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Chronobiology International

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https://www.readbyqxmd.com/read/28318321/social-jet-lag-sleep-corrected-formula
#1
Konrad S Jankowski
Social jet lag is a term describing misalignment between social and biological times. In this article, it is argued that the currently used formula for social jet lag captures not only this misalignment, but also sleep debt resulting from sleep deprivation during workdays. It is proposed to adopt the sleep-corrected formula for social jet lag, which takes the form of the difference between the sleep onset on free days and workdays in the case of subjects with longer sleep and later (or equal) sleep onset on free days compared to workdays; it takes the form of the difference between the sleep offset on free days and workdays for subjects with longer sleep and earlier (or equal) sleep offset on workdays compared to free days...
March 20, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28306393/circannual-rhythm-of-plasmatic-vitamin-d-levels-and-the-association-with-markers-of-psychophysical-stress-in-a-cohort-of-italian-professional-soccer-players
#2
Giovanni Lombardi, Jacopo Antonino Vitale, Sergio Logoluso, Giovanni Logoluso, Nino Cocco, Giulio Cocco, Antonino Cocco, Giuseppe Banfi
Adequate plasmatic Vitamin D levels are crucial to maintain calcium homeostasis and bone metabolism both in the general population and in athletes. Correct dietary supply and a regular sun exposure are fundamental for allowing the desired and effective fitness level. Past studies highlighted a scenario of Vitamin D insufficiency among professional soccer players in several countries, especially in North Europe, whilst a real deficiency in athletes is rare. The typical seasonal fluctuations of Vitamin D are wrongly described transversally in athletes belonging to teams that play at different latitudes and a chronobiologic approach studying the Vitamin D circannual rhythm in soccer players has not been described yet...
March 17, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28282238/changes-in-the-sleep-wake-rhythm-sleep-quality-mood-and-quality-of-life-of-patients-receiving-treatment-for-lung-cancer-a-longitudinal-study
#3
Wen-Pei Chang, Chia-Chin Lin
Studies on the diurnal sleep-wake rhythm of patients with lung cancer have mostly examined patients cross-sectionally, whereas the effects of lung cancer treatment over time have rarely been considered. Through long-term longitudinal tracking of patients with lung cancer, this study examined changes in their sleep-wake rhythm, sleep quality, anxiety, depressive symptoms, fatigue and quality of life (QoL) at various treatment stages. In addition, factors affecting their QoL were explored. Hierarchical linear modeling was adopted to analyze a convenience sample of 82 patients with lung cancer...
March 10, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28282237/associations-of-common-noncommunicable-medical-conditions-and-chronic-diseases-with-chronotype-in-a-population-based-health-examination-study
#4
Syaron Basnet, Ilona Merikanto, Tuuli Lahti, Satu Männistö, Tiina Laatikainen, Erkki Vartiainen, Timo Partonen
Chronotype is an emerging predictor of health and longevity, and understanding its influence on chronic diseases is important for constructing conceptual models of long-term pathways to health. We assessed the associations of chronotype with health status in the general Finnish adult population. Our population-based data were derived from the National FINRISK 2012 study and consisted of 4414 participants, aged 25-74 years, living in Finland. As part of their health examination, participants were asked about their circadian preference to the daily activities (morningness-eveningness) and a diagnosis or treatment for a set of common noncommunicable medical conditions and chronic diseases during the past 12 months...
March 10, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28272914/chronotype-class-times-and-academic-achievement-of-university-students
#5
Tristan Enright, Roberto Refinetti
Numerous studies over the years have documented an effect of human chronotypes on physiological and psychological processes. Studies evaluating the impact of an individual's chronotype on his/her academic achievement have indicated that morning chronotypes have an academic advantage over evening chronotypes. However, these studies did not account for the time of day in which the participants were being evaluated. The goal of the present study was to examine whether morning chronotypes do have an academic advantage over evening chronotypes when the time of day of classes and exams is taken into consideration...
March 8, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28267366/eveningness-associates-with-smoking-and-sleep-problems-among-pregnant-women
#6
Ilona Merikanto, E Juulia Paavonen, Outi Saarenpää-Heikkilä, Tiina Paunio, Timo Partonen
Sleep problems during pregnancy impair maternal health and increase the risk for adverse pregnancy outcome. The circadian preference toward eveningness has been associated with sleep problems in previous studies. Here, we studied whether evening-type women had more sleep problems during their pregnancy, as compared with other chronotypes, in a sample consisting of 1653 pregnant women from the Finnish CHILD-SLEEP Birth Cohort. Chronotype was assessed with a shortened version of the morningness-eveningness questionnaire...
