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Author |
Hasler, B.P. |
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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 |
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2018 |
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American Journal of Epidemiology |
Abbreviated Journal |
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187 |
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3 |
Pages |
435-438 |
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Commentary; Human Health |
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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. |
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Title |
Obayashi et al. Respond to “Light at Night Predicts Depression—What Next?” |
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Journal Article |
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Year |
2018 |
Publication |
American Journal of Epidemiology |
Abbreviated Journal |
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187 |
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3 |
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439-440 |
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Keywords |
Commentary; Human Health |
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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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Obayashi, K.; Saeki, K.; Kurumatani, N. |
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Title |
Bedroom Light Exposure at Night and the Incidence of Depressive Symptoms: A Longitudinal Study of the HEIJO-KYO Cohort |
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Journal Article |
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Year |
2018 |
Publication |
American Journal of Epidemiology |
Abbreviated Journal |
Am J Epidemiol |
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187 |
Issue |
3 |
Pages |
427-434 |
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Keywords |
Human Health; Mental Health; indoor light; geriatrics; Sleep; Sleep Disorders |
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Previous studies have indicated that minimal exposure to light at night (LAN) increases depression risk, even at 5 lux, in nocturnal and diurnal mammals. Although such low-level LAN may affect human circadian physiology, the association between exposure to LAN and depressive symptoms remains uncertain. In the present study, bedroom light intensity was measured objectively, and depressive symptoms were assessed, during 2010-2014 in Nara, Japan. Of 863 participants (mean age = 71.5 years) who did not have depressive symptoms at baseline, 73 participants reported development of depressive symptoms during follow-up (median, 24 months). Compared with the “dark” group (average of <5 lux; n = 710), the LAN group (average of >/=5 lux; n = 153) exhibited a significantly higher depression risk (hazard ratio = 1.89; 95% CI: 1.13, 3.14), according to a Cox proportional hazards model adjusting for age, sex, body mass index, and economic status. Further, the significance remained in a multivariable model adjusting for hypertension, diabetes, and sleep parameters (hazard ratio = 1.72; 95% CI: 1.03, 2.89). Sensitivity analyses using bedroom light data with a cutoff value of >/=10 lux suggested consistent results. In conclusion, these results indicated that exposure to LAN in home settings was independently associated with subsequent depression risk in an elderly general population. |
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Department of Community Health and Epidemiology, Nara Medical University School of Medicine, 840 Shijocho, Kashiharashi, Nara 634-8521, Japan; e-mail: obayashi(at)naramed-u.ac.jp |
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Oxford Academic |
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English |
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English |
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0002-9262 |
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PMID:28992236 |
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IDA @ john @ |
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1815 |
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Author |
Miller, S.D.; Straka III, W.C.; Yue, J.; Seaman, C.J.; Xu, S.; Elvidge, C.D.; Hoffmann, L.; Azeem, I. |
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Title |
The Dark Side of Hurricane Matthew: Unique Perspectives from the VIIRS Day/Night Band |
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Journal Article |
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2018 |
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Bulletin of the American Meteorological Society |
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Bull. Amer. Meteor. Soc. |
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99 |
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12 |
Pages |
2561-2574 |
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remote sensing |
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Hurricane Matthew (28 Sep – 9 October 2016) was perhaps the most infamous storm of the 2016 Atlantic hurricane season, claiming over 600 lives and causing over $15 billion USD in damages across the central Caribbean and southeastern U.S. seaboard. Research surrounding Matthew and its many noteworthy meteorological characteristics (e.g., rapid intensification into the southernmost Category 5 hurricane in the Atlantic basin on record, strong lightning and sprite production, and unusual cloud morphology) is ongoing. Satellite remote sensing typically plays an important role in the forecasting and study of hurricanes, providing a top-down perspective on storms developing over the remote and inherently data sparse tropical oceans. In this regard, a relative newcomer among the suite of satellite observations useful for tropical cyclone monitoring and research is the Visible/Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band (DNB), a sensor flying onboard the NOAA/NASA Suomi National Polar-orbiting Partnership (SNPP) satellite. Unlike conventional instruments, the DNB's sensitivity to extremely low levels of visible/near-infrared light offers new insight on storm properties and impacts. Here, we chronicle Matthew’s path of destruction and peer through the DNB’s looking glass of low-light visible observations, including lightning connected to sprite formation, modulation of the atmospheric nightglow by storm-generated gravity waves, and widespread power outages. Collected without moonlight, these examples showcase the wealth of unique information present in DNB nocturnal low-light observations without moonlight, and their potential to complement traditional satellite measurements of tropical storms worldwide. |
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0003-0007 |
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GFZ @ kyba @ |
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1959 |
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Robertson, B.A.; Keddy-Hector, I.A.; Shrestha, S.D.; Silverberg, L.Y.; Woolner, C.E.; Hetterich, I.; Horváth, G. |
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Title |
Susceptibility to ecological traps is similar among closely related taxa but sensitive to spatial isolation |
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2018 |
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Animal Behaviour |
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135 |
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77-84 |
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aquatic insect; behaviour; evolutionary trap; light pollution; maladaptation; polarized light pollution |
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0003-3472 |
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LoNNe @ schroer @ |
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1793 |
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