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https://www.readbyqxmd.com/read/29144173/chronotype-regulates-the-neural-basis-of-response-inhibition-during-the-daytime
#1
Jingjing Song, Pan Feng, Xiaoyue Zhao, Wenjian Xu, Lijuan Xiao, Jia Zhou, Yong Zheng
Studies have elucidated the various modulatory effects of chronotype and time-of-day on task-dependent brain activity, but it is unclear how chronotype and time-of-day regulate brain activity in response inhibition tasks. To address this question, we used functional magnetic resonance imaging (fMRI) to explore the effects of chronotype and time-of-day on response inhibition in normal day-night conditions. Morning-type (MT) and evening-type (ET) participants conducted the stop-signal task in morning (08:00-12:00 hours) and evening (19:00-23:00 hours) sessions...
November 16, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29111789/evening-chronotype-and-sleepiness-predict-impairment-in-executive-abilities-and-academic-performance-of-adolescents
#2
Mairav Cohen-Zion, Elisheva Shiloh
The study aim was to better understand sleep and sleep-related factors affecting everyday executive capacities and academic performance among healthy adolescents. A cross-sectional survey on sleep, phase preference, academic performance and executive functions of high-school students was conducted. Female gender, grade status, sleepiness and evening chronotype accounted for approximately 25-30% of the variance in daily executive ability. Sleep duration was a weak predictor of executive skills. Lower school grades were associated with increased sleepiness, evening preference and poorer executive skills...
November 7, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29111775/social-jetlag-and-depression-status-results-obtained-from-the-netherlands-study-of-depression-and-anxiety
#3
Stefan E Knapen, Rixt F Riemersma-van der Lek, Niki Antypa, Ybe Meesters, Brenda W J H Penninx, Robert A Schoevers
Social jetlag, the misalignment between the internal clock and the socially required timing of activities, is highly prevalent, especially in people with an evening chronotype and is hypothesized to be related to the link between the evening chronotype and major depressive disorder. Although social jetlag has been linked to depressive symptoms in non-clinical samples, it has never been studied in patients with major depressive disorder (MDD). This study is aimed to study social jetlag in patients with major depressive disorder and healthy controls, and to further examine the link between social jetlag and depressive symptomatology...
November 7, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29111446/high-and-low-use-of-electronic-media-during-nighttime-before-going-to-sleep-a-comparative-study-between-adolescents-attending-a-morning-or-afternoon-school-shift
#4
Arturo Arrona-Palacios
This study compared the effects of time spent on electronic media devices during nighttime before going to sleep on the sleep-wake cycle, daytime sleepiness, and chronotype in 568 Mexican students (288 girls, mean age = 14.08) attending a double school shift system (287 from morning shift and 281 from afternoon shift). Students completed anonymous self-report questionnaires. Results suggest that high exposure to an electronic media device may have an impact on their sleep-wake cycle, regardless of their school shift...
October 28, 2017: Journal of Adolescence
https://www.readbyqxmd.com/read/29106308/sleep-quality-and-methylation-status-of-core-circadian-rhythm-genes-among-nurses-and-midwives
#5
Agnieszka Bukowska-Damska, Edyta Reszka, Pawel Kaluzny, Edyta Wieczorek, Monika Przybek, Shanbeh Zienolddiny, Beata Peplonska
ABSTARCT Poor sleep quality or sleep restriction is associated with sleepiness and concentration problems. Moreover, chronic sleep restriction may affect metabolism, hormone secretion patterns and inflammatory responses. Limited recent reports suggest a potential link between sleep deprivation and epigenetic effects such as changes in DNA methylation profiles. The aim of the present study was to assess the potential association between poor sleep quality or sleep duration and the levels of 5-methylcytosine in the promoter regions of PER1, PER2, PER3, BMAL1, CLOCK, CRY1 CRY2 and NPAS2 genes, taking into account rotating night work and chronotype as potential confounders or modifiers...
