Outdoor artificial light at night, obesity, and sleep health: Cross-sectional analysis in the KoGES study

Koo, Yong Seo; Song, June O.; Joo, Eun Yeon; Lee, Heon Jeong; Lee, Eunil; Lee, Sang Kun; Jung, Ki Young

doi:10.3109/07420528.2016.1143480

Cited by 121 publications

(100 citation statements)

References 69 publications

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“…However, the proper timing of exercise and its potential added benefit of improving circadian entrainment have not been investigated thoroughly. Disruption of circadian rhythms (e.g., by shift work, social jetlag, early-morning schedules) is associated with metabolic disorders, cardiovascular disease, and cancer (6)(7)(8)(9)(10)(11). If exercise could reduce circadian disruption, then it may also improve the risk factors associated with this disruption.…”

Section: Discussionmentioning

confidence: 99%

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Circadian rhythm phase shifts caused by timed exercise vary with chronotype

Thomas¹,

Kern²,

Bush³

et al. 2020

JCI Insight

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Section: Discussionmentioning

confidence: 99%

“…Numerous studies have shown that circadian disruption is a health risk. Shift work chronically disrupts the circadian system and is also associated with increased risk of cancer, obesity, and cardiovascular disease (6)(7)(8)(9)(10)(11). Nonshift workers also experience chronic forms of circadian disruption.…”

Section: Introductionmentioning

confidence: 99%

Circadian rhythm phase shifts caused by timed exercise vary with chronotype

Thomas¹,

Kern²,

Bush³

et al. 2020

JCI Insight

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“…Thus, exposure to bright artificial light in the evening before bedtime has been associated with a delay in circadian phase, as assessed by measures of subjective chronotype (Martin et al 2012; Vollmer et al 2012), subjective sleep timing (Koo et al 2016), salivary melatonin levels (Gordijn et al 1999; Benloucif et al 2008; Cajochen et al 2011) and core body temperature (Krauchi et al 1997). Furthermore, adolescents living in urban areas and exposed to bright artificial light at night have a later chronotype as assessed by the Munich ChronoType Questionnaire (MCTQ) and Morningness–Eveningness Questionnaire (MEQ), compared to those living in more rural settings (Vollmer et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Chronotype and environmental light exposure in a student population

Porcheret

Wald

Fritschi

et al. 2018

Chronobiology International

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In humans and most other species, changes in the intensity and duration of light provide a critical set of signals for the synchronisation of the circadian system to the astronomical day. The timing of activity within the 24 h day defines an individual’s chronotype, i.e. morning, intermediate or evening type. The aim of this study was to investigate the associations between environmental light exposure, due to geographical location, on the chronotype of university students. Over 6 000 university students from cities in the Northern Hemisphere (Oxford, Munich and Groningen) and Southern Hemisphere (Perth, Melbourne and Auckland) completed the Munich ChronoType Questionnaire. In parallel, light measures (daily irradiance, timing of sunrise and sunset) were compiled from satellite or ground stations at each of these locations. Our data shows that later mid-sleep point on free days (corrected for oversleep on weekends MFSsc) is associated with (i) residing further from the equator, (ii) a later sunset, (iii) spending more time outside and (iv) waking from sleep significantly after sunrise. However, surprisingly, MSFsc did not correlate with daily light intensity at the different geographical locations. Although these findings appear to contradict earlier studies suggesting that in the wider population increased light exposure is associated with an earlier chronotype, our findings are derived exclusively from a student population aged between 17 and 26 years. We therefore suggest that the age and occupation of our population increase the likelihood that these individuals will experience relatively little light exposure in the morning whilst encountering more light exposure later in the day, when light has a delaying effect upon the circadian system.

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“…The extent to which outdoor lighting impacts human health is yet to be reliably determined. While epidemiological studies have found correlations between the amount of outdoor lighting and some health effects (Kloog, Haim, Stevens, Barchana, & Portnov, 2008;Koo et al, 2016), as with ecological patterns, they are limited Sensitivities to white light were calculated from experimentally derived values in existing literature (B atnes et al, 2013;Crisp & Ritz, 1973;Forward, Cronin, & Stearns, 1984;Gorbunov & Falkowski, 2002;Svane & Dolmer, 1995;Tankersley, Mckelvey, & Forward, 1995;Young & Chia, 1982) DAVIES AND SMYTH | 877 by the inferences that can be drawn from satellite images (Defence Meteorological Satellite Programme Operational Line Scan) with insufficient spatial resolution (5 km) to differentiate exposure to ALAN from other factors that covary across city districts at fine spatial scales (Elvidge et al, 2007;Kyba, 2016). The need for higher resolution images or novel approaches that can disentangle the effects on both ecology and human health of multiple urban pollutants that covary is clear, although individual-level sensors can also reveal important impacts of daily light exposure on circadian disruption and stress (Figueiro et al, 2017).…”

Section: Impacts On Human Healthmentioning

confidence: 99%

Why artificial light at night should be a focus for global change research in the 21st century

Davies

Smyth

2017

Global Change Biology

263

183

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The environmental impacts of artificial light at night have been a rapidly growing field of global change science in recent years. Yet, light pollution has not achieved parity with other global change phenomena in the level of concern and interest it receives from the scientific community, government and nongovernmental organizations. This is despite the globally widespread, expanding and changing nature of night-time lighting and the immediacy, severity and phylogenetic breath of its impacts. In this opinion piece, we evidence 10 reasons why artificial light at night should be a focus for global change research in the 21st century. Our reasons extend beyond those concerned principally with the environment, to also include impacts on human health, culture and biodiversity conservation more generally. We conclude that the growing use of night-time lighting will continue to raise numerous ecological, human health and cultural issues, but that opportunities exist to mitigate its impacts by combining novel technologies with sound scientific evidence. The potential gains from appropriate management extend far beyond those for the environment, indeed it may play a key role in transitioning towards a more sustainable society.

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Outdoor artificial light at night, obesity, and sleep health: Cross-sectional analysis in the KoGES study

Cited by 121 publications

References 69 publications

Circadian rhythm phase shifts caused by timed exercise vary with chronotype

Circadian rhythm phase shifts caused by timed exercise vary with chronotype

Chronotype and environmental light exposure in a student population

Why artificial light at night should be a focus for global change research in the 21st century

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