{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T07:46:30Z","timestamp":1776843990599,"version":"3.51.2"},"reference-count":33,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2021,5,11]],"date-time":"2021-05-11T00:00:00Z","timestamp":1620691200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100007921","name":"University of Pittsburgh","doi-asserted-by":"publisher","award":["NIH P30 AG024827"],"award-info":[{"award-number":["NIH P30 AG024827"]}],"id":[{"id":"10.13039\/100007921","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["HHSN271201100605P"],"award-info":[{"award-number":["HHSN271201100605P"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["AG024826"],"award-info":[{"award-number":["AG024826"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["AG036594"],"award-info":[{"award-number":["AG036594"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["AG000181"],"award-info":[{"award-number":["AG000181"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Biomedical Research Networking Center on Frailty and Healthy Aging","award":["CB16\/10\/00477"],"award-info":[{"award-number":["CB16\/10\/00477"]}]},{"name":"Spanish Ministry of Science and Innovation","award":["FJC2018-037925-I"],"award-info":[{"award-number":["FJC2018-037925-I"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Accelerometers\u2019 accuracy for sedentary time (ST) and moderate-to-vigorous physical activity (MVPA) classification depends on accelerometer placement, data processing, activities, and sample characteristics. As intensities differ by age, this study sought to determine intensity cut-points at various wear locations people more than 70 years old. Data from 59 older adults were used for calibration and from 21 independent participants for cross-validation purposes. Participants wore accelerometers on their hip and wrists while performing activities and having their energy expenditure measured with portable calorimetry. ST and MVPA were defined as \u22641.5 metabolic equivalents (METs) and \u22653 METs (1 MET = 2.8 mL\/kg\/min), respectively. Receiver operator characteristic (ROC) analyses showed fair-to-good accuracy (area under the curve [AUC] = 0.62\u20130.89). ST cut-points were 7 mg (cross-validation: sensitivity = 0.88, specificity = 0.80) and 1 count\/5 s (cross-validation: sensitivity = 0.91, specificity = 0.96) for the hip; 18 mg (cross-validation: sensitivity = 0.86, specificity = 0.86) and 102 counts\/5 s (cross-validation: sensitivity = 0.91, specificity = 0.92) for the non-dominant wrist; and 22 mg and 175 counts\/5 s (not cross-validated) for the dominant wrist. MVPA cut-points were 14 mg (cross-validation: sensitivity = 0.70, specificity = 0.99) and 54 count\/5 s (cross-validation: sensitivity = 1.00, specificity = 0.96) for the hip; 60 mg (cross-validation: sensitivity = 0.83, specificity = 0.99) and 182 counts\/5 s (cross-validation: sensitivity = 1.00, specificity = 0.89) for the non-dominant wrist; and 64 mg and 268 counts\/5 s (not cross-validated) for the dominant wrist. These cut-points can classify ST and MVPA in older adults from hip- and wrist-worn accelerometers.<\/jats:p>","DOI":"10.3390\/s21103326","type":"journal-article","created":{"date-parts":[[2021,5,11]],"date-time":"2021-05-11T22:53:40Z","timestamp":1620773620000},"page":"3326","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":60,"title":["Calibration and Cross-Validation of Accelerometer Cut-Points to Classify Sedentary Time and Physical Activity from Hip and Non-Dominant and Dominant Wrists in Older Adults"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0366-6935","authenticated-orcid":false,"given":"Jairo H.","family":"Migueles","sequence":"first","affiliation":[{"name":"Department of Health, Medicine and Caring Sciences, Link\u00f6ping University, 581 83 Link\u00f6ping, Sweden"},{"name":"PROFITH \u201cPROmoting FITness and Health Through Physical Activity\u201d Research Group, Department of Physical Education and Sports, Faculty of Sport Sciences, Sport and Health University Research Institute (iMUDS), University of Granada, 18010 Granada, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4513-9108","authenticated-orcid":false,"given":"Cristina","family":"Cadenas-Sanchez","sequence":"additional","affiliation":[{"name":"PROFITH \u201cPROmoting FITness and Health Through Physical Activity\u201d Research Group, Department of Physical Education and Sports, Faculty of Sport Sciences, Sport and Health University Research Institute (iMUDS), University of Granada, 18010 Granada, Spain"},{"name":"Institute for Innovation &amp; Sustainable Development in Food Chain (IS-FOOD), Public University of Navarra, 31006 Pamplona, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8842-374X","authenticated-orcid":false,"given":"Juan M. A.","family":"Alcantara","sequence":"additional","affiliation":[{"name":"PROFITH \u201cPROmoting FITness and Health Through Physical Activity\u201d Research Group, Department of Physical Education and Sports, Faculty of Sport Sciences, Sport and Health University Research Institute (iMUDS), University of Granada, 18010 Granada, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2344-1741","authenticated-orcid":false,"given":"Javier","family":"Leal-Mart\u00edn","sequence":"additional","affiliation":[{"name":"GENUD Toledo Research Group, Universidad de Castilla-La Mancha, Avenida Carlos III s\/n, 45071 Toledo, Spain"},{"name":"CIBER of Frailty and Healthy Aging (CIBERFES), 28029 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1683-1365","authenticated-orcid":false,"given":"Asier","family":"Ma\u00f1as","sequence":"additional","affiliation":[{"name":"GENUD Toledo Research Group, Universidad de Castilla-La Mancha, Avenida Carlos III s\/n, 45071 Toledo, Spain"},{"name":"CIBER of Frailty and Healthy Aging (CIBERFES), 28029 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2854-6684","authenticated-orcid":false,"given":"Ignacio","family":"Ara","sequence":"additional","affiliation":[{"name":"GENUD Toledo Research Group, Universidad de Castilla-La Mancha, Avenida Carlos III s\/n, 45071 Toledo, Spain"},{"name":"CIBER of Frailty and Healthy Aging (CIBERFES), 28029 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2265-0162","authenticated-orcid":false,"given":"Nancy W.","family":"Glynn","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA 15260, USA"}]},{"given":"Eric J.","family":"Shiroma","sequence":"additional","affiliation":[{"name":"Laboratory of Epidemiology and Population Science, Intramural Research Program of the National Institutes of Health, National Institute on Aging, Baltimore, MD 20892, USA"}]}],"member":"1968","published-online":{"date-parts":[[2021,5,11]]},"reference":[{"key":"ref_1","unstructured":"2018 Physical Activity Guidelines Advisory Committee (2018). 2018 Physical Activity Guidelines Advisory Committee Scientific Report."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Bull, F., Saad Al-Ansari, S., Biddle, S., Borodulin, K., Buman, M., Cardon, G., Carty, C., Chaput, J.-P., Chastin, S., and Chou, R. 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