Effects of light on human circadian rhythms, sleep and mood

Somnologie - Schlafforschung und Schlafmedizin, Journal Year: 2019, Volume and Issue: 23(3), P. 147 - 156

Published: Aug. 20, 2019

Humans live in a 24-hour environment, which light and darkness follow diurnal pattern. Our circadian pacemaker, the suprachiasmatic nuclei (SCN) hypothalamus, is entrained to solar day via pathway from retina synchronises our internal biological rhythms. Rhythmic variations ambient illumination impact behaviours such as rest during sleep activity wakefulness well their underlying processes. Rather recently, availability of artificial has substantially changed especially evening night hours. This may increase risk developing rhythm sleep-wake disorders (CRSWD), are often caused by misalignment endogenous rhythms external light-dark cycles. While exact relationship between CRSWD remains be established, nocturnal been shown alter humans. On other hand, can also used an effective noninvasive therapeutic option with little no side effects, improve sleep,mood general well-being. article reviews current state knowledge regarding effects on rhythms, sleep, mood.

Language: Английский

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A Review of Human Physiological Responses to Light: Implications for the Development of Integrative Lighting Solutions

LEUKOS The Journal of the Illuminating Engineering Society of North America, Journal Year: 2021, Volume and Issue: 18(3), P. 387 - 414

Published: March 26, 2021

Architectural lighting has potent biological effects but applied practices that capitalize on this potential have been limited. In review, we endeavor to consolidate and synthesize key references will be useful for professionals, with the goal of supporting knowledge translation into pragmatic strategies. Specifically, explain relevant terminology, outline basic concepts, identify references, provide a balanced overview current state knowledge, highlight important remaining questions. We summarize physiological light human health well-being, including description processes underlying photic regulation circadian, neuroendocrine, neurobehavioral functions. review seminal work elucidating elements mediating potency these responses, specific attention factors critical interpreting those findings. parallel, endorse melanopic Equivalent Daylight Illuminance (Ev,melD65) as preferred measure quantify light. Ultimately, while future studies are necessary further facilitate laboratory domestic workplace settings, immediate better support is clear. Aiming integrative solutions biologically high during day low night perhaps most improvement made in order applications humans.

Language: Английский

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The Role of Daylight for Humans: Gaps in Current Knowledge

Clocks & Sleep, Journal Year: 2020, Volume and Issue: 2(1), P. 61 - 85

Published: Feb. 28, 2020

Daylight stems solely from direct, scattered and reflected sunlight, undergoes dynamic changes in irradiance spectral power composition due to latitude, time of day, year the nature physical environment (reflections, buildings vegetation). Humans their ancestors evolved under these natural day/night cycles over millions years. Electric light, a relatively recent invention, interacts competes with light–dark cycle impact human biology. What are consequences living industrialised urban areas much less daylight more use electric throughout day (and at night), on general health quality life? In this workshop report, we have classified key gaps knowledge research into three main groups: (I) uncertainty as quantity needed for “optimal” physiological psychological functioning, (II) lack consensus practical measurement assessment methods tools monitoring real (day) light exposure across multiple scales, (III) insufficient integration exchange bases different disciplines. Crucial short long-term objectives fill proposed.

Language: Английский

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Human-centric lighting: Myth, magic or metaphor?

Lighting Research & Technology, Journal Year: 2020, Volume and Issue: 53(2), P. 97 - 118

Published: Oct. 6, 2020

This paper discusses the rise of human-centric lighting and its current status in lighting. We summarise human benefits associated with light show that has sound motivations, despite being tainted by misleading marketing claims. The phrase integrative avoids hype encapsulates what aspires to be. Embodied these concepts are some things old new. is twofold. First, without diminishing value products, core ingredient for good outcomes design, driven a design team. Second, still vision, visibility, visual comfort amenity as important ever. Complementing new awareness responsibility how influence non-visual responses humans. Circadian, neuroendocrine neurobehavioural health should be considered on-par responses. leads toward solutions increased contrast between day night. parties responsible addressing evolving. Architects, professionals, equipment manufacturers, medical building owners individuals all have stake, but who drive decisions proportion?

