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https://www.readbyqxmd.com/read/28912014/acute-alerting-effects-of-light-a-systematic-literature-review
#1
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 and to assess to what extent they depend on other factors, such as time of day, exposure duration and sleep pressure...
September 11, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28910540/sleep-quality-chronotype-and-metabolic-syndrome-components-in-bipolar-disorders-during-the-remission-period-results-from-the-face-bd-cohort
#2
Ophélia Godin, Chantal Henry, Marion Leboyer, Jean-Michel Azorin, Valerie Aubin, Frank Bellivier, Mircea Polosan, Philippe Courtet, Sebastien Gard, Jean-Pierre Kahn, Josephine Loftus, Christine Passerieux, Dominique Costagliola, Bruno Etain
Data on sleep or circadian abnormalities and metabolic disturbances in euthymic bipolar disorders are scarce and based on small sample sizes. The aim of this study was to explore the associations between sleep disturbances, chronotype and metabolic components in a large sample of euthymic patients with bipolar disorders (BD). From 2009 to 2015, 752 individuals with bipolar disorders from the FACE-BD cohort were included and assessed for sleep quality, chronotype and metabolic components. The Structured Clinical Interview for DSM-IV Axis I Disorders (SCID) was used to confirm the diagnosis of BD...
September 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28900189/misalignment-with-the-external-light-environment-drives-metabolic-and-cardiac-dysfunction
#3
Alexander C West, Laura Smith, David W Ray, Andrew S I Loudon, Timothy M Brown, David A Bechtold
Most organisms use internal biological clocks to match behavioural and physiological processes to specific phases of the day-night cycle. Central to this is the synchronisation of internal processes across multiple organ systems. Environmental desynchrony (e.g. shift work) profoundly impacts human health, increasing cardiovascular disease and diabetes risk, yet the underlying mechanisms remain unclear. Here, we characterise the impact of desynchrony between the internal clock and the external light-dark (LD) cycle on mammalian physiology...
September 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28884932/the-relationship-between-depression-and-chronotype-a-longitudinal-assessment-during-childhood-and-adolescence
#4
Dustin A Haraden, Benjamin C Mullin, Benjamin L Hankin
BACKGROUND/OBJECTIVE: During adolescence, chronotype shifts toward "eveningness." "Eveningness" is related to negative physical and mental health outcomes. Little is known about what influences the shift in chronotype beyond pubertal status. The current study examined the influence of earlier depression predicting later individual differences in adolescent chronotype, accounting for pubertal status, and the prospective prediction of later increases in depression from earlier chronotype...
September 8, 2017: Depression and Anxiety
https://www.readbyqxmd.com/read/28880049/sleep-and-glycemic-control-in-adolescents-with-type-1-diabetes
#5
Julia von Schnurbein, Claudia Boettcher, Stephanie Brandt, Beate Karges, Desiree Dunstheimer, Angela Galler, Christian Denzer, Friederike Denzer, Heike Vollbach, Martin Wabitsch, Till Roenneberg, Celine Vetter
BACKGROUND: Increasing evidence link sleep curtailment and circadian misalignment with adverse metabolic outcome. Adolescents might be most affected, given their late sleep timing and early school and work start times. OBJECTIVE: Our aim was to examine the impact of poor sleeping habits on glycemic control in adolescents with type 1 diabetes. SUBJECTS AND METHODS: This was a non-interventional multicenter study across Germany recruiting pubertally mature adolescents with type 1 diabetes...
June 14, 2017: Pediatric Diabetes
https://www.readbyqxmd.com/read/28869038/the-genomic-landscape-of-human-cellular-circadian-variation-points-to-a-novel-role-for-the-signalosome
#6
Ludmila Gaspar, Cedric Howald, Konstantin Popadin, Bert Maier, Daniel Mauvoisin, Ermanno Moriggi, Maria Gutierrez-Arcelus, Emilie Falconnet, Christelle Borel, Dieter Kunz, Achim Kramer, Frederic Gachon, Emmanouil T Dermitzakis, Stylianos E Antonarakis, Steven A Brown
The importance of natural gene expression variation for human behavior is undisputed, but its impact on circadian physiology remains mostly unexplored. Using umbilical cord fibroblasts, we have determined by genome-wide association how common genetic variation impacts upon cellular circadian function. Gene set enrichment points to differences in protein catabolism as one major source of clock variation in humans. The two most significant alleles regulated expression of COPS7B, a subunit of the COP9 signalosome...
