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https://www.readbyqxmd.com/read/28722202/medical-residents-circadian-preferences-across-specialties
#1
Anthony L Chin-Quee, Kathleen Yaremchuk
OBJECTIVE: Circadian preference refers to the tendency of individuals to be more alert and effective in the morning (larks) or the evening (owls). Given the rigors of medical residency training and perceived lifestyle differences among specialties, circadian preference may play a role in choice of medical specialty and subsequent job satisfaction during training. This study aimed to determine the circadian preferences of residents across specialties and correlations with specialty choice and job satisfaction...
July 19, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28715917/self-reported-discomfort-associated-with-daylight-saving-time-in-brazilian-tropical-and-subtropical-zones
#2
João Carlos Nascimento de Alencar, Mario André Leocardio-Miguel, Leandro Lourenção Duarte, Fernando Louzada, John Fontenele Araujo, Mario Pedrazzoli
BACKGROUND: Daylight Saving Time (DST) annually moves clocks one hour forward, when daytime is longer than night. Previous studies from medium and high latitude locations have pointed to a disruptive effect of DST on human circadian rhythms. Since Brazil is an equatorial country implementing DST, a different relationship between photic and social synchronizers may interfere with DST effects. AIM: To explore the prevalence and duration of self-reported discomfort related to DST among Brazilian residents (lat...
July 17, 2017: Annals of Human Biology
https://www.readbyqxmd.com/read/28710358/latitudinal-cline-of-chronotype
#3
Mario André Leocadio-Miguel, Fernando Mazzili Louzada, Leandro Lourenção Duarte, Roberta Peixoto Areas, Marilene Alam, Marcelo Ventura Freire, John Fontenele-Araujo, Luiz Menna-Barreto, Mario Pedrazzoli
The rotation of the Earth around its own axis and around the sun determines the characteristics of the light/dark cycle, the most stable and ancient 24 h temporal cue for all organisms. Due to the tilt in the earth's axis in relation to the plane of the earth's orbit around the sun, sunlight reaches the Earth differentially depending on the latitude. The timing of circadian rhythms varies among individuals of a given population and biological and environmental factors underlie this variability. In the present study, we tested the hypothesis that latitude is associated to the regulation of circadian rhythm in humans...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28708003/arntl-clock-and-per3-polymorphisms-links-with-chronotype-and-affective-dimensions
#4
Konrad S Jankowski, Monika Dmitrzak-Weglarz
Recently, seven single nucleotide polymorphisms (SNPs) of ARNTL, TIM and PER3 genes were found associated with affective temperaments in bipolar disorder patients. This study aimed to test whether a) the same associations appear in a non-clinical sample; b) the SNPs are related to other affective dimensions; c) the SNPs underpin the associations between chronotype and affective temperaments/dimensions. Three hundred thirty-eight university students completed the Temperament Scale of Memphis, Pisa, Paris and San Diego Auto-questionnaire, the Centre for Epidemiological Studies Depression Scale, the Perceived Stress Scale, the General Health Questionnaire, the Seasonal Pattern Assessment Questionnaire and the Composite Scale of Morningness...
July 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28707304/actigraph-measures-of-sleep-among-female-hospital-employees-working-day-or-alternating-day-and-night-shifts
#5
Jill Korsiak, Joan Tranmer, Michael Leung, Michael M Borghese, Kristan J Aronson
Sleep disturbance is common among shift workers, and may be an important factor in the effect of shift work on chronic disease development. In this cross-sectional study, we described sleep patterns of 294 female hospital workers (142 alternating day-night shift workers, 152 day workers) and determined associations between shift work and sleep duration. Rest-activity cycles were recorded with the ActiGraph GT3X+ for 1 week. Analyses were stratified by chronotype of shift workers. Using all study days to calculate average sleep duration, shift workers slept approximately 13 min less than day workers during main sleep periods, while 24-h sleep duration did not differ between day workers and shift workers...
July 14, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28701566/chronotype-variation-drives-night-time-sentinel-like-behaviour-in-hunter-gatherers
#6
David R Samson, Alyssa N Crittenden, Ibrahim A Mabulla, Audax Z P Mabulla, Charles L Nunn
Sleep is essential for survival, yet it also represents a time of extreme vulnerability to predation, hostile conspecifics and environmental dangers. To reduce the risks of sleeping, the sentinel hypothesis proposes that group-living animals share the task of vigilance during sleep, with some individuals sleeping while others are awake. To investigate sentinel-like behaviour in sleeping humans, we investigated activity patterns at night among Hadza hunter-gatherers of Tanzania. Using actigraphy, we discovered that all subjects were simultaneously scored as asleep for only 18 min in total over 20 days of observation, with a median of eight individuals awake throughout the night-time period; thus, one or more individuals was awake (or in light stages of sleep) during 99...
