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Social jetlag

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https://www.readbyqxmd.com/read/28215240/morningness-eveningness-correlates-with-sleep-time-quality-and-hygiene-in-secondary-school-students-a-multilevel-analysis
#1
Christian Vollmer, Konrad S Jankowski, Juan F Díaz-Morales, Heike Itzek-Greulich, Peter Wüst-Ackermann, Christoph Randler
At the onset of puberty, students shift their sleep to later hours, but school starts early. It is suggested that evening orientation and early school start times do not go well together. Therefore, the aim of this study was to investigate sleep problems in adolescence, and it was expected that the adolescents' eveningness orientation is associated with many sleep-related problems. Students of secondary education (n = 3201; mean = 13.8 ± 1.8 years) filled out a self-report questionnaire containing measures of morningness-eveningness, sleep time (midpoint of sleep, social "jetlag"), sleep length (on schooldays and on weekends), sleep quality, and sleep hygiene as well as questions on electronic screen media use...
February 2017: Sleep Medicine
https://www.readbyqxmd.com/read/28128995/later-chronotype-is-associated-with-higher-hemoglobin-a1c-in-prediabetes-patients
#2
Thunyarat Anothaisintawee, Dumrongrat Lertrattananon, Sangsulee Thamakaison, Kristen L Knutson, Ammarin Thakkinstian, Sirimon Reutrakul
The circadian system is known to play a role in glucose metabolism. Chronotype reflects the interindividual variability in the phase of entrainment. Those with later chronotype typically prefer later times in the day for different activities such as sleep or meals. Later chronotype has been shown to be associated with metabolic syndrome, increased diabetes risk and poorer glycemic control in type 2 diabetes patients. In addition, "social jetlag", a form of circadian misalignment due to a mismatch between social rhythms and the circadian clock, has been shown to be associated with insulin resistance...
January 27, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28006966/social-jetlag-among-night-workers-is-negatively-associated-with-the-frequency-of-moderate-or-vigorous-physical-activity-and-with-energy-expenditure-related-to-physical-activity
#3
Mariana Silva Alves, Raphael Zardini Andrade, Graciele Cristina Silva, Maria Carliana Mota, Sabrina Gonçalves Resende, Kely Raspante Teixeira, Bruna Fernandes Gonçalves, Cibele Aparecida Crispim
This cross-sectional study analyzed the association between physical activity (PA) and social jetlag (SJL) among shift workers. We evaluated 423 employees, aged between 18 and 60 years, who worked in a poultry-processing company in Brazil. Physical activity levels (PAL) were determined by the short form of the International Physical Activity Questionnaire (IPAQ-SF). SJL was calculated as the absolute difference between the time of mid-sleep on work and free days. The percentage of workers insufficiently active was high on all shifts, with no significant differences between the 3 shifts...
December 1, 2016: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/27715324/social-jetlag-affects-subjective-daytime-sleepiness-in-school-aged-children-and-adolescents-a-study-using-the-japanese-version-of-the-pediatric-daytime-sleepiness-scale-pdss-j
#4
Yoko Komada, Raoul Breugelmans, Christopher L Drake, Shun Nakajima, Norihisa Tamura, Hideki Tanaka, Shigeru Inoue, Yuichi Inoue
The aim of this study was to elucidate the level of daytime sleepiness in Japanese school-aged children and adolescents, and to examine associated factors including sleep loss and social jetlag using the Japanese version of the Pediatric Daytime Sleepiness Scale (PDSS-J). After the linguistic validation of the PDSS-J with a multi-step translation methodology, consisting of forward translation, back translation, expert review and cognitive debriefing interviews, we conducted a psychometric validation for 492 students aged 11-16 years (46...
2016: Chronobiology International
https://www.readbyqxmd.com/read/27668457/sleep-quality-chronotype-and-social-jetlag-differentially-associate-with-symptoms-of-attention-deficit-hyperactivity-disorder-in-adults
#5
Niall M McGowan, Bogdan I Voinescu, Andrew N Coogan
Attention deficit hyperactivity disorder (ADHD) is a common neurobehavioural disorder which has been associated with sleep and circadian rhythm disturbances. Numerous studies have linked evening circadian typology with traits and behaviours associated with the disorder, although a precise reason for this relationship has not been clarified. The current study examines ADHD symptoms, impulsivity, cognitive failures, sleep quality and chronotype in a cohort of healthy young adults (N = 396). Results show significant, small magnitude associations between mid-point of sleep on free days, social jetlag (SJL) and ADHD symptoms and impulsivity, although not with cognitive failures...
