Evidence map›Paper›PMID 34090467›Full record

ArticleThe international journal of behavioral nutrition and physical activity2021

Reliability of GENEActiv accelerometers to estimate sleep, physical activity, and sedentary time in children.

Devan Antczak, Chris Lonsdale, Borja Del Pozo Cruz, Philip Parker, Taren Sanders

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In one paragraph

Article in The international journal of behavioral nutrition and physical activity, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.

0numbers the graph read from it
0cells of the map it votes in
26citing papers in PubMed
–field-weighted citation impact
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

26 citing papers in PubMed.

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  11. Digital assessment of real-world walking in people with impaired mobility: How many hours and days are needed?The international journal of behavioral nutrition and physical activity · 2025
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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

5 authors.

Devan AntczakInstitute for Positive Psychology and Education, Australian Catholic University, PO Box 968, Level 10 33 Berry Street, New South Wales, 2060, North Sydney, Australia.
Chris LonsdaleInstitute for Positive Psychology and Education, Australian Catholic University, PO Box 968, Level 10 33 Berry Street, New South Wales, 2060, North Sydney, Australia.
Borja Del Pozo CruzInstitue of Sport Sciences and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark.
Philip ParkerInstitute for Positive Psychology and Education, Australian Catholic University, PO Box 968, Level 10 33 Berry Street, New South Wales, 2060, North Sydney, Australia.
Taren SandersInstitute for Positive Psychology and Education, Australian Catholic University, PO Box 968, Level 10 33 Berry Street, New South Wales, 2060, North Sydney, Australia. taren.sanders@acu.edu.au.ORCID 0000-0002-4504-6008

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundReliable estimates of habitual sleep, physical activity, and sedentary time are essential to investigate the associations between these behaviours and health outcomes. While the number of days needed and hours/day for estimates of physical activity and sedentary time are generally known, the criteria for sleep estimates are more uncertain. The objective of this study was to identify the number of nights needed to obtain reliable estimates of habitual sleep behaviour using the GENEActiv wrist worn accelerometer. The number of days to obtain reliable estimate of physical activity was also examined.

methodsData was used from a two-year longitudinal study. Children wore an accelerometer for up to 8 days 24 h/day across three timepoints. The sample included 2,745 children (51 % girls) between the ages of 7-12-years-old (mean = 9.8 years, SD = 1.1 year) with valid accelerometer data from any timepoint. Reliability estimates were calculated for sleep duration, sleep efficiency, sleep onset, wake time, time in bed, light physical activity, moderate physical activity, moderate-to-vigorous physical activity, vigorous physical activity, and sedentary time.

resultsIntraclass correlations and the Spearman Brown prophecy formula were used to determine the nights and days needed for reliable estimates. We found that between 3 and 5 nights were needed to achieve acceptable reliability (ICC = 0.7) in sleep outcomes, while physical activity and sedentary time outcomes required between 3 and 4 days.

conclusionsTo obtain reliable estimates, researchers should consider these minimum criteria when designing their studies and prepare strategies to ensure sufficient wear time compliance.

Indexed as

Monitoring, PhysiologicSedentary BehaviorAccelerometryChildExerciseFemaleFitness TrackersHumansLongitudinal StudiesMaleReproducibility of ResultsSleepMovement BehaviourObjective MeasurementYouth

Identifiers

PMID34090467
PMCPMC8180134

What OpenQuestion holds

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LicenceCC BY
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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.