Language: Английский

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Light Modulation of Human Clocks, Wake, and Sleep

Clocks & Sleep, Journal Year: 2019, Volume and Issue: 1(1), P. 193 - 208

Published: March 13, 2019

Light, through its non-imaging forming effects, plays a dominant role on myriad of physiological functions, including the human sleep-wake cycle. The non-image effects light heavily rely specific properties such as intensity, duration, timing, pattern, and wavelengths. Here, we address how influence sleep wakefulness in humans acute e.g., alertness, and/or circadian timing system. Of critical relevance, discuss different characteristics exposure across 24-h day can lead to changes propensity, architecture, wake electroencephalogram (EEG) power spectra. Ultimately, knowledge affects improve settings at home workplace health well-being optimize treatments chronobiological disorders.

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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The Impact of Optimized Daylight and Views on the Sleep Duration and Cognitive Performance of Office Workers

International Journal of Environmental Research and Public Health, Journal Year: 2020, Volume and Issue: 17(9), P. 3219 - 3219

Published: May 6, 2020

A growing awareness has recently emerged on the health benefits of exposure to daylight and views. Daylight is linked circadian rhythm regulation, which can have significant impacts sleep quality cognitive function. Views nature also been shown impact emotional affect performance. This study explores optimized views performance office workers. Thirty knowledge workers spent one week working in each two environments with identical layouts, furnishings, orientations; however, was outfitted electrochromic glass other traditional blinds, producing lighting conditions 40.6 316 equivalent melanopic lux, respectively. Participants condition slept 37 min longer as measured by wrist-worn actigraphs scored 42% higher simulations designed test their order decision-making Both function were impacted after day space, yet became more over course week. The positive effect comparable for almost all participants, while increases duration significantly greater those lowest baseline duration. stresses significance designing optimize

Language: Английский

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Metabolic Implications of Exposure to Light at Night: Lessons from Animal and Human Studies

Obesity, Journal Year: 2020, Volume and Issue: 28(S1)

Published: July 1, 2020

Lately, the incidence of overweight, obesity, and type 2 diabetes has shown a staggering increase. To prevent treat these conditions, one must look at their etiology. As life on earth evolved under conditions nature’s 24‐hour light/dark cycle, it seems likely that exposure to artificial light night (LAN) would affect physiology. Indeed, ample evidence LAN impacts many metabolic parameters, least partly via biological clock in suprachiasmatic nucleus hypothalamus. This review focuses impact chronic acute effects different wavelengths locomotor activity, food intake, sleep/wake body temperature, melatonin, glucocorticoids, glucose lipid metabolism. While disturbs daily rhythms experiments using short‐term also have negative metabolically active peripheral tissues. Experiments not only indicated an important role for melanopsin, photopigment found intrinsically photosensitive retinal ganglion cells, but provided each wavelength may specific energy Importantly, been homeostasis humans be associated with increased atherosclerosis.

Language: Английский

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The Light-Dosimeter: A new device to help advance research on the non-visual responses to light

Lighting Research & Technology, Journal Year: 2023, Volume and Issue: 55(4-5), P. 474 - 486

Published: Feb. 13, 2023

This article describes the development of a device to investigate non-visual responses light: The Light-Dosimeter (lido). Its multidisciplinary team followed user-centred approach throughout project, that is, their design decisions focused on researchers' and participants' needs. Together with custom-made mountings software Lido Studio, lidos provide researchers holistic solution record light exposure in near-corneal plane laboratory settings under real-world conditions. Validation measurements commercial equipment were deemed satisfying, as was combining data from other devices. handling use Studio during trial period by various participants successful. Despite some limitations, can help advance research over coming years.

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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