A week in the life of full-time office workers: Work day and weekend light exposure in summer and winter

Crowley, Stephanie J.; Molina, Thomas A.; Burgess, Helen J.

doi:10.1016/j.apergo.2014.08.006

Cited by 47 publications

(62 citation statements)

References 42 publications

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“…It is clear that large randomized clinical trials testing combination treatments in patients with carefully defined CRSWD are sorely needed [2]. Field based studies are also required, as laboratory settings often lead to an artificial restriction in activities and movement, that can for example, artificially reduce the high variability in light exposure people often receive in their homes [40]. …”

Section: Discussionmentioning

confidence: 99%

Circadian-Based Therapies for Circadian Rhythm Sleep-Wake Disorders

Burgess

Emens

2016

Curr Sleep Medicine Rep

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This review summarizes recent developments relevant to the treatment of circadian rhythm sleep-wake disorders. The clinical practice guidelines for the treatment of intrinsic circadian rhythm sleep-wake disorders is described, followed by recent treatment studies for delayed sleep-wake phase disorder, non-24 hour sleep-wake disorder, irregular sleep-wake disorder and shift work. New methods to estimate circadian phase, including home saliva collection to estimate the dim light melatonin onset, circadian questionnaires and general rules to guide light and exogenous melatonin treatments are described. New developments in light treatment are detailed, including light flashes during sleep and wearable light devices. Substances such as caffeine and alcohol, and devices such as electronic tablets are also considered for their potential to shift circadian timing. Finally, an update on melatonin supplements in the US is discussed, along with the controversy surrounding the use of melatonin supplements in patients with prediabetes or diabetes.

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Section: Discussionmentioning

confidence: 99%

Circadian-Based Therapies for Circadian Rhythm Sleep-Wake Disorders

Burgess

Emens

2016

Curr Sleep Medicine Rep

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“…The first baseline DLMO assessed in each research protocol was selected for this analysis, such that the DLMO was not influenced by any research protocol intervention (Burgess et al, 2015; Crowley et al, 2015; Burgess et al, unpublished data collected in 2012–2013). All subjects refrained from caffeine and alcohol in at least the 24 h before saliva collection, refrained from nonsteroidal anti-inflammatory drugs for at least 72 h before saliva collection, and passed a urine drug test.…”

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confidence: 99%

“…Home DLMOs that were verified as valid using objective measures of light exposure and sample timing were highly correlated with laboratory DLMOs ( r = 0.91, Burgess et al, 2015). Saliva samples were collected at half-hourly intervals starting 6 or 7 h before the average weekly bedtime and continuing until 2 or 3 h after average weekly bedtime (Burgess et al, 2015; Crowley et al, 2015). The saliva samples were radioimmunoassayed by Solidphase Inc (Portland, ME) using a commercially available kit (ALPCO Inc, Salem, NH) (Burgess et al, 2015; Crowley et al, 2015).…”

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confidence: 99%

“…Saliva samples were collected at half-hourly intervals starting 6 or 7 h before the average weekly bedtime and continuing until 2 or 3 h after average weekly bedtime (Burgess et al, 2015; Crowley et al, 2015). The saliva samples were radioimmunoassayed by Solidphase Inc (Portland, ME) using a commercially available kit (ALPCO Inc, Salem, NH) (Burgess et al, 2015; Crowley et al, 2015). The DLMO was calculated as the clock time (with linear interpolation) when the melatonin concentration exceeded the mean of 3 low consecutive daytime/early evening values plus twice the standard deviation of these points (Voultsios et al, 1997).…”

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confidence: 99%

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Comparing the Morningness-Eveningness Questionnaire and Munich ChronoType Questionnaire to the Dim Light Melatonin Onset

2015

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The dim light melatonin onset (DLMO) is the most reliable measure of central circadian timing in humans. However, it is not always possible to measure the DLMO because sample collection has to occur in the hours before usual sleep onset, it requires staff support and considerable participant effort, and it is relatively expensive. Questionnaires that ask people about the timing of their behavior, such as their sleep, may provide an easier and less expensive estimate of circadian timing. The objective of this analysis was to compare the MEQ score derived from the Morningness-Eveningness Questionnaire (MEQ) and the MSFsc derived from the Munich ChronoType Questionnaire (MCTQ) to the DLMO in the largest sample to date (N = 60). Our hypothesis was that MSFsc would correlate more highly with the DLMO than MEQ score. Our sample of 36 healthy controls and 24 patients with delayed sleep phase disorder ranged in age from 18 to 62 years. All participants slept at times of their own choosing for a week before the assessment of their DLMO. The DLMO correlated significantly with both the MEQ score (r = –0.70, p < 0.001) and MSFsc (r = 0.68, p < 0.001). A linear regression using MEQ, MSFsc, and age to predict the DLMO explained 60% of the DLMO variance. The strongest predictor of the DLMO was MSFsc (beta = 0.51, p = 0.001), followed by MEQ (beta = –0.41, p = 0.004), and age (beta = 0.26, p = 0.013). The beta values for MSFsc and MEQ score were not statistically different from each other. Nonetheless, around a 4-h range in the DLMO was observed at a given MEQ score and a given MSFsc, indicating that neither questionnaire should be exclusively used to time light or exogenous melatonin treatment, as this could result in the mistiming of these treatments relative to the DLMO, thereby potentially worsening circadian misalignment.

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“…Other studies have shown that light exposure between weekdays and weekends varies [4480]. Self-report diaries have been used in other field studies in order to estimate the light exposure of people in their every-day life [4546].…”

Section: Discussionmentioning

confidence: 99%

Seasonal Variation in Bright Daylight Exposure, Mood and Behavior among a Group of Office Workers in Sweden

Adamsson

Laike

Morita

2018

Journal of Circadian Rhythms

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The purpose of the study was to investigate seasonal variation in mood and behavior among a group of office workers in Sweden (56°N). Thirty subjects participated in this longitudinal study. The subjects kept a weekly log that included questionnaires for ratings of psychological wellbeing and daily sleep-activity diaries where they also noted time spent outdoors. The lighting conditions in the offices were subjectively evaluated during one day, five times over the year. There was a seasonal variation in positive affect and in sleep-activity behavior. Across the year, there was a large variation in the total time spent outdoors in daylight. The subjects reported seasonal variation concerning the pleasantness, variation and strength of the light in the offices and regarding the visibility in the rooms. Finally, the subjects spent most of their time indoors, relying on artificial lighting, which demonstrates the importance of the lighting quality in indoor environments.

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A week in the life of full-time office workers: Work day and weekend light exposure in summer and winter

Cited by 47 publications

References 42 publications

Circadian-Based Therapies for Circadian Rhythm Sleep-Wake Disorders

Circadian-Based Therapies for Circadian Rhythm Sleep-Wake Disorders

Comparing the Morningness-Eveningness Questionnaire and Munich ChronoType Questionnaire to the Dim Light Melatonin Onset

Seasonal Variation in Bright Daylight Exposure, Mood and Behavior among a Group of Office Workers in Sweden

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