2016: Chronobiology International
https://www.readbyqxmd.com/read/27572002/association-between-morningness-and-resilience-in-korean-college-students
#6
So-Jin Lee, Chul-Soo Park, Bong-Jo Kim, Cheol-Soon Lee, Boseok Cha, Yu Jin Lee, Minah Soh, Jin Ah Park, Park So Young, Eun Hye Song
Circadian typology and sleep quality may be essential factors associated with the promotion of resilience. However, previous studies investigating the association between circadian typology and resilience did not analyze the effects of sleep quality on resilience. Thus, the present study evaluated the association between circadian typology and resilience in Korean college students after controlling for sleep quality. Additionally, this study investigated several sleep-related variables, including sleep duration, social jetlag and sunlight exposure during the daytime, to examine the modifiable behavioral features of morningness and also investigated whether the findings regarding morningness-related modifiable habits were associated with resilience...
2016: Chronobiology International
https://www.readbyqxmd.com/read/27530460/impact-of-sleep-behavior-on-glycemic-control-in-type-1-diabetes-the-role-of-social-jetlag
#7
Sandra Larcher, Anne-Sophie Gauchez, Sandrine Lablanche, Jean-Louis Pépin, Pierre-Yves Benhamou, Anne-Laure Borel
BACKGROUND: Sleep behavior is changing toward shorter sleep duration and a later chronotype. It results in a sleep debt that is acquitted on work-free days, inducing a small but recurrent sleep misalignment each week, referred to as "social jetlag". These sleep habits could affect health through misalignment with circadian rhythms. OBJECTIVES: The primary objective is to address the impact of sleep behavior on glycemic control, assessed by HbA1c, in patients with type 1 diabetes, independently of other lifestyle or sleep-related factors...
November 2016: European Journal of Endocrinology
https://www.readbyqxmd.com/read/27449476/short-blue-light-pulses-30-min-in-the-morning-support-a-sleep-advancing-protocol-in-a-home-setting
#8
Moniek Geerdink, Thijs J Walbeek, Domien G M Beersma, Vanja Hommes, Marijke C M Gordijn
Many people in our modern civilized society sleep later on free days compared to work days. This discrepancy in sleep timing will lead to so-called 'social jetlag' on work days with negative consequences for performance and health. Light therapy in the morning is often proposed as the most effective method to advance the circadian rhythm and sleep phase. However, most studies focus on direct effects on the circadian system and not on posttreatment effects on sleep phase and sleep integrity. In this placebo-controlled home study we investigated if blue light, rather than amber light therapy, can phase shift the sleep phase along with the circadian rhythm with preservation of sleep integrity and performance...
October 2016: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/27226819/extreme-late-chronotypes-and-social-jetlag-challenged-by-antarctic-conditions-in-a-population-of-university-students-from-uruguay
#9
Bettina Tassino, Stefany Horta, Noelia Santana, Rosa Levandovski, Ana Silva
In humans, a person's chronotype depends on environmental cues and on individual characteristics, with late chronotypes prevailing in youth. Social jetlag (SJL), the misalignment between an individual׳s biological clock and social time, is higher in late chronotypes. Strong SJL is expected in Uruguayan university students with morning class schedules and very late entertainment activities. Sleep disorders have been reported in Antarctic inhabitants, that might be a response to the extreme environment or to the strictness of Antarctic life...
