The Effect of a High Fiber Diet and High-Intensity Interval Exercise in Patients With HFpEF

In the face of a rapidly growing population of older, HFpEF patients, there remains a need to identify ideal rehabilitative therapies to enhance improvements in the physical function of these patients. Pharmacological trials in this population have been characterized by a failure to significantly improve exercise tolerance and hard clinical outcomes and this is likely due to their singular cardiovascular focus. Exercise appears to be a promising intervention to improve cardiorespiratory fitness and reduce cardiovascular risk. Further, evidence-based dietary guidelines for patients with heart failure are lacking. Although a high-protein, low-carbohydrate diet is associated with improvements in traditional CV risk markers in patients with heart failure, it may raise cardiovascular risk in this population by adversely affecting endothelial function, increasing susceptibility to myocardial ischemia, and by inducing a pro-inflammatory state due to increased bacterial and LPS translocation through the ischemic gut. Thus, the investigators will explore the effects of the high-carbohydrate, high-fiber DASH diet due to its potential to have salutary effects on vascular risk in this population. In this study, the investigators will examine the singular and combined effects of exercise and a DASH diet in patients with HFpEF on markers of cardiovascular risk.