Recommendations for daytime, evening, and nighttime indoor light exposure to best support physiology, sleep, and wakefulness in healthy adults

PLoS Biology, Journal Year: 2022, Volume and Issue: 20(3), P. e3001571 - e3001571

Published: March 17, 2022

Ocular light exposure has important influences on human health and well-being through modulation of circadian rhythms sleep, as well neuroendocrine cognitive functions. Prevailing patterns do not optimally engage these actions for many individuals, but advances in our understanding the underpinning mechanisms emerging lighting technologies now present opportunities to adjust promote optimal physical mental performance. A newly developed, international standard provides a SI-compliant way quantifying influence intrinsically photosensitive, melanopsin-expressing, retinal neurons that mediate effects. The report recommendations lighting, based an expert scientific consensus expressed easily measured quantity (melanopic equivalent daylight illuminance (melaponic EDI)) defined within this standard. are supported by detailed analysis sensitivity circadian, neuroendocrine, alerting responses ocular provide straightforward framework inform design practice.

Language: Английский

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Disturbance of the Circadian System in Shift Work and Its Health Impact

Journal of Biological Rhythms, Journal Year: 2021, Volume and Issue: 37(1), P. 3 - 28

Published: Dec. 30, 2021

The various non-standard schedules required of shift workers force abrupt changes in the timing sleep and light-dark exposure. These result disturbances endogenous circadian system its misalignment with environment. Simulated night-shift experiments field-based studies both indicate that is resistant to adaptation from a day- night-oriented schedule, as determined by lack substantial phase shifts over multiple days centrally controlled rhythms, such those melatonin cortisol. There evidence disruption caused work results not only between external cycle, but also state internal desynchronization levels system. This case rhythms central pacemaker clock genes expression tissues peripheral blood mononuclear cells, hair follicle oral mucosa cells. disruptive effects atypical extend beyond profile canonical affects other transcripts human genome. In general, after several living at night, most rhythmic genome remain adjusted day-oriented dampened group amplitudes. contrast transcripts, metabolomics revealed metabolites hours when working nights, thus leading their Altogether, these sleep-wake emphasize all-encompassing impact work, can contribute increased risk medical conditions. Here, we review latest scientific regarding on system, alertness shift-working populations, discuss potential clinical impacts.

Language: Английский

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Human-Centric Lighting: Foundational Considerations and a Five-Step Design Process

Frontiers in Neurology, Journal Year: 2021, Volume and Issue: 12

Published: Jan. 27, 2021

At its best, human-centric lighting considers the visual and non-visual effects of light in support positive human outcomes. worst, it is a marketing phrase used to healthwash products or design solutions. There no doubt that environmental contributes health, but how might one practice given both credible potential implausible hype? Marketing literature filled with promises. Technical societies have summarized science not yet offered guidance. Meanwhile, designers are middle, attempting distinguish knowledge from which dubious make decisions affect people directly. This article intended to: (1) empower reader fundamental understandings ways affects health; (2) provide process for can dovetail decision-making already part designer's workflow.

Language: Английский

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Environmental Impacts of Artificial Light at Night

Annual Review of Environment and Resources, Journal Year: 2022, Volume and Issue: 47(1), P. 373 - 398

Published: June 15, 2022

The nighttime is undergoing unprecedented change across much of the world, with natural light cycles altered by introduction artificial emissions. Here we review extent and dynamics at night (ALAN), benefits that ALAN provides, environmental costs creates, approaches to mitigating these negative effects, how are likely in future. We particularly highlight consequences increasingly widespread use light-emitting diode (LED) technology for new lighting installations retrofit pre-existing ones. Although this has been characterized as a technological revolution, it also constitutes revolution impacts ALAN, because LEDs commonly used outdoor have significant emissions blue wavelengths which many biological responses sensitive. It clear very different approach required.

Language: Английский

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Occupants’ responses to window views, daylighting and lighting in buildings: A critical review

Building and Environment, Journal Year: 2022, Volume and Issue: 219, P. 109172 - 109172

Published: May 11, 2022

This paper presents a critical review of studies addressing the effects window views, daylighting, and lighting on occupant behavior, perception, performance, well-being. A systematic search in Scopus database was performed November 2021 yielded 515 hits. Seventy-six were selected according to following criteria: i) papers presenting research results with participants' responses ii) accounting for lighting, or view assessments. The study setting features, participants, predictors outcomes, statistical approach, reported significance level, limitations extracted from each paper. analysis then identified differences effect predictor outcome. number records obtained through structured 240. wide range have been used indoor assess people's responses. most commonly artificial features -qualitative - followed by some properties light sources, such as correlated color temperature, spectral distribution horizontal illuminance. Differences methods data collection, predictors, ways measure outcomes generated inconclusive that limited specific study. We suggest simple model prediction performance illuminance temperature. points few scattered model, therefore, suffers considerable uncertainties. Yet, it quantifies ranges are comparable similar models other environment domains.

