Effects of adjustable dynamic bedroom lighting in a maternity ward (original) (raw)
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Research Square (Research Square), 2021
Maternal circadian rhythms are important for maintaining maternal and fetal homeostasis. The maternal circadian system coordinates the internal clock of the fetus with environmental lighting conditions via the melatonin signal. The intensity and wavelength of daylight in uence nocturnal melatonin production. This study aims to evaluate the effect of environmental lighting conditions on melatonin production in pregnant women with reduced mobility during hospitalization. We installed a human-centric lighting system with biodynamic effects (BDL, biodynamic lighting) in the patient rooms. The pregnant women in the patient rooms with standard indoor conditions served as a control group. The illuminance (lux) and dose of effective circadian irradiation (Hec) were recorded every 10 seconds by light dosimeters (Lucerne University, Switzerland) attached to the patients` clothing. We analyzed the illuminance status of 47 pregnant women with a median (IQR) gestational age of 29.9 (25.4-32.3) weeks of gestation. The median illuminance in the control group was signi cantly lower (p<0.05) than in the BDL group in the morning and afternoon from day 1 to 5. BDL patients had a signi cantly higher effective circadian irradiation in the morning. The effective circadian irradiation showed a signi cant daily rhythm only in the BDL group. The BDL group had a signi cantly higher melatonin production on day 3 (p=0.006) and day 6 (p=0.012) than the control group (median (IQR) 15840 (10140-22160) ng vs. 6141 (2080-11328) ng/n on day 3 and 18780 (11320-23562) ng vs. 6380 (3500-17600) ng on day 6). We have demonstrated that dramatically altered lighting conditions of hospitalized pregnant women may be optimized by installing biodynamic lighting systems in the patient rooms resulting in the maintenance of nocturnal melatonin production in pregnant women.
Chronobiology International, 2020
The maternal circadian time structure is incredibly important in the entrainment and programing of the fetal and newborn circadian time structure. Natural sunlight is the primary environmental time cue for entrainment of circadian rhythms, but high-risk pregnant women spend most of their time indoors with artificial light sources and extremely low levels of natural light both during the day and night. Because the daily level, timing, duration of light exposure and its spectral properties are important in maintaining the normal circadian physiology in humans, we aimed to evaluate the environmental lighting conditions in high-risk pregnant women admitted to hospital for long-term stay. About 30 patients were included in the study. Exposed illuminance, color temperature and effective circadian radiation dose were measured and recorded every 10 s by light dosimeters attached to the patients' clothing. We documented the illuminance of 29 pregnant women on 235 inpatient days. Median (IQR) measured illuminance was 70 (28-173) lux in the morning, 124 (63-241) lux in the afternoon, 19 (6-53) lux in the evening and 0 (0-0) lux at the night. Median illuminance for the 235 inpatient days of assessment was below the recommended EU standard of 100 lux-60.5% of the mornings and 42.7% of the afternoons. The women confined to indoor locations rarely achieved an illuminances more than 300 lux in the morning and in the afternoon. Compared to women with outdoor mobility, those confined indoors have a significantly lower illuminance and color temperature, both in the morning and in the afternoon. Our study presents the first information about the dramatically altered environmental lighting conditions experienced by high-risk pregnant women during their hospital stay. Their exposure to light while in the hospital is significantly lower than exposure to natural daylight levels and below the recommended EU standard.
Sleep, 2020
Study Objectives Blue-depleted lighting reduces the disruptive effects of evening artificial light on the circadian system in laboratory experiments, but this has not yet been shown in naturalistic settings. The aim of the current study was to test the effects of residing in an evening blue-depleted light environment on melatonin levels, sleep, neurocognitive arousal, sleepiness, and potential side effects. Methods The study was undertaken in a new psychiatric hospital unit where dynamic light sources were installed. All light sources in all rooms were blue-depleted in one half of the unit between 06:30 pm and 07:00 am (melanopic lux range: 7–21, melanopic equivalent daylight illuminance [M-EDI] range: 6–19, photopic lux range: 55–124), whereas the other had standard lighting (melanopic lux range: 30–70, M-EDI range: 27–63, photopic lux range: 64–136), but was otherwise identical. A total of 12 healthy adults resided for 5 days in each light environment (LE) in a randomized cross-ov...
2016
Background: Hospitalization in neonatal intensive care units predisposes preterm neonates to negative stimuli such as continuous 24-hour lighting. Objectives: The present study was done to evaluate the effects of a cyclical lighting model on weight gain and length of hospital stay among preterm neonates. Methods: This clinical trial was performed during year 2012 on 60 preterm neonates, who were hospitalized in the neonatal intensive care unit of Bentolhoda hospital, Bojnord, Iran. The neonates were conveniently recruited and randomly allocated to a control and an experimental group through permuted block randomization. The neonates in these groups were exposed to continuous and cyclical lighting, respectively. Their weight and sleeping time were measured both before and after the intervention. Moreover, the length of their hospital stay was documented. The data were analyzed through doing the independent-sample t and the Mann-Whitney U tests by using the SPSS software (v. 18.0) at ...