July 12, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28689312/sleep-chronotype-and-sleep-hygiene-in-children-with-attention-deficit-hyperactivity-disorder-autism-spectrum-disorder-and-controls
#7
K B van der Heijden, R J Stoffelsen, A Popma, H Swaab
Sleep problems are highly prevalent in ADHD and autism spectrum disorder (ASD). Better insight in the etiology is of clinical importance since intervention and prevention strategies of sleep problems are directed at underlying mechanisms. We evaluated the association of sleep problems and sleep patterns with sleep hygiene (behavioral/environmental practices that influence sleep quality, e.g. caffeine use), access to electronic media, chronotype, and anxiety/depression in children aged 6-12 years with ADHD, ASD, or typical development (TD) using parental questionnaires...
July 8, 2017: European Child & Adolescent Psychiatry
https://www.readbyqxmd.com/read/28663569/lower-school-performance-in-late-chronotypes-underlying-factors-and-mechanisms
#8
Giulia Zerbini, Vincent van der Vinne, Lana K M Otto, Thomas Kantermann, Wim P Krijnen, Till Roenneberg, Martha Merrow
Success at school determines future career opportunities. We described a time-of-day specific disparity in school performance between early and late chronotypes. Several studies showed that students with a late chronotype and short sleep duration obtain lower grades, suggesting that early school starting times handicap their performance. How chronotype, sleep duration, and time of day impact school performance is not clear. At a Dutch high school, we collected 40,890 grades obtained in a variety of school subjects over an entire school year...
June 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28646790/the-effects-of-individual-biological-rhythm-differences-on-sleep-quality-daytime-sleepiness-and-dissociative-experiences
#9
Yavuz Selvi, Ali Kandeger, Murat Boysan, Nursel Akbaba, Ayca A Sayin, Emine Tekinarslan, Basak O Koc, Omer F Uygur, Vedat Sar
Individuals who differ markedly by sleep chronotype, i.e., morning-type or evening-type also differ on a number of psychological, behavioral, and biological variables. Among several other psychological functions, dissociation may also lead to disruption and alteration of consciousness, which may facilitate dream-like experiences. Our study was aimed at an inquiry into the effects of individual biological rhythm differences on sleep quality and daytime sleepiness in conjunction with dissociative experiences...
June 17, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28636610/chronotypes-in-the-us-influence-of-age-and-sex
#10
Dorothee Fischer, David A Lombardi, Helen Marucci-Wellman, Till Roenneberg
An individual's chronotype reflects how the circadian system embeds itself into the 24-h day with rhythms in physiology, cognition and behavior occurring accordingly earlier or later. In view of an increasing number of people working at unusual times and linked health and safety risks, the wide range in human chronotypes may provide opportunities to allow people to work (and sleep) at times that are in synch with their circadian physiology. We aimed at estimating the distribution of chronotypes in the US population by age and sex...
2017: PloS One
https://www.readbyqxmd.com/read/28630583/acute-modification-of-cardiac-autonomic-function-of-high-intensity-interval-training-in-collegiate-male-soccer-players-with-different-chronotype-a-cross-over-study
#11
Matteo Bonato, Luca Agnello, Letizia Galasso, Angela Montaruli, Eliana Roveda, Giampiero Merati, Antonio La Torre, Jacopo A Vitale
The purpose of this study was to evaluate if the time of the day (8.00 a.m. vs 8.00 p.m.) and chronotype could influence autonomic cardiac control in soccer players in relation to an acute session of high-intensity interval training. The morningness-eveningness questionnaire was administered to recruit Morning-type and Evening-type collegiate male soccer players. Therefore, 24 players (12 Morning-types and 12 Evening-types) were randomly assigned, to either morning (n = 12; age 23 ± 3 years; height 1.75 ± 0...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28627300/reduced-effective-emotion-regulation-in-night-owls
#12
Alexandra L Watts, Ray Norbury
Previous research has demonstrated a clear link between late chronotype and depression. The vulnerability factors underpinning this link, however, are unclear. Here the relationship between two specific emotion regulation strategies, cognitive reappraisal and expressive suppression, and chronotype was investigated using multiple regression. Two hundred and forty participants (age range 18-80, 189 females) completed validated self-report questionnaires assaying chronotype, neuroticism, depressive symptomatology, sleep quality, and emotion regulation...
June 1, 2017: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/28613957/chronotype-preference-matters-for-depression-in-youth
#13
Wen-Hsuan Chiu, Hao-Jan Yang, Po-Hsiu Kuo
Morningness/eveningness (M/E) preference is an important circadian rhythm indicator with strong individual variation. M/E chronotype has been found to be correlated with depression in adults, yet the relationship is less clear in children and adolescents. Additionally, poor sleep quality is another commonly studied risk factor for depression. The aims of the present study are to investigate the independent effects of M/E chronotype on youth depression using both self-report and parental-report questionnaires...