January 2016: Sleep Science
https://www.readbyqxmd.com/read/27198945/the-influence-of-school-time-on-sleep-patterns-of-children-and-adolescents
#10
Alicia Carissimi, Fabiane Dresch, Alessandra Castro Martins, Rosa Maria Levandovski, Ana Adan, Vincenzo Natale, Monica Martoni, Maria Paz Hidalgo
OBJECTIVE: This epidemiological study evaluated the impact of school time on sleep parameters of children and adolescents. METHODS: This cross-sectional study involved 639 elementary and high school students (mean age 13.03 years, range 8-18, 58.5% female) from the south of Brazil. Participants answered the Morningness-Eveningness Questionnaire (MEQ), and were asked about their sleeping habits on weekdays and weekends. Sleep deficit was defined as the difference between sleep duration on weekdays and weekends...
March 2016: Sleep Medicine
https://www.readbyqxmd.com/read/27103930/diurnal-preference-predicts-phase-differences-in-expression-of-human-peripheral-circadian-clock-genes
#11
Andrew Ferrante, David Gellerman, Ahmet Ay, Kerri Pruitt Woods, Allan Michael Filipowicz, Kriti Jain, Neil Bearden, Krista Kenyon Ingram
BACKGROUND: Circadian rhythms play an integral role in human behavior, physiology and health. Individual differences in daily rhythms (chronotypes) can affect individual sleep-wake cycles, activity patterns and behavioral choices. Diurnal preference, the tendency towards morningness or eveningness among individuals, has been associated with interpersonal variation in circadian clock-related output measures, including body temperature, melatonin levels and clock gene mRNA in blood, oral mucosa, and dermal fibroblast cell cultures...
June 5, 2015: Journal of Circadian Rhythms
https://www.readbyqxmd.com/read/27101215/wrist-temperature-and-cortisol-awakening-response-in-humans-with-social-jetlag-in-the-north
#12
Artem S Polugrudov, Alexander S Panev, Vasily V Smirnov, Nikita M Paderin, Mikhail F Borisenkov, Sergey V Popov
The discrepancy between biological and social rhythms known as social jetlag (SJL) is common in modern society and has a range of negative consequences for cognitive functioning, well-being and health. Social jetlag is typical for people with late chronotypes. As shown earlier, the prevalence of individuals with a late chronotype is higher among the residents of high latitudes. Therefore, a higher rate of detection of people with SJL should be expected in the North. In this study we assessed the detection rate of SJL among 62 young inhabitants of the European North of Russia (the Komi Republic), and the relationship between SJL, the circadian rhythm of the wrist temperature, and the cortisol awakening response (CAR)...
2016: Chronobiology International
https://www.readbyqxmd.com/read/27092579/are-chronotype-social-jetlag-and-sleep-duration-associated-with-health-measured-by-work-ability-index
#13
Mei Yong, Dorothee Fischer, Christina Germann, Stefan Lang, Céline Vetter, Christoph Oberlinner
The present study investigates the impact of chronotype, social jetlag and sleep duration on self-perceived health, measured by Work Ability Index (WAI), within an industrial setting. Between 2011 and 2013, 2474 day and shift workers participated in a health check offered by an occupational health promotion program and filled out the Munich ChronoType Questionnaire (adapted to the rotational 12-h schedule for shift workers) and the WAI. We computed sleep duration on work and free days, chronotype, and social jetlag...
2016: Chronobiology International
https://www.readbyqxmd.com/read/27070173/chronotype-social-jetlag-and-sleep-debt-are-associated-with-dietary-intake-among-brazilian-undergraduate-students
#14
Catarina Mendes Silva, Maria Carliana Mota, Mariana Tavares Miranda, Samantha Lemos Paim, Jim Waterhouse, Cibele Aparecida Crispim
Undergraduate students experience a form of circadian misalignment - known as "social jetlag" - that represents the discrepancy in timing between their circadian and social clocks. Whilst social jetlag is not dependent upon chronotype, the two phenomena tend to be related; evening types show a tendency to have a greater social jetlag, for example. Moreover, evening types have been found to be more likely to have inadequate eating habits than do morning types. The objective of this study was to examine the relationship between chronotype, social jetlag, perceived sleep debt and dietary intake in Brazilian undergraduate students...
