Inclusion criteria:  Adults age> 18 years HFpEF with left ventricular ejection fraction >50% Clinically stable and no hospitalization in last 4 weeks Estimated glomerular filtration rate > 45 mL/min/1.73 m2 as measured by the simplified MDRD formula Stable diuretic regimen  Exclusion criteria:  History of cancer or end stage lung disease Estimated glomerular filtration rate < 45 mL/min/1.73 m2 as measured by the simplified MDRD formula Recent HF decompensation Inability to do exercise test Inability to provide written informed consent History of falls