Evidence map›Paper›PMID 34396981›Full record

ReviewThe Journal of clinical investigation2021

Human circadian variations.

Nicholas W Gentry, Liza H Ashbrook, Ying-Hui Fu, Louis J Ptáček

Open access · bronzeAbstract readReview
In one paragraph

Review in The Journal of clinical investigation, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 67 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
67citing papers in PubMed, 2 pooled it
7.7field-weighted citation impact, top 1% 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

67 citing papers in PubMed, 2 syntheses or guidelines pooled it, 121 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
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  6. Transcriptomics Insights into Spinal Cord Injury for Therapy Development.International journal of molecular sciences · 2026
    Review
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7 more citing papers are in PubMed but not listed here.

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

4 authors at 1 institution in 1 country.

Nicholas W GentryDepartment of Neurology.
Liza H AshbrookDepartment of Neurology.
Ying-Hui FuDepartment of Neurology.
Louis J PtáčekDepartment of Neurology.
Center for Neurosciences · US

Funding

GENETICS AND MOLECULAR CHARACTERIZATION OF ASPSR01HL059596 · NHLBI · UNIVERSITY OF UTAH · PI PTACEK, LOUIS J. · 1997 to 2012
$5.2M
Investigating the neurocircuitry of sleep duration regulationR01NS104782 · NINDS · UNIVERSITY OF CALIFORNIA, SAN FRANCISCO · PI FU, YING-HUI · 2018 to 2022
$3.0M
Probing genetics and biology of human circadian functionR01NS099333 · NINDS · UNIVERSITY OF CALIFORNIA, SAN FRANCISCO · PI PTACEK, LOUIS J. · 2017 to 2021
$2.9M
Investigating Genetics of Human Natural Short SleepersR01NS072360 · NINDS · UNIVERSITY OF CALIFORNIA, SAN FRANCISCO · PI FU, YING-HUI · 2011 to 2015
$2.2M
NHLBI NIH HHS R01 HL059596NINDS NIH HHS R01 NS072360NINDS NIH HHS R01 NS099333NINDS NIH HHS R01 NS104782
6 · The paper itself

Abstract

Circadian rhythms, present in most phyla across life, are biological oscillations occurring on a daily cycle. Since the discovery of their molecular foundations in model organisms, many inputs that modify this tightly controlled system in humans have been identified. Polygenic variations and environmental factors influence each person's circadian rhythm, contributing to the trait known as chronotype, which manifests as the degree of morning or evening preference in an individual. Despite normal variation in chronotype, much of society operates on a "one size fits all" schedule that can be difficult to adjust to, especially for certain individuals whose endogenous circadian phase is extremely advanced or delayed. This is a public health concern, as phase misalignment in humans is associated with a number of adverse health outcomes. Additionally, modern technology (such as electric lights and computer, tablet, and phone screens that emit blue light) and lifestyles (such as shift or irregular work schedules) are disrupting circadian consistency in an increasing number of people. Though medical and lifestyle interventions can alleviate some of these issues, growing research on endogenous circadian variability and sensitivity suggests that broader social changes may be necessary to minimize the impact of circadian misalignment on health.

Indexed as

Circadian RhythmHumansJet Lag SyndromeSleepSleep Disorders, Circadian RhythmWork Schedule Tolerance

Identifiers

PMID34396981
PMCPMC8363277
OpenAlexW3195660763

What OpenQuestion holds

Textmetadata
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.