How can social jetlag affect health?

Roenneberg, Till

doi:10.1038/s41574-023-00851-2

Cited by 30 publications

(14 citation statements)

References 10 publications

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“…Disproportionate data loss at night from nonwear or wear fatigue may further increase the minimum assessment duration needed to achieve stability in these measures. Similarly, our observations also suggest that greater nonwear on weekends versus weekdays may contribute to a need for longer assessment periods for parameters such as social jet lag—the difference between the mid-point of sleep on the weekend and weekdays (38,39). In general, parameters aiming to quantify trends over time, for instance measures of behavior frequency (e.g., days taking ≥8000 steps) or circadian metrics (e.g., interdaily stability, intradaily variability, sleep regularity), may be more affected by a nonrandom increase in data loss with time.…”

Section: Discussionmentioning

confidence: 55%

Does Wrist-Worn Accelerometer Wear Compliance Wane over a Free-Living Assessment Period? An NHANES Analysis

LAMUNION,

BRYCHTA,

SAINT-MAURICE

et al. 2023

Medicine &Amp; Science in Sports &Amp; Exercise

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Purpose Accelerometers are used to objectively measure physical behaviors in free-living environments, typically for ≥7 consecutive days. We examined whether participants experience “wear fatigue”, a decline in wear time day over day, during typical assessment period acquired in a nationally representative sample of 6-80-year-olds in the United States (U.S.). Methods Participants were instructed to wear an ActiGraph GT3X+ on their non-dominant wrist continuously for 7 consecutive days. Participants with seven complete days of recorded data, regardless of wear status, were included in the analyses (N = 13,649). Wear was scored with the Sleep-Wake-and-Nonwear (SWaN) algorithm. Results Participants averaged 1248 ± 3.6 (Mean ± SE) min·day-1 of wear over the assessment but wear time linearly decreased from day 1 (1295 ± 3.2 minutes) to day 7 (1170 ± 5.3 minutes) resulting in a wear fatigue of -18.1 ± 0.7 min·day-1 (β ± SE). Wear fatigue did not differ by sex but varied by age group - highest in adolescents (-26.8 ± 2.4 min·day-1) and lowest in older adults (-9.3 ± 0.9 min·day-1). Wear was lower in evening (18:00-23:59) and early morning (00:00-05:59) compared to the middle of the day and on weekend days compared to weekdays. We verified similar wear fatigue (-23.5 ± 0.7 min·day-1) in a separate sample (N = 14,631) with hip-worn devices and different wear-scoring. Applying minimum wear criteria of ≥10 h·day-1 for ≥4 days reduced wear fatigue to -5.3 mins·day-1 and -18.7 mins·day-1 for the wrist and hip, respectively. Conclusions Patterns of wear suggest non-compliance may disproportionately affect estimates of sleep and sedentary behavior, particularly for adolescents. Further study is needed to determine the impact of wear fatigue on longer assessments.

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Section: Discussionmentioning

confidence: 55%

Does Wrist-Worn Accelerometer Wear Compliance Wane over a Free-Living Assessment Period? An NHANES Analysis

LAMUNION,

BRYCHTA,

SAINT-MAURICE

et al. 2023

Medicine &Amp; Science in Sports &Amp; Exercise

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“…There are three clocks governing circadian biology: (1) the biological clock in circadian time that controls our physiology (i.e., endogenous circadian system), ( 2) the social clock in local time that organizes our lives (e.g., work, school, and social commitments), and (3) the sun clock in solar time that is derived from the natural 24-hour light/dark schedule set by the sun. [8][9][10] The biological clock requires zeitgebers to entrain (or synchronize) to the sun clock (rather than the social clock), with the strongest zeitgebers being environmental light from the sun. 1,2,48 The phase of entrainment refers to the alignment of the biological clock with the sun clock, 49 and chronotype is defined as the variability in phase of entrainment.…”

