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Chronobiology International

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https://www.readbyqxmd.com/read/28548897/evening-light-exposure-to-computer-screens-disrupts-human-sleep-biological-rhythms-and-attention-abilities
#1
A Green, M Cohen-Zion, A Haim, Y Dagan
The use of electronic devices with light-emitting screens has increased exponentially in the last decade. As a result, humans are almost continuously exposed to unintentional artificial light. We explored the independent and combined effects of two aspects of screen illumination, light wavelength, and intensity, on sleep, its biological regulation, and related functional outcomes. The 2 × 2 repeated-measure design included two independent variables: screen light intensity (low ([LI] versus high [HI]) and wavelength (short [SWL] versus long [LWL])...
May 26, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28548872/seasonal-and-time-of-day-variations-in-acute-non-image-forming-effects-of-illuminance-level-on-performance-physiology-and-subjective-well-being
#2
L M Huiberts, K C H J Smolders, Y A W De Kort
This study investigated seasonal and time-of-day dependent moderations in the strength and direction of acute diurnal non-image forming (NIF) effects of illuminance level on performance, physiology, and subjective well-being. Even though there are indications for temporal variations in NIF-responsiveness to bright light, scientific insights into potential moderations by season are scarce. We employed a 2 (Light: 165 versus 1700 lx at the eye level, within) × 2 (Season: autumn/winter versus spring, between) × 2 (Time of day: morning versus afternoon, between) mixed-model design...
May 26, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28548869/neurotransmitter-receptor-availability-in-the-rat-brain-is-constant-in-a-24-hour-period
#3
A Oskamp, F Wedekind, T Kroll, D Elmenhorst, A Bauer
Wakefulness and sleep are fundamental characteristics of the brain. We, therefore, hypothesized that transmitter systems contribute to their regulation and will exhibit circadian alterations. We assessed the concentration of various neurotransmitter receptors and transporters including adenosinergic (A1AR, A2AAR, and ENT1), dopaminergic (D1R, D2R, and DAT), and serotonergic (5-HT2AR) target proteins. Adult male Sprague Dawley rats were used and maintained in a 12 h light: 12 h dark cycle (lights on from 07:00 h to 19:00 h)...
May 26, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28537802/seasonal-pattern-in-bipolar-disorders-and-cardio-vascular-risk-factors-a-study-from-the-face-bd-cohort
#4
Pierre A Geoffroy, Ophelia Godin, Diane Mahee, Chantal Henry, Valérie Aubin, Jean-Michel Azorin, Thierry Bougerol, Philippe Courtet, Sébastien Gard, Jean-Pierre Kahn, Christine Passerieux, Marion Leboyer, Frank Bellivier, Bruno Etain
Seasonal pattern (SP) and metabolic syndrome (MetS) are major contributors to poor outcome in bipolar disorders (BD). Patients with seasonal bipolar depression present increased appetite, carbohydrate cravings, weight gain, and hypersomnia, which can increase the development of MetS. MetS also appears to be associated with seasonal mood changes in the general population. This study examines whether a SP in BD is associated with an increased risk of MetS and its sub-components. One thousand four hundred and seventy-one outpatients with BD were systematically enrolled from 2009 to 2016...
May 24, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28537801/association-of-chronotype-and-social-jetlag-with-human-non-verbal-intelligence
#5
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/28537765/factors-associated-with-sleep-duration-in-brazilian-high-school-students
#6
Érico Pereira Gomes Felden, Diego Grasel Barbosa, Geraldo Jose Ferrari Junior, Manoella De Oliveira Santos, Andreia Pelegrini, Diego Augusto Santos Silva
The aim of this study was to investigate the factors associated with short sleep duration on southern Brazilian high school students. Our study was comprised of 1,132 adolescents aged 14 to 19 years, enrolled in public high schools in São José, Brazil. The students answered a questionnaire about working (work and workload), health perception, smoking, school schedule, sleep (duration and daytime sleepiness), and socio-demographics data. The results showed that more than two thirds of adolescent workers had short sleep duration (76...
May 24, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28498716/chronotype-distribution-in-professional-rugby-players-evidence-for-the-environment-hypothesis
#7
Lovemore Kunorozva, Dale E Rae, Laura C Roden
Individual sport athletes have been shown to comprise unusually high proportions of morning-types (MTs) coupled with a higher prevalence of the morningness-associated PERIOD3 variable number tandem repeat (VNTR) allele, PER3(5). The degree to which type of sport selected is influenced by either chronotype or genotype, or the extent to which sporting environment contributes to chronotype is unclear. The aim of this study was to assess chronotype and PER3 VNTR polymorphism frequencies in team sport players and non-athletic controls...