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics, 2018
Objective The aim of this study is to evaluate whether exposure to different environmental lighting conditions affects the reproductive parameters of pregnant mice and the development of their offspring. Methods Fifteen pregnant albino mice were divided into three groups: light/dark, light, and dark. The animals were euthanized on day 18 of pregnancy following the Brazilian Good Practice Guide for Euthanasia of Animals. Maternal and fetal specimens were measured and collected for histological evaluation. Analysis of variance (ANOVA) test was used for comparison of the groups considering p ≤ 0.05 to be statistically significant. Results There was no significant difference in the maternal variables between the three groups. Regarding fetal variables, significant differences were observed in the anthropometric measures between the groups exposed to different environmental lighting conditions, with the highest mean values in the light group. The histological evaluation showed the same s...
Patient room lighting influences on sleep, appraisal and mood in hospitalized people
Journal of Sleep Research, 2016
Irregular 24 h light/dark cycles with night-time light exposure and a low amplitude are disruptive for sleep, mood and circadian rhythms. Nevertheless such lighting conditions are quite common in medical care facilities. A controlled clinical trial among 196 cardiology ward patients (mean age 66.5 AE 13.1 years SD) investigated how a patient room lighting intervention affects sleep, appraisal and mood across hospitalization. Patients were either assigned to a standardly-lit room or to a room with an interventional lighting system offering a dynamic 24 h light/ dark cycle with low nocturnal light exposure and 2 h of bright light (1750 lux) during daytime. Measures included wrist actigraphy and questionnaires assessing alertness, sleep quality, anxiety, depression and lighting appraisal. The median length of hospitalization was 5 days in both study arms. Subjective scores on sleep, alertness, anxiety and depression did not differ between arms. Lighting appraisal in intervention rooms was better as compared to standardly-lit rooms, both in patients (P < 0.001) and staff (P < 0.005). Actigraphic sleep duration of patients improved by 5.9 min (95% CI: 0.6-11.2; P = 0.03 intervention 9 time effect) per hospitalization day with interventional lighting instead of standard lighting. After 5 days of hospitalization, sleep duration in the lighting intervention rooms increased by 29 min, or a relative 7.3%, as compared to standardly-lit rooms. A 24 h lighting system with enhanced daytime brightness and restricted nocturnal light exposure can improve some aspects of appraisal and objective sleep in hospital patients. More clinical research is needed to establish the best lighting strategy to promote healing and wellbeing within healthcare settings. IN TROD UCTI ON Impaired sleep is a known hospital stressor, and hospitalized patients struggle to get sufficient sleep at night due to factors like discomfort, worries, noise, inappropriate light exposure and pain (
2017
Objective: Growth and development of preterm infants may be negatively affected by constant bright light in neonatal intensive care units ( NICUs ). It may also contribute to sleep pattern disorders commonly seen in in this group of infants. Reducing exposure to light by covering the incubators is recommended by guidelines of the Neonatal Individualized Developmental Care and Assessment Program (NIDCAP). Materials and Methods: This randomized clinical trial study was performed on 60 preterm infants with gestational age of 28-32 weeks admitted at NICU of Al-Zahra Teaching Hospital of Tabriz University of Medical Sciences in 2014. Preterm infants were divided randomly in 2 groups: In the first group (intervention), incubators were covered with a thick cover and the face was covered with a cloth (face cover). In the second group (observation), incubators were covered with a thick cover but the face was not covered. We darkened the environment of NICU by closing the curtain and turning ...
Lighting, sleep and circadian rhythm: An intervention study in the intensive care unit
Intensive & critical care nursing : the official journal of the British Association of Critical Care Nurses, 2015
Patients in an intensive care unit (ICU) may risk disruption of their circadian rhythm. In an intervention research project a cycled lighting system was set up in an ICU room to support patients' circadian rhythm. Part I aimed to compare experiences of the lighting environment in two rooms with different lighting environments by lighting experiences questionnaire. The results indicated differences in advantage for the patients in the intervention room (n=48), in perception of daytime brightness (p=0.004). In nighttime, greater lighting variation (p=0.005) was found in the ordinary room (n=52). Part II aimed to describe experiences of lighting in the room equipped with the cycled lighting environment. Patients (n=19) were interviewed and the results were presented in categories: "A dynamic lighting environment", "Impact of lighting on patients' sleep", "The impact of lighting/lights on circadian rhythm" and "The lighting calms". Most ha...