June 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28594245/chronotype-correlates-with-developmental-index-intelligence-and-academic-achievement-a-study-based-on-nationwide-indicators
#14
Christoph Randler
Chronotype or morningness-eveningness (M/E) is an individual trait with a biological basis. In this study, I analysed the relationship between M/E and nationwide available data, such as economic variables, school achievement, intelligence and conscientiousness, which is a personality trait. These variables have been chosen because, first, they are linked on the individual level with circadian preference, and, second these associations have been found based on meta-analyses, which gives these findings a high plausibility...
June 8, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28574288/chronotype-and-its-relationship-with-sleep-disorders-in-children-with-attention-deficit-hyperactivity-disorder
#15
Fatma Benk Durmuş, Ayşe Rodopman Arman, Ayşe Burcu Ayaz
Chronotype can be classified as morningness types, people who prefer morning hours for their physical and mental activities; eveningness types, people who prefer the afternoon or evening hours; and intermediate types, those who show characteristics of both morningness and eveningness types. Attention deficit hyperactivity disorder (ADHD) has been linked with disturbances in chronotype, particularly increased eveningness. Despite the possibility of an association between chronotypes, sleep disturbances and ADHD symptoms, there is little evidence of this association considering the child population...
June 2, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28547821/effects-of-sleep-on-substance-use-in-adolescents-a-longitudinal-perspective
#16
Tam T Nguyen-Louie, Ty Brumback, Matthew J Worley, Ian M Colrain, Georg E Matt, Lindsay M Squeglia, Susan F Tapert
Substance use (SU) and sleep problems appear interrelated, but few studies have examined the influence of adolescent sleep patterns on development of SU disorders. This study prospectively examined the influence of sleep habits on subsequent SU in youth who later transitioned into heavy drinking. At time 1 (T1), participants (n = 95) were substance-naive 12- to 14-year-olds. Path-analytic models examined whether the effects of T1 risk factors (familial SU disorder, inhibition control, and externalizing and internalizing traits) on time 3 (M = 19...
May 26, 2017: Addiction Biology
https://www.readbyqxmd.com/read/28543321/conscientiousness-but-not-agreeableness-mediates-females-tendency-toward-being-a-morning-person
#17
Arash Rahafar, Ina Castellana, Christoph Randler, Juan Manuel Antúnez
Individuals differ in their chronotype, and some are identified as morning ones and others as evening ones. Earlier studies showed that women were higher on morningness, conscientiousness, and agreeableness. In this study, we aimed at exploring the mediational effects of conscientiousness and agreeableness in the relationship of gender and morningness-eveningness. Participants were 669 university students. Results supported positive relationships between morningness and conscientiousness and agreeableness and between conscientiousness and agreeableness...
June 2017: Scandinavian Journal of Psychology
https://www.readbyqxmd.com/read/28537801/association-of-chronotype-and-social-jetlag-with-human-non-verbal-intelligence
#18
A S Panev, T A Tserne, A S Polugrudov, L A Bakutova, N B Petrova, O V Tatarinova, O N Kolosova, M F Borisenkov
The aim of this study was to evaluate the effects of chronotype and social jetlag (SJL) on intelligence. Subjects were aged 14-25 years (n = 1008). A significant effect of intelligence on academic performance, as measured by the Raven's Standard Progressive Matrices test, was found (F2,917 = 11.75, P < 0.0001, η(2) = 0.03). When SJL was less than 2 hours, the intelligence of people with late chronotype was found to be higher than that of subjects with early and intermediate chronotypes (F2,305 = 3.12, P < 0...
May 24, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28525634/association-between-weekend-catch-up-sleep-and-lower-body-mass-population-based-study
#19
Hee-Jin Im, Shin-Hye Baek, Min Kyung Chu, Kwang Ik Yang, Won-Joo Kim, Seong-Ho Park, Robert J Thomas, Chang-Ho Yun
Study Objectives: To determine if weekend catch-up sleep (CUS) impacts body mass index (BMI) in the general population. Methods: A stratified random sample (2,156 subjects; age 19-82 years old, 43.0±14.5; 1,183 male) from the general population was evaluated, in 2010, using face-to-face interviews about sociodemographic characteristics, height, weight, habitual sleep duration and time-in-bed at night on weekdays and weekend, sleep-related profiles, mood and anxiety scales, and comorbid-medical conditions...
May 19, 2017: Sleep
https://www.readbyqxmd.com/read/28523961/chronotype-and-response-to-training-during-the-polar-night-a-pilot-study
#20
Jacopo Antonino Vitale, Eva Bjoerkesett, Andrea Campana, Giacomo Panizza, Andi Weydahl
BACKGROUND: An individual's chronotype influences his or her physiological rhythms. Some studies have looked at the effect of time of day on the responses to exercise, but studies on the effect of long-term training are lacking. OBJECTIVE:  To report the effects of an 8-week training period during the polar night in non-athletes of different chronotypes living at 70°N. DESIGN:  In all, 10 morning (M), 10 neither (N) and 10 evening (E) types were recruited, and their aerobic capacity (VO2max), strength, flexibility and balance before and after the training period were tested...
2017: International Journal of Circumpolar Health
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