{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,10]],"date-time":"2026-06-10T16:23:21Z","timestamp":1781108601819,"version":"3.54.1"},"reference-count":32,"publisher":"MDPI AG","issue":"23","license":[{"start":{"date-parts":[[2024,12,7]],"date-time":"2024-12-07T00:00:00Z","timestamp":1733529600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Institute of Aging","award":["NIA\/NIH-1R01AG076774-01A1"],"award-info":[{"award-number":["NIA\/NIH-1R01AG076774-01A1"]}]},{"name":"National Institute of Aging","award":["NSF 2236689\u2014CAREER"],"award-info":[{"award-number":["NSF 2236689\u2014CAREER"]}]},{"name":"National Science Foundation","award":["NIA\/NIH-1R01AG076774-01A1"],"award-info":[{"award-number":["NIA\/NIH-1R01AG076774-01A1"]}]},{"name":"National Science Foundation","award":["NSF 2236689\u2014CAREER"],"award-info":[{"award-number":["NSF 2236689\u2014CAREER"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This study evaluated the reliability of Fitbit in assessing frailty based on motor and heart rate (HR) parameters through a validated upper extremity function (UEF) test, which involves 20 s of rapid elbow flexion. For motor performance, participants completed six trials of full elbow flexion using their right arm, with and without weight. Fitbit and a commercial motion sensor were worn on the right arm. For HR measurements, an ECG system was placed on the left chest alongside the Fitbit on the left wrist. Motor parameters assessing speed, flexibility, weakness, exhaustion, and HR before, during, and after UEF were measured. A total of 42 participants (age = 22 \u00b1 3) were recruited. For motor parameters, excellent agreement was observed between the wearable sensor and Fitbit, except for flexibility (ICC = 0.87 \u00b1 0.09). For HR parameters, ICC values showed weak agreement between ECG and Fitbit for HR increase and recovery (ICC = 0.24 \u00b1 0.11), while moderate to stronger agreement was seen for mean HR during baseline, task, and post-task (ICC = 0.81 \u00b1 0.13). Fitbit is a reliable tool for assessing frailty through motor parameters and provides reasonably accurate HR estimates during baseline, task, and recovery periods. However, Fitbit\u2019s ability to track rapid HR changes during activity is limited.<\/jats:p>","DOI":"10.3390\/s24237827","type":"journal-article","created":{"date-parts":[[2024,12,9]],"date-time":"2024-12-09T11:16:48Z","timestamp":1733743008000},"page":"7827","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Sensor-Based Frailty Assessment Using Fitbit"],"prefix":"10.3390","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-6393-672X","authenticated-orcid":false,"given":"Mohammad","family":"Hosseinalizadeh","sequence":"first","affiliation":[{"name":"Department of Biomedical Engineering, School of Graduate Studies, Rutgers University, Newark, NJ 07107, USA"},{"name":"Department of Rehabilitation and Movementformul Sciences, School of Health Professions, Rutgers University, Newark, NJ 07107, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mehran","family":"Asghari","sequence":"additional","affiliation":[{"name":"Department of Rehabilitation and Movementformul Sciences, School of Health Professions, Rutgers University, Newark, NJ 07107, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nima","family":"Toosizadeh","sequence":"additional","affiliation":[{"name":"Department of Rehabilitation and Movementformul Sciences, School of Health Professions, Rutgers University, Newark, NJ 07107, USA"},{"name":"Department of Neurology, Rutgers Health, Rutgers University, New Brunswick, NJ 07103, USA"},{"name":"Brain Health Institute, Rutgers University, New Brunswick, NJ 07103, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,12,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"M146","DOI":"10.1093\/gerona\/56.3.M146","article-title":"Frailty in older adults: Evidence for a phenotype","volume":"56","author":"Lp","year":"2001","journal-title":"J. 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