Effects of seasonal illumination and thermal environments on sleep in elderly men

Tsuzuki, Kazuyo; Mori, Ikue; Sakoi, Tomonori; Kurokawa, Yoshika

doi:10.1016/j.buildenv.2014.10.001

Cited by 53 publications

(36 citation statements)

References 22 publications

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“…The mean number of minutes for which the participant was exposed to at least 1000 lx (i.e., 72 minutes in the range between 1000 and 5000 lx, see Table 6) is lower than found in the study from Tsuzuki et al 21 (180 AE 101 minutes), but higher than found in the study of Heil and Mathis 34 (36 AE 6 minutes). Although the participants in the study of Tsuzuki et al were asked to live their regular lives during their participation, it remains unclear whether they were at work or not.…”

Section: Or Possiblymentioning

confidence: 54%

“…44 This may have caused that nearly all light throughout the day was received within the daylight period. It is expected, and demonstrated in previous literature, 21,26,29,59 that the average lighting conditions in autumn and winter are lower. At all locations ( Figure 6) there is an increasing trend visible in illuminances and irradiances measured with the blue sensor area at the beginning of the day and a decreasing trend at the end of the day.…”

Section: Potential When Using Personal Lightingmentioning

confidence: 65%

“…In the majority of these studies, the focus was on the light effect (e.g. sleep, [21][22][23][24][25][26][27][28] vitality, 24,29 circadian phase, 22,[30][31][32] mood, 22,23,25,26,28 or social behaviour 33 ). Very rarely, no outcome measure was directly linked to the actual lighting conditions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Personal lighting conditions of office workers: An exploratory field study

Duijnhoven

Aarts

Kort

2020

Lighting Research & Technology

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Light enables us to see and perceive our environment but it also initiates effects beyond vision, such as alertness. Literature describes that at least six factors are relevant for initiating effects beyond vision. The exact relationship between these factors and alertness is not yet fully understood. In the current field study, personal lighting conditions of 62 Dutch office workers (aged 49.7 ± 11.4 years) were continuously measured and simultaneously self-reported activities and locations during the day were gathered via diaries. Each office worker participated 10 working days in spring 2017. Personal lighting conditions were interpreted based on four of the six factors (light quantity, spectrum, timing, and duration of light exposure). Large individual differences were found for the daily luminous exposures, illuminances, correlated colour temperatures, and irradiances measured with the blue sensor area of the dosimeter. The average illuminance (over all participants and all days) over the course of the day peaked three times. The analysis of the duration of light exposure demonstrated that the participants were on average only exposed to an illuminance above 1000 lx for 72 minutes per day. The interpretation of personal lighting conditions based on the four factors provides essential information since all of these factors may be relevant for initiating effects beyond vision. The findings in the current paper give first in-depth insight in the possibilities to interpret personal lighting conditions of office workers.

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Section: Or Possiblymentioning

confidence: 54%

Section: Potential When Using Personal Lightingmentioning

confidence: 65%

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Personal lighting conditions of office workers: An exploratory field study

Duijnhoven

Aarts

Kort

2020

Lighting Research & Technology

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“…Guidance is also available that suggests that in the absence of a means to create air movement, temperatures should be kept below 26°C [51]. The importance of this is enhanced when considering the specific context of the case study dwelling: a care setting with elderly residents [59]. The above analysis identifies that under maximum static threshold temperature analysis, the case study bedroom experiences substantial overheating in terms of both duration and severity, even when only considering non-summer night-time occupancy hours.…”

Section: Temporal Static Overheating Assessmentmentioning

confidence: 99%

An empirical evaluation of temporal overheating in an assisted living Passivhaus dwelling in the UK

Fletcher

Johnston

Glew

et al. 2017

Building and Environment

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Global concern around energy use and anthropogenic climate change have resulted in an increased effort to reduce the energy demand and CO2 emissions attributable to buildings. This has led to the development of a number of low energy building standards, one of which is the internationally recognised Passivhaus Standard.The Passivhaus Standard aims to reduce the space heating energy demand of a building by adopting a 'fabric first' approach, thus ensuring the thermal envelope is highly insulated and airtight whilst also maximising passive solar heat gains. However, adopting such an approach does present a risk of overheating; a situation that is of particular concern when the occupants have additional healthcare requirements.This study uses 21 months of in-use monitored data to consider the overheating risk in a UK Passivhaus dwelling with vulnerable occupants using both static and adaptive thermal comfort assessment methods. The analysis of the data suggests the occurrence of substantial overheating according to PHPP, CIBSE Guide A and CIBSE TM52 criteria. The analysis was then expanded to consider a novel composite method to overcome the limitations of existing approaches, allowing overheating to be assessed during non-typical periods i.e. the heating season. This revealed apparent overheating during colder months, in addition to substantial night-time overheating. This has implications for the thermal comfort assessment of low energy dwellings and the design and operation of Passivhaus buildings, particularly those with vulnerable occupants.

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“…Tsuzuki and colleagues [24] examined the seasonal influence of light on sleep in eight healthy older men (> 60 years., mean age of 64 ± 1 yrs.) in the four seasons starting in spring.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Impact of Natural Light Exposure on Sleep of Healthy Older Adults: A Field Study

Aarts

Stapel

Schoutens

et al. 2018

Journal of Daylighting

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Studies among people with dementia demonstrated that the sleep quality and rhythm improves significantly when people are exposed to ambient bright light. Since almost half of the healthy older people also indicate to suffer from chronic sleep disorders, the question arises whether ambient bright light can be beneficial to healthy older people. Particularly the effect on sleep/wake rhythm in relation to the exposure to natural light is the focus. It was hypothesised that the sleep quality would be worse in winter due to a lower daylight dose than in summer due to the lower illuminance and exposure duration. A field study was conducted to examine the relationship between daylight exposure and sleep quality in 14 healthy older adults living independently in their own dwellings in the Netherlands. All participants were asked to take part of the study both during the summer period as well as during the winter period. Therefore, they had to wear an actigraph for five consecutive days which measured sleep, activity and light exposure. Results confirmed that people were significantly longer exposed to high illumination levels (>1000 lx) in summer than in winter. Sleep quality measures, however, did not differ significantly between summer and winter. A significant, positive correlation was found between exposure duration to high illuminance from daylight during the day and the sleep efficiency the following night in summer, implying that being exposed to high illuminance for a longer time period has a positive effect on sleep efficiency for the individual data. There was also a tendency of less frequent napping in case of longer exposure duration to light for both seasons. Sleep quality does not differ between summer and winter but is related to the duration of the exposure to bright light the day prior to the night.

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Effects of seasonal illumination and thermal environments on sleep in elderly men

Cited by 53 publications

References 22 publications

Personal lighting conditions of office workers: An exploratory field study

Personal lighting conditions of office workers: An exploratory field study

An empirical evaluation of temporal overheating in an assisted living Passivhaus dwelling in the UK

Exploring the Impact of Natural Light Exposure on Sleep of Healthy Older Adults: A Field Study

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