Inan-Eroglu, E;
Huang, B-H;
Shepherd, L;
Pearson, N;
Koster, A;
Palm, P;
Cistulli, P;
... Stamatakis, E; + view all
(2021)
Comparison of a thigh worn accelerometer algorithm with diary estimates of time in bed and time asleep: the 1970 British Cohort Study.
Journal for the Measurement of Physical Behaviour
, 4
(1)
pp. 60-67.
10.1123/jmpb.2020-0033.
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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.
| Type: | Article |
|---|---|
| Title: | Comparison of a thigh worn accelerometer algorithm with diary estimates of time in bed and time asleep: the 1970 British Cohort Study |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1123/jmpb.2020-0033 |
| Publisher version: | https://doi.org/10.1123/jmpb.2020-0033 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | activPAL; sleep; sleep diary |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10120536 |
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