Mazzoni G, et al. - This study evaluated if a 500-m treadmill-walking test carried out at moderate intensity is a valid tool for the estimation of peak oxygen consumption (VO₂peak) in community-dwelling adult and elderly patients with chronic heart failure and reduced left ventricular ejection fraction (HFrEF). No difference was seen between directly measured and estimated VO₂peak values, so, in patients with HFrEF, the value of a moderate and self-regulated 500-m treadmill-walking test for VO₂peak estimation was established. Regarding transitioning from clinically based programs to fitness facilities or self-guided exercise programs in adults and elderly men with HFrEF, these data may have practical implications.