Section: Discussionmentioning

confidence: 99%

“…5,7 In circadian biology, the biological clock refers to the endogenous circadian system, the social clock refers to our social and work commitments, and the sun clock refers to the light/dark cycle. [8][9][10] Circadian disruption occurs when there is a misalignment between the biological clock and the sun clock. 7,11 Sources of circadian disruption, which include night shift work and social jetlag, have been associated with adverse human health outcomes including cancer.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal light exposure modeling for environmental circadian misalignment and solar jetlag

VoPham,

Ton,

Weaver

2024

Environmental Epidemiology

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Background: Light exposure is the most powerful resetting signal for circadian rhythms. The objective of this study was to develop and validate a high-resolution geospatial light exposure model that measures environmental circadian misalignment (or solar jetlag) as the mismatch between the social clock and sun clock, which occurs from geographic variation in light exposure leading to delayed circadian phase from relatively less morning light exposure and greater evening light exposure with increasing westward position within a time zone. Methods: The light exposure model (30 m2 spatial resolution) incorporated geospatial data across the United States on time zones, elevation (using Google Earth Engine), sunrise time, and sunset time to estimate solar jetlag scores (higher values indicate higher environmental circadian misalignment). The validation study compared the light exposure model in 2022, which was linked with geocoded residential addresses of n = 20 participants in Boston, MA (eastern time zone position) and Seattle, WA (western time zone position) using a geographic information system, with illuminance values captured from wearable LYS light sensors and with sun times from the Solar Calculator. Results: Western versus eastern positions within a time zone were associated with higher solar jetlag scores from the light exposure model (P < 0.01) and relatively larger differences in sunset time measured using light sensors (social clock) and the Solar Calculator (sun clock) (P = 0.04). Conclusion: We developed and validated a geospatial light exposure model, enabling high spatiotemporal resolution and comprehensive characterization of geographic variation in light exposure potentially impacting circadian phase in epidemiologic studies.

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“…It can be hypothesised that increased SJL may disrupt processes governing eye development. Alternatively, an increased SJL might be desirable-individuals generally accumulate sleep debt over workdays, which is counterbalanced by longer sleep on the weekends 54 . A larger difference between the midpoint of sleep on working and free days can thus indicate voluntary sleep extension on the weekends, which can serve to dissipate sleep debt 54 , complicating the interpretation of this finding.…”

Section: Discussionmentioning

confidence: 99%

Myopia and hyperopia are associated with opposite chronotypes in a sample of 71,016 individuals

Palumaa,

Taba,

Teder-Laving

et al. 2024

Preprint

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Myopia, projected to affect half of the global population by 2050, is a growing healthcare concern. Chronotype, an output of the human biological clock, and sleep parameters have been associated with several diseases, including myopia. We explored the connection between refractive errors and sleep and circadian rhythm parameters by employing a sample of 71,016 adults who completed the Munich Chronotype Questionnaire in the Estonian Biobank. After accounting for possible confounders, such as age, sex, education level, and duration of daylight exposure, we observed that individuals with late chronotype, characterised by a delayed sleep-wake pattern on free days, had higher odds for myopia. In contrast, early chronotype was associated with hyperopia. Furthermore, increased social jet lag and reduced sleep duration were associated with both myopia and hyperopia. These results emphasise the complex interplay between circadian rhythms and sleep in refractive development, with potential implications for public health and clinical practice.

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How can social jetlag affect health?

Cited by 30 publications

References 10 publications

Does Wrist-Worn Accelerometer Wear Compliance Wane over a Free-Living Assessment Period? An NHANES Analysis

Does Wrist-Worn Accelerometer Wear Compliance Wane over a Free-Living Assessment Period? An NHANES Analysis

Spatiotemporal light exposure modeling for environmental circadian misalignment and solar jetlag

Myopia and hyperopia are associated with opposite chronotypes in a sample of 71,016 individuals

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