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Validity and reliability of the Fitbit Zip as a measure of preschool children’s step count

Catherine A Sharp, Kelly Mackintosh Orcid Logo, Mihela Erjavec, Duncan M Pascoe, Pauline J Horne

BMJ Open Sport & Exercise Medicine, Volume: 3, Issue: 1, Start page: e000272

Swansea University Author: Kelly Mackintosh Orcid Logo

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DOI (Published version): 10.1136/bmjsem-2017-000272

Abstract

Objectives Validation of physical activity measurement tools is essential to determine the relationship between physical activity and health in preschool children, but research to date has not focused on this priority. The aims of this study were to ascertain inter-rater reliability of observer step...

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Published in: BMJ Open Sport & Exercise Medicine
ISSN: 2055-7647
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa35246
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2018-03-05T14:49:48.4248989</datestamp><bib-version>v2</bib-version><id>35246</id><entry>2017-09-13</entry><title>Validity and reliability of the Fitbit Zip as a measure of preschool children&#x2019;s step count</title><swanseaauthors><author><sid>bdb20e3f31bcccf95c7bc116070c4214</sid><ORCID>0000-0003-0355-6357</ORCID><firstname>Kelly</firstname><surname>Mackintosh</surname><name>Kelly Mackintosh</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2017-09-13</date><deptcode>STSC</deptcode><abstract>Objectives Validation of physical activity measurement tools is essential to determine the relationship between physical activity and health in preschool children, but research to date has not focused on this priority. The aims of this study were to ascertain inter-rater reliability of observer step count, and interdevice reliability and validity of Fitbit Zip accelerometer step counts in preschool children.Methods Fifty-six children aged 3&#x2013;4 years (29 girls) recruited from 10 nurseries in North Wales, UK, wore two Fitbit Zip accelerometers while performing a timed walking task in their childcare settings. Accelerometers were worn in secure pockets inside a custom-made tabard. Video recordings enabled two observers to independently code the number of steps performed in 3&#x2009;min by each child during the walking task. Intraclass correlations (ICCs), concordance correlation coefficients, Bland-Altman plots and absolute per cent error were calculated to assess the reliability and validity of the consumer-grade device.Results An excellent ICC was found between the two observer codings (ICC=1.00) and the two Fitbit Zips (ICC=0.91). Concordance between the Fitbit Zips and observer counts was also high (r=0.77), with an acceptable absolute per cent error (6%&#x2013;7%). Bland-Altman analyses identified a bias for Fitbit 1 of 22.8&#xB1;19.1 steps with limits of agreement between &#x2212;14.7 and 60.2 steps, and a bias for Fitbit 2 of 25.2&#xB1;23.2 steps with limits of agreement between &#x2212;20.2 and 70.5 steps.Conclusions Fitbit Zip accelerometers are a reliable and valid method of recording preschool children&#x2019;s step count in a childcare setting.</abstract><type>Journal Article</type><journal>BMJ Open Sport &amp; Exercise Medicine</journal><volume>3</volume><journalNumber>1</journalNumber><paginationStart>e000272</paginationStart><publisher/><issnElectronic>2055-7647</issnElectronic><keywords/><publishedDay>11</publishedDay><publishedMonth>10</publishedMonth><publishedYear>2017</publishedYear><publishedDate>2017-10-11</publishedDate><doi>10.1136/bmjsem-2017-000272</doi><url/><notes/><college>COLLEGE NANME</college><department>Sport and Exercise Sciences</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>STSC</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2018-03-05T14:49:48.4248989</lastEdited><Created>2017-09-13T14:43:38.4775859</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences</level></path><authors><author><firstname>Catherine A</firstname><surname>Sharp</surname><order>1</order></author><author><firstname>Kelly</firstname><surname>Mackintosh</surname><orcid>0000-0003-0355-6357</orcid><order>2</order></author><author><firstname>Mihela</firstname><surname>Erjavec</surname><order>3</order></author><author><firstname>Duncan M</firstname><surname>Pascoe</surname><order>4</order></author><author><firstname>Pauline J</firstname><surname>Horne</surname><order>5</order></author></authors><documents><document><filename>0035246-09012018104015.pdf</filename><originalFilename>sharp2017v2.pdf</originalFilename><uploaded>2018-01-09T10:40:15.6430000</uploaded><type>Output</type><contentLength>618397</contentLength><contentType>application/pdf</contentType><version>Version of Record</version><cronfaStatus>true</cronfaStatus><embargoDate>2018-01-09T00:00:00.0000000</embargoDate><copyrightCorrect>true</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807>
