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| Author |
Hasler, B.P. |
| Title |
Commentary on Bedroom Light Exposure at Night and the Incidence of Depressive Symptoms: A Longitudinal Study of the HEIJOKYO Cohort (Obayashi et al) |
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Journal Article |
| Year |
2018 |
Publication |
American Journal of Epidemiology |
Abbreviated Journal |
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| Volume |
187 |
Issue |
3 |
Pages |
435-438 |
Keywords  |
Commentary; Human Health |
| Abstract |
In modern society, we are increasingly disconnected from natural light/dark cycles and beset by round-the-clock exposure to artificial light. Light has powerful effects on physical and mental health, in part via the circadian system, and thus the timing of light exposure dictates whether it is helpful or harmful. In their compelling paper, Obayashi and colleagues offer evidence that light at night can prospectively predict an elevated incidence of depressive symptoms in older adults. Strengths of the study include the longitudinal design and direct, objective assessment of light levels, as well as accounting for multiple plausible confounders during analyses. Follow-up studies should address the study's limitations, including reliance on a global self-report of sleep quality and a two-night assessment of light exposure that may not reliably represent typical light exposure. In addition, experimental studies including physiological circadian measures will be necessary to determine if the light effects on depression are mediated through the circadian system or are so-called “direct†effects of light. In any case, these exciting findings could inform novel new approaches to preventing depressive disorders in older adults. |
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0002-9262 |
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LoNNe @ kyba @ |
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1716 |
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| Author |
Obayashi, K.; Saeki, K.; Kurumatani, N. |
| Title |
Obayashi et al. Respond to “Light at Night Predicts Depression—What Next?” |
Type |
Journal Article |
| Year |
2018 |
Publication |
American Journal of Epidemiology |
Abbreviated Journal |
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| Volume |
187 |
Issue |
3 |
Pages |
439-440 |
| Keywords |
Commentary; Human Health |
| Abstract |
Our research includes some strengths and limitations. The most important strength is objective measurement of light at night (LAN) intensity using a bedside light meter. Most previous studies evaluating the association between LAN and health outcomes have assessed indoor LAN levels using a self-reported questionnaire or outdoor LAN levels using satellite data; however, self-reported indoor LAN levels has not yet been validated with objective measurement and outdoor LAN levels are surrogates for an individual LAN exposure. The second strength of our study includes its longitudinal design using multivariable methods to adjust for confounders, which indicated LAN exposure may be a cause of the incidence of depressive symptoms. Indeed, the depressive score evaluated by questionnaires may be above or below the cut-off value over the short term; therefore, a long-term study considering such unstable outcomes should be conducted. In the current study, LAN exposure was measured for only two nights; thus, an amplitude of LAN intensity has been focused. However, multiple measurements over time in the future study would allow an analysis of fluctuations in LAN exposure, which might be important for circadian physiology. |
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0002-9262 |
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LoNNe @ kyba @ |
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1717 |
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| Author |
Park, C.Y. |
| Title |
Night Light Pollution and Ocular Fatigue |
Type |
Journal Article |
| Year |
2018 |
Publication |
Journal of Korean Medical Science |
Abbreviated Journal |
J Korean Med Sci |
| Volume |
33 |
Issue |
38 |
Pages |
e257 |
| Keywords |
Commentary; Human Health |
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Department of Ophthalmology, Dongguk University, Ilsan Hospital, Goyang, Korea |
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1011-8934 |
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PMID:30220898; PMCID:PMC6137033 |
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GFZ @ kyba @ |
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2011 |
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| Author |
Yates, J. |
| Title |
Perspective: The Long-Term Effects of Light Exposure on Establishment of Newborn Circadian Rhythm |
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Journal Article |
| Year |
2018 |
Publication |
Journal of Clinical Sleep Medicine |
Abbreviated Journal |
Jcsm |
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14 |
Issue |
10 |
Pages |
1829-1830 |
| Keywords |
Commentary; Human Health |
| Abstract |
Development of newborns continues postnatally. Evidence has accumulated on the early life programming effects of light exposure on the maturing visual axis and the developing circadian rhythm. Consideration of the effects of light at night and insufficient light during the day should occur when giving anticipatory guidance in the care of newborn infants. Long-term health consequences of light imprinting may occur with inappropriate light-dark environments during the newborn period. |
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1550-9389 |
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GFZ @ kyba @ |
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2032 |
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| Author |
Stevens, R.G. |
| Title |
Comment on 'Domestic light at night and breast cancer risk: a prospective analysis of 105 000 UK women in the Generations Study' |
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Journal Article |
| Year |
2018 |
Publication |
British Journal of Cancer |
Abbreviated Journal |
Br J Cancer |
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in press |
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Commentary; Human Health |
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University of Connecticut, School of Medicine, 263 Farmington Avenue, Farmington, CT, 06032, USA. bugs@uchc.edu |
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0007-0920 |
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PMID:30283145 |
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no |
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GFZ @ kyba @ |
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2035 |
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