During the nationwide state of emergency, many hospitals could not provide outpatient cardiac rehabilitation for cardiac disease patients in order to minimize coronavirus disease 2019 (COVID-19) incidence. The purpose of this study was to examine the trajectories of frailty, physical function and physical activity levels due to interruption and resumption of outpatient cardiac rehabilitation by COVID-19 in elderly heart failure patients. Fifteen patients who did not attend outpatient cardiac rehabilitation during the state of emergency but resumed it after the state of emergency were included. Frailty, physical function and physical activity levels were assessed with the Kihon checklist (KCL), various tests including short physical performance battery (SPPB), and life space assessment (LSA), respectively. Objective parameters were measured at three points; before and after the nationwide state of emergency in Japan and 3 months after resuming outpatient cardiac rehabilitation. The post-state of emergency KCL score was significantly higher than the pre-state of emergency score (P = 0.03), whereas there was no significant difference in KCL between post-state of emergency and 3 months after cardiac rehabilitation resumption. SPPB and LSA scores did not change significantly between pre- and post-state of emergency. The changes in LSA from post-state of emergency to 3 months after cardiac rehabilitation resumption tended to correlate with changes in KCL (r = -0.71, P = 0.11). We demonstrated that frailty status deteriorated significantly in elderly heart failure patients whose outpatient cardiac rehabilitation was interrupted due to COVID-19. In addition, the frailty status showed no significant improvement after 3 months of resuming cardiac rehabilitation.
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