Comparison of a Thigh-Worn Accelerometer Algorithm With Diary Estimates of Time in Bed and Time Asleep: The 1970 British Cohort Study

Inan-Eroglu, E; Huang, B-H; Shepherd, L; Pearson, N; Koster, A; Palm, P; Cistulli, PA; Hamer, M; Stamatakis, E

Comparison of a Thigh-Worn Accelerometer Algorithm With Diary Estimates of Time in Bed and Time Asleep: The 1970 British Cohort Study

Inan-Eroglu, E Huang, B-H Shepherd, L Pearson, N Koster, A Palm, P Cistulli, PA Hamer, M Stamatakis, E

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Publisher:: Human Kinetics
Publication Type:: Journal Article
Citation:: Journal for the Measurement of Physical Behaviour, 2021, 4, (1), pp. 60-67
Issue Date:: 2021-03-01

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Field	Value	Language
dc.contributor.author	Inan-Eroglu, E
dc.contributor.author	Huang, B-H
dc.contributor.author	Shepherd, L
dc.contributor.author	Pearson, N
dc.contributor.author	Koster, A
dc.contributor.author	Palm, P
dc.contributor.author	Cistulli, PA
dc.contributor.author	Hamer, M
dc.contributor.author	Stamatakis, E
dc.date.accessioned	2022-10-24T01:57:20Z
dc.date.available	2022-10-24T01:57:20Z
dc.date.issued	2021-03-01
dc.identifier.citation	Journal for the Measurement of Physical Behaviour, 2021, 4, (1), pp. 60-67
dc.identifier.issn	2575-6605
dc.identifier.issn	2575-6613
dc.identifier.uri	http://hdl.handle.net/10453/162623
dc.description.abstract	<jats:p><jats:bold>Background</jats:bold>: Thigh-worn accelerometers have established reliability and validity for measurement of free-living physical activity-related behaviors. However, comparisons of methods for measuring sleep and time in bed using the thigh-worn accelerometer are rare. The authors compared the thigh-worn accelerometer algorithm that estimates time in bed with the output of a sleep diary (time in bed and time asleep). <jats:bold>Methods</jats:bold>: Participants (<jats:italic>N</jats:italic> = 5,498), from the 1970 British Cohort Study, wore an activPAL device on their thigh continuously for 7 days and completed a sleep diary. Bland–Altman plots and Pearson correlation coefficients were used to examine associations between the algorithm derived and diary time in bed and asleep. <jats:bold>Results</jats:bold>: The algorithm estimated acceptable levels of agreement with time in bed when compared with diary time in bed (mean bias of −11.4 min; limits of agreement −264.6 to 241.8). The algorithm-derived time in bed overestimated diary sleep time (mean bias of 55.2 min; limits of agreement −204.5 to 314.8 min). Algorithm and sleep diary are reasonably correlated (ρ = .48, 95% confidence interval [.45, .52] for women and ρ = .51, 95% confidence interval [.47, .55] for men) and provide broadly comparable estimates of time in bed but not for sleep time. <jats:bold>Conclusions</jats:bold>: The algorithm showed acceptable estimates of time in bed compared with diary at the group level. However, about half of the participants were outside of the ±30 min difference of a clinically relevant limit at an individual level.</jats:p>
dc.language	en
dc.publisher	Human Kinetics
dc.relation.ispartof	Journal for the Measurement of Physical Behaviour
dc.relation.isbasedon	10.1123/jmpb.2020-0033
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Comparison of a Thigh-Worn Accelerometer Algorithm With Diary Estimates of Time in Bed and Time Asleep: The 1970 British Cohort Study
dc.type	Journal Article
utslib.citation.volume	4
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Health
pubs.organisational-group	/University of Technology Sydney/Faculty of Health/Public Health
utslib.copyright.status	closed_access	*
dc.date.updated	2022-10-24T01:57:19Z
pubs.issue	1
pubs.publication-status	Published
pubs.volume	4
utslib.citation.issue	1

Abstract:

Background: Thigh-worn accelerometers have established reliability and validity for measurement of free-living physical activity-related behaviors. However, comparisons of methods for measuring sleep and time in bed using the thigh-worn accelerometer are rare. The authors compared the thigh-worn accelerometer algorithm that estimates time in bed with the output of a sleep diary (time in bed and time asleep). Methods: Participants (N = 5,498), from the 1970 British Cohort Study, wore an activPAL device on their thigh continuously for 7 days and completed a sleep diary. Bland–Altman plots and Pearson correlation coefficients were used to examine associations between the algorithm derived and diary time in bed and asleep. Results: The algorithm estimated acceptable levels of agreement with time in bed when compared with diary time in bed (mean bias of −11.4 min; limits of agreement −264.6 to 241.8). The algorithm-derived time in bed overestimated diary sleep time (mean bias of 55.2 min; limits of agreement −204.5 to 314.8 min). Algorithm and sleep diary are reasonably correlated (ρ = .48, 95% confidence interval [.45, .52] for women and ρ = .51, 95% confidence interval [.47, .55] for men) and provide broadly comparable estimates of time in bed but not for sleep time. Conclusions: The algorithm showed acceptable estimates of time in bed compared with diary at the group level. However, about half of the participants were outside of the ±30 min difference of a clinically relevant limit at an individual level.

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http://hdl.handle.net/10453/162623