 This will be a cross sectional study comparing patients with HFpEF and age-matched, non-HF controls recruited from the community. This design will allow for determination of biologically relevant differences in baseline ventricular and vascular function, and importantly, differences in the ability to augment ventricular and vascular function dynamically during exercise stress, when symptoms of HF typically are first noted. The endpoint of exercise-reserve function is novel and has been little examined in the existing HFpEF literature. 