A5061878193- Impact of Light on Environment and Health
- Circadian rhythm and melatonin
- Building Energy and Comfort Optimization
- Nuclear reactor physics and engineering
- Color perception and design
- Education, Healthcare and Sociology Research
- Graphite, nuclear technology, radiation studies
- Air Quality and Health Impacts
- Social and Educational Sciences
- Nuclear Materials and Properties
- Sleep and Work-Related Fatigue
- Psychiatric care and mental health services
- Wireless Sensor Networks for Data Analysis
- Educational Environments and Student Outcomes
- Color Science and Applications
- Technology Use by Older Adults
- Health, psychology, and well-being
- Light effects on plants
- Greenhouse Technology and Climate Control
- Optics and Image Analysis
- Southeast Asian Sociopolitical Studies
- Life Cycle Costing Analysis
- Neuroscience, Education and Cognitive Function
- Conservation Techniques and Studies
- transportation and logistics systems
Aalborg University
2013-2021
Building Research Institute
2013-2018
University of Copenhagen
2009-2010
To assess light exposure during days with indoor, outdoor, and night work off work.Light intensity was continuously recorded for 7 across the year among indoor (n = 170), outdoor 151), workers 188) in Denmark (55-56°N) equipped a personal recorder. White intensity, duration above 80, 1000, 2500 lux, proportion of red, green, blue depicted by time day season work.Indoor workers' average only intermittently exceeded 1000 lux daytime working hours summer never winter. During hours, most Night...
To examine the effect of designed dynamic light on staff's quality sleep with regard to efficiency, level melatonin in saliva, and subjective perceptions sleep. An intervention group working was compared a control ordinary institutional at two comparable intensive care units (ICUs). The study included examining (1) profiles obtained from saliva samples, (2) terms number awakenings assessment through use monitors diaries, (3) well-being, health, using questionnaire. Light conditions were...
Measurement of personal light exposures and activity has gained popularity in studies the circadian rhythm its effects on human health. Calibration a batch measuring devices may be needed, especially before initiating interventional studies, but manufactory calibration every initiated study is costly for researcher therefore often left out. Still, knowledge inter-equipment variability essential seldom provided by manufactory. The aim present was to develop test method field Actiwatch...
We aimed to examine the effects of night work on salivary melatonin concentration during and subsequent mediating role light. included 254 day workers 87 who were followed 322 days 301 off work. Each was defined as 24 hour period starting from beginning a shift or waking in mornings with off. Light levels recorded synchronized diary information (start end sleep work). On average, participants provided four saliva samples per day, these analyzed for by liquid chromatography tandem mass...
The study investigated the effect of bright blue-enriched versus blue-suppressed indoor light on sleep and wellbeing healthy participants over 65 years. Twenty-nine in 20 private houses a uniform settlement Copenhagen were exposed to two epochs 3 weeks with (280 lux) (240 or vice versa from 8 13 pm randomized cross-over design. first epoch was October, second November separated by one week. Participants examined at baseline end each epoch. experimental well tolerated majority participants....
High daytime light levels may reduce the risk of affective disorders. Outdoor workers are during exposed to much higher intensities than indoor workers. A way study exposure and disease on a large scale is by use general population job matrix (JEM) combined with national employment health data. The objective this was develop JEM applicable for epidemiological studies response between exposure, disorders, other effects combining expert scores measurements. We measured intensity work hours...
Summary The light harvest in plants depends on both incident and penetration into the plant mass. A diffuse (Sca) a direct (Dir) environment were designed with otherwise identical climates using controlled daylight gas-exchange chambers. photosynthetic photon flux densities (PPFD) of Sca Dir but significantly higher fluence rate (PPFFR) was found treatment, demonstrating diffuseness. hypothesis that increased diffuseness results net photosynthesis growth objectives to quantify this for...
There is increasing use of electricity for supplemental lighting in the northern European greenhouse industry. One reason this may be to secure a high growth rate during low-light periods by an attempt increase net photosynthesis. We wanted clarify which period day resulted best 5-h light photosynthesis and growth. The tested were night, day, morning, evening. experiments carried out daylight climate chambers measuring canopy gas exchange. air temperature was 25 °C CO 2 level ≈900 ppm....
We aimed to investigate whether higher light intensity in the morning is associated with better nocturnal sleep quality and intensities evening or night have opposite effect. Light was recorded for 7 consecutive days across year among 317 indoor outdoor daytime workers Denmark (55-56° N) equipped a personal recorder. Participants reported after each sleep. Sleep measured using three parameters; disturbed index, awakening onset latency. Associations between increasing were analyzed mixed...
Abstract Earlier studies have shown that low Correlated Color Temperature of lighting (CCT) may induce a warmer thermal sensation than high CCTs at the same ambient temperature. The current study investigated if association between CCT and would persist when subjects worked on computers, were exposed for longer duration population included older whose vision changed with age. was carried out in climate chamber controllable LED where could be gradually changed. Generally, weak not...
<h3>Objective </h3> Exposure to high levels of light during night and low day time may have adverse health effects. Our aim is characterise exposure in shift, outdoor, indoor workers. <h3>Methods We recruited 535 workers that for seven days wore a Phillips Actiwatch Spectrum on the upper dominant arm work off. This device records red, green, blue white level every minute. Participants also filled diary sleep hours was synchronised with illuminance- calibrated recordings (lux)....