Exercise Training in Type 2 Diabetes and Hypertension

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

PHASE4

Total Enrollment

115 participants

Study Classification

INTERVENTIONAL

Study Start Date

2004-05-31

Study Completion Date

2010-12-31

Brief Summary

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The coexistence of diabetes and hypertension is damaging to cardiac and peripheral vascular structure and function. Although several health organizations endorse exercise training as a treatment for type 2 diabetes, most studies of exercise and diabetes have focused on controlling blood sugar but not on cardiovascular health. The aim of this study is to determine if exercise training reduces blood pressure and improves cardiovascular health in persons who have both type 2 diabetes and hypertension. An equal number of men and women will be enrolled, and another aim of the study is to examine gender differences in response to exercise training.

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Detailed Description

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Type 2 diabetes is associated with damage, dysfunction, and failure of various organs. The coexistence of diabetes and hypertension is particularly damaging to cardiac and peripheral vascular structure and function. These diseases, either alone or combined, result in increased left ventricular mass and wall thickness, left ventricular diastolic dysfunction, impaired endothelial vasodilator function, and increased vascular stiffness. Although several health organizations endorse exercise training as a therapeutic modality for type 2 diabetes, most studies of exercise and diabetes have focused on glycemic control but not on cardiovascular health. Although exercise lowers blood pressure in persons without diabetes, there are profound gaps in knowledge about the effects of exercise training on blood pressure and cardiovascular health in persons with type 2 diabetes. The primary specific aim of this study is to determine if exercise training reduces blood pressure in persons who have both type 2 diabetes and high normal blood pressure or mild hypertension prehypertension or Stage 1 (mild) hypertension. Subjects will be randomized to 6-months of exercise training, consistent with established guidelines for diabetes and for hypertension, or to a usual care control group. The second specific aim is to identify the effects of exercise training on parameters of cardiac and peripheral vascular structure and function related to cardiovascular disease in diabetes and hypertension. We will assess left ventricular mass, left ventricular diastolic function, endothelial vasodilator function, and vascular stiffness using high-resolution ultrasound, Doppler echocardiography, and magnetic resonance imaging. We will also examine interleukin-6 and high-resolution C-reactive protein as novel risk factors for cardiovascular disease and diabetes to determine the effects of exercise training on the inflammatory process. Because exercise training improves fitness and may improve body composition and regional fat distribution, the associations of change in these parameters with change in blood pressure and cardiac and peripheral vascular structure and function will be analyzed. An equal number of men and women will be enrolled, and a third specific aim of the study is to examine gender differences in response to exercise training. This study will expand the scientific knowledge that defines exercise guidelines and will provide new insight into the mechanisms by which exercise reduces blood pressure and improves cardiovascular health in persons with type 2 diabetes and hypertension.

Conditions

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Type 2 Diabetes Hypertension

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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Exercise training

Exercise training, 3 times per week, for 6 months.

Group Type EXPERIMENTAL

Exercise training for 6 months

Intervention Type BEHAVIORAL

Exercise 3 times/week for 6 months. Exercise consists of aerobic and resistance exercise

Control

Usual care no active exercise intervention

Group Type NO_INTERVENTION

No interventions assigned to this group

Interventions

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Exercise training for 6 months

Exercise 3 times/week for 6 months. Exercise consists of aerobic and resistance exercise

Intervention Type BEHAVIORAL

Eligibility Criteria

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Inclusion Criteria

ages 40-65 years type 2 diabetes BP between SBP 120-159 or DBP 80-99 mm Hg sedentary

Exclusion Criteria

cardiovascular disease abnormal exercise stress test smoking insulin use major illnesses that would preclude exercise training pregnancy in women engaged in regular exercise or weight loss diet program substance abuse morbid obesity BMI \> 42

Minimum Eligible Age

40 Years

Maximum Eligible Age

65 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No