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Chronotype

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https://www.readbyqxmd.com/read/29340848/validation-of-the-korean-munich-chronotype-questionnaire
#1
Sooyeon Suh, Soo Hyun Kim, Hyera Ryu, Su Jung Choi, Eun Yeon Joo
PURPOSE: The Munich Chronotype Questionnaire (MCTQ) assesses actual sleep-wake timing and has advantages compared to prior chronotype questionnaires in that it differentiates sleep-wake patterns between work days and free days and uses corrected mid-sleep time on free days after correcting for accumulated sleep debt over the week to categorize chronotype. The current study, we validated the Korean version of the MCTQ. METHODS: In this study, 310 participants (mean age = 27...
January 16, 2018: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/29339309/late-chronotype-is-associated-with-enhanced-amygdala-reactivity-and-reduced-fronto-limbic-functional-connectivity-to-fearful-versus-happy-facial-expressions
#2
Charlotte Mary Horne, Ray Norbury
Increasing evidence suggests late chronotype individuals are at increased risk of developing depression. However, the underlying neural mechanisms that confer risk are not fully understood. Here, fifty healthy, right-handed individuals without a current or previous diagnosis of depression, family history of depression or sleep disorder underwent functional magnetic resonance imaging (FMRI). Participants completed an implicit emotion processing task (gender discrimination) including happy and fearful facial expressions...
January 12, 2018: NeuroImage
https://www.readbyqxmd.com/read/29329461/high-heritability-of-adolescent-sleep-wake-behavior-on-free-but-not-school-days-a-long-term-twin-study
#3
A P Inderkum, L Tarokh
Adolescence development is characterized by significant changes in sleep biology. Despite an overall decline in sleep duration and a delay in bedtime, significant inter-individual variation in sleep has been reported. The aim of the current study was to examine genetic and environmental influences on sleep in adolescence using long-term (6-month) actigraphy measurements, differentiating between school and free days. Sixteen monozygotic (MZ; n = 32) and 10 dizygotic (DZ; n = 20) twin pairs (mean age 12.8 ± 1...
January 10, 2018: Sleep
https://www.readbyqxmd.com/read/29300497/association-of-habitual-dietary-intake-with-morningness-eveningness-and-rotating-shift-work-in-japanese-female-nurses
#4
Takahiro Yoshizaki, Taiki Komatsu, Yuki Tada, Azumi Hida, Yukari Kawano, Fumiharu Togo
Rotating shift workers are associated with imbalanced dietary intakes. Rotating shift workers and dietary intakes in adults who do not engage in night work have also been shown to be associated with chronotype. However, no studies have examined associations between morningness-eveningness (i.e., the degree to which people prefer to be active in the morning or the evening), rotating shift work and dietary intakes. Therefore, our first purpose was to elucidate the association between morningness-eveningness and habitual food group intakes in rotating shift workers...
January 4, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29283283/epidemiology-of-objectively-measured-bedtime-and-chronotype-in-us-adolescents-and-adults-nhanes-2003-2006
#5
Jacek K Urbanek, Adam P Spira, Junrui Di, Andrew Leroux, Ciprian Crainiceanu, Vadim Zipunnikov
BACKGROUND: We propose a method for estimating the timing of in-bed intervals using objective data in a large representative US sample, and quantify the association between these intervals and age, sex, and day of the week. METHODS: The study included 11,951 participants 6 years and older from the National Health and Nutrition Examination Survey (NHANES) 2003-2006, who wore accelerometers to measure physical activity for seven consecutive days. Participants were instructed to remove the device just before the nighttime sleep period and put it back on immediately after...
December 28, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29282999/the-concept-of-chronotypes-and-its-clinical-importance-for-depressive-disorders
#6
Matthias J Müller, Anja Haag
Chronobiology and chronobiological research deal with time-dependent physiological processes and behavioral correlates as well as their adaptation to environmental conditions. Chronobiological research is presently focused on the impact of circadian rhythms on human behavior. In the last three decades, chronobiology has established itself as an independent area of research evolving to an important field of clinical psychology and psychiatry. In this overview, the results of studies on the clinical importance of chronotypes are summarized...
