Blue-enriched office light competes with natural light as a zeitgeber

Vetter, Céline; Juda, Myriam; Lang, Dieter; Wojtysiak, Andreas; Roenneberg, Till

doi:10.5271/sjweh.3144

Cited by 65 publications

(54 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Blue-enriched polychromatic light has now been tested in a number of settings [27][28][29][30], but caution should be applied to the findings, as in some cases, such as the study of older people reported here, the effects appear small and mixed. Based on this work it is important to further characterise the risks and benefits of 17000 K blue-enriched light prior to this lighting being applied permanently in care homes for older people.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Blue-Enriched Lighting for Older People Living in Care Homes: Effect on Activity, Actigraphic Sleep, Mood and Alertness

Hopkins

Morgan

Schlangen

et al. 2017

CAR

View full text Add to dashboard Cite

Environmental (little outdoor light; low indoor lighting) and age-related physiological factors (reduced light transmission through the ocular lens, reduced mobility) contribute to a light-deprived environment for older people living in care homes. This study investigates the effect of increasing indoor light levels with blueenriched white lighting on objective (rest-activity rhythms, performance) and self-reported (mood, sleep, alertness) measures in older people. Eighty residents (69 female), aged 86 ± 8 yrs (mean ± SD), participated (MMSE 19 ± 6). Overhead fluorescent lighting was installed in communal rooms (n=20) of seven care homes.Four weeks of blue-enriched white lighting (17000 K  900 lux) were compared with four weeks of control white lighting (4000 K  200 lux), separated by three weeks wash-out. Participants completed validated mood and sleep questionnaires, psychomotor vigilance task (PVT) and wore activity and light monitors (AWL). Restactivity rhythms were assessed by cosinor, non-parametric circadian rhythm (NPCRA) and actigraphic sleep analysis. Blue-enriched (17000 K) light increased wake time and activity during sleep decreasing actual sleep time, sleep percentage and sleep efficiency (p < 0.05) (actigraphic sleep). Compared to 4000 K lighting, blueenriched 17000 K lighting significantly (p < 0.05) advanced the timing of participants' rest-activity rhythm (cosinor), increased daytime and night-time activity (NPCRA), reduced subjective anxiety (HADA) and sleep quality (PSQI). There was no difference between the two light conditions in daytime alertness and performance (PVT). Blue-enriched lighting produced some positive (increased daytime activity, reduced anxiety) and negative (increased night-time activity, reduced sleep efficiency and quality) effects in older people.Keywords: care home, light therapy; mood; elderly; rest-activity; sleep. 3 Graphical AbstractThe effect of blue-enriched 17000 K lighting (right) on the rest-activity, sleep and mood of older people living in care homes has been investigated compared to control 4000 K lighting (middle) (left, original lighting) 4

show abstract

Section: Discussionmentioning

confidence: 99%

“…This blue-light sensitivity has led to the recent development and testing of both blue light and blue-enriched polychromatic light in a variety of populations [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Blue-Enriched Lighting for Older People Living in Care Homes: Effect on Activity, Actigraphic Sleep, Mood and Alertness

Hopkins

Morgan

Schlangen

et al. 2017

CAR

View full text Add to dashboard Cite

show abstract

“…An X indicates that the health outcome was investigated, it does not give any indication on the strength or significance of the correlation between that health indicator and the office light conditions References Borisuit et al 33 Münch et al 34 Viola et al 35 Linhart et al 36 Mills et al 37 Figueiro et al 38 Das 39 Kozaki et al 40 Vetter et al 41 Maleetipwan-Mattsson et al 42 Geerdinck et al 43 Viitanen et al 44 Veitch et al 15 Villa et al 45 Hedge et al 46 Jafari et al 47 Hirning et al 48 Hirnign et al 49 Xia et al…”

Section: Resultsmentioning

confidence: 99%

“…This implies a possible correlation between daylight and human biological clock; however, in this study the light measurements are not analysed in combination with the questionnaire responses. Vetter et al 41 investigated the sleep-wake rhythm as part of the biological clock as well. They found that the MSW (Mid-Sleep on Workdays) did not change in either the control (4000 K) or the intervention group (8000 K).…”

Section: Sleep Qualitymentioning

confidence: 99%

“…Veitch et al 15 included visual capability (number of correct responses per second) and motivation (based on willingness to complete a computer task) as objective measures. Vetter et al 41 included activity levels measured with a wrist-worn actimetry device as outcome measures in their controlled intervention. In their crossover design, Münch et al 34 collected saliva samples every 30 minutes for hormonal analyses.…”

Section: Objective Health Measuresmentioning

confidence: 99%

See 1 more Smart Citation

Systematic review on the interaction between office light conditions and occupational health: Elucidating gaps and methodological issues

Duijnhoven

Aarts

Aries

et al. 2017

Indoor and Built Environment

View full text Add to dashboard Cite

Purpose The International Commission on Illumination (CIE) recommends researchers to investigate a wide variety of behavioural and health outcomes. However, researchers often investigate only a part of occupational health (OH) in relation to light. A literature study (2002–2017) regarding the relationship between office lighting conditions and OH was performed to identify gaps and methodological issues. Method The OH outcomes investigated in this paper were grouped according to the International Classification of Diseases and analysed per category: physical and physiological health, mental health, eye health, sleep parameters and visual comfort. Results Findings from the literature study (20 eligible papers) showed that all OH aspects were mostly but not exclusively measured subjectively. Furthermore, most studies investigated only a fraction of office lighting parameters and OH aspects. Conclusions It seems that Correlated Colour Temperature (CCT) and illuminance mainly correlate with OH. However, this may also be explained by gaps and methodological issues in studies described in eligible papers. Based on the literature study, an overview was composed elucidating gaps and methodological issues of office lighting and OH studies. It can be used to design and target the purpose of light and health research.

show abstract

Asking the Clock: How to Use Information from Questionnaires for Circadian Phenotyping

Vetter

Winnebeck

Roenneberg

2020

Methods in Molecular Biology

View full text Add to dashboard Cite

Blue-enriched office light competes with natural light as a zeitgeber

Cited by 65 publications

References 48 publications

Blue-Enriched Lighting for Older People Living in Care Homes: Effect on Activity, Actigraphic Sleep, Mood and Alertness

Blue-Enriched Lighting for Older People Living in Care Homes: Effect on Activity, Actigraphic Sleep, Mood and Alertness

Systematic review on the interaction between office light conditions and occupational health: Elucidating gaps and methodological issues

Asking the Clock: How to Use Information from Questionnaires for Circadian Phenotyping

Contact Info

Product

Resources

About