidelines and strategies for practical physical activities in different fields and for adoption of a healthy diet in order that the level of physical activity and eating quality improve. The program will be evaluated by effectiveness, implementation and maintenance (initial and individual level) dimensions of RE-AIM framework. The effectiveness will be assessed from anthropometric measurements, body composition, eating habits, physical activity level, stages of self-change, self-efficacy, social support, quality of life and assessment of cardiovascular function at rest (clinic and home blood pressure, arterial stiffness, blood flow and flow-mediated dilation, heart rate and heart rate variability) before and after 12 weeks of intervention. The implementation will be assessed by identifying the extent to which the program will be conducted as planned. The maintenance, initial and at individual level, will be estimated from revaluations of all outcomes, as measured before and after the intervention, three months after the end of the program. For data analysis, in addition to descriptive statistics, two-way ANOVA for mixed models wil be applied for for within and between groups comparison, if the premises of this test are met. The level of significance that will be adopted is P\<0.05. All analyzes will be done at SPSS statistical package, version 17.0.
The overall goal of this study is to evaluate the effectiveness of VAMOS program, a physical activity and healthy eating promotion program, in hypertensive from Recife-PE- Brazil. As secondaries goals, the study attempts to: 1. evaluate the effectiveness of VAMOS program with regard to physical activity, the sedentary behavior and eating habits in hypertensives; 2. analyze whether self-efficacy, stages of self-change and social support mediate the possible effects of VAMOS program on physical activity, sedentary behavior and eating habits in hypertensives; 3. evaluate the effectiveness of VAMOS program with regard to clinic and home blood pressure, arterial stiffness, blood flow and flow-mediated dilation, heart rate and heart rate variability in hypertensives; 4. evaluate the effectiveness of VAMOS program on anthropometric and body composition variables in hypertensives; 5. analyze whether the possible result changes brought from VAMOS program in behavioral and biological variables promote changes in quality of life of hypertensives; 6. assess the implementation of VAMOS program in nonpharmacological treatment of hypertension in Recife, northeastern of Brazil; 7. identify whether the possible effects achieved from VAMOS remain three months after the end of the program in hypertensives.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
90
All participants that will be assigned to change behavior group will participate of a change behavior program, entitled VAMOS (Active Life Improving Health), for 12 weeks. VAMOS is a lifestyle promotion program, that includes physical activity and healthy eating habits. The program is composed by a weekly meeting, in group, lasting about 90 min. In each weekly meeting, will be discussed guidelines and strategies for physical activities practices in different domains and for adoption of a healthy diet. All aspects and strategies included in the program are based in behavior changes theories. The participants of this group will receive an educational material and, in the middle of the program, they will earn a pedometer to aid in motivation and in the self-monitoring physical activity.
Aline Mendes Gerage
Florianópolis, Santa Catarina, Brazil
change in clinic blood pressure
Systolic blood pressure (SBP) and diastolic blood pressure (DBP) will be checked using an automatic oscillometric instrument (Omron HEM 742-E0 - USA). The patients will be instructed to eat a light meal before the measurements, to avoid physical exercise and alcohol ingestion for at least 24 hours prior to the visit, and to avoid smoking and caffeine for at least 12 hours. Measurements will be taken in two non-consecutive days, after 10 minutes of rest in the supine position and three measurements will be done in each day, with one minute interval between measurements. All measurements will be taken on the left arm, in a quiet environment, with monitored temperature.
Time frame: baseline, 12 weeks, 24 weeks
change in physical activity
Habitual physical activity will be assessed by GT3X or GT3X+ accelerometer (Actigraph - USA) and Actilife 6.10 software will be used to analysis. Each participant will be instructed to use the accelerometer for seven consecutive days, removing it only for sleeping, bathing or performing water activities. The device will be attached to an elastic belt and fixed in the right side of the hip. Data will be collected in a 30 Hz sample frequency and will be analyzed using 60-s epochs. Periods with consecutive values of zero (with 2-min of spike tolerance) for 60 min or longer will be interpreted as "accelerometer not worn" and excluded from the analysis. Physical activity data only will be included if the participant accumulate a minimum of 10 hours/day of recording for at least four days, including one weekend day.
