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Chronobiology International

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https://www.readbyqxmd.com/read/28156174/seasonal-variation-in-spontaneous-intracerebral-hemorrhage-in-northern-israel
#1
G Telman, G E Sviri, E Sprecher, Y Amsalem, R Avizov
The incidence of spontaneous intracerebral hemorrhage (sICH) and ischemic stroke vary across seasons. Most studies examining seasonal variation in sICH have been conducted in countries with significant climatic changes across seasons, whereas studies from the Mediterranean region, which has a relatively mild winter, are limited in number and have produced inconsistent results. Further studies from the region are called for, especially from countries where sICH seasonality has not yet been explored. A total of 974 patients with sICH between 1 January 2000 and 31 December 2014 were included in this study...
February 3, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28156172/impact-of-daylight-savings-time-on-spontaneous-pregnancy-loss-in-in-vitro-fertilization-patients
#2
Constance Liu, Joseph A Politch, Evan Cullerton, Kathryn Go, Samuel Pang, Wendy Kuohung
Transition into daylight savings time (DST) has studied negative impacts on health, but little is known regarding impact on fertility. This retrospective cohort study evaluates DST impact on pregnancy and pregnancy loss rates in 1,654 autologous in vitro fertilization cycles (2009 to 2012). Study groups were identified based on the relationship of DST to embryo transfer. Pregnancy rates were similar in Spring and Fall (41.4%, 42.2%). Pregnancy loss rates were also comparable between Spring and Fall (15.5%, 17...
February 3, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28156168/evolution-of-circadian-rhythms-in-drosophila-melanogaster-populations-reared-in-constant-light-and-dark-regimes-for-over-330-generations
#3
Radhika Shindey, Vishwanath Varma, K L Nikhil, Vijay Kumar Sharma
Organisms are believed to have evolved circadian clocks as adaptations to deal with cyclic environmental changes, and therefore it has been hypothesized that evolution in constant environments would lead to regression of such clocks. However, previous studies have yielded mixed results, and evolution of circadian clocks under constant conditions has remained an unsettled topic of debate in circadian biology. In continuation of our previous studies, which reported persistence of circadian rhythms in Drosophila melanogaster populations evolving under constant light, here we intended to examine whether circadian clocks and the associated properties evolve differently under constant light and constant darkness...
February 3, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28156163/post-infarct-sleep-disruption-and-its-relation-to-cardiac-remodeling-in-a-rat-model-of-myocardial-infarction
#4
Marjan Aghajani, Mahdieh Faghihi, Alireza Imani, Mohammad Reza Vaez Mahdavi, Abbas Shakoori, Tayebeh Rastegar, Hoda Parsa, Saman Mehrabi, Fatemeh Moradi, Ehsan Kazemi Moghaddam
Sleep disruption after myocardial infarction (MI) by affecting ubiquitin-proteasome system (UPS) is thought to contribute to myocardial remodeling and progressive worsening of cardiac function. The aim of current study was to test the hypothesis about the increased risk of developing heart failure due to experience of sleep restriction (SR) after MI. Male Wistar rats (n = 40) were randomly assigned to four experimental groups: (1) Sham, (2) MI, (3) MI and SR (MI + SR) (4) Sham and SR (Sham + SR). MI was induced by permanent ligation of left anterior descending coronary artery...
February 3, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28156158/the-transition-from-day-to-night-activity-is-a-risk-factor-for-the-development-of-cns-oxygen-toxicity-in-the-diurnal-fat-sand-rat-psammomys-obesus
#5
Mirit Eynan, Adi Biram, Michael Mullokandov, Noga Kronfeld-Schor, Rotem Paz-Cohen, Dvir Menajem, Yehuda Arieli
Performance and safety are impaired in employees engaged in shift work. Combat divers who use closed-circuit oxygen diving apparatus undergo part of their training during the night hours. The greatest risk involved in diving with such apparatus is the development of central nervous system oxygen toxicity (CNS-OT). We investigated whether the switch from day-to-night activity may be a risk factor for the development of CNS-OT using a diurnal animal model, the fat sand rat (Psammomys obesus). Animals were kept on a 12:12 light-dark schedule (6 a...
February 3, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28139148/circadian-preferences-in-young-adults-psychometric-properties-and-factor-structure-of-the-portuguese-version-of-the-preferences-scale-ps-6
#6
Daniel Ruivo Marques, Ana Allen Gomes, Lee Di Milia, Maria Helena Pinto de Azevedo
Morningness is a trait-like variable which has been extensively studied within chronobiology. Despite the number of existing measures to assess morningness, there is a need for brief instruments that are psychometrically sound to be used in applied settings. Accordingly, the modified version of the Preferences Scale (PS-6) comprises six items and was reported to have adequate reliability and satisfactory validity indicators. In this article, the psychometric properties of the Portuguese version of the PS-6 are reported...