November 6, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29098917/sleep-pattern-and-decision-making-in-physicians-from-mobile-emergency-care-service-with-12-hour-work-schedules
#6
Eleni de Araújo Sales Castro, Katie Moraes de Almondes
INTRODUCTION: Shift work schedules are biological standpoint worse because compel the body to anticipate periods of wakefulness and sleep and thus eventually cause a disruption of biological rhythms. OBJECTIVE: To evaluate the sleep pattern and decision making in physicians working in mobile units of emergency attention undergoing Day Shift and Rotating Shift. METHODS: The study included 26 physicians. The instruments utilized were a sociodemographic questionnaire, the Pittsburgh Sleep Quality Index (PSQI), the Sleep Habits Questionnaire, the Epworth Sleepiness Scale and Chronotype Identification Questionnaire of Horne-Ostberg, the Iowa Gambling Task (IGT) and hypothetical scenarios of decision-making created according to the Policy-Capturing Technique...
November 3, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/29066053/insomnia-heterogeneity-characteristics-to-consider-for-data-driven-multivariate-subtyping
#7
REVIEW
Jeroen S Benjamins, Filippo Migliorati, Kim Dekker, Rick Wassing, Sarah Moens, Tessa F Blanken, Bart H W Te Lindert, Jeffrey Sjauw Mook, Eus J W Van Someren
Meta-analyses and systematic reviews have reported surprisingly few consistent insomnia-characteristics with respect to cognitions, mood, traits, history of life events and family history. One interpretation of this limited consistency is that different subtypes of insomnia exist, each with its own specific multivariate profile of characteristics. Because previously unrecognized subtypes will be differentially represented in individual studies and dilute effect sizes of subtype-dependent characteristics of importance, they are unlikely to be reported consistently in individual studies, let alone in meta-analyses...
November 9, 2016: Sleep Medicine Reviews
https://www.readbyqxmd.com/read/29064299/multilevel-modeling-of-chronotype-and-weekdays-versus-weekends-to-predict-nonrestorative-sleep
#8
Joshua Tutek, Hylton E Molzof, Kenneth L Lichstein
Nonrestorative sleep, a form of subjective sleep disturbance that has been largely neglected in the literature, is newly accessible to researchers via the validated restorative sleep questionnaire (RSQ). The daily version of the RSQ allows for analysis of within-subjects variation in restorative sleep across repeated samplings, and such day-to-day regularity in sleep variables has been highlighted as an important new direction for research. The present study used a sophisticated statistical approach, multilevel modeling, to examine the contributions of circadian chronotype, calendar day of questionnaire completion (weekends versus weekdays), and their interaction in explaining both interindividual and intraindividual variance in restorative sleep...
October 24, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29061417/bipolar-disorder-in-asia-illness-course-and-contributing-factors
#9
REVIEW
Karthick Subramanian, Siddharth Sarkar, Shivanand Kattimani
BACKGROUND: Epidemiological studies analysing the course of Bipolar Disorder (BD) are relatively rare in the Asian context, contributing to the uncertainty regarding the prevalent course patterns and factors influencing such patterns. The current review identifies the regional characteristics of BD course patterns and the associated factors. METHODS: A review of the existing literature was done using 'PubMed' and 'Cochrane' databases which yielded 145 studies including those from all 48 Asian countries...
October 2017: Asian Journal of Psychiatry
https://www.readbyqxmd.com/read/29050555/natural-variation-in-human-clocks
#10
Malcolm von Schantz
Our own species has a diurnal activity pattern and an average circadian period of 24.2h. Exact determination of circadian period requires expensive and intrusive protocols, and investigators are therefore using chronotype questionnaires as a proxy quantitative measure. Both measures show a normal distribution suggestive of a polygenic trait. The genetic components of the 24-h feedback loop that generates circadian rhythms within our cells have been mapped in detail, identifying a number of candidate genes which have been investigated for genetic polymorphisms relating to the phenotypic variance...