May 12, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28488943/effect-of-blue-blocking-glasses-in-major-depressive-disorder-with-sleep-onset-insomnia-a-randomized-double-blind-placebo-controlled-study
#8
Yuichi Esaki, Tsuyoshi Kitajima, Ippei Takeuchi, Soji Tsuboi, Osamu Furukawa, Masatsugu Moriwaki, Kiyoshi Fujita, Nakao Iwata
Blue wavelengths form the portion of the visible electromagnetic spectrum that most potently regulates circadian rhythm. We hypothesized that wearing blue-blocking (BB) glasses in the evening may influence circadian rhythm disturbances in patients with major depressive disorder (MDD), resulting in improved sleep and mood. We used a randomized placebo-controlled double-blinded design. Patients with MDD with sleep onset insomnia were randomly assigned to wearing either BB glasses or clear glasses (placebo). Patients were instructed to wear the glasses from 20:00 hours until bedtime for 2 weeks...
May 10, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28488939/differences-in-morning-evening-type-and-sleep-duration-between-black-and-white-adults-results-from-a-propensity-matched-uk-biobank-sample
#9
Susan Kohl Malone, Freda Patterson, Alicia Lozano, Alexandra Hanlon
Biological evidence suggests that ethno-racial differences in morning-evening type are possible, whereby Blacks may be more likely to be morning type compared to Whites. However, population-level evidence of ethno-racial difference in morning-evening type is limited. In an earlier study, we reported that morning type was more prevalent in Blacks compared to Whites in the United Kingdom (UK) Biobank cohort (N = 439 933). This study aimed to determine if these ethno-racial differences persisted after accounting for an even broader range of social, environmental and individual characteristics and employing an analytic approach that simulates randomization in observational data, propensity score modeling...
May 10, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28488901/association-of-shiftwork-and-immune-cells-among-police-officers-from-the-buffalo-cardio-metabolic-occupational-police-stress-study
#10
Michael D Wirth, Michael E Andrew, Cecil M Burchfiel, James B Burch, Desta Fekedulegn, Tara A Hartley, Luenda E Charles, John M Violanti
Shift workers suffer from a constellation of symptoms associated with disruption of circadian rhythms including sleep abnormalities, and abnormal hormone secretion (e.g. melatonin, cortisol). Recent, but limited, evidence suggests that shift workers have elevated levels of circulating white blood cells (WBCs) compared to their day working counterparts. Interestingly, recent reviews highlight the strong linkage between the immune system and circadian rhythms which includes, but is not limited to, circulating cell populations and functions...
May 10, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28488899/lifetime-prevalence-of-psychiatric-morbidities-suicidality-and-quality-of-life-in-a-community-population-with-the-bimodal-chronotype-a-nationwide-epidemiologic-study
#11
Won-Hyoung Kim, Doo-Young Jung, Joo-Young Lee, Sung-Man Chang, Hong-Jin Jeon, Jun-Young Lee, Seong-Jin Cho, Dong-Woo Lee, Jae-Nam Bae, Jin Pyo Hong, Maeng-Je Cho, Bong-Jin Hahm
Chronotypes are classified as morning, evening, or intermediate, but there are reports of a bimodal type. This study was undertaken to describe the characteristics of the bimodal chronotype and to explore relationships between the bimodal type and psychiatric disorders, fatigue, and quality of life. A total of 2389 subjects from a Korean national epidemiological survey of psychiatric disorders responded during face-to-face interviews. The Korean Composite International Diagnostic Interview was used to diagnose psychiatric disorders, and the Composite Scale of Morningness was used to assess chronotypes...
May 10, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28488895/sleep-quality-chronotype-temperament-and-bipolar-features-as-predictors-of-depressive-symptoms-among-medical-students
#12
Łukasz Mokros, Andrzej Witusik, Julia Michalska, Wojciech Łężak, Michał Panek, Katarzyna Nowakowska-Domagała, Adam Antczak, Tadeusz Pietras
The assessment of risk factors is a crucial step in the prevention and treatment of affective disorders and should encompass personal dispositions. The aim of this study was to assess the value of chronotype and temperament as independent predictors of depressive symptoms among medical students. The study surveyed 140 students of the Faculty of Medicine with a battery of questionnaires: the Beck Depression Index (BDI), Hypomania Checklist 32 (HCL-32), Pittsburgh Sleep Quality Index (PSQI), Chronotype Questionnaire and Eysenck Personality Questionnaire Revised...
May 10, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28448731/differential-effects-of-circadian-typology-on-sleep-related-symptoms-physical-fatigue-and-psychological-well-being-in-relation-to-resilience
#13
Hong Jun Jeon, Young Rong Bang, Hye Youn Park, Seul A Kim, In-Young Yoon
Various physiological and psychological functions are influenced by circadian typology (CT), which was reported to be related to resilience. However, few studies have assessed the effects of CT in relation to resilience. The aim of the present study was to assess the influence of CT on sleep-related symptoms, physical fatigue and psychological well-being in relation to resilience. The present study included a total of 1794 healthy hospital employees, and they completed the Morningness-Eveningness Questionnaire, Connor-Davidson Resilience Scale, Pittsburgh Sleep Quality Index, Epworth Sleepiness Scale, Fatigue Severity Scale, Hospital Anxiety and Depression Scale and World Health Organization Quality of Life Scale Abbreviated Version...