January 31, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28128998/geographic-latitude-and-sleep-duration-a-population-based-survey-from-the-tropic-of-capricorn-to-the-antarctic-circle
#7
Pablo E Brockmann, David Gozal, Luis Villarroel, Felipe Damiani, Felipe Nuñez, Christian Cajochen
The impact of latitude on sleep duration remains virtually unexplored, even though latitude exerts profound influences on daylight duration. Using Chile as a one-country model, we explored on the potential associations between sleep duration and latitude. Based on the 2nd Chilean Health Survey, we identified reported sleep data during spring of people living from north to south in Chilean cities, located between 18°29'S to 53°18'S (4329 km distance at same longitude). A total of n = 2493 participants were included (mean age 45...
January 27, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28128995/later-chronotype-is-associated-with-higher-hemoglobin-a1c-in-prediabetes-patients
#8
Thunyarat Anothaisintawee, Dumrongrat Lertrattananon, Sangsulee Thamakaison, Kristen L Knutson, Ammarin Thakkinstian, Sirimon Reutrakul
The circadian system is known to play a role in glucose metabolism. Chronotype reflects the interindividual variability in the phase of entrainment. Those with later chronotype typically prefer later times in the day for different activities such as sleep or meals. Later chronotype has been shown to be associated with metabolic syndrome, increased diabetes risk and poorer glycemic control in type 2 diabetes patients. In addition, "social jetlag", a form of circadian misalignment due to a mismatch between social rhythms and the circadian clock, has been shown to be associated with insulin resistance...
January 27, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28128994/owls-larks-swifts-woodcocks-and-they-are-not-alone-a-historical-review-of-methodology-for-multidimensional-self-assessment-of-individual-differences-in-sleep-wake-pattern
#9
Arcady A Putilov
Differences between the so-called larks and owls representing the opposite poles of morningness-eveningness dimension are widely known. However, scientific consensus has not yet been reached on the methodology for ranking and typing people along other dimensions of individual variation in their sleep-wake pattern. This review focused on the history and state-of-the-art of the methodology for self-assessment of individual differences in more than one trait or adaptability of the human sleep-wake cycle. The differences between this and other methodologies for the self-assessment of trait- and state-like variation in the perceived characteristics of daily rhythms were discussed and the critical issues that remained to be addressed in future studies were highlighted...
January 27, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28128993/environmental-factors-contributed-to-circannual-rhythm-of-semen-quality
#10
Huan Mao, Lei Feng, Wan-Xi Yang
We investigated whether human semen parameters present circannual rhythm or not, and whether environmental factors exert on semen quality. This retrospective study used data of patients mainly from Reproductive Medicine Center and Urology and Andrology Clinic of a general hospital in China. Sperm concentration and motility were measured by computer aided sperm analysis (CASA). Sperm morphology was scored based on the strict criteria (WHO, 2010). The Kruskal-Wallis rank test was used to investigate the relationship between semen parameters and season/month...
January 27, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28128991/associations-between-nocturnal-urinary-6-sulfatoxymelatonin-obstructive-sleep-apnea-severity-and-glycemic-control-in-type-2-diabetes
#11
Sirimon Reutrakul, Nantaporn Siwasaranond, Hataikarn Nimitphong, Sunee Saetung, Naricha Chirakalwasan, La-Or Chailurkit, Kriangsuk Srijaruskul, Boonsong Ongphiphadhanakul, Ammarin Thakkinstian
Reduced nocturnal secretion of melatonin, a pineal hormone under circadian control, and obstructive sleep apnea have been both identified as risk factors for the development of type 2 diabetes mellitus. Whether they interact to impact glycemic control in patients with existing type 2 diabetes is not known. Therefore, this study explores the relationships between obstructive sleep apnea, melatonin and glycemic control in type 2 diabetes. As diabetic retinopathy may affect melatonin secretion, we also explore the relationship between retinopathy, melatonin and glycemic control...
January 27, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28107043/the-impact-of-meal-timing-on-cardiometabolic-syndrome-indicators-in-shift-workers
#12
Hylton E Molzof, Michael D Wirth, James B Burch, Nitin Shivappa, James R Hebert, Russell L Johnson, Karen L Gamble
The aims of this study were to 1) compare the inflammatory potential of night- and day-shift nurses' diets with regard to time of day and work status and 2) explore how the timing of food intake during work and off-work is associated with cardiometabolic syndrome (CMS) risk factors between these two groups. Female nurses (N = 17; 8 day-shift and 9 night-shift) reported food intake over 9 days. On a middle day off of work, metabolic parameters were measured after an overnight fast. Energy/macronutrient intake and inflammatory potential of dietary intake (as assessed via the Dietary Inflammatory Index(TM)) were calculated for nurses' workdays, work nights, off-work days, and off-work nights...
