Preflight Adjustment to Eastward Travel:3 Days of Advancing Sleep with and without Morning Bright Light

Burgess, Helen J.; Crowley, Stephanie J.; Gazda, Clifford J.; Fogg, Louis; Eastman, Charmane I.

doi:10.1177/0748730403253585

Cited by 132 publications

(109 citation statements)

References 34 publications

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“…On the basis of previous studies (3,10,45), we expected a robust phase delay for both BL and IBL exposure. Indeed, the dynamic-resetting model developed by Kronauer et al (32,38,39) predicted that the phase shift after IBL would be ϳ70% of that after BL.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, 3 consecutive days of exposure to six 40-min pulses of bright light (ϳ5,000 lux) have been shown to phase delay circadian rhythms in humans (3). In other studies, 3-5 consecutive days of exposure to intermittent pulses of bright light (3,000 -11,000 lux) as brief as 5 min in duration have been shown to induce phase advances of the endogenous circadian pacemaker in humans (10,11,45). These findings suggest that humans, like animals, are sensitive to brief bright light pulses.…”

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confidence: 99%

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Efficacy of a single sequence of intermittent bright light pulses for delaying circadian phase in humans

Gronfier¹,

Wright²,

Kronauer³

et al. 2004

American Journal of Physiology-Endocrinology and Metabolism

172

148

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It has been shown in animal studies that exposure to brief pulses of bright light can phase shift the circadian pacemaker and that the resetting action of light is most efficient during the first minutes of light exposure. In humans, multiple consecutive days of exposure to brief bright light pulses have been shown to phase shift the circadian pacemaker. The aim of the present study was to determine whether a single sequence of brief bright light pulses administered during the early biological night would phase delay the human circadian pacemaker. Twenty-one healthy young subjects underwent a 6.5-h light exposure session in one of three randomly assigned conditions: 1) continuous bright light of ∼9,500 lux, 2) intermittent bright light (six 15-min bright light pulses of ∼9,500 lux separated by 60 min of very dim light of <1 lux), and 3) continuous very dim light of <1 lux. Twenty subjects were included in the analysis. Core body temperature (CBT) and melatonin were used as phase markers of the circadian pacemaker. Phase delays of CBT and melatonin rhythms in response to intermittent bright light pulses were comparable to those measured after continuous bright light exposure, even though the total exposure to the intermittent bright light represented only 23% of the 6.5-h continuous exposure. These results demonstrate that a single sequence of intermittent bright light pulses can phase delay the human circadian pacemaker and show that intermittent pulses have a greater resetting efficacy on a per minute basis than does continuous exposure.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Efficacy of a single sequence of intermittent bright light pulses for delaying circadian phase in humans

Gronfier¹,

Wright²,

Kronauer³

et al. 2004

American Journal of Physiology-Endocrinology and Metabolism

172

148

View full text Add to dashboard Cite

show abstract

“…Our study represents the first validation of a jet lag questionnaire by different measurement tools. The AASM encourages the combination of flexible evaluation methods (Morgenthaler et al, 2007b) such as actigraphy and sleep diaries to enable broader insights into individual symptoms and to supplement data for monitoring sleep pattern processes (Burgess et al, 2003;Eastman et al, 2005). Evidence for the validity of the CJS is assessed by the comparison of corresponding and related data from the various methods.…”

Section: Discussionmentioning

confidence: 99%

“…In jet lag research, the application of actigraphy in combination with sleep diaries is the alternative of choice for participants who travel extensively (Burgess et al, 2003;Beaumont et al, 2004;Eastman et al, 2005). However, laboratory simulation studies with PSG (Burke et al, 2013;Moline et al, 1992;Morgenthaler et al, 2007b) do not accurately reflect realistic travel conditions, since many variables from real life-such as those associated with food intake times, light, and hotel beds-cannot be realistically simulated in a laboratory.…”

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confidence: 99%

Evaluation of the Charité Jet Lag Scale

2015

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The first German Charité Jet Lag Scale (CJS), based on the only validated English questionnaire, was introduced in a former study. In addition to providing further jet lag investigations, this second method-comparison study aims to evaluate the CJS. Consistent interviewing methods are essential for future research in identifying possible cross-cultural tendencies, advancing jet lag definition, and establishing potential alleviation methods. Jet lag in 17 German chorus members (5 male, 12 female, mean age 42.35 ± 13.06 years) was monitored on their 2½-week trip from Germany to Argentina and back by use of actigraphy, sleep diaries, and the CJS. Cronbach’s alpha, Pearson and Lin correlations, and Bland-Altman diagrams were applied to assess CJS reliability and validity between all measurement methods. CJS study analysis results reconfirmed the prevalence of jet lag at approximately 60%. Moreover, the study assessed high Cronbach’s alpha values and significant positive correlations for several corresponding and related sleep parameters and CJS items such as total sleep time (TST) and sleep onset latency (SOL). The confidence limits in the Bland-Altman diagrams remained within the limits of earlier studies (TST ± 1 h, SOL ± 30 min). Overall, jet lag measures in this study confirmed previous jet lag studies. Evidence indicates positive reliability and validity of the CJS, with lower specificity in some parameters. We conclude that the CJS is applicable for complex jet lag studies. The findings provide support for further development of the scale and its capability as a consistent jet lag interviewing method.

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“…In a common process known as antidromic re-entrainment, phase shifts occur in a direction opposite to the shift in external time (eg, a phase delay instead of a phase advance occurs subsequent to eastward travel), the occurrence of which is dependent upon the number of time zones crossed and ambient light exposure in the local area, as reviewed elsewhere. 17,20 Preventative strategies to reduce the occurrence of this phenomenon will be discussed in more detail below.…”

Section: Jet Lag Sleep Disorder Description and Predisposing Factorsmentioning

confidence: 99%

Circadian rhythm sleep disorders

Kolla¹,

Auger²,

Morgenthaler³

2012

CPT

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Misalignment between endogenous circadian rhythms and the light/dark cycle can result in pathological disturbances in the form of erratic sleep timing (irregular sleep-wake rhythm), complete dissociation from the light/dark cycle (circadian rhythm sleep disorder, free-running type), delayed sleep timing (delayed sleep phase disorder), or advanced sleep timing (advanced sleep phase disorder). Whereas these four conditions are thought to involve predominantly intrinsic mechanisms, circadian dysrhythmias can also be induced by exogenous challenges, such as those imposed by extreme work schedules or rapid transmeridian travel, which overwhelm the ability of the master clock to entrain with commensurate rapidity, and in turn impair approximation to a desired sleep schedule, as evidenced by the shift work and jet lag sleep disorders. This review will focus on etiological underpinnings, clinical assessments, and evidence-based treatment options for circadian rhythm sleep disorders. Topics are subcategorized when applicable, and if sufficient data exist. The length of text associated with each disorder reflects the abundance of associated literature, complexity of management, overlap of methods for assessment and treatment, and the expected prevalence of each condition within general medical practice.

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Preflight Adjustment to Eastward Travel:3 Days of Advancing Sleep with and without Morning Bright Light

Cited by 132 publications

References 34 publications

Efficacy of a single sequence of intermittent bright light pulses for delaying circadian phase in humans

Efficacy of a single sequence of intermittent bright light pulses for delaying circadian phase in humans

Evaluation of the Charité Jet Lag Scale

Circadian rhythm sleep disorders

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