Temporal association between objectively measured smartphone usage, sleep quality and physical activity among Chinese adolescents and young adults
Temporal association between objectively measured smartphone usage, sleep quality and physical activity among Chinese adolescents and young adults
We studied the association between objectively measured smartphone usage and objectively measured sleep quality and physical activity for seven consecutive days among Hong Kong adolescents and young adults aged 11–25 years (n = 357, 67% female). We installed an app that tracked the subjects’ smartphone usage and had them wear an ActiGraph GT3X accelerometer on their wrist to measure their sleep quality and physical activity level. Smartphone usage data were successfully obtained from 187 participants (52.4%). The participants on average spent 2 h 46 min per day on their smartphone. Multilevel regression showed that 1 min of daytime smartphone usage was associated with 0.07 min decrease in total sleeping time that night (p =.043, 95% confidence interval [CI]: −0.14, −0.003). Broken down for different usage purposes, 1 min of daytime social network usage and games and comics was associated with a 0.28 (p =.02, 95% CI: −0.52, −0.04) min and 0.18 min (p =.01, 95% CI: −0.32, −0.04) decrease in total sleeping time that night, respectively. One minute of daytime smartphone usage was associated with an increase of 4.55 steps in the number of steps (p =.001, 95% CI: 1.77, 7.34) on the next day. To conclude, time spent on a smartphone in the daytime was associated with total sleeping time that night and number of steps the next day, but was not associated with sleep efficiency, wake after sleep onset and moderate-to-vigorous-intensity activity (MVPA) among Hong Kong adolescents and young adults.
exercise, gaming, screen, smart device, smartphone monitoring, youth
Lee, Paul H.
02620eab-ae7f-4a1c-bad1-8a50e7e48951
Tse, Andy C.Y.
e0d6b2be-a736-43ac-b03e-d2d58a56e114
Wu, Cynthia S.T.
f66ae827-6a75-428b-ba4e-393d5f009e31
Mak, Yim Wah
f9179db7-631d-40ca-8a94-88547578de4c
Lee, Uichin
8ff0c7dd-06ee-4c6b-9400-c7949faab0b0
1 August 2021
Lee, Paul H.
02620eab-ae7f-4a1c-bad1-8a50e7e48951
Tse, Andy C.Y.
e0d6b2be-a736-43ac-b03e-d2d58a56e114
Wu, Cynthia S.T.
f66ae827-6a75-428b-ba4e-393d5f009e31
Mak, Yim Wah
f9179db7-631d-40ca-8a94-88547578de4c
Lee, Uichin
8ff0c7dd-06ee-4c6b-9400-c7949faab0b0
Lee, Paul H., Tse, Andy C.Y., Wu, Cynthia S.T., Mak, Yim Wah and Lee, Uichin
(2021)
Temporal association between objectively measured smartphone usage, sleep quality and physical activity among Chinese adolescents and young adults.
Journal of Sleep Research, 30 (4), [e13213].
(doi:10.1111/jsr.13213).
Abstract
We studied the association between objectively measured smartphone usage and objectively measured sleep quality and physical activity for seven consecutive days among Hong Kong adolescents and young adults aged 11–25 years (n = 357, 67% female). We installed an app that tracked the subjects’ smartphone usage and had them wear an ActiGraph GT3X accelerometer on their wrist to measure their sleep quality and physical activity level. Smartphone usage data were successfully obtained from 187 participants (52.4%). The participants on average spent 2 h 46 min per day on their smartphone. Multilevel regression showed that 1 min of daytime smartphone usage was associated with 0.07 min decrease in total sleeping time that night (p =.043, 95% confidence interval [CI]: −0.14, −0.003). Broken down for different usage purposes, 1 min of daytime social network usage and games and comics was associated with a 0.28 (p =.02, 95% CI: −0.52, −0.04) min and 0.18 min (p =.01, 95% CI: −0.32, −0.04) decrease in total sleeping time that night, respectively. One minute of daytime smartphone usage was associated with an increase of 4.55 steps in the number of steps (p =.001, 95% CI: 1.77, 7.34) on the next day. To conclude, time spent on a smartphone in the daytime was associated with total sleeping time that night and number of steps the next day, but was not associated with sleep efficiency, wake after sleep onset and moderate-to-vigorous-intensity activity (MVPA) among Hong Kong adolescents and young adults.
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More information
Accepted/In Press date: 16 September 2020
Published date: 1 August 2021
Additional Information:
Funding Information:
This study was funded by the General Research Fund Early Career Scheme (Ref: PolyU 251056/16M) from the University Grants Committee of the Hong Kong Special Administrative Region, China.
Funding Information:
This study was funded by the General Research Fund Early Career Scheme (Ref: PolyU 251056/16M) from the University Grants Committee of the Hong Kong Special Administrative Region, China. The authors would like to thank Mr Ming Wong (Hong Kong Polytechnic University) for data collection and data management of the current study.
Publisher Copyright:
© 2020 European Sleep Research Society
Keywords:
exercise, gaming, screen, smart device, smartphone monitoring, youth
Identifiers
Local EPrints ID: 475030
URI: http://eprints.soton.ac.uk/id/eprint/475030
ISSN: 0962-1105
PURE UUID: dcac2f63-1f5d-4907-afea-e98b451d1212
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Date deposited: 09 Mar 2023 17:32
Last modified: 18 Mar 2024 04:08
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Contributors
Author:
Paul H. Lee
Author:
Andy C.Y. Tse
Author:
Cynthia S.T. Wu
Author:
Yim Wah Mak
Author:
Uichin Lee
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