Heart Failure Clinical Trial
Official title:
Exercise Training in Heart Failure: Structural and Functional Cardiac Remodeling
This is a research study being conducted to better understand the impact of exercise training on changes on the structure and function of the heart. Exercise training in patients with heart failure has been shown to be beneficial at decreasing symptoms of heart failure and improving overall functional capacity or capacity to exercise. However the mechanisms responsible for this are still unclear. This study will look specifically at how exercise creates changes within the hearts filling ability, the hearts pumping strength as well as the hearts ability to rebuild.
Prevalence of systolic heart failure (HF) is high among the growing population of older adults. Progressive cardiac remodeling and deteriorating cardiac output have been implicated as key factors underlying HF-related exercise intolerance and quality of life. Even after implementing medical and device therapies that moderate remodeling, exercise tolerance remains impaired. While exercise training has been demonstrated to improve exercise capacity, mechanisms facilitating this benefit remain unclear. Peripheral adaptations in the skeletal muscle and vasculature provide at least some benefit, however reverse cardiac remodeling (beyond effects of pharmacological and device therapies) may be additive. The investigators propose to study the impact of 2 different types of exercise on cardiac morphology as well as systolic and diastolic performance and related functional gains. The investigators will compare traditional aerobic training to a novel regimen of inspiratory muscle training (IMT). IMT is a specific type of exercise training that may be particularly useful for frail, infirmed HF patients who are unlikely to tolerate aerobic training. Effects of IMT on remodeling have not been previously studied. The proposed echocardiography pilot study builds on a funded VA Merit F0834-R "Exercise Therapy to Reduce Heart Failure Symptoms; Sorting Mechanisms of Benefit" (Exercise therapy) PI, Forman that compares different modes of exercise training in older (age 50yrs) systolic (EF 45%) HF patients. The original study assesses peripheral mechanisms affected by exercise training, but was not designed to assess cardiac remodeling. The proposed pilot study provides a vital complementary analysis, i.e., it adds assessments of cardiac remodeling as well as related changes in systolic and diastolic performance. ;
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