Absence of Fitness Improvement Is Associated with Outcomes in Heart Failure Patients.

Purpose: To examine the clinical impact of cardiorespiratory fitness (CRF) and improvements in CRF after cardiac rehabilitation (CR) in heart failure (HF) patients for their risk of all-cause mortality and unplanned hospitalization. Secondly, to investigate possible factors associated with the absence of improvement in CRF after rehabilitation. Methods: We included 155 HF patients receiving CR between October 2009 and January 2015. Patients performed an incremental bicycle test to assess CRF through peak oxygen uptake (VO2-peak) before and after CR-based supervised exercise training. Patients were classified as responders or non-responders based on pre-to-post CR changes in VO2-peak (>=6% and

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