Study limitations
CVDs, ill
ADVERSE EVENTS
As the study was conducted during the COVID-19 pandemic, the number of participants was very limited. Patients eligible for hospital-based CR and those who lived alone or had severe CVDs were excluded. This study was designed as a quasi-randomised controlled trial for safety reasons. As no adverse events were observed in this study, a randomised controlled trial is needed. Furthermore, this was a single-centre study; a multicentre collaborative study should be considered in the future. In addition, the quasi-randomisation-controlled trial setting limits the potential generalisation of the findings.Furthermore, the present study was conducted on a small sample size. Based on the results of this study, future studies should include larger sample sizes. In the future, comprehensive research is needed to clarify the efficacy of remote CR in severely ill patients and patients living alone. Future studies are also warranted for further risk stratification according to illness severity.