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Yet, activities such as sitting are not accurately distinguished from non-sedentary activities (e.g., upright activities), especially in real-world conditions. This study examines the accuracy of a novel algorithm to identify sitting, lying, and upright activities in community-dwelling older people in real-world conditions. Eighteen older adults wore a single triaxial accelerometer with an onboard triaxial gyroscope on their lower back and performed a range of scripted and non-scripted activities in their homes\/retirement villages whilst being videoed. A novel algorithm was developed to identify sitting, lying, and upright activities. The algorithm\u2019s sensitivity, specificity, positive predictive value, and negative predictive value for identifying scripted sitting activities ranged from 76.9% to 94.8%. For scripted lying activities: 70.4% to 95.7%. For scripted upright activities: 75.9% to 93.1%. For non-scripted sitting activities: 92.3% to 99.5%. No non-scripted lying activities were captured. For non-scripted upright activities: 94.3% to 99.5%. The algorithm could, at worst, overestimate or underestimate sedentary behaviour bouts by \u00b140 s, which is within a 5% error for sedentary behaviour bouts. These results indicate good to excellent agreement for the novel algorithm, providing a valid measure of sedentary behaviour in community-dwelling older adults.<\/jats:p>","DOI":"10.3390\/s23104605","type":"journal-article","created":{"date-parts":[[2023,5,10]],"date-time":"2023-05-10T01:57:51Z","timestamp":1683683871000},"page":"4605","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Validation of an Algorithm for Measurement of Sedentary Behaviour in Community-Dwelling Older Adults"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9620-2875","authenticated-orcid":false,"given":"Khalid","family":"Abdul Jabbar","sequence":"first","affiliation":[{"name":"School of Population Health, Faculty of Medical and Health Sciences, University of Auckland, Auckland 1023, New Zealand"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8589-2420","authenticated-orcid":false,"given":"Javad","family":"Sarvestan","sequence":"additional","affiliation":[{"name":"Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4HH, UK"}]},{"given":"Rana","family":"Zia Ur Rehman","sequence":"additional","affiliation":[{"name":"Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4HH, UK"},{"name":"Janssen Research & Development, High Wycombe HP12 4EG, UK"}]},{"given":"Sue","family":"Lord","sequence":"additional","affiliation":[{"name":"School of Clinical Sciences, Auckland University of Technology, Auckland 1010, New Zealand"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5992-3681","authenticated-orcid":false,"given":"Ngaire","family":"Kerse","sequence":"additional","affiliation":[{"name":"School of Population Health, Faculty of Medical and Health Sciences, University of Auckland, Auckland 1023, New Zealand"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7135-1850","authenticated-orcid":false,"given":"Ruth","family":"Teh","sequence":"additional","affiliation":[{"name":"School of Population Health, Faculty of Medical and Health Sciences, University of Auckland, Auckland 1023, New Zealand"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1154-4751","authenticated-orcid":false,"given":"Silvia","family":"Del Din","sequence":"additional","affiliation":[{"name":"Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4HH, UK"},{"name":"National Institute for Health and Care Research (NIHR), Newcastle Biomedical Research Centre (BRC), Newcastle University, The Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne NE2 4HH, UK"}]}],"member":"1968","published-online":{"date-parts":[[2023,5,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1186\/s12966-017-0525-8","article-title":"Sedentary behavior research network (SBRN)\u2013terminology consensus project process and outcome","volume":"14","author":"Tremblay","year":"2017","journal-title":"Int. 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