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Cited by 117Circadian rhythm and melatoninImpact of Light on Environment and HealthSleep and related disorders

The DOI matches its Crossref record; 35 of the 36 references it cites were found in a registry or an index.

Exposure to light at night and risk of depression in the elderly.

Obayashi, Kenji, Saeki, Keigo, Iwamoto, Junko, Ikada, Yoshito, Kurumatani, Norio·2013·Journal of Affective Disorders
DOI 10.1016/j.jad.2013.06.018
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Abstract

Background Recent advances in understanding the fundamental links between chronobiology and depressive disorders have enabled exploring novel risk factors for depression in the field of biological rhythms. Increased exposure to light at night (LAN) is common in modern life, and LAN exposure is associated with circadian misalignment. However, whether LAN exposure in home settings is associated with depression remains unclear. Methods We measured the intensities of nighttime bedroom light and ambulatory daytime light along with overnight urinary melatonin excretion (UME) in 516 elderly individuals (mean age, 72.8). Depressive symptoms were assessed using the Geriatric Depression Scale. Results The median nighttime light intensity was 0.8lx (interquartile range, 0.2-3.3). The depressed group (n=101) revealed significantly higher prevalence of LAN exposure (average intensity, ≥ 5 lx) compared with that of the nondepressed group (n=415) using a multivariate logistic regression model adjusted for daytime light exposure, insomnia, hypertension, sleep duration, and physical activity [adjusted odds ratio (OR): 1.89; 95% confidence interval (CI), 1.10-3.25; P=0.02]. Consistently, another parameter of LAN exposure (duration of intensity ≥ 10 lx, ≥ 30 min) was significantly more prevalent in the depressed than in the nondepressed group (adjusted OR: 1.71; 95% CI, 1.01-2.89; P=0.046). In contrast, UME was not significantly associated with depressive symptoms. Limitation Cross-sectional analysis. Conclusion These results suggested that LAN exposure in home settings is significantly associated with depressive symptoms in the general elderly population. The risk of depression may be reduced by keeping nighttime bedroom dark.

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Metadata

Authors
Obayashi, K., Saeki, K., Iwamoto, J., Ikada, Y., & Kurumatani, N.
Affiliations
  • Nara Medical University (JP)
  • Tenri Health Care University (JP)
Corresponding author
Obayashi, Kenji
ORCID
Venue
Journal of Affective Disorders
Publisher
Elsevier BV
Published
2013-10
Volume
151
Issue
1
Pages
331-336
ISSN
0165-0327 (ISSN-L)
DOI
10.1016/j.jad.2013.06.018
OpenAlex
W2011293479
Cited by
117
References
36
Citations by year
2026: 11 · 2025: 18 · 2024: 13 · 2023: 11 · 2022: 12 · 2021: 9 · 2020: 8 · 2019: 4 · 2018: 7 · 2017: 9 · 2016: 5 · 2015: 9 · 2014: 1
FWCI
2.70
Type
journal article
Language
en
Open access
closed
Licence
Locations
  • Journal of Affective Disorders (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Japan Diabetes Foundation
  • Japan Science and Technology Agency
  • Meiji Yasuda Life Foundation of Health and Welfare
  • Mitsui Sumitomo Insurance Welfare Foundation
  • Ministry of Education, Culture, Sports, Science and Technology
  • Osaka Gas Group Welfare Foundation
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Physical Sciences › Environmental Science › Global and Planetary Change › Impact of Light on Environment and Health
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
Keywords
light at night, depression, older adults, circadian misalignment, urinary melatonin, depressive symptoms, chronobiology, biological rhythms, insomnia, sleep duration
MeSH terms
Aged, Circadian Rhythm, Cross-Sectional Studies, Depression, Female, Humans, Light, Male, Melatonin, Psychiatric Status Rating Scales, Risk Factors

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