Circadian Light Exposures of Shift Working Nurses

Price, Luke; Udovicic, Ljiljana; Khazova, Marina

doi:10.25039/x46.2019.pp30

Cited by 3 publications

(8 citation statements)

References 10 publications

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“…In total, 104 studies were deemed eligible and formed the set of dosimetry field studies reviewed here. An overview of the selected studies 10 …”

Section: Review Methodsmentioning

confidence: 99%

“…Some studies additionally examined the light data for smooth periods with little fluctuation, indicating invalid periods. 31,69,81 Furthermore, several methods for identifying measurement artefacts due to sensor obstruction have been reported. Some studies ( N = 13) identified artefacts as light measurements below a threshold value during day- or wake-time, ranging from 0 lx to10 lx across studies.…”

Section: Methodological Considerationsmentioning

confidence: 99%

“…Note that smoothing methods can also be used as an analytical procedure, for example, to quantify light dose in time by mimicking non-visual response characteristics. 81 Beside smoothing, some studies ( N = 15) averaged the data into bins (e.g. hourly averages), which can also be considered a means to remove noise in the data.…”

Section: Methodological Considerationsmentioning

confidence: 99%

“…Since the melanopic sensitivity curve matches the sensitivity of non-visual responses for a wide range of conditions (Brown, 2020), studies could use devices that match this curve until spectrally resolved devices 1 become available (cf. Maren et al, 2018;Price, Udovicic and Khazova, 2019;Lee et al, 2020).…”

Section: Dosimeter Selection and Optical Quantitiesmentioning

confidence: 99%

“…Invalid periods were identified by some studies (N=18) based on concomitant inactivity longer than a given timeframe, which ranged from 5-120min across studies. Some studies additionally examined the light data for smooth periods with little fluctuation, indicating invalid periods (Daugaard et al, 2017;Maren et al, 2018;Price, Udovicic and Khazova, 2019). Furthermore, several methods for identifying measurement artifacts due to sensor obstruction have been reported.…”

Section: Data Preparation Data Cleaningmentioning

confidence: 99%

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Towards a framework for light-dosimetry studies: Methodological considerations

Hartmeyer

Webler

Andersen

2022

Lighting Research & Technology

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For field research of non-visual effects of light, accurate measurement of personal light exposure is required. A consensus framework for light-dosimetry could improve non-visual field research and ensure comparability between studies. Here, we present a review of methodologies used in non-visual light-dosimetry studies published to date, focussing on considerations regarding the measurement and preparation of personal light exposure data. Overall, a large variability in the studies’ methodologies is observed, highlighting the need for a consensus framework. We propose methodological considerations that should be included in such a framework and that can guide future studies. Furthermore, we highlight important points that should be addressed in future research to ensure compatibility between different dosimetry studies. Taken together, this review effort underlines the importance of a systematic approach to light-dosimetry in order to harness all the power of integrative lighting research in real life.

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“…In total, 104 studies were deemed eligible and formed the set of dosimetry field studies reviewed here. An overview of the selected studies 10 …”

Section: Review Methodsmentioning

confidence: 99%

Section: Methodological Considerationsmentioning

confidence: 99%

Section: Methodological Considerationsmentioning

confidence: 99%

Section: Dosimeter Selection and Optical Quantitiesmentioning

confidence: 99%

Section: Data Preparation Data Cleaningmentioning

confidence: 99%

See 3 more Smart Citations

Towards a framework for light-dosimetry studies: Methodological considerations

Hartmeyer

Webler

Andersen

2022

Lighting Research & Technology

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Collecting, detecting and handling non-wear intervals in longitudinal light exposure data

Guidolin,

Zauner,

Hartmeyer

et al. 2024

Preprint

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In field studies using wearable light loggers, participants often need to remove the devices, resulting in non-wear intervals of varying and unknown duration. Accurate detection of these intervals is an essential step in data pre-processing pipelines. However, the limited reporting on whether and how non-wear information is collected and detected has hindered the development of effective data pre-processing strategies and automated detection algorithms. Here, we deploy a multi-modal approach to collect non-wear time during a longitudinal light exposure campaign and systematically compare non-wear detection strategies. Healthy participants (n=26; mean age 28±5 years, 14F) wore a near-corneal plane light logger for one week and reported non-wear events in three ways: pressing an "event marker" button on the light logger, placing it in a black bag, and using an app-based Wear log. Wear log entries were checked twice a day to ensure high data quality and used as ground truth for non-wear interval detection. Participants showed high adherence to the protocol, with non-wear time constituting 5.4±3.8% (mean±SD) of total participation time. Considering button presses, our results indicated that extending time windows beyond one minute improved their detection at the start and end of non-wear intervals, achieving identification in >85.4% of cases. To detect non-wear intervals based on black bag use, we applied an algorithm detecting clusters of low illuminance to our data and compared its performance to detecting clusters of low activity. Performance was higher for illuminance (F1=0.76) than activity (F1=0.52). Transition states between wear and non-wear emerged as a major source of misclassification, and we suggest that combining illuminance and activity data could enhance detection accuracy. Lastly, we compared light exposure metrics averaged across the week derived from three datasets: the full dataset, a dataset filtered for non-wear based on self-reports, and a dataset filtered for non-wear using the low illuminance clusters detection algorithm. The differences in light exposure metrics across these datasets were minimal. Our results highlight that while non-wear detection may be less critical in high-compliance cohorts, systematically collecting and detecting non-wear intervals is both feasible and important for ensuring robust data pre-processing.

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Towards a framework for light-dosimetry studies: Quantification metrics

Hartmeyer

Andersen

2023

Lighting Research & Technology

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Light dosimetry aims to measure personal light exposure with wearable sensors, which is a complex multistep procedure. The resulting data may be used to investigate non-visual effects of light in real-life settings, to validate laboratory findings and answer questions pertaining to implications in applied contexts. However, personal light exposure patterns are usually complex and can be quantified in many ways. Various measurement and analysis methods have been applied across previous studies, complicating comparability and interpretation of results. To improve the quality and comparability of light-dosimetry research, a framework with consensus guidelines for light-dosimetry procedures is needed. To provide the groundwork towards such a framework, we reviewed previous light-dosimetry studies to identify considerations regarding measurement and data quantification. Here, we review metrics for quantifying light-dosimetry data in terms of the characteristics known to modulate non-visual responses. Overall, various metrics have been employed across studies, with several metrics for each characteristic. We provide a description of each metric, discuss their properties and provide example calculations for the application to light-dosimetry data. Moreover, we propose considerations for data quantification and possible research strategies for future studies. To facilitate exploration and use of the identified metrics, corresponding functions are provided in an openly accessible R-package.

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Circadian Light Exposures of Shift Working Nurses

Cited by 3 publications

References 10 publications

Towards a framework for light-dosimetry studies: Methodological considerations

Towards a framework for light-dosimetry studies: Methodological considerations

Collecting, detecting and handling non-wear intervals in longitudinal light exposure data

Towards a framework for light-dosimetry studies: Quantification metrics

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