2017: Advances in Genetics
https://www.readbyqxmd.com/read/29040275/nocturnal-sleep-mediates-the-relationship-between-morningness-eveningness-preference-and-the-sleep-architecture-of-afternoon-naps-in-university-students
#11
Tzu-Yin Lee, Pi-Chen Chang, Ing-Jy Tseng, Min-Huey Chung
The present study investigated the parameters of nocturnal sleep that mediate the relationship between morningness-eveningness preference and the sleep architecture of naps in university students. This study had a cross-sectional, descriptive correlational design. The sleep architecture of 52 students invited to take an afternoon nap in the laboratory was recorded. The morningness-eveningness questionnaire (MEQ) was used to evaluate morningness-eveningness preference. An actigraph was used to collect students' nighttime sleep data in the week preceding the study...
2017: PloS One
https://www.readbyqxmd.com/read/29031762/sleep-and-cognitive-performance-cross-sectional-associations-in%C3%A2-the%C3%A2-uk-biobank
#12
Simon D Kyle, Claire E Sexton, Bernd Feige, Annemarie I Luik, Jacqueline Lane, Richa Saxena, Simon G Anderson, David A Bechtold, William Dixon, Max A Little, David Ray, Dieter Riemann, Colin A Espie, Martin K Rutter, Kai Spiegelhalder
OBJECTIVE: The relationship between insomnia symptoms and cognitive performance is unclear, particularly at the population level. We conducted the largest examination of this association to date through analysis of the UK Biobank, a large population-based sample of adults aged 40-69 years. We also sought to determine associations between cognitive performance and self-reported chronotype, sleep medication use and sleep duration. METHODS: This cross-sectional, population-based study involved 477,529 participants, comprising 133,314 patients with frequent insomnia symptoms (age: 57...
October 2017: Sleep Medicine
https://www.readbyqxmd.com/read/29031757/what-predicts-inattention-in-adolescents-an-experience-sampling-study-comparing-chronotype-subjective-and-objective-sleep-parameters
#13
Timo Hennig, Katarina Krkovic, Tania M Lincoln
OBJECTIVE: Many adolescents sleep insufficiently, which may negatively affect their functioning during the day. To improve sleep interventions, we need a better understanding of the specific sleep-related parameters that predict poor functioning. We investigated to which extent subjective and objective parameters of sleep in the preceding night (state parameters) and the trait variable chronotype predict daytime inattention as an indicator of poor functioning. METHODS: We conducted an experience-sampling study over one week with 61 adolescents (30 girls, 31 boys; mean age = 15...
October 2017: Sleep Medicine
https://www.readbyqxmd.com/read/29024857/controlled-trial-evaluation-of-exposure-duration-to-negative-air-ions-for-the-treatment-of-seasonal-affective-disorder
#14
Bonnie Bowers, Randall Flory, Joseph Ametepe, Lauren Staley, Anne Patrick, Heather Carrington
This study evaluated the effectiveness of 30 or 60min of daily exposure to high-density or to zero-density (placebo condition) negative air ions over 18 days on the symptoms of seasonal affective disorder (SAD) in 40 participants under controlled laboratory conditions. Exposure to high-density negative air ions was superior to zero-density negative air ions in alleviating depression and the atypical symptoms of SAD. Also, more subjects in the high-density negative air ions groups met two different clinical response criteria than did those in the zero-density groups...
August 19, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28994246/time-to-learn-how-chronotype-impacts-education
#15
REVIEW
Giulia Zerbini, Martha Merrow
A growing body of literature has linked chronotype and sleep to school performance. Chronotype is under the control of the circadian clock and refers to sleep timing and diurnal preferences. Chronotype changes with age and is latest during adolescence, giving rise to a mismatch between the (late) circadian clock and the (early) school clock. In general, evening (late) chronotypes obtain lower grades. School performance is influenced by many other factors, such as motivation, intelligence, and conscientiousness...