January 1, 2017: International Journal of Psychiatry in Medicine
https://www.readbyqxmd.com/read/29276481/is-8-30-a-m-still-too-early-to-start-school-a-10-00-a-m-school-start-time-improves-health-and-performance-of-students-aged-13-16
#7
Paul Kelley, Steven W Lockley, Jonathan Kelley, Mariah D R Evans
While many studies have shown the benefits of later school starts, including better student attendance, higher test scores, and improved sleep duration, few have used starting times later than 9:00 a.m. Here we report on the implementation and impact of a 10 a.m. school start time for 13 to 16-year-old students. A 4-year observational study using a before-after-before (A-B-A) design was carried out in an English state-funded high school. School start times were changed from 8:50 a.m. in study year 0, to 10 a...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29260917/how-have-our-clocks-evolved-adaptive-and-demographic-history-of-the-out-of-african-dispersal-told-by-polymorphic-loci-in-circadian-genes
#8
Arcady A Putilov, Vladimir B Dorokhov, Michael G Poluektov
The mechanism of the molecular circadian clocks is currently understood as a transcription/translation feedback loop involving more than ten genes. Genetic variation at some of loci in these genes has been shaped by adaptation to environmental factors. In particular, latitudinal clines in allele frequency were documented in several animal species, but the contradictory conclusions were drawn from the results of rare human studies. Here we tested whether the out-of-African dispersal of human populations to higher latitudes of the Eurasian continent was associated with latitude-dependent shifts in allele frequency at polymorphic loci in genes of three (reference, circadian and skin pigmentation) groups...
December 20, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29260906/gender-differences-in-sleep-habits-and-quality-and-daytime-sleepiness-in-elementary-and-high-school-teachers
#9
Jane Carla de Souza, Maria Luiza Cruz de Oliveira, Ivanise Cortez de Sousa, Carolina V M de Azevedo
The extensive workload of teachers inside and outside the classroom may contribute to sleep problems. Such problems may occur more frequently in women due to the combination of professional demands, domestic tasks, and their relatively greater sleep needs compared to men. The objective of this cross-sectional study was to evaluate the influence of gender on sleep habits and quality, and daytime sleepiness in a sample of 243 teachers (77 men and 166 women) using questionnaires. Linear regression models were used to examine the effect of gender on sleep measures; the unadjusted model considered only gender and the adjusted model considered chronotype and work characteristics as potential confounders...
December 20, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29239697/who-is-sleepier-on-the-night-shift-the-influence-of-bio-psycho-social-factors-on-subjective-sleepiness-of-female-nurses-during-the-night-shift
#10
Nataly Zion, Anat Drach-Zahavy, Tamar Shochat
Sleepiness is a common complaint during the night shift and may impair performance. The current study aimed to identify bio-psycho-social factors associated with subjective sleepiness during the night shift. Ninety-two female nurses working rotating shifts completed a sociodemographic questionnaire, the Munich ChronoType Questionaire for shift workers, the Pittsburg Sleep Quality Index and the Pre-sleep Arousal Scale. Subjective sleepiness was measured hourly during two night shifts using the Karolinska Sleepiness Scale, and activity monitors assessed sleep duration 24-hours before each shift...
December 14, 2017: Ergonomics
https://www.readbyqxmd.com/read/29237053/beyond-sleep-duration-bidirectional-associations-between-chronotype-social-jetlag-and-drinking-behaviors-in-a-longitudinal-sample-of-us-high-school-students
#11
Denise L Haynie, Daniel Lewin, Jeremy W Luk, Leah M Lipsky, Fearghal O'Brien, Ronald J Iannotti, Danping Liu, Bruce G Simons-Morton
Health Behavior in School-Aged Children: NEXT Longitudinal Study 2009-2013, https://clinicaltrials.gov/ct2/show/NCT01031160?term=Simons-Morton&rank=3, NCT01031160.
