Home-Based Cardiac Rehabilitation Using a Smart Ring and Telephone Counselling: A Randomized Controlled Trial.

Authors

Chul Kim, So Myong Jun, Jeong Yeol Yoo, Ha Young Cho, Dong Woon Jeon, Seung Jin Oh, Se-Jung Yoon, Jong-Kwan Park, Hancheol Lee, Ji-Yong Jang, Hyeongsoo Kim, Jang Woo Lee

Published in

Journal of Korean medical science. Volume 41. Issue 36. Pages e260. Sep 14, 2026. Epub Sep 14, 2026.

Abstract

Home-based cardiac rehabilitation (HB-CR) is a promising alternative to center-based cardiac rehabilitation as it can address several barriers impeding CR implementation because of its enhanced accessibility. However, to date, HB-CR has not garnered adequate attention due to a lack of communication between patients and medical staff. In this study, we aimed to investigate the effectiveness of HB-CR by monitoring the pulse rate (PR) using a smart ring equipped with photoplethysmography.
Patients with cardiovascular disease were educated on structured HB-CR methods following a symptom-limited cardiopulmonary exercise test (CPET), and were instructed to wear the device during the exercise session. The recorded PR was uploaded to a website via a smartphone and monitored by medical staff. Patients were randomly assigned to one of two groups: intervention or control group. The intervention group received weekly telephone counselling and was encouraged to maintain optimal levels of physical activity. In contrast, the control group only recorded their exercise data without additional interventions. After 3 months of training, the CPET was performed.
Among the 64 randomized patients (32 in each group), an intention-to-treat analysis showed that peak oxygen consumption increased over time in both the groups, with a significantly greater improvement in the intervention group. The group-by-time interaction for peak oxygen consumption was statistically significant (estimated mean difference, 2.0 mL/kg/min; 95% confidence interval, 0.7-3.3; P = 0.004).
HB-CR using a smart device was effective in improving oxygen consumption. However, appropriate monitoring and timely counselling by medical professionals are important for improved outcomes.
Clinical Research Information Service Identifier: KCT0005893.

PMID:
42740666
Bibliographic data and abstract were imported from PubMed on 15 Sep 2026.

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