Language: Английский

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Causes, Consequences, and Treatments of Sleep and Circadian Disruption in the ICU: An Official American Thoracic Society Research Statement

American Journal of Respiratory and Critical Care Medicine, Journal Year: 2023, Volume and Issue: 207(7), P. e49 - e68

Published: March 31, 2023

Section:ChooseTop of pageAbstract <

Language: Английский

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Associations between light exposure and sleep timing and sleepiness while awake in a sample of UK adults in everyday life

Proceedings of the National Academy of Sciences, Journal Year: 2023, Volume and Issue: 120(42)

Published: Oct. 9, 2023

Experimental and interventional studies show that light can regulate sleep timing sleepiness while awake by setting the phase of circadian rhythms supporting alertness. The extent to which differences in exposure explain variations within between individuals everyday life remains less clear. Here, we establish a method address this deficit, incorporating an open-source wearable wrist-worn logger (SpectraWear) smartphone-based online data collection. We use it simultaneously record longitudinal (in melanopic equivalent daylight illuminance), timing, subjective alertness over seven days convenience sample 59 UK adults without externally imposed challenge (e.g., shift work or jetlag). Participants reliably had strong daily but frequently were exposed during daytime more pre-bedtime episodes than recommended [T. M. Brown et al. , PLoS Biol. 20 e3001571 (2022)]. Prior several hours was associated with lower with, particular, brighter late episode after wake linked reduced early morning (sleep inertia). Higher longer onset latency. Early correlated reproducible robust patterns higher daytime/lower night-time exposure. Our study establishes for collecting health/performance provides evidence associations important determinants health performance.

Language: Английский

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Light as a Modulator of Non-Image-Forming Brain Functions—Positive and Negative Impacts of Increasing Light Availability

Clocks & Sleep, Journal Year: 2023, Volume and Issue: 5(1), P. 116 - 140

Published: March 17, 2023

Light use is rising steeply, mainly because of the advent light-emitting diode (LED) devices. LEDs are frequently blue-enriched light sources and may have different impacts on non-image forming (NIF) system, which maximally sensitive to blue-wavelength light. Most importantly, timing LED device widespread, leading novel exposure patterns NIF system. The goal this narrative review discuss multiple aspects that we think should be accounted for when attempting predict how situation will affect impact brain functions. We first cover both image-forming pathways brain. then detail our current understanding human cognition, sleep, alertness, mood. Finally, questions concerning adoption lighting screens, offer new opportunities improve well-being, but also raise concerns about increasing exposure, detrimental health, particularly in evening.

Language: Английский

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ENLIGHT: A consensus checklist for reporting laboratory-based studies on the non-visual effects of light in humans

EBioMedicine, Journal Year: 2023, Volume and Issue: 98, P. 104889 - 104889

Published: Dec. 1, 2023

BackgroundThere is no consensus on reporting light characteristics in studies investigating non-visual responses to light. This project aimed develop a checklist for laboratory-based investigations the impact of physiology.MethodsA four-step modified Delphi process (three questionnaire-based feedback rounds and one face-to-face group discussion) involving international experts was conducted reach items be included checklist. Following process, resulting tested pilot phase with independent experts.FindingsAn initial list 61 related light-based interventions condensed final containing 25 items, based upon among (final n = 60). Nine were deemed necessary report regardless research question or context. A description each item provided accompanying Explanation Elaboration (E&E) document. The testing led minor textual clarifications E&E document.InterpretationThe ENLIGHT Checklist first consensus-based documenting ocular human studies. implementation will enhance by ensuring comprehensive documentation, enhancing reproducibility, enabling data aggregation across studies.FundingNetwork European Institutes Advanced Study (NETIAS) Constructive Thinking (CAT) programme; Sir Henry Wellcome Postdoctoral Fellowship (Wellcome Trust, 204686/Z/16/Z); Netherlands Organisation Health Research Development VENI fellowship (2020–09150161910128); U.S. Department Defense Grant (W81XWH-16-1-0223); National University Singapore (NUHSRO/2022/038/Startup/08); Foundation (NRF2022-THE004-0002).

Language: Английский

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Light-environment interactions and integrative lighting design: Connecting visual, non-visual and energy requirements in a case study experiment

Building and Environment, Journal Year: 2024, Volume and Issue: 253, P. 111323 - 111323

Published: Feb. 23, 2024

Beyond vision, light influences human circadian rhythms and buildings' energy consumption. Design solutions are needed to satisfy visual requirements while minimizing lighting demands. By reflecting the incident radiation, inner surfaces influence spatial spectral distribution, affecting achieve task illuminance light-induced response. Here, walls' characteristics' impact on overall luminous environment power demands is analysed in a test room, combining seven colours three sources' correlated colour temperatures (CCTs). Hence, luminaires set meet needs: eye level irradiances measured, responses obtained regarding both stimulus (CS) melanopic equivalent daylight (mel-EDI). It found that parameters higher for highly reflective walls or those most short-wavelength interval, being insufficient proper stimulation according current guidelines. For all colours, highest mel-EDIs occur with 6000 K CCT lowest 3000 CCT. On contrary, CSs generally lower 4000 K. Second, necessary calculated. With warm sources, sufficient CS mel-EDI values achieved similar eye-level illuminance, requiring outputs regardless of wall's colour. In other cases, corresponding = 136 lx much than reach 30%, 250 quite always highest.

Language: Английский

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