{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T21:55:25Z","timestamp":1787954125823,"version":"build-2784847793"},"reference-count":21,"publisher":"Cambridge University Press (CUP)","issue":"7","license":[{"start":{"date-parts":[[2023,1,26]],"date-time":"2023-01-26T00:00:00Z","timestamp":1674691200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":["cambridge.org"],"crossmark-restriction":true},"short-container-title":["Br J Nutr"],"published-print":{"date-parts":[[2023,10,14]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Smartphone applications (SPA) now offer the ability to provide accessible in-home monitoring of relevant individual health biomarkers. Previous cross-sectional validations of similar technologies have reported acceptable accuracy with high-grade body composition assessments; this research assessed longitudinal agreement of a novel SPA across a self-managed weight loss intervention of thirty-eight participants (twenty-one males, seventeen females). Estimations of body mass (BM), body fat percentage (BF%), fat-free mass (FFM) and waist circumference (WC) from the SPA were compared with ground truth (GT) measures from a dual-energy X-ray absorptiometry scanner and expert technician measurement. Small mean differences (MD) and standard error of estimate (SEE) were observed between method deltas (\u0394BM: MD = 0\u00b712 kg, SEE = 2\u00b782 kg; \u0394BF%: MD = 0\u00b706 %, SEE = 1\u00b765 %; \u0394FFM: MD = 0\u00b717 kg, SEE = 1\u00b765 kg; \u0394WC: MD = 1\u00b716 cm, SEE = 2\u00b752 cm). Concordance correlation coefficient (CCC) assessed longitudinal agreement between the SPA and GT methods, with moderate concordance (CCC: 0\u00b755\u20130\u00b773) observed for all measures. The novel SPA may not be interchangeable with high-accuracy medical scanning methods yet offers significant benefits in cost, accessibility and user comfort, in conjunction with the ability to monitor body shape and composition estimates over time.<\/jats:p>","DOI":"10.1017\/s0007114523000259","type":"journal-article","created":{"date-parts":[[2023,1,26]],"date-time":"2023-01-26T08:36:03Z","timestamp":1674722163000},"page":"1260-1266","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":7,"title":["Longitudinal concordance of body composition and anthropometric assessment by a novel smartphone application across a 12-week self-managed weight loss intervention"],"prefix":"10.1017","volume":"130","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6608-9560","authenticated-orcid":false,"given":"Marc K.","family":"Smith","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan M. 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