2016: Chronobiology International
https://www.readbyqxmd.com/read/26745752/a-unique-fast-forwards-rotating-schedule-with-12-h-long-shifts-prevents-chronic-sleep-debt
#15
Dorothee Fischer, Céline Vetter, Christoph Oberlinner, Sven Wegener, Till Roenneberg
Sleep debt--together with circadian misalignment--is considered a central factor for adverse health outcomes associated with shift work. Here, we describe in detail sleep-wake behavior in a fast-forward rotating 12-h shift schedule, which involves at least 24 hours off after each shift and thus allows examining the role of immediate recovery after shift-specific sleep debt. Thirty-five participants at two chemical plants in Germany were chronotyped using the Munich ChronoType Questionnaire for Shift-Workers (MCTQ(Shift)) and wore actimeters throughout the two-week study period...
2016: Chronobiology International
https://www.readbyqxmd.com/read/26709878/sleep-wake-pattern-chronotype-and-seizures-in-patients-with-epilepsy
#16
Su Jung Choi, Eun Yeon Joo, Seung Bong Hong
PURPOSE: Although mounting evidence suggests that sleep and epilepsy are reciprocal and seizures influence circadian rhythms, sleep-wake pattern and seizure control have not been widely researched. This study aimed to investigate the association of sleep-wake pattern, sleep quality, and chronotype with seizures in patients with epilepsy (PWE). METHODS: 160 consecutive PWE (aged 20-49 years, focal epilepsy, FE: generalized epilepsy, GE=127:33) and 130 age-gender matched healthy controls (HC) were enrolled...
February 2016: Epilepsy Research
https://www.readbyqxmd.com/read/26657326/circadian-clock-control-of-liver-metabolic-functions
#17
REVIEW
Hans Reinke, Gad Asher
The circadian clock is an endogenous biological timekeeping system that synchronizes physiology and behavior to day/night cycles. A wide variety of processes throughout the entire gastrointestinal tract and notably the liver appear to be under circadian control. These include various metabolic functions such as nutrient uptake, processing, and detoxification, which align organ function to cycle with nutrient supply and demand. Remarkably, genetic or environmental disruption of the circadian clock can cause metabolic diseases or exacerbate pathological states...
March 2016: Gastroenterology
https://www.readbyqxmd.com/read/26580236/social-jetlag-chronotype-and-cardiometabolic-risk
#18
Patricia M Wong, Brant P Hasler, Thomas W Kamarck, Matthew F Muldoon, Stephen B Manuck
CONTEXT: Shift work, which imposes a habitual disruption in the circadian system, has been linked to increased incidence of cardiometabolic diseases, and acute circadian misalignment alters various metabolic processes. However, it remains unclear whether day-to-day circadian dysregulation contributes to these risks beyond poor sleep and other behavioral characteristics. OBJECTIVE: Individuals differ in circadian phase preference, known as chronotype, but may be constrained by modern work obligations to specific sleep schedules...
December 2015: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/26507124/perceived-morningness-eveningness-predicts-academic-adjustment-and-substance-use-across-university-but-social-jetlag-is-not-to-blame
#19
Royette Tavernier, Melanie Munroe, Teena Willoughby
Past research has consistently found that evening-types typically report poorer academic adjustment and higher levels of substance use compared to morning-types. An important development within the morningness-eveningness and psychosocial adjustment literature has been the hypothesis that social jetlag (i.e. the asynchrony between an individual's "biological" and "social" clocks) is one factor that may explain why evening-types are at a greater risk for negative psychosocial adjustment. Yet, only a handful of studies have assessed social jetlag...
2015: Chronobiology International
https://www.readbyqxmd.com/read/26317786/associations-of-chronotype-with-social-jetlag-and-behavioral-problems-in-preschool-children
#20
Yuriko Doi, Kaneyoshi Ishihara, Makoto Uchiyama
The timing, duration, and intensity of sleep are determined by the interaction between a sleep-wake-dependent homeostatic process and a sleep-wake-independent, intrinsic, clock-like circadian process. Chronotype represents individual differences in diurnal preferences, which are not only genetically determined but also influenced by social and environmental factors. Thus, the discrepancy between biological and social clocks, so-called "social jetlag", occurs. Chronotype, social jetlag, and the links between chronotype and behavioral problems are well documented in adults and adolescents...
2015: Chronobiology International
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