October 10, 2017: PsyCh Journal
https://www.readbyqxmd.com/read/28994211/sleep-duration-is-associated-with-sperm-chromatin-integrity-among-young-men-in-chongqing-china
#16
Xiaogang Wang, Qing Chen, Peng Zou, Taixiu Liu, Min Mo, Huan Yang, Niya Zhou, Lei Sun, Hongqiang Chen, Xi Ling, Kaige Peng, Lin Ao, Huifang Yang, Jia Cao, Zhihong Cui
This study explores whether sleep duration is associated with sperm chromatin integrity. To do so, we conducted a three-phase panel study of 796 male volunteers from colleges in Chongqing (China) from 2013 to 2015. Sleep duration was measured using a modified Munich Chronotype Questionnaire. Sperm DNA integrity was examined via Sperm Chromatin Structure Assay and Comet assay. Setting 7-7.5 h day(-1) of sleep duration as a reference, either longer or shorter sleep duration was associated negatively with high DNA stainability (HDS) (P = 0...
October 9, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28993490/two-sides-of-a-coin-ecological-and-chronobiological-perspectives-of-timing-in-the-wild
#17
REVIEW
Barbara Helm, Marcel E Visser, William Schwartz, Noga Kronfeld-Schor, Menno Gerkema, Theunis Piersma, Guy Bloch
Most processes within organisms, and most interactions between organisms and their environment, have distinct time profiles. The temporal coordination of such processes is crucial across levels of biological organization, but disciplines differ widely in their approaches to study timing. Such differences are accentuated between ecologists, who are centrally concerned with a holistic view of an organism in relation to its external environment, and chronobiologists, who emphasize internal timekeeping within an organism and the mechanisms of its adjustment to the environment...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28977221/chronotype-and-work-shift-in-nursing-workers-of-university-hospitals
#18
Rosângela Marion da Silva, Regina Célia Gollner Zeitoune, Carmem Lúcia Colomé Beck, Milva Maria Figueiredo de Martino, Francine Cassol Prestes, Marli Maria Loro
Objective: To identify the predominant chronotype in nursing workers who work in surgical clinics of university hospitals and to verify the association with work shift. Method: Cross-sectional study, performed in surgical clinics of university hospitals in the Southern region of Brazil. The sample of 270 nursing workers answered questions of socio-occupational characterization, of health and the Morningness-Eveningness Questionnaire of Horne and Östberg. We performed a descriptive and bivariate analysis with the help of the SPSS software and confidence interval of 95%...
September 2017: Revista Brasileira de Enfermagem
https://www.readbyqxmd.com/read/28944680/chronotypes-and-circadian-timing-in-migraine
#19
Wpj van Oosterhout, Ejw van Someren, G G Schoonman, M A Louter, G J Lammers, M D Ferrari, G M Terwindt
Background It has been suggested that migraine attacks strike according to circadian patterns and that this might be related to individual chronotype. Here we evaluated and correlated individual chronotypes, stability of the circadian rhythm, and circadian attack timing in a large and well-characterised migraine population. Methods In 2875 migraine patients and 200 non-headache controls we assessed differences in: (i) distribution of chronotypes (Münich Chronotype Questionnaire); (ii) the circadian rhythm's amplitude and stability (Circadian Type Inventory); and (iii) circadian timing of migraine attacks...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/28912014/acute-alerting-effects-of-light-a-systematic-literature-review
#20
REVIEW
Jan L Souman, Angelica M Tinga, Susan F Te Pas, Raymond van Ee, Björn N S Vlaskamp
Periodic, well timed exposure to light is important for our health and wellbeing. Light, in particular in the blue part of the spectrum, is thought to affect alertness both indirectly, by modifying circadian rhythms, and directly, giving rise to acute effects. We performed a systematic review of empirical studies on direct, acute effects of light on alertness to evaluate the reliability of these effects. In total, we identified 68 studies in which either light intensity, spectral distribution, or both were manipulated, and evaluated the effects on behavioral measures of alertness, either subjectively or measured in reaction time performance tasks...
January 30, 2018: Behavioural Brain Research
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