{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T19:01:32Z","timestamp":1785265292654,"version":"3.55.0"},"reference-count":49,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2022,7,13]],"date-time":"2022-07-13T00:00:00Z","timestamp":1657670400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Haemophilia"],"published-print":{"date-parts":[[2022,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>Measurement of physical activity (PA) using commercial activity trackers such as Fitbit devices has become increasingly popular, also for people with haemophilia (PWH). The accuracy of the Fitbit model Charge 3 has not yet been examined.<\/jats:p><\/jats:sec><jats:sec><jats:title>Aims<\/jats:title><jats:p>To compare the Fitbit Charge 3 against the research\u2010grade accelerometer ActiGraph GT3X\u2010BT in measuring average daily steps and minutes spent in different PA intensities.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Twenty\u2010four young PWH wore a wrist\u2010worn Fitbit Charge 3 and hip\u2010worn ActiGraph GT3X\u2010BT simultaneously for seven consecutive days in free\u2010living conditions. Correlation of and differences between the devices for daily averages of PA parameters were assessed using Pearson's correlation coefficient and paired <jats:italic>t<\/jats:italic>\u2010test, respectively. Agreement between devices was assessed using Bland\u2010Altman plots.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Twenty participants (mean age 21.8) were included in the analyses. We found moderate to high correlations between Fitbit and ActiGraph measured daily averages for all PA variables, but statistically significant differences between devices for all variables except daily minutes of moderate PA. Fitbit overestimated average daily steps, minutes of light, vigorous and moderate\u2010to\u2010vigorous PA. Bland\u2010Altman plots showed a measurement bias between devices for all parameters with increasing overestimation by the Fitbit for higher volumes of PA.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The Fitbit Charge 3 overestimated steps and minutes of light, moderate and moderate\u2010to\u2010vigorous PA as compared to the ActiGraph GT3X\u2010BT, and this bias increased with PA volume. The Fitbit should therefore be used with caution in research, and we advise users of the device to be cognizant\u00a0of this overestimation.<\/jats:p><\/jats:sec>","DOI":"10.1111\/hae.14624","type":"journal-article","created":{"date-parts":[[2022,7,13]],"date-time":"2022-07-13T19:49:35Z","timestamp":1657741775000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Comparison of free\u2010living physical activity measurements between ActiGraph GT3X\u2010BT and Fitbit Charge 3 in young people with haemophilia"],"prefix":"10.1111","volume":"28","author":[{"given":"Ruth Elise D.","family":"Matlary","sequence":"first","affiliation":[{"name":"Department of Haematology Oslo University Hospital  Oslo Norway"},{"name":"Institute of Clinical Medicine University of Oslo  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P\u00e5l Andr\u00e9","family":"Holme","sequence":"additional","affiliation":[{"name":"Department of Haematology Oslo University Hospital  Oslo Norway"},{"name":"Institute of Clinical Medicine University of Oslo  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heidi","family":"Glosli","sequence":"additional","affiliation":[{"name":"Centre for Rare Disorders Oslo University Hospital  Oslo Norway"},{"name":"Department of Paediatric Research Oslo University Hospital  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Corina Silvia","family":"Rueegg","sequence":"additional","affiliation":[{"name":"Oslo Centre for Biostatistics and Epidemiology Oslo University Hospital  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"May","family":"Grydeland","sequence":"additional","affiliation":[{"name":"Department of Physical Performance Norwegian School of Sport Sciences  Oslo 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