Evidence map›Paper›PMID 32534820›Full record

ArticleSleep health2020

Changes in sleep and activity from age 15 to 17 in students with traditional and college-style school schedules.

Runa Stefansdottir, Vaka Rognvaldsdottir, Sunna Gestsdottir, Sigridur L Gudmundsdottir, Kong Y Chen, Robert J Brychta, Erlingur Johannsson

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 6 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
6citing papers in PubMed, 2 pooled it
1.2field-weighted citation impact, top 19% 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

6 citing papers in PubMed, 2 syntheses or guidelines pooled it, 11 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Article
  4. Article
  5. Article
  6. Article
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.

Runa StefansdottirCenter of Sport and Health Sciences, University of Iceland, Reykjavik, Iceland.
Vaka RognvaldsdottirCenter of Sport and Health Sciences, University of Iceland, Reykjavik, Iceland.
Sunna GestsdottirCenter of Sport and Health Sciences, University of Iceland, Reykjavik, Iceland.
Sigridur L GudmundsdottirCenter 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.
Robert J BrychtaDiabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA. Electronic address: brychtar@niddk.nih.gov.
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.
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
Role of BK-Beta 1 in flow-dependent K+ secretion in the CNTR01DK071014 · NIDDK · UNIVERSITY OF NEBRASKA MEDICAL CENTER · PI SANSOM, STEVEN · 2007 to 2015
$2.7M
HTS for Detection of deltaF508 CFTR at the Cell SurfaceR01DK071013 · NIDDK · UNIV OF NORTH CAROLINA CHAPEL HILL · PI RIORDAN, JOHN R · 2005 to 2007
$747k
Intramural NIH HHS Z99 DK999999NIDDK NIH HHS R01 DK071013NIDDK NIH HHS R01 DK071014
6 · The paper itself

Abstract

objectivesSleep duration and physical activity decline with age during adolescence. Earlier school schedules may contribute to these declines. The aim of this longitudinal study was to track changes in sleep and activity of Icelandic youth from primary to secondary school and compare students who enrolled in secondary schools with traditional and college-style schedules.

methodsWe measured free-living sleep and activity with wrist actigraphy and body composition by dual-energy x-ray absorptiometry in 145 students at age 15 and age 17, when 58% attended schools with college-style scheduling. Differences from 15 to 17 and between students of different school structures were assessed with mixed-effect models.

resultsActigraphs were worn for 7.1 ± 0.4 nights at 15 and 6.9 ± 0.4 nights at 17. Overall, sleep duration decreased from 6.6 ± 0.7 h/night to 6.2 ± 0.7 h/night from age 15 to 17 (P < .001). Students with traditional schedules reduced school-night sleep duration 26 min/night at follow-up (P< .001), while sleep duration did not change for college-style students. All students went to bed later on school nights at follow-up, but only college-style students rose later. Sleep efficiency and awakenings did not differ by schedule-type. Neither sex changed body fat percentage, but average school-day activity decreased by 19% (P< .001) on follow-up and did not differ by schedule-type.

conclusionsOver the 2-year period, adolescents decreased weekly sleep duration and activity, but only those continuing traditional schedules reduced school-night sleep. This suggests greater individual control of school schedule may preserve sleep duration in this age group, which may be beneficial during the transition into adulthood.

Indexed as

ExerciseSleepAdolescentAge FactorsFemaleHumansLongitudinal StudiesMaleSchoolsStudentsTime FactorsAccelerometerAdolescentsBody compositionPhysical activitySchool scheduleSleep duration

Identifiers

PMID32534820
PMCPMC7726031
OpenAlexW3035120535

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.