The Effect of Exercise Training on Mental Stress-Induced Silent Ischemia

Study Overview
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Brief Summary
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Coronary artery disease (CAD) remains the leading cause of death in the elderly. Silent myocardial ischemia (SI) is a manifestation of CAD in which there is a transient alteration in myocardial perfusion, function, and/or electrical activity not accompanied by chest pain. Mental and emotional stress, in particular hostility and anger are potent inducers of SI, Individuals with SI are at a 3-5 fold higher risk for the development of angina, myocardial infarction and death than subjects without SI.

Detailed Description
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The hypothesis of this study is that older individuals with occult cad, mental stress/ emotional arousal (anger) increases sympathetic nervous system activity resulting in vasoconstriction thereby eliciting transient episodes of SI. Therefore an aerobic exercise intervention that reduces the response to anger/hostility and improves vascular compliance will decrease the ischemic burden in SI patients. The specific objectives are: To determine if non-smoking older individuals with exercise-induced SI have increased vasoreactivity (blood pressure, heart rate) responses to the laboratory presentation of mental stressors, decreased vascular compliance and brachial artery endothelial reactivity compared to matched non-ischemic controls; 2) To perform a randomized clinical trial that will examine the effects of 9 months of aerobic exercise training versus usual care on vasoreactivity, vascular compliance and ischemic burden on Holter monitor. Older individuals without a history of overt CAD will be recruited and evaluated for the presence of exercise-induced SI. Baseline cross-sectional comparisons of vasoreactivity and cardiovascular function will be performed between those with SI and non-ischemic controls. The individuals with SI will be enrolled in a randomized clinical trial of exercise vs usual care. Exercise treadmill testing with measurement of maximal aerobic capacity will be used to determine fitness. Vasoactivity will be quantified during a mental stress test with real time 2d echo imaging. Vascular function will be assessed using high frequency ultrasound measurements of flow-mediated brachial artery endothelial reactivity.

Official Title
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The Effect of Exercise Training on Mental Stress-Induced Silent Ischemia

Conditions
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Myocardial Ischemia

Intervention / Treatment
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* Behavioral: exercise


Participation Criteria
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Eligibility Criteria
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Older individuals without a history of overt CAD.

Ages Eligible for Study
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Minimum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Allocation: Randomized


Arms and Interventions

| Intervention/Treatment |
| --- |
|Behavioral: exercise|nan|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |