Frailty Status Modifies the Efficacy of Exercise Training among Patients with Chronic Heart Failure and Reduced Ejection Fraction: An Analysis from the HF-ACTION Trial

Ambarish Pandey, Matthew W. Segar, Sumitabh Singh, Gordon R. Reeves, Christopher O'Connor, Ileana Piña, David Whellan, William E. Kraus, Robert J. Mentz, Dalane W. Kitzman