Korean Life-Style Modification Effects on Blood Pressure

Summary

In hypertension, lifestyle modification has been proven to be effective in reducing blood pressure while decreasing the risk of cardiovascular disease. The dietary approaches to stop hypertension(DASH) diet, sodium restriction and exercise has been shown to reduce systolic blood pressure by 8-14mmHg, 2-8mmHg and 4-9mmHg, respectively. The DASH-sodium diet has been shown to have additional systolic blood pressure lowering effect of 7.2mmHg, which is equal to adding one antihypertensive drug. However, as the dietary pattern is different in the Korean population, the investigators cannot implement the data from Western countries directly to the Korean population. For example, the consumption of dairy products is much smaller in the Korean population when compared to the western population. Therefore, the effectiveness of DASH-sodium diet and exercise on blood pressure lowering in the Korean population is not well defined. In this study, the investigators sought to determine the effectiveness of the DASH-salt diet and DASH-salt diet plus exercise on brachial blood pressure lowering. The study will be performed on untreated prehypertension patients and uncontrolled hypertensive patients undergoing anti hypertensive treatment with blood pressure measured between 140-159mmHg/90-99mmHg at the time of enrollment.

Conditions

• Prehypertension
• Hypertension

Interventions

DRUG

Control group who are advised for proper life style modification by the physician such as regular exercise and healthy diet without active intervention.

All the study subjects will undergo baseline brachial blood pressure measurement(OMRON HEM 7080IT), central aortic blood pressure measurement with Sphygmocor device(AtCor Medical), baseline laboratory, 24hr urine Na measurement, 24 hour ambulatory blood pressure and cardiopulmonary exercise test. These tests will be repeated at the 8th week.

DIETARY_SUPPLEMENT

Treatment group 1(Dietary intervention)

The dietary intervention is based on active education of the enrolled subjects based on Korean modified DASH diet. The enrolled subjects are advised to substitute processed white rice with whole grains such as barley. For protein, the subjects are advised to consume chicken and fish instead of red meat. Also, consumption of nuts are recommended where as processed foods containing high fructose corn syrup are not recommended. We will recommend to reduce salt intake by advising the subjects from adding table salts to their meals as well as adding salt during cooking. We will advise the subjects from eating pickles and condiments, which are the main source of salt in the Korean population. The degree of salt reduction before and after intervention will be assessed by 24 hour recall as well as measurement of 24 hour urine Na collection at baseline and at the 8th week. The compliance of the subjects will be assessed by 24hr recall as well.

OTHER

Treatment group 2(dietary and exercise intervention)

The dietary intervention will be combined with exercise intervention. At baseline, the subjects will undergo evaluation for (1) cardiopulmonary function by undergoing cardiopulmonary exercise test and 3 minute step test 2) muscle strength assessment by hand grip test and 3) push ups to assess muscle endurance. After the initial evaluation, the subjects will be subjected to a course in aerobic exercise and muscle strengthening exercise developed by the Yonsei University Physical education department and will receive an educational DVD program. The subjects will each be given an electronic step counter to assess the degree of exercise. All the subjects in the treatment group 2 will be advised to undergo moderate to stenuous aerobic exercise for least 150 minutes /per week. Also, the subjects will be educated to perform muscle strengthening exercise as specificed in the educational program. The subjects will be asked to submit an exercise diary to assess the degree of compliance.

Sponsors & Collaborators

• Yonsei University

  lead OTHER

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Model

SINGLE_GROUP

Eligibility

Min Age

20 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2011-09-30

Primary Completion

2015-02-28

Completion

2015-02-28

Countries

• South Korea

Study Locations