Cited by 49Impact of Technology on AdolescentsSleep and related disordersPhysical Activity and Health

Temporal association between objectively measured smartphone usage, sleep quality and physical activity among Chinese adolescents and young adults.

Lee, Paul H., Tse, Andy C. Y., Wu, Cynthia S. T., Mak, Yim Wah, Lee, Uichin·2021·Journal of Sleep Research

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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Crossref · 10.1111/jsr.13213

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  • Most research examined screen use over the whole day rather than that more immediate to bedtime, which is probably more detrimental to sleep.

    “Most research examined screen use over the whole day rather than that more immediate to bedtime, which is probably more detrimental to sleep.14,15,16”

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Authors
Lee, P. H., Tse, A. C. Y., Wu, C. S. T., Mak, Y. W., & Lee, U.
Affiliations
  • Hong Kong Polytechnic University (HK)
  • Education University of Hong Kong (HK)
  • Korea Advanced Institute of Science and Technology (KR)
Corresponding author
Lee, Paul H.
Venue
Journal of Sleep Research
Publisher
Wiley
Published
2020-10-13
Volume
30
Issue
4
Pages
e13213-e13213
ISSN
  • 0962-1105 (ISSN-L)
  • 1365-2869
OpenAlex
W3091868590
Cited by
49
References
52
Citations by year
2026: 11 · 2025: 7 · 2024: 14 · 2023: 15 · 2022: 1 · 2021: 1
FWCI
5.69
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Sleep Research (publishedVersion)
  • PubMed (publishedVersion)
  • ePrints Soton (University of Southampton) (submittedVersion)
  • PolyU Institutional Research Archive (Hong Kong Polytechnic University) (submittedVersion)
Funders
Research Grants Council, University Grants Committee (PolyU 251056/16M)
Topics
  • Social Sciences › Sociology and Political Science › Impact of Technology on Adolescents
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
Keywords
smartphone use, sleep quality, physical activity, adolescents, young adults, sleep duration, social media use, screen time, step count, sleep efficiency, wake after sleep onset, moderate-to-vigorous physical activity, Hong Kong
MeSH terms
Smartphone, Adolescent, Adult, Child, China, Female, Humans, Male, Sleep, Exercise, Young Adult

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