dc.contributor |
Háskóli Íslands |
dc.contributor |
University of Iceland |
dc.contributor.author |
Brychta, Robert J. |
dc.contributor.author |
Rögnvaldsdóttir, Vaka |
dc.contributor.author |
Gudmundsdottir, Sigridur Lara |
dc.contributor.author |
Stefansdottir, Runa |
dc.contributor.author |
Hrafnkelsdóttir, Soffía Margrét |
dc.contributor.author |
Gestsdottir, Sunna |
dc.contributor.author |
Arngrímsson, Sigurbjörn Árni |
dc.contributor.author |
Chen, Kong Y. |
dc.contributor.author |
Jóhannsson, Erlingur |
dc.date.accessioned |
2021-03-08T10:20:24Z |
dc.date.available |
2021-03-08T10:20:24Z |
dc.date.issued |
2019-12-01 |
dc.identifier.citation |
Brychta, R. J., Rögnvaldsdóttir, V., Guðmundsdóttir, S. L., Stefánsdóttir, R., Hrafnkelsdóttir, S. M., Gestsdóttir, S., Arngrímsson, S. A., Chen, K. Y., & Jóhannsson, E. (2019). Longitudinal Change in Adolescent Bedtimes Measured by Self-Report and Actigraphy, Journal for the Measurement of Physical Behaviour, 2(4), 282-287. Retrieved Mar 4, 2021, from https://journals.humankinetics.com/view/journals/jmpb/2/4/article-p282.xml |
dc.identifier.issn |
2575-6605 |
dc.identifier.issn |
2575-6613 (eISSN) |
dc.identifier.uri |
https://hdl.handle.net/20.500.11815/2488 |
dc.description.abstract |
Introduction: Sleep is often quantified using self-report or actigraphy. Self-report is practical and less technically challenging, but prone to bias. We sought to determine whether these methods have comparable sensitivity to measure longitudinal changes in adolescent bedtimes. Methods: We measured one week of free-living sleep with wrist actigraphy and usual bedtime on school nights and non-school nights with self-report questionnaire in 144 students at 15 y and 17 y. Results: Self-reported and actigraphy-measured bedtimes were correlated with one another at 15 y and 17 y (p < .001), but reported bedtime was consistently earlier (>30 minutes, p < .001) and with wide inter-method confidence intervals (> ±106 minutes). Mean inter-method discrepancy did not differ on school nights at 15 y and 17 y but was greater at 17 y on non-school nights (p = .002). Inter-method discrepancy at 15 y was not correlated to that at 17 y. Mean change in self-reported school night bedtime from 15 y to 17 y did not differ from that by actigraphy, but self-reported bedtime changed less on non-school nights (p = .002). Two-year changes in self-reported bedtime did not correlate with changes measured by actigraphy. Conclusions: Although methods were correlated, consistently earlier self-reported bedtime suggests report-bias. More varied non-school night bedtimes challenge the accuracy of self-report and actigraphy, reducing sensitivity to change. On school nights, the methods did not differ in group-level sensitivity to changes in bedtime. However, lack of correlation between bedtime changes by each method suggests sensitivity to individual-level change was different. Methodological differences in sensitivity to individual- and group-level change should be considered in longitudinal studies of adolescent sleep patterns. |
dc.format.extent |
282-287 |
dc.language.iso |
en |
dc.publisher |
Human Kinetics |
dc.relation.ispartofseries |
Journal for the Measurement of Physical Behaviour;2(4) |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Accelerometer |
dc.subject |
Questionnaire |
dc.subject |
Sleep |
dc.subject |
Sleep onset |
dc.subject |
Teenagers |
dc.subject |
Unglingar |
dc.subject |
Svefnvenjur |
dc.subject |
Svefn |
dc.subject |
Spurningalistar |
dc.title |
Longitudinal Change in Adolescent Bedtimes Measured by Self-Report and Actigraphy |
dc.type |
info:eu-repo/semantics/article |
dcterms.license |
CC-BY-NC-4.0 |
dc.description.version |
Peer Reviewed |
dc.identifier.journal |
Journal for the Measurement of Physical Behaviour |
dc.identifier.doi |
10.1123/jmpb.2019-0021 |
dc.relation.url |
https://journals.humankinetics.com/view/journals/jmpb/2/4/article-p282.xml |
dc.contributor.department |
Deild heilsueflingar, íþrótta og tómstunda (HÍ) |
dc.contributor.department |
Faculty of Health Promotion, Sport and Leisure Studies (HÍ) |
dc.contributor.school |
Menntavísindasvið (HÍ) |
dc.contributor.school |
School of education (UI) |