Evidence map›Paper›PMID 32331863›Full record

ArticleSleep health2020

Less screen time and more physical activity is associated with more stable sleep patterns among Icelandic adolescents.

Soffia M Hrafnkelsdottir, Robert J Brychta, Vaka Rognvaldsdottir, Kong Y Chen, Erlingur Johannsson, Sigridur L Gudmundsdottir, Sigurbjorn A Arngrimsson

Open access · greenAbstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Sleep health, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed, 1 pooled it
2.5field-weighted citation impact, top 11% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

15 citing papers in PubMed, 1 synthesis or guideline pooled it, 29 citations in OpenAlex.

  1. Pooled it
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  7. Interactive Screen-Based Activities Predict Worse Actigraphic Sleep Health That Night Among Adolescents.The Journal of adolescent health : official publication of the Society for Adolescent Medicine · 2024
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 2 institutions in 3 countries.

Soffia M HrafnkelsdottirCenter of Sport and Health Sciences, University of Iceland, Reykjavik, Iceland. Electronic address: soffiahr@simnet.is.
Robert J BrychtaDiabetes, Endocrinology and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA.
Vaka RognvaldsdottirCenter of Sport and Health Sciences, University of Iceland, Reykjavik, Iceland.
Kong Y ChenDiabetes, Endocrinology and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA.
Erlingur JohannssonCenter of Sport and Health Sciences, University of Iceland, Reykjavik, Iceland; Department of Sport and Physical Activity, Western Norway University of Applied Sciences, Bergen, Norway.
Sigridur L GudmundsdottirCenter of Sport and Health Sciences, University of Iceland, Reykjavik, Iceland.
Sigurbjorn A ArngrimssonCenter of Sport and Health Sciences, University of Iceland, Reykjavik, Iceland.
University of Iceland · ISNational Institute of Diabetes and Digestive and Kidney Diseases · US

Funding

Metabolic Research Core: energy balance and obesity studiesZICDK071013 · NIDDK · NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES · PI CHEN, KONG · 2009 to 2025
$12.3M
Intramural NIH HHS Z99 DK999999
6 · The paper itself

Abstract

objectivesEmerging evidence suggests that inconsistent sleep may affect physical and psychological health. Thus, it is important to identify modifiable determinants of sleep variability. Screen time and physical activity are both thought to affect sleep, but studies of their relationship to sleep variability using objective measures are lacking. We examined cross-sectional associations between these variables in mid-teen adolescents using objectively measured sleep and activity.

methodsWrist-worn accelerometers were used to measure one week of sleep and activity in 315 tenth grade students (mean age 15.8y) from six Reykjavík compulsory schools. Participants reported their daily hours of screen time. Regression analysis was used to explore associations of screen time and physical activity with variability in duration, quality, and timing of sleep, adjusting for DXA-measured body fat percentage, parental education, and physical activity or screen time.

resultsScreen time, especially game playing, was associated with variability in duration, timing, and quality of sleep, most strongly with variation in bedtime. Physical activity was inversely associated with variability in duration, timing, and quality of sleep, most strongly with variation in the number of awakenings. Boys had less stable sleep patterns and higher screen time than girls, and sex-specific associations of screen time with sleep variability parameters were significant for boys only.

conclusionsLess screen time and more physical activity were independently associated with less sleep variability among mid-teen adolescents. Our results indicate that encouraging youngsters toward an active lifestyle with limited screen use may be important to achieve more consistent sleep.

Indexed as

ExerciseScreen TimeSleepAdolescentCross-Sectional StudiesFemaleHumansIcelandMaleSchoolsStudentsTime FactorsAdolescentsObjective measuresPhysical activityScreen timeSleep variability

Identifiers

PMID32331863
PMCPMC7575609
OpenAlexW3017480595

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.