Light as a circadian stimulus for architectural lighting

Lighting Research & Technology, Journal Year: 2016, Volume and Issue: 50(4), P. 497 - 510

Published: Dec. 6, 2016

Consideration is being given to the adoption of a new metric characterizing light as it affects human circadian system. Much has been learned over past couple decades about stimulus for system regulation, so appropriate that these discussions take place. The present paper develops an argument adopting quantifying in architectural spaces. (a) was developed from several lines biophysical research, including those basic retinal neurophysiology; (b) validated controlled experiments; and (c) used successfully number real-world applications. Any metrics should each foundational points into consideration.

Language: Английский

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Tailored lighting intervention improves measures of sleep, depression, and agitation in persons with Alzheimer’s disease and related dementia living in long-term care facilities

Clinical Interventions in Aging, Journal Year: 2014, Volume and Issue: unknown, P. 1527 - 1527

Published: Sept. 1, 2014

Background: Light therapy has shown great promise as a nonpharmacological method to improve symptoms associated with Alzheimer’s disease and related dementias (ADRD), preliminary studies demonstrating that appropriately timed light exposure can nighttime sleep efficiency, reduce nocturnal wandering, alleviate evening agitation. Since the human circadian system is maximally sensitive short-wavelength (blue) light, lower, more targeted lighting interventions for therapeutic purposes, be used. Methods: The present study investigated effectiveness of tailored intervention individuals ADRD living in nursing homes. Low-level “bluish-white” designed deliver high stimulation during daytime was installed 14 home resident rooms period 4 weeks. Light–dark rest–activity patterns were collected using Daysimeter. Sleep time efficiency measures obtained data. Measures quality, depression, agitation standardized questionnaires, at baseline, end 4-week intervention, weeks after removed. Results: significantly ( P <0.05) decreased global scores from Pittsburgh Quality Index, increased total efficiency. also phasor magnitude, measure 24-hour resonance between light–dark patterns, suggesting an increase entrainment. reduced depression Cornell Scale Depression Dementia Cohen–Mansfield Agitation Inventory. Conclusion: A stimulation, used quality behavior patients ADRD. field study, while promising application, should replicated larger sample size perhaps longer treatment duration. Keywords: disorders, therapy, rhythms,

Language: Английский

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Non-visual biological effect of lighting and the practical meaning for lighting for work

Applied Ergonomics, Journal Year: 2006, Volume and Issue: 37(4), P. 461 - 466

Published: June 14, 2006

Language: Английский

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Spectral quality of light modulates emotional brain responses in humans

Proceedings of the National Academy of Sciences, Journal Year: 2010, Volume and Issue: 107(45), P. 19549 - 19554

Published: Oct. 25, 2010

Light therapy can be an effective treatment for mood disorders, suggesting that light is able to affect state in the long term. As a first step understand this effect, we hypothesized might also acutely influence emotion and tested whether short exposures modulate emotional brain responses. During functional magnetic resonance imaging, 17 healthy volunteers listened neutral vocal stimuli while being exposed alternating 40-s periods of blue or green ambient light. Blue (relative green) increased responses voice area temporal cortex hippocampus. processing, connectivity between area, amygdala, hypothalamus was selectively enhanced context illumination, which shows stimulation amygdala are influenced by both decoding information spectral quality These results demonstrate acute its on processing identify unique network merging affective information.

Language: Английский

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The role of environmental light in sleep and health: Effects of ocular aging and cataract surgery

Sleep Medicine Reviews, Journal Year: 2010, Volume and Issue: 14(4), P. 269 - 280

Published: Jan. 8, 2010

Language: Английский

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Review: The Impact of Light in Buildings on Human Health

Indoor and Built Environment, Journal Year: 2010, Volume and Issue: 19(1), P. 8 - 20

Published: Feb. 1, 2010

The effects of light on health can be divided into three sections. first is that as radiation. Exposure to the ultraviolet, visible, and infrared radiation produced by sources damage both eye skin, through thermal photochemical mechanisms. Such rare for indoor lighting installations designed vision but occur in some situations. second operating visual system. Lighting enables us see conditions cause discomfort are likely lead eyestrain. Anyone who frequently experiences eyestrain not enjoying best health. buildings well known easily avoided. third circadian This influence sleep patterns believed linked development breast cancer among night shift workers. There still much learn about impact human what enough ensure topic requires attention all those concerned with buildings.

Language: Английский

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A framework for predicting the non-visual effects of daylight – Part I: photobiology- based model

Lighting Research & Technology, Journal Year: 2012, Volume and Issue: 44(1), P. 37 - 53

Published: Feb. 13, 2012

This paper investigates the formulation of a modelling framework for non-visual effects daylight, such as entrainment circadian system and maintenance alertness. The body empirical data from photobiology studies is now sufficient to start developing preliminary lighting evaluation methods design. Eventually, these have potential become relevant quantity consider when assessing overall daylighting performance space. describes assumptions general approach that were developed propose modeling occupant exposure light, presents novel means visualising ‘circadian potential’ point in proposed uses current outcomes research define – at this static threshold values illumination terms spectrum, intensity timing light human eye. These are then translated into goals simulation, based on vertical illuminance eye, ultimately could building A new climate-based simulation model has been apply concepts residential environment. will be described Part 2 paper.

Language: Английский

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Comparisons of three practical field devices used to measure personal light exposures and activity levels

Lighting Research & Technology, Journal Year: 2012, Volume and Issue: 45(4), P. 421 - 434

Published: June 22, 2012

This paper documents the spectral and spatial performance characteristics of two new versions Daysimeter, devices developed calibrated by Lighting Research Center to measure record personal circadian light exposure activity levels, compares them those Actiwatch Spectrum (Philips Healthcare). Photometric errors from Daysimeters were also determined for various types sources. The had better photometric than Spectrum. To assess differences associated with measuring levels at different locations on body, older adults wore four an five consecutive days. Wearing Daysimeter or wrist compromises accurate measurements relative locating a photosensor plane cornea.

Language: Английский

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Preliminary evidence that both blue and red light can induce alertness at night

BMC Neuroscience, Journal Year: 2009, Volume and Issue: 10(1)

Published: Aug. 27, 2009

A variety of studies have demonstrated that retinal light exposure can increase alertness at night. It is now well accepted the circadian system maximally sensitive to short-wavelength (blue) and quite insensitive long-wavelength (red) light. Retinal exposures blue night been recently shown impact alertness, implicating participation by system. The present experiment was conducted look both red two different levels on nocturnal alertness. Visually effective but moderate are ineffective for stimulating If it were a level impacts would had occur via pathway other than through Fourteen subjects participated in within-subject two-night study, where each participant exposed four experimental lighting conditions. Each subject presented high (40 lx cornea) low (10 diffuse condition same spectrum (blue, λmax = 470 nm, or red, 630 nm). presentation order counterbalanced across sessions given subject; spectra within sessions. Prior condition, remained dark (< 1 60 minutes. Electroencephalogram (EEG) measurements, electrocardiogram (ECG), psychomotor vigilance tests (PVT), self-reports sleepiness, saliva samples melatonin assays collected end periods. Exposures resulted increased beta reduced alpha power relative preceding high, not low, significantly heart rate condition. Performance sleepiness ratings strongly affected Only higher reduction These results support previous findings may be mediated system, does seem only light-sensitive affect

Language: Английский

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Non-image forming effects of illuminance and correlated color temperature of office light on alertness, mood, and performance across cognitive domains

Building and Environment, Journal Year: 2018, Volume and Issue: 149, P. 253 - 263

Published: Dec. 4, 2018

Language: Английский

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