April 27, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28430534/chronobiological-factors-for-compassion-satisfaction-and-fatigue-among-ambulatory-oncology-caregivers
#14
Daniela Bellicoso, Maureen Trudeau, Margaret I Fitch, Martin R Ralph
Primary caregivers for victims of chronic illness and or trauma experience both positive and negative emotional consequences. These are broadly classified as compassion satisfaction (CS) and compassion fatigue (CF). Because one of the components of CF, burnout, varies with chronotype and sleep quality, we assessed the influence of chronobiological features on the broader constructs of CS and CF. Responses from primary ambulatory care oncology staff working dayshifts were assessed for potential relationships of chronotype and sleep quality with CS and CF using the professional quality of life scale...
April 21, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28430522/impact-of-naturalistic-lighting-on-hospitalized-stroke-patients-in-a-rehabilitation-unit-design-and-measurement
#15
Anders West, Poul Jennum, Sofie Amalie Simonsen, Birgit Sander, Milena Pavlova, Helle K Iversen
INTRODUCTION AND RATIONALE: Stroke is a major cause of acquired cerebral disability among adults, frequently accompanied by depression, anxiety, cognitive impairment, disrupted sleep and fatigue. New ways of intervention to prevent these complications are therefore needed. The major circadian regulator, the suprachiasmatic nucleus, is mainly controlled by natural daylight, and the blue spectrum is considered the most powerful. During stroke rehabilitation, patients typically are mostly indoors and therefore not exposed to the natural daytime variation in light intensity...
April 21, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28430521/perinatal-light-imprinting-of-circadian-clocks-and-systems-pliccs-a-signature-of-photoperiod-around-birth-on-circadian-system-stability-and-association-with-cancer
#16
Philip Lewis, Thomas C Erren
Recent findings from animal models suggest that plasticity of human circadian clocks and systems may be differentially affected by different paradigms of perinatal photoperiod exposure to the detriment of health in later life, including cancer development. Focusing on the example of cancer, we carry out a series of systematic literature reviews concerning perinatal light imprinting of circadian clocks and systems (PLICCS) in animal models, and concerning the risk of cancer development with the primary determinants of the perinatal photoperiod, namely season of birth or latitude of birth...
April 21, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28414547/distribution-of-period-immunoreactive-neurons-and-temporal-change-of-the-immunoreactivity-under-long-day-and-short-day-conditions-in-the-larval-brain-of-the-flesh-fly-sarcophaga-similis
#17
Mizuho Yamamoto, Sakiko Shiga, Shin G Goto
The flesh fly Sarcophaga similis show a clear photoperiodic response; they develop into adults under long days, whereas they arrest their development at the pupal stage under short days. Although the involvement of a circadian clock in photoperiodic time measurement is suggested in this species, the anatomical location of the clock neurons responsible for the time measurement has been unknown. We detected two PERIOD-immunoreactive cell clusters in the larval brain; one cluster was located at the dorsoanterior region and the other at the medial region...
April 17, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28409690/salivary-cortisol-concentration-after-high-intensity-interval-exercise-time-of-day-and-chronotype-effect
#18
Matteo Bonato, Antonio La Torre, Marina Saresella, Ivana Marventano, Giampiero Merati, Jacopo Antonino Vitale
Due to personal and working necessities, the time for exercise is often short, and scheduled early in the morning or late in the afternoon. Cortisol plays a central role in the physiological and behavioral response to a physical challenge and can be considered as an index of exercise stress. Therefore, the aim of this study was to evaluate the influence of the circadian phenotype classification on salivary cortisol concentration in relation to an acute session of high-intensity interval exercise (HIIE) performed at different times of the day...
April 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28409677/circadian-pattern-of-motor-activity-in-adults-with-attention-deficit-hyperactivity-disorder
#19
Lorenzo Tonetti, Andreas Conca, Giancarlo Giupponi, Vincenzo Natale
This study aims to describe the 24-hour activity rhythm in adults with attention-deficit/hyperactivity disorder (ADHD). A total of 18 ADHD patients and 37 healthy controls (HCs) wore an actigraph for 7 days. ADHD patients showed higher motor activity than HCs at 4:00, 6:00, 15:00 and 16:00 hour. Within the theoretical framework of the two-process model of sleep regulation, the observed data may be explained by lower homeostatic sleep pressure in ADHD. This could lead to an increase in motor activity in the second half of the night, when sleep need decreases more rapidly, and in the first half of the afternoon, when patients do not experience the typical post-lunch dip...
April 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28426389/melatonin-and-circadian-rhythms-in-autism-case-report
#20
Gabriela Melloni Zuculo, Bruno S B Gonçalves, Clay Brittes, Luiz Menna-Barreto, Luciana Pinato
Among the most co-occurring conditions in autism spectrum disorders (ASD), there are sleep disorders which may exacerbate associated behavioral disorders and lead to intensification of existing autistic symptoms. Several studies investigating the use of melatonin in the treatment of sleep disorders in ASD have shown comparative efficiency in sleep with little or no side effects. Here we report a case of ASD with non-24-hour rhythm and the effect of melatonin in circadian parameters by actigraphy. Visual analysis of the first 10 days recorded and the periodogram suggest that this patient showed a non-24-hour rhythm...
2017: Chronobiology International
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