Time frame: baseline, 12 weeks, 24 weeks
change in eating habits
Eating habits will be investigated from the number of meals daily, quality chewing food, dietary intake concomitantly liquids at mealtimes, habit of eating salads, raw or cooked vegetables, daily water consumption habits and intake of visible fat from meat and chicken. Also, the food frequency questionnaire will be applied, using a list of foods for which the average frequency of consumption over the last three months is given.
Time frame: baseline, 12 weeks, 24 weeks
change in anthropometric parameters
Body mass will be measured with participants wearing light clothes and no shoes, using an automatic scale (Welmy - Brazil) to the nearest 0.1 kg. Height will be measured using a stadiometer connected to scale to the nearest 0.5 cm. Body mass index will be calculated as the ratio between body mass in kilograms and the square of height in meters.
Time frame: baseline, 12 weeks, 24 weeks
change in body composition
Total body fat and body fat trunk will be estimated by densitometry scans for dual-energy X-ray absorptiometry (DXA) (Lunar Prodigy DXA, model NRL 41990, GE Lunar, Madison, WI). For the assessment, participants will be instructed to remain clothed but to remove any metallic prosthesis or objects. The procedure will last five to ten minutes for each individual and will be carried out by the same technician who will calibrate the device according to the manufacturer's recommendations.
Time frame: baseline, 12 weeks, 24 weeks
change in arterial stiffness
Pulse wave analyses, to obtain augmentation index, central systolic blood pressure, diastolic blood pressure and carotid-femoral pulse wave velocity will be measured using Sphygmocor (Atcor Medical, Sydney, Australia). The measurement of these parameters will be done according to guidelines specified by the Clinical Application of Arterial stiffness, Task Force III.
Time frame: baseline, 12 weeks, 24 weeks
change in heart rate variability
For heart rate variability assessment, R-R interval will be obtained using a heart rate monitor (POLAR, RS 800CX; Polar Electro Oy Inc, Kempele, Finland). Participants should remain in the supine position for 10 minutes, after approximately 10 minutes at rest. All analyses will be performed with Kubios software (Biosignal Analysis and Medical Imaging Group - Finland) by a single evaluator, following the recommendations of the Task Force of the European Society of Cardiology and the North American.
Time frame: baseline, 12 weeks, 24 weeks
change in blood flow and flow-mediated dilation
For assessment of blood flow and flow-mediated dilation, the method of venous occlusion pletysmography will be used (Hokanson - EC6 - EUA) with measurement being done in the left arm. A cuff will be placed around the left arm and another cuff will be placed around the wrist. A strain gauge pletysmography will be positioned in the largest forearm circumference. For blood flow measurement, the wrist cuff will be inflated and then the arm cuff for 10 seconds, followed by 10 seconds of deflation, totaling 20 seconds in each cycle. Inflation of the cuff will be made during the cardiac diastole, which will be perceived by an electrocardiogram. The measurement will be performed 12 times in a row, completing four minutes. The flow-mediated vasodilation will be assessed by vascular response to vasodilator stimuli using the technique of reactive hyperemia.
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Time frame: baseline, 12 weeks, 24 weeks
change in home blood pressure monitoring
Each participant will receive an automatic device (OMRON - HEM - 742INT) and will be instructed to perform over four days, four measures of blood pressure at home, two in the morning and two at night. They will be instructed to taking five minutes of rest and one minute of interval between measurements. In addition, subjects will be instructed to perform the steps before taking the medicaments and before breakfast or dinner, following the recommendations of III Guidelines for Home Blood Pressure Monitoring.
Time frame: baseline, 12 weeks, 24 weeks
change in stages of self-changes
The stages of self-changes for physical activity and for healthy eating habits will be assessed by questionnaires that classified subjects in one of five stages: pre-contemplation, contemplation, preparation, action and maintenance.
Time frame: baseline, 12 weeks, 24 weeks
change in self-efficacy
The self-efficacy will be evaluated by scale "Self-Efficacy to Regulate Eating Habits e Self-Efficacy to Regulate Exercise" proposed by Bandura (2006) and validated for Brazilian adults by Boff (2012).
Time frame: baseline, 12 weeks, 24 weeks
change in social support
The social support for physical activities will be evaluated by a scale proposed by Reis et al. (2011).
Time frame: baseline, 12 weeks, 24 weeks
change in quality of life
The quality of life will be assessed by two general questions from Whoqol BREF.
Time frame: baseline, 12 weeks, 24 weeks