spelling 2018-03-05T14:49:48.4248989 v2 35246 2017-09-13 Validity and reliability of the Fitbit Zip as a measure of preschool children’s step count bdb20e3f31bcccf95c7bc116070c4214 0000-0003-0355-6357 Kelly Mackintosh Kelly Mackintosh true false 2017-09-13 STSC Objectives Validation of physical activity measurement tools is essential to determine the relationship between physical activity and health in preschool children, but research to date has not focused on this priority. The aims of this study were to ascertain inter-rater reliability of observer step count, and interdevice reliability and validity of Fitbit Zip accelerometer step counts in preschool children.Methods Fifty-six children aged 3–4 years (29 girls) recruited from 10 nurseries in North Wales, UK, wore two Fitbit Zip accelerometers while performing a timed walking task in their childcare settings. Accelerometers were worn in secure pockets inside a custom-made tabard. Video recordings enabled two observers to independently code the number of steps performed in 3 min by each child during the walking task. Intraclass correlations (ICCs), concordance correlation coefficients, Bland-Altman plots and absolute per cent error were calculated to assess the reliability and validity of the consumer-grade device.Results An excellent ICC was found between the two observer codings (ICC=1.00) and the two Fitbit Zips (ICC=0.91). Concordance between the Fitbit Zips and observer counts was also high (r=0.77), with an acceptable absolute per cent error (6%–7%). Bland-Altman analyses identified a bias for Fitbit 1 of 22.8±19.1 steps with limits of agreement between −14.7 and 60.2 steps, and a bias for Fitbit 2 of 25.2±23.2 steps with limits of agreement between −20.2 and 70.5 steps.Conclusions Fitbit Zip accelerometers are a reliable and valid method of recording preschool children’s step count in a childcare setting. Journal Article BMJ Open Sport & Exercise Medicine 3 1 e000272 2055-7647 11 10 2017 2017-10-11 10.1136/bmjsem-2017-000272 COLLEGE NANME Sport and Exercise Sciences COLLEGE CODE STSC Swansea University 2018-03-05T14:49:48.4248989 2017-09-13T14:43:38.4775859 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences Catherine A Sharp 1 Kelly Mackintosh 0000-0003-0355-6357 2 Mihela Erjavec 3 Duncan M Pascoe 4 Pauline J Horne 5 0035246-09012018104015.pdf sharp2017v2.pdf 2018-01-09T10:40:15.6430000 Output 618397 application/pdf Version of Record true 2018-01-09T00:00:00.0000000 true eng
title Validity and reliability of the Fitbit Zip as a measure of preschool children’s step count
spellingShingle Validity and reliability of the Fitbit Zip as a measure of preschool children’s step count
Kelly Mackintosh
title_short Validity and reliability of the Fitbit Zip as a measure of preschool children’s step count
title_full Validity and reliability of the Fitbit Zip as a measure of preschool children’s step count
title_fullStr Validity and reliability of the Fitbit Zip as a measure of preschool children’s step count
title_full_unstemmed Validity and reliability of the Fitbit Zip as a measure of preschool children’s step count
title_sort Validity and reliability of the Fitbit Zip as a measure of preschool children’s step count
author_id_str_mv bdb20e3f31bcccf95c7bc116070c4214
author_id_fullname_str_mv bdb20e3f31bcccf95c7bc116070c4214_***_Kelly Mackintosh
author Kelly Mackintosh
author2 Catherine A Sharp
Kelly Mackintosh
Mihela Erjavec
Duncan M Pascoe
Pauline J Horne
format Journal article
container_title BMJ Open Sport & Exercise Medicine
container_volume 3
container_issue 1
container_start_page e000272
publishDate 2017
institution Swansea University
issn 2055-7647
doi_str_mv 10.1136/bmjsem-2017-000272
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences
document_store_str 1
active_str 0
description Objectives Validation of physical activity measurement tools is essential to determine the relationship between physical activity and health in preschool children, but research to date has not focused on this priority. The aims of this study were to ascertain inter-rater reliability of observer step count, and interdevice reliability and validity of Fitbit Zip accelerometer step counts in preschool children.Methods Fifty-six children aged 3–4 years (29 girls) recruited from 10 nurseries in North Wales, UK, wore two Fitbit Zip accelerometers while performing a timed walking task in their childcare settings. Accelerometers were worn in secure pockets inside a custom-made tabard. Video recordings enabled two observers to independently code the number of steps performed in 3 min by each child during the walking task. Intraclass correlations (ICCs), concordance correlation coefficients, Bland-Altman plots and absolute per cent error were calculated to assess the reliability and validity of the consumer-grade device.Results An excellent ICC was found between the two observer codings (ICC=1.00) and the two Fitbit Zips (ICC=0.91). Concordance between the Fitbit Zips and observer counts was also high (r=0.77), with an acceptable absolute per cent error (6%–7%). Bland-Altman analyses identified a bias for Fitbit 1 of 22.8±19.1 steps with limits of agreement between −14.7 and 60.2 steps, and a bias for Fitbit 2 of 25.2±23.2 steps with limits of agreement between −20.2 and 70.5 steps.Conclusions Fitbit Zip accelerometers are a reliable and valid method of recording preschool children’s step count in a childcare setting.
published_date 2017-10-11T03:43:48Z
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