January 20, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28107042/association-between-depressive-symptoms-and-morningness-eveningness-sleep-duration-and-rotating-shift-work-in-japanese-nurses
#13
Fumiharu Togo, Takahiro Yoshizaki, Taiki Komatsu
Higher depressive symptoms have been reported in rotating shift workers compared with day workers. Depressive symptoms in adults who do not engage in night work have also been shown to be associated with chronotype and sleep duration. This study examines associations between depressive symptoms, morningness-eveningness (i.e. the degree to which people prefer to be active in the morning or the evening), sleep duration and rotating shift work. Japanese nurses (1252 day workers and 1780 rotating shift workers, aged 20-59) were studied using a self-administered questionnaire...
January 20, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28107041/sleep-and-optimism-a-longitudinal-study-of-bidirectional-causal-relationship-and-its-mediating-and-moderating-variables-in-a-chinese-student-sample
#14
Esther Yuet Ying Lau, C Harry Hui, Jasmine Lam, Shu-Fai Cheung
While both sleep and optimism have been found to be predictive of well-being, few studies have examined their relationship with each other. Neither do we know much about the mediators and moderators of the relationship. This study investigated (1) the causal relationship between sleep quality and optimism in a college student sample, (2) the role of symptoms of depression, anxiety, and stress as mediators, and (3) how circadian preference might moderate the relationship. Internet survey data were collected from 1,684 full-time university students (67...
January 20, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28107036/pitfalls-in-saliva-melatonin-measurement
#15
David J Kennaway, Mark D Salkeld
No abstract text is available yet for this article.
January 20, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28102700/aryl-hydrocarbon-receptor-deficient-mice-are-protected-from-high-fat-diet-induced-changes-in-metabolic-rhythms
#16
Cassie Jaeger, Canxin Xu, Mingwei Sun, Stacey Krager, Shelley A Tischkau
High fat diet (HFD) consumption alters the synchronized circadian timing system resulting in harmful loss, gain or shift of transcriptional oscillations. The aryl hydrocarbon receptor (AhR) shares structural homology to clock genes, containing both PAS domains and basic helix-loop helix structural motifs, allowing for interaction with components of the primary circadian feedback loop. Activation of AhR alters circadian rhythmicity, primarily through inhibition of Clock/Bmal1-mediated regulation of Per1. AhR-deficient mice are protected from diet-induced metabolic dysfunction, exhibiting enhanced insulin sensitivity and glucose tolerance...
January 19, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28060541/response-to-kennaway-et-al-comment-on-the-study-school-start-time-influences-melatonin-and-cortisol-levels-in-children-and-adolescents-a-community-based-study
#17
Alicia Carissimi, Lilian Corrêa da Silva, Cristian Patrick Zeni, Maria Paz Hidalgo
No abstract text is available yet for this article.
January 6, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28060540/obituary-james-maris-waterhouse-2-august-1944-25-october-2016
#18
Greg Atkinson, Ben Edwards, Dietmar Weinert
No abstract text is available yet for this article.
January 6, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28060532/critical-slowing-down-as-an-early-warning-of-transitions-in-episodes-of-bipolar-disorder-a-simulation-study-based-on-a-computational-model-of-circadian-activity-rhythms
#19
Atiyeh Bayani, Fatemeh Hadaeghi, Sajad Jafari, Greg Murray
Bipolar disorder is characterized by repeated episodes of mania and depression, and can be understood as pathological complex system behaviour involving cognitive, affective and psychomotor disturbance. Accurate prediction of episode transitions in the long-term pattern of mood changes in bipolar disorder could improve the management of the disorder by providing an objective early warning of relapse. In particular, circadian activity changes measured via actigraphy may contain clinically relevant signals of imminent systemic dysregulation...
2017: Chronobiology International
https://www.readbyqxmd.com/read/28060525/diurnal-rhythms-in-psychological-reward-functioning-in-healthy-young-men-wanting-liking-and-learning
#20
Jamie E M Byrne, Greg Murray
A range of evidence suggests that human reward functioning is partly driven by the endogenous circadian system, generating 24-hour rhythms in behavioural measures of reward activation. Reward functioning is multifaceted but literature to date is largely limited to measures of self-reported positive mood states. The aim of this study was to advance the field by testing for hypothesised diurnal variation in previously unexplored components of psychological reward: 'wanting', liking, and learning using subjective and behavioural measures...
2017: Chronobiology International
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