Frailty in geriatric patients is defined as a syndrome of reduced physiological reserve and vulnerability to stressors broadly classified as acute or chronic illnesses [1]. Frail individuals have markedly elevated risk of adverse health events [2], and frailty is a high-priority issue in cardiovascular medicine [3,4]. Heart failure (HF) is a leading cause of hospitalization [5], and is associated with poor prognosis and quality of life, as well as increased medical costs [6]. Frailty has significant effects on overall health as well as the clinical prognosis of elderly patients with HF [7]. Moreover, frailty at hospital discharge was reported to be associated with increased mortality rate [8]. Therefore, earlier prediction of frailty at discharge is necessary in elderly patients with HF at the time of hospitalization to allow appropriate clinical management, therapeutic decision-making, and for risk stratification. In addition, to predict frailty at discharge, an assessment tool is required that can be used conveniently, rapidly, safely, and immediately after admission. Some previous studies reported that rising from bed, including required time, is associated with decreased activities of daily living (ADLs) [9]. Therefore, we hypothesized that the rising time from bed measured immediately after admission could predict frailty at discharge and/or reduced physical performance with prognostic significance.