1. Dent, E., Martin, F.C., Bergman, H., Woo, J., Romero-Ortuno, R., Walston, J.D.: Management of frailty: opportunities, challenges, and future directions. The Lancet 394(10206), 1376–1386 (2019)
2. Parvaneh, S., et al.: Regulation of cardiac autonomic nervous system control across frailty statuses: a systematic review. Gerontology 62(1), 3–15 (2016)
3. Sokas, D., et al.: Wearable-based assessment of heart rate response to physical stressors in patients after open-heart surgery with frailty. IEEE J. Biomed. Health Inf. In Press (2023)
4. Margarito, J., Helaoui, R., Bianchi, A.M., Sartor, F., Bonomi, A.G.: User-independent recognition of sports activities from a single wrist-worn accelerometer: a template-matching-based approach. IEEE Trans. Biomed. Eng. 63(4), 788–796 (2015)
5. Sokas, D., et al.: Wearable-based signals during physical exercises from patients with frailty after open-heart surgery (2022)