September 4, 2017: ELife
https://www.readbyqxmd.com/read/28843917/subjective-versus-objective-evening-chronotypes-in-bipolar-disorder
#7
Anda Gershon, Christopher N Kaufmann, Colin A Depp, Shefali Miller, Dennis Do, Jamie M Zeitzer, Terence A Ketter
BACKGROUND: Disturbed sleep timing is common in bipolar disorder (BD). However, most research is based upon self-reports. We examined relationships between subjective versus objective assessments of sleep timing in BD patients versus controls. METHODS: We studied 61 individuals with bipolar I or II disorder and 61 healthy controls. Structured clinical interviews assessed psychiatric diagnoses, and clinician-administered scales assessed current mood symptom severity...
August 18, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28837395/nightshift-work-chronotype-and-genome-wide-dna-methylation-in-blood
#8
Charleen D Adams, Kristina M Jordahl, Wade Copeland, Dana K Mirick, Xiaoling Song, Cassandra L Sather, Karl Kelsey, Andres Houseman, Scott Davis, Timothy Randolph, Parveen Bhatti
Molecular mechanisms underlying the negative health effects of shift work are poorly understood, which remains a barrier to developing intervention strategies to protect the long-term health of shift workers. We evaluated genome-wide differences in DNA methylation (measured in blood) between 111 actively employed female nightshift and 86 actively employed female dayshift workers from the Seattle metropolitan area. We also explored the effect of chronotype (i.e., measure of preference for activity earlier or later in the day) on DNA methylation among 110 of the female nightshift workers and an additional group of 131 male nightshift workers...
August 24, 2017: Epigenetics: Official Journal of the DNA Methylation Society
https://www.readbyqxmd.com/read/28827040/effect-of-sleep-patterns-on-levetiracetam-induced-mood-changes
#9
Randip Taneja, Krystal Hunter, Evren Burakgazi-Dalkilic, Melissa Carran
A common side effect of levetiracetam is the onset of neuropsychiatric symptoms such as mood changes including depression, anxiety, agitation, and sometimes psychosis. We performed a retrospective analysis to examine the effect of sleep pattern and chronotype on individual susceptibility to levetiracetam-induced mood changes. We reviewed records of 110 adults with epilepsy presenting to our clinic during a 3-month period, and categorized them into those currently on levetiracetam, and those no longer taking it because of mood-related adverse effects...
August 18, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28794633/sleep-problems-in-university-students-an-intervention
#10
Angelika Anita Schlarb, Anja Friedrich, Merle Claßen
INTRODUCTION: Up to 60% of all college students suffer from a poor sleep quality, and 7.7% meet all criteria of an insomnia disorder. Sleep problems have a great impact on the students' daily life, for example, the grade point average. Due to irregular daytime routines, chronotype changes, side jobs and exam periods, they need specialized treatments for improving sleep. "Studieren wie im Schlaf" (SWIS; (studying in your sleep)) is a multicomponent sleep training that combines Cognitive Behavioral Therapy for Insomnia and Hypnotherapy for Insomnia to improve students' sleep, insomnia symptoms and nightmares...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28793353/what-thedress-reveals-about-the-role-of-illumination-priors-in-color-perception-and-color-constancy
#11
Stacey Aston, Anya Hurlbert
The disagreement between people who named #theDress (the Internet phenomenon of 2015) "blue and black" versus "white and gold" is thought to be caused by individual differences in color constancy. It is hypothesized that observers infer different incident illuminations, relying on illumination "priors" to overcome the ambiguity of the image. Different experiences may drive the formation of different illumination priors, and these may be indicated by differences in chronotype. We assess this hypothesis, asking whether matches to perceived illumination in the image and/or perceived dress colors relate to scores on the morningness-eveningness questionnaire (a measure of chronotype)...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28782143/dynamics-of-cerebral-responses-to-sustained-attention-performance-during-one-night-of-sleep-deprivation
#12
Yuanqiang Zhu, Yibin Xi, Ningbo Fei, Yuchen Liu, Xinxin Zhang, Lin Liu, Ziliang Xu, Jinbo Sun, Xuejuan Yang, Hong Yin, Jie Tian, Wei Qin
Total sleep deprivation (TSD) is increasingly common in modern society bringing various neurobehavioural effects. Dynamic changes of behaviour performances during TSD have been reported extensively, while the cerebral activation underlying such changes have not been elucidated clearly. This study aimed to investigate dynamic changes in cerebral responses to the fastest and slowest psychomotor vigilance task (PVT) trials during TSD. Thirty-six healthy subjects with intermediate chronotype performed the PVT while undergoing functional magnetic resonance imaging every 2 h from 22:00 hours on the first day to 06:00 hours on the second day (i...