December 9, 2017: Sleep
https://www.readbyqxmd.com/read/29231764/relevance-of-chronotype-for-eating-patterns-in-adolescents
#12
Sarah Roßbach, Tanja Diederichs, Ute Nöthlings, Anette E Buyken, Ute Alexy
During adolescence, a shift from morningness to eveningness occurs, yet school continues to start early in the morning. Hence, adolescents are at risk for social jetlag, i.e. a discrepancy between biological and social timing. It remains to be determined whether chronotype associates with daily and daytime-specific eating patterns during this potentially critical period. Therefore, the aim of the present study was to investigate whether chronotype is decisive for daily eating patterns [total energy intake (TEI, kcal), total macronutrient intake (% of TEI), eating occasion frequency (n/day), meal frequency (n/day), snack frequency (n/day), duration of nightly fasting], or daytime-specific eating patterns [morning (before 11 am) energy intake (% of TEI), morning macronutrient intake (% of morning energy intake), regular breakfast skipping (no morning energy intake at least on 2 of 3 days, yes/no), evening (after 6 pm) energy intake (% of TEI), evening macronutrient intake (% of evening energy intake), regular dinner skipping (no evening energy intake at least on 2 of 3 days, yes/no)] in German adolescents...
December 12, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29231749/individual-differences-in-chronotypes-associated-with-academic-performance-among-chilean-university-students
#13
Macarena Valladares, Rodrigo Ramírez-Tagle, Miss Alexandra Muñoz, Ana María Obregón
A chronotype is an individual trait that determines circadian rhythm (dark/light cycle) characteristics, associated with bedtime, waking, and other daily activities. A chronotype is classified as morning, intermediate, and evening. The objective is to associate chronotypes with academic performance in university students. A cross-sectional study was performed to evaluate the chronotype of university students (n = 703) by Horne-Ostberg questionnaire and associated with academic performance. The group with higher GPAs had higher chronotype scores (p = 0...
December 12, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29231745/persistence-of-social-jetlag-and-sleep-disruption-in-healthy-young-adults
#14
Daria M McMahon, James B Burch, Michael D Wirth, Shawn D Youngstedt, James W Hardin, Thomas G Hurley, Steven N Blair, Gregory A Hand, Robin P Shook, Clemens Drenowatz, Stephanie Burgess, James R Hebert
Sleep disruption has been associated with increased risks for several major chronic diseases that develop over decades. Differences in sleep/wake timing between work and free days can result in the development of social jetlag (SJL), a chronic misalignment between a person's preferred sleep/wake schedule and sleep/wake timing imposed by his/her work schedule. Only a few studies have examined the persistence of SJL or sleep disruption over time. This prospective investigation examined SJL and sleep characteristics over a 2-year period to evaluate whether SJL or poor sleep were chronic conditions during the study period...
December 12, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29221785/attention-deficit-hyperactivity-disorder-symptom-severity-and-sleep-problems-in-adult-participants-of-the-netherlands-sleep-registry
#15
Suzan W N Vogel, Denise Bijlenga, Jeroen S Benjamins, Aartjan T F Beekman, J J Sandra Kooij, Eus J W Van Someren
BACKGROUND: We examined whether current overall attention deficit hyperactivity disorder (ADHD), inattention, or hyperactivity symptom severities are associated with the current presence and persistent history of sleep problems. METHODS: N = 942 participants of the Netherlands Sleep Registry filled out online several validated questionnaires. Regression analyses were performed to assess the association between (1) current overall ADHD symptom severity and the current presence of sleep problems, (2) current ADHD symptom-severity groups and the persistent history of sleep problems, and (3) current inattention or hyperactivity symptom severities and the current presence of sleep problems...
