{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,27]],"date-time":"2026-10-27T10:21:47Z","timestamp":1793096507094,"version":"4.5.0"},"reference-count":48,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2021,9,10]],"date-time":"2021-09-10T00:00:00Z","timestamp":1631232000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000781","name":"European Research Council","doi-asserted-by":"publisher","award":["693045"],"award-info":[{"award-number":["693045"]}],"id":[{"id":"10.13039\/501100000781","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002341","name":"Academy of Finland","doi-asserted-by":"publisher","award":["310526"],"award-info":[{"award-number":["310526"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002341","name":"Academy of Finland","doi-asserted-by":"publisher","award":["321336"],"award-info":[{"award-number":["321336"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002341","name":"Academy of Finland","doi-asserted-by":"publisher","award":["328818"],"award-info":[{"award-number":["328818"]}],"id":[{"id":"10.13039\/501100002341","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003130","name":"Fonds Wetenschappelijk Onderzoek","doi-asserted-by":"publisher","award":["12Z5720N"],"award-info":[{"award-number":["12Z5720N"]}],"id":[{"id":"10.13039\/501100003130","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Finnish Ministry of Education and Culture","award":["NA"],"award-info":[{"award-number":["NA"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>(1) Background: The purpose of this study was to evaluate the day-to-day variability and year-to-year reproducibility of an accelerometer-based algorithm for sit-to-stand (STS) transitions in a free-living environment among community-dwelling older adults. (2) Methods: Free-living thigh-worn accelerometry was recorded for three to seven days in 86 (women n = 55) community-dwelling older adults, on two occasions separated by one year, to evaluate the long-term consistency of free-living behavior. (3) Results: Year-to-year intraclass correlation coefficients (ICC) for the number of STS transitions were 0.79 (95% confidence interval, 0.70\u20130.86, p &lt; 0.001), for mean angular velocity\u20140.81 (95% ci, 0.72\u20130.87, p &lt; 0.001), and maximal angular velocity\u20140.73 (95% ci, 0.61\u20130.82, p &lt; 0.001), respectively. Day-to-day ICCs were 0.63\u20130.72 for number of STS transitions (95% ci, 0.49\u20130.81, p &lt; 0.001) and for mean angular velocity\u20140.75\u20130.80 (95% ci, 0.64\u20130.87, p &lt; 0.001). Minimum detectable change (MDC) was 20.1 transitions\/day for volume, 9.7\u00b0\/s for mean intensity, and 31.7\u00b0\/s for maximal intensity. (4) Conclusions: The volume and intensity of STS transitions monitored by a thigh-worn accelerometer and a sit-to-stand transitions algorithm are reproducible from day to day and year to year. The accelerometer can be used to reliably study STS transitions in free-living environments, which could add value to identifying individuals at increased risk for functional disability.<\/jats:p>","DOI":"10.3390\/s21186068","type":"journal-article","created":{"date-parts":[[2021,9,12]],"date-time":"2021-09-12T21:48:01Z","timestamp":1631483281000},"page":"6068","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Day-to-Day Variability and Year-to-Year Reproducibility of Accelerometer-Measured Free-Living Sit-to-Stand Transitions Volume and Intensity among Community-Dwelling Older Adults"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2232-6047","authenticated-orcid":false,"given":"Antti","family":"L\u00f6pp\u00f6nen","sequence":"first","affiliation":[{"name":"Faculty of Sport and Health Sciences, Gerontology Research Center, University of Jyv\u00e4skyl\u00e4, 40014 Jyv\u00e4skyl\u00e4, Finland"},{"name":"Physical Activity, Sports and Health Research Group, Department of Movement Sciences, KU Leuven, 3000 Leuven, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1372-2304","authenticated-orcid":false,"given":"Laura","family":"Karavirta","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences, Gerontology Research Center, University of Jyv\u00e4skyl\u00e4, 40014 Jyv\u00e4skyl\u00e4, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5205-9616","authenticated-orcid":false,"given":"Erja","family":"Portegijs","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences, Gerontology Research Center, University of Jyv\u00e4skyl\u00e4, 40014 Jyv\u00e4skyl\u00e4, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0710-0069","authenticated-orcid":false,"given":"Kaisa","family":"Koivunen","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences, Gerontology Research Center, University of Jyv\u00e4skyl\u00e4, 40014 Jyv\u00e4skyl\u00e4, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taina","family":"Rantanen","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences, Gerontology Research Center, University of Jyv\u00e4skyl\u00e4, 40014 Jyv\u00e4skyl\u00e4, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7697-2813","authenticated-orcid":false,"given":"Taija","family":"Finni","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences, Neuromuscular Research Center, University of Jyv\u00e4skyl\u00e4, 40014 Jyv\u00e4skyl\u00e4, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christophe","family":"Delecluse","sequence":"additional","affiliation":[{"name":"Physical Activity, Sports and Health Research Group, Department of Movement Sciences, KU Leuven, 3000 Leuven, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4547-589X","authenticated-orcid":false,"given":"Evelien Van","family":"Roie","sequence":"additional","affiliation":[{"name":"Physical Activity, Sports and Health Research Group, Department of Movement Sciences, KU Leuven, 3000 Leuven, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6977-4782","authenticated-orcid":false,"given":"Timo","family":"Rantalainen","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences, Gerontology Research Center, University of Jyv\u00e4skyl\u00e4, 40014 Jyv\u00e4skyl\u00e4, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,9,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"638","DOI":"10.1093\/ptj\/70.10.638","article-title":"Whole-Body Movements During Rising to Standing from Sitting","volume":"70","author":"Schenkman","year":"1990","journal-title":"Phys. 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