August 6, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28777361/-associations-between-chronotype-road-accidents-and-polymorphisms-in-genes-linked-with-biological-clock-and-dopaminergic-system
#13
A O Taranov, A N Puchkova, P A Slominsky, T V Tupitsyna, V V Dementiyenko, V B Dorokhov
Public transport driving is a highly demanding activity requiring high skills and responsibility. Shift work, problems with regular sleep schedule negatively impact psychomotor reactions, cognitive functions and ability to react appropriately to the changing environment. For professional drivers all these factors may lead to the increased risk of a road accident. Individual differences in chronotype, cognitive and emotional control are partially genetically determined. AIM: Our study aimed to investigate the possible associations between chronotype parameters, traffic accident history and single nucleotide polymorphisms (SNPs) in a number of genes: RORA (rs1159814), CLOCK (rs12649507), PER3 (rs2640909), NPSR1 (rs324981), NPAS2 (rs4851377), DRD3 (rs6280), SLC6A3 (rs6347), DBH (rs1611125)...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/28775132/shift-work-that-involves-circadian-disruption-and-breast-cancer-a-first-application-of-chronobiological-theory-and-the-consequent-challenges
#14
Lin Fritschi, J Valérie Groß, Ursula Wild, Jane S Heyworth, Deborah C Glass, Thomas C Erren
OBJECTIVES: In 2007, the International Agency for Research on Cancer classified shift work involving circadian disruption (CD) as probably carcinogenic to humans. Circadian disruption could be conceptualised as the overlap of activity, such as work, with an individual's biological night. The latter can be approximated from a worker's chronotype (or morning/evening preference). Few previous studies have taken chronotype into account when assessing CD caused by shift work. Our objective was to test the hypothesis that women working during their biological night would be at increased risk of breast cancer...
August 3, 2017: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28769855/ratings-of-perceived-exertion-and-self-reported-mood-state-in-response-to-high-intensity-interval-training-a-crossover-study-on-the-effect-of-chronotype
#15
Jacopo A Vitale, Antonio La Torre, Roberto Baldassarre, Maria F Piacentini, Matteo Bonato
The aim of this study was to investigate the influence of chronotype on mood state and ratings of perceived exertion (RPE) before and in response to acute high intensity interval exercise (HIIE) performed at different times of the day. Based on the morningness-eveningness questionnaire, 12 morning-types (M-types; N = 12; age 21 ± 2 years; height 179 ± 5 cm; body mass 74 ± 12 kg) and 11 evening-types (E-types; N = 11; age 21 ± 2 years; height 181 ± 11 cm; body mass 76 ± 11 kg) were enrolled in a randomized crossover study...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28759270/associations-between-chronotypes-and-psychological-vulnerability-factors-of-depression
#16
Niki Antypa, Bart Verkuil, Marc Molendijk, Robert Schoevers, Brenda W J H Penninx, Willem Van Der Does
Chronotypes have been associated with psychopathology. The eveningness chronotype has been consistently linked with depressed states or depressive disorder, but the underlying mechanism remains unclear. Prior studies have shown associations between chronotype and personality traits that are linked to depression (e.g. neuroticism), but other psychological vulnerability factors have not been previously investigated in relation to chronotypes. The aim of this study was to examine the association between chronotypes, depression and psychological risk factors of depression (namely, cognitive reactivity and worry), in a large cohort of depressed patients and healthy individuals...
July 31, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28732185/chronotype-sleep-characteristics-and-musculoskeletal-disorders-among-hospital-nurses
#17
Yuan Zhang, Jeanne F Duffy, Elizabeth Ronan de Castillero, Kefang Wang
Work-related musculoskeletal disorders (WMSDs) persist as the leading occupational injury, accounting for nearly half of nurses' total occupational injuries. Musculoskeletal pain is a known cause of sleep disruption, and individuals with WMSDs that interfere with sleep often report more pain. Evening chronotype has been associated with poor sleep among nurses. However, the associations among chronotype, sleep, and WMSDs are still unclear, and were explored in the present study. A cross-sectional survey was administered to 397 nurses, with 47...
July 1, 2017: Workplace Health & Safety
https://www.readbyqxmd.com/read/28722202/medical-residents-circadian-preferences-across-specialties
#18
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
#19
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
#20
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
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