December 2017: Sleep Medicine
https://www.readbyqxmd.com/read/29221776/sleep-characteristics-associated-with-drowsy-driving
#16
Jun-Sang Sunwoo, Young Hwangbo, Won-Joo Kim, Min Kyung Chu, Chang-Ho Yun, Kwang Ik Yang
OBJECTIVE: The aim of this study was to evaluate sleep characteristics associated with drowsy driving in an adult population. METHODS: The study subjects consisted of 1675 adults aged 19 years or older who completed a population-based questionnaire survey on sleep habits. Experiences of drowsy driving were obtained from self-reported data. We investigated sleep-related variables including sleep duration, sleep efficiency, chronotype, subjective sleep perception, daytime sleepiness, sleep quality, and snoring...
December 2017: Sleep Medicine
https://www.readbyqxmd.com/read/29219626/eveningness-is-associated-with-skipping-breakfast-and-poor-nutritional-intake-in-brazilian-undergraduate-students
#17
Gabriela Pereira Teixeira, Maria Carliana Mota, Cibele Aparecida Crispim
Some studies have proposed that self-reported eveningness, which reflects the preference of performing activities in the evening, may harm nutritional health and influence the eating behavior and nutritional status of individuals. However, the relationship between these variables (eveningness and nutritional status) and the consumption of breakfast, which is currently considered a marker of health, has been insufficiently explored by studies. The aim of this study was to investigate, in undergraduate students, the association between diurnal preference, being overweight, and food consumption (with special focus on breakfast)...
December 8, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29179142/the-relationship-of-person-specific-eveningness-chronotype-greater-seasonality-and-less-rhythmicity-to-suicidal-behavior-a-literature-review
#18
REVIEW
Meredith E Rumble, Daniel Dickson, W Vaughn McCall, Andrew D Krystal, Doug Case, Peter B Rosenquist, Ruth M Benca
BACKGROUND: Epidemiological data have demonstrated seasonal and circadian patterns of suicidal deaths. Several reviews and meta-analyses have confirmed the relationship between sleep disturbance and suicidality. However, these reviews/meta-analyses have not focused on seasonal and circadian dysfunction in relation to suicidality, despite the common presence of this dysfunction in patients with mood disorders. Thus, the current literature review analyzed studies investigating person-specific chronotype, seasonality, and rhythmicity in relation to suicidal thoughts and behaviors...
November 14, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/29157641/a-process-oriented-model-linking-adolescents-sleep-hygiene-and-psychological-functioning-the-moderating-role-of-school-start-times
#19
Jack S Peltz, Ronald D Rogge, Heidi Connolly, Thomas G O'Connor
OBJECTIVE: To examine a mediational model linking sleep hygiene to better mental health in adolescents via the mechanism of improved sleep quality, and to test the moderating role of school start times (SST) (before 8:30 AM vs. 8:30 AM or later) on that mediation model. DESIGN: Cross-sectional. SETTING: Online survey for high school students across the United States. PARTICIPANTS: A total of 197 adolescents aged 14-17 years old (Mage = 15...
December 2017: Sleep Health
https://www.readbyqxmd.com/read/29157006/chronotype-description-in-search-of-a-solid-subjective-amplitude-scale
#20
Halszka Oginska, Justyna Mojsa-Kaja, Olivier Mairesse
The term "subjective circadian amplitude" refers to the range or the distinctness of diurnal variations of arousal, that is, the awareness (or lack thereof) of difference between hyper- and hypo-activation phases, the ability to volitionally modulate one's own psychophysiological state, the strength of morning-evening preferences and flexibility of the rhythm or perceived stability of the circadian phase. The complexity of this construct is the source of difficulties in research and measurement. The psychometric features of distinctness subscales of the Chronotype Questionnaire and the Caen Chronotype Questionnaire are not satisfactory...
November 20, 2017: Chronobiology International
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