March 7, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28267364/sudden-death-circadian-rhythm-in-chagasic-patients-compared-to-non-chagasic-patients
#7
Juan Marques, Iván Mendoza, Claudia Suárez, Federico Moleiro, Iván Mendoza-Britto, Maria Marques-Mejías
Chagas disease (Ch) affects 8-10 million people in Latin America, most of them are poor. Sudden death (SD) is the major cause of death in patients with Ch. To the best of our knowledge, the present report covers the largest reported series comparing the SD of Ch versus non-Ch patients Objective: To compare the circadian rhythm of SD in Ch versus non-Ch patients. METHODS: Retrospective analysis of all the cases of SD recorded in our department, including autopsied patients from 1963 until 2011...
March 7, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28276850/associations-between-period-3-gene-polymorphisms-and-sleep-chronotype-related-variables-in-patients-with-late-life-insomnia
#8
Hader A Mansour, Joel Wood, Kodavali V Chowdari, Divya Tumuluru, Mikhil Bamne, Timothy H Monk, Martica H Hall, Daniel J Buysse, Vishwajit L Nimgaonkar
A variable number tandem repeat polymorphism (VNTR) in the period 3 (PER3) gene has been associated with heritable sleep and circadian variables, including self-rated chronotypes, polysomnographic (PSG) variables, insomnia and circadian sleep-wake disorders. This report describes novel molecular and clinical analyses of PER3 VNTR polymorphisms to better define their functional consequences. As the PER3 VNTR is located in the exonic (protein coding) region of PER3, we initially investigated whether both alleles (variants) are transcribed into messenger RNA in human fibroblasts...
February 27, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28276851/predicting-the-actigraphy-based-acrophase-using-the-morningness-eveningness-questionnaire-meq-in-college-students-of-north-italy
#9
Eliana Roveda, Jacopo Vitale, Angela Montaruli, Letizia Galasso, Franca Carandente, Andrea Caumo
Actigraphy is the reference objective method to measure circadian rhythmicity. One simpler subjective approach to assess the circadian typology is the Morningness-Eveningness Questionnaire (MEQ) by Horne and Ostberg. In this study, we compared the MEQ score against the actigraphy-based circadian parameters MESOR, amplitude and acrophase in a sample of 54 students of the University of Milan in Northern Italy. MEQ and the acrophase resulted strongly and inversely associated (r = -0.84, p < 0.0001), and their relationship exhibited a clear-cut linear trend...
February 21, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28276854/activity-sleep-and-ambient-light-have-a-different-impact-on-circadian-blood-pressure-heart-rate-and-body-temperature-rhythms
#10
D G Gubin, D Weinert, S V Rybina, L A Danilova, S V Solovieva, A M Durov, N Y Prokopiev, P A Ushakov
The aim of the present study was to investigate the impact of endogenous and exogenous factors for the expression of the daily rhythms of body temperature (BT), blood pressure (BP) and heart rate (HR). One hundred and seventy-three young adults (YA), 17-24 years old (y.o.), of both genders were studied under a modified constant-routine (CR) protocol for 26 h. Participants were assigned randomly to groups with different lighting regimens: CR-LD, n = 77, lights (>400 l×) on from 09:00 to 17:00 h and off (<10 l×) from 17:00 to 09:00 next morning; CR-LL, n = 81, lights on (>400 l×) during the whole experimental session; CR-DD, n = 15, constant dim light (<10 l×) during the whole experiment...
February 16, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28276853/worsening-of-rest-activity-circadian-rhythm-and-quality-of-life-in-female-breast-cancer-patients-along-progression-of-chemotherapy-cycles
#11
Armiya Sultan, Vivek Choudhary, Arti Parganiha
Chemotherapy and its associated side effects can induce the disruption of circadian rest-activity rhythm and may have negative consequences on health-related quality of life (HRQoL) of cancer patients. In the current study, repeated-measures cross-sectional design was implemented to determine the status of circadian rest-activity rhythm and to assess the HRQoL of newly diagnosed female breast cancer patients those were planned to receive six cycles of chemotherapy. Rest activity and HRQoL were assessed in twenty-five patients during chemotherapy cycles 1st (C1), 3rd (C3), and 6th (C6) immediately after they reported to the outdoor ward of the Regional Cancer Center, Pt...
February 16, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28276852/correlations-between-sleep-patterns-and-cardiovascular-diseases-in-a-chinese-middle-aged-population
#12
Chuangshi Wang, Guang Hao, Jian Bo, Wei Li
Epidemiological and animal studies have suggested an association between habitual sleep patterns and cardiovascular (CV) disease, but the results are still controversial. Therefore, the aims of this study are to investigate the relationships between habitual sleep patterns and CV disease based on Prospective Urban Rural Epidemiology (PURE) China study. PURE China study recruited 46 285 participants, aged 35-70, from 12 provinces and 115 communities in China. Habitual sleep patterns and CV disease were self-reported...
February 16, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28156174/seasonal-variation-in-spontaneous-intracerebral-hemorrhage-in-northern-israel
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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...
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
#19
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...
2017: Chronobiology International
https://www.readbyqxmd.com/read/28128995/later-chronotype-is-associated-with-higher-hemoglobin-a1c-in-prediabetes-patients
#20
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...
2017: Chronobiology International
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