{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,27]],"date-time":"2026-10-27T09:41:20Z","timestamp":1793094080677,"version":"4.5.0"},"reference-count":21,"publisher":"Springer Science and Business Media LLC","issue":"8","license":[{"start":{"date-parts":[[2023,5,25]],"date-time":"2023-05-25T00:00:00Z","timestamp":1684972800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2023,5,25]],"date-time":"2023-05-25T00:00:00Z","timestamp":1684972800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"name":"Russells Hall Hospital Charitable Research Fund"},{"name":"Medical Research Council Versus Arthritis Centre for Musculoskeletal Ageing Research","award":["MR\/P021220\/1"],"award-info":[{"award-number":["MR\/P021220\/1"]}]},{"name":"Experimental Medicine Challenge grant from the Medical Research Council","award":["MR\/N026977\/1"],"award-info":[{"award-number":["MR\/N026977\/1"]}]},{"name":"Wellcome Trust Institutional Strategic Support Fund"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Rheumatol Int"],"abstract":"<jats:title>Abstract<\/jats:title><jats:p>This study aimed to determine the minimum number of days required to reliably estimate free-living sedentary time, light-intensity physical activity (LPA) and moderate-intensity physical activity (MPA) using accelerometer data in people with Rheumatoid Arthritis (RA), according to Disease Activity Score-28-C-reactive protein (DAS-28-CRP). Secondary analysis of two existing RA cohorts with controlled (cohort 1) and active (cohort 2) disease was undertaken. People with RA were classified as being in remission (DAS-28-CRP\u2009&lt;\u20092.4,<jats:italic>n<\/jats:italic>\u2009=\u20099), or with low (DAS-28-CRP\u2009\u2265\u20092.4\u2014\u2264\u20093.2,<jats:italic>n<\/jats:italic>\u2009=\u200915), moderate (DAS-28-CRP\u2009&gt;\u20093.2\u2014\u2264\u20095.1,<jats:italic>n<\/jats:italic>\u2009=\u200941) or high (DAS-28-CRP\u2009&gt;\u20095.1,<jats:italic>n<\/jats:italic>\u2009=\u200916) disease activity. Participants wore an ActiGraph accelerometer on their right hip for 7\u00a0days during waking hours. Validated RA-specific cut-points were applied to accelerometer data to estimate free-living sedentary time, LPA and MPA (%\/day). Single-day intraclass correlation coefficients (ICC) were calculated and used in the Spearman Brown prophecy formula to determine the number of monitoring days required to achieve measurement reliability (ICC\u2009\u2265\u20090.80) for each group. The remission group required\u2009\u2265\u20094 monitoring days to achieve an ICC\u2009\u2265\u20090.80 for sedentary time and LPA, with low, moderate and high disease activity groups requiring\u2009\u2265\u20093 monitoring days to reliably estimate these behaviours. The monitoring days required for MPA were more variable across disease activity groups (remission\u2009=\u2009\u2009\u2265\u20093\u00a0days; low\u2009=\u2009\u2009\u2265\u20092\u00a0days; moderate\u2009=\u2009\u2009\u2265\u20093\u00a0days; high\u2009=\u2009\u2009\u2265\u20095\u00a0days). We\u00a0conclude\u00a0at least 4 monitoring days will reliably estimate sedentary time and LPA in RA, across the whole spectrum of disease activity. However, to reliably estimate behaviours across the movement continuum (sedentary time, LPA, MPA), at least 5 monitoring days are required.<\/jats:p>","DOI":"10.1007\/s00296-023-05342-1","type":"journal-article","created":{"date-parts":[[2023,5,25]],"date-time":"2023-05-25T15:02:24Z","timestamp":1685026944000},"page":"1459-1465","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Number of days required to measure sedentary time and physical activity using accelerometery in rheumatoid arthritis: a reliability study"],"prefix":"10.1007","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2215-6001","authenticated-orcid":false,"given":"Ciara M.","family":"O\u2019Brien","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0828-6176","authenticated-orcid":false,"given":"George D.","family":"Kitas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4302-0899","authenticated-orcid":false,"given":"Fiona","family":"Rayner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6103-7056","authenticated-orcid":false,"given":"John D.","family":"Isaacs","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6735-2911","authenticated-orcid":false,"given":"Kenneth F.","family":"Baker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9909-8209","authenticated-orcid":false,"given":"Arthur G.","family":"Pratt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6924-6402","authenticated-orcid":false,"given":"Christopher D.","family":"Buckley","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1570-1232","authenticated-orcid":false,"given":"Karim","family":"Raza","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8164-6249","authenticated-orcid":false,"given":"Andrew","family":"Filer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1802-7311","authenticated-orcid":false,"given":"Stefan","family":"Siebert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6462-4280","authenticated-orcid":false,"given":"Iain","family":"McInnes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7919-7966","authenticated-orcid":false,"given":"Andrew","family":"McGucken","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3732-1348","authenticated-orcid":false,"given":"Sally A. 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All other authors declare that they have no conflict of interest.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the North East\u2013Newcastle and North Tyneside 1 Research Ethics Committee (17\/NE\/0386) and the Black Country (West Midlands) Research Ethics Committee (16\/WM\/0371).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"Informed consent was obtained from all individual participants included in the study.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}},{"value":"Not applicable.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to publish"}},{"value":"Part of this study\u2019s protocol has previously been published (O\u2019Brien et al., 2018). As a result, some of the text included herein may duplicate information reported in the prior publication.","order":6,"name":"Ethics","group":{"name":"EthicsHeading","label":"Transparency statements"}}]}}