2,809 results match your criteria Chronobiology International [Journal]


Variations in circadian genes and individual nocturnal symptoms of insomnia. The HUNT study.

Chronobiol Int 2019 Mar 12:1-8. Epub 2019 Mar 12.

a Department of Research and Development (AFFU) , Norwegian University of Science and Technology (NTNU) , Trondheim , Norway.

Insomnia is a condition characterized by three nocturnal symptoms: problems with sleep onset or maintenance and early morning awakenings (terminal insomnia). Affected individuals may present one or more of these symptoms. Several studies have shown that insomnia is moderately heritable and that proxy phenotypes for the three insomnia symptoms show different heritabilities. Read More

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http://dx.doi.org/10.1080/07420528.2019.1582540DOI Listing

BaSIQS - basic scale on insomnia complaints and quality of sleep: reliability, norms, validity, and accuracy studies, based on clinical and community samples.

Chronobiol Int 2019 Mar 7:1-13. Epub 2019 Mar 7.

e Faculty of Medicine , University of Coimbra , Coimbra , Portugal.

This research focused on the Basic Scale on Insomnia Symptoms and Quality of Sleep (BaSIQS), formerly validated in undergraduates using the Pittsburgh Sleep Quality Index (PSQI), and aimed to expand internal consistency analysis, examine thoroughly its validity, and determine its clinical accuracy. Considering objective and subjective measures, recruiting non-clinical and clinical samples, this research implemented a comprehensive approach to examine convergent and discriminant validity, confirmatory factor analyses, and the BaSIQS sensitivity and specificity. The BaSIQS was filled out along with the Insomnia Severity Index (ISI), questions on sleep-wake schedules, Composite Scale of Morningness (CSM) and Brief Symptom Inventory-18 (BSI-18) by 1198 adults, 18-64 years old, plus another 30 who wore actimeters, recruited in community settings. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2019.1
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http://dx.doi.org/10.1080/07420528.2019.1578970DOI Listing
March 2019
3 Reads

Shift work and depressive symptoms: the mediating effect of vitamin D and sleep quality.

Chronobiol Int 2019 Mar 7:1-9. Epub 2019 Mar 7.

b Department of Occupational and Environmental Medicine, College of Medicine , Hanyang University , Seoul , Republic of Korea.

Shift work is associated with vitamin D level, sleep quality, and depressive symptoms. Vitamin D and sleep quality are also associated with depressive symptoms. The purpose of this study was to compare vitamin D level, sleep quality, and depressive symptoms between shift workers and daytime workers and analyze the mediating effect of vitamin D and sleep quality between shift work and depressive symptoms. Read More

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http://dx.doi.org/10.1080/07420528.2019.1585367DOI Listing

Seasonal variation of body weight loss after bariatric surgery.

Chronobiol Int 2019 Mar 7:1-9. Epub 2019 Mar 7.

b Department of Biochemistry and Molecular Biomedicine, Faculty of Biology , Universitat de Barcelona , Barcelona , Spain.

Seasonal variations have been described in humans in several variables such as sleep, mood, appetite, food preferences, or body weight. We hypothesized that these variations could also influence the decrease in body weight rate in patients submitted to body weight loss interventions. Thus, here we tested the variations of weight loss according to the time of the year the surgery took place in a group patients (n = 1322) submitted to bariatric surgery in the Hospital Universitari de la Vall d'Hebron in Barcelona (geographical coordinates: 41°25'41″N 2°8'32″E). Read More

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http://dx.doi.org/10.1080/07420528.2019.1580716DOI Listing

Chronotype, depression and hippocampal volume: cross-sectional associations from the UK Biobank.

Authors:
Ray Norbury

Chronobiol Int 2019 Feb 22:1-8. Epub 2019 Feb 22.

a Department of Psychology , University of Roehampton , London , UK.

Diurnal preference for evening time has been associated with increased odds for current depression and a number of indices of the disorder. In the current study, the association between chronotype and depression was explored in a population-based sample of 5360 adults aged between 40 and 70 years. Previous work has also suggested that larger hippocampal volume may be protective against depression. Read More

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http://dx.doi.org/10.1080/07420528.2019.1578229DOI Listing
February 2019

No correlation between lunar and menstrual cycle - an early report by the french physician J. A. Murat in 1806.

Authors:
Björn Lemmer

Chronobiol Int 2019 Feb 22:1-4. Epub 2019 Feb 22.

a Experimental Pharmacology Mannheim , Ruprecht-Karls-University of Heidelberg , Mannheim , Germany.

Jean Arnaud Murat was a physician at the Medical School of Montpellier in France. In 1806 he published his outstanding book "De L'Influence de la Nuit sur les Maladies ou Traité des Maladies Nocturne". In his book he concentrated on the following questions: - Does the night has an influence on a disease? - Are there diseases in which this is more or less obvious? - What is the physical background of this influence? Murat described in detail certain diseases which dominate at night and he concluded that the most evident motivation for his observations is the constant and periodic movement of the earth around its axis, resulting in a period of about 24 h, and the elliptic rotation around the sun. Read More

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http://dx.doi.org/10.1080/07420528.2019.1583669DOI Listing
February 2019

Gestational jet lag predisposes to later-life skeletal and cardiac disease.

Chronobiol Int 2019 Feb 22:1-15. Epub 2019 Feb 22.

a Department of Molecular Genetics , University Medical Center Rotterdam , Rotterdam , The Netherlands.

Circadian rhythm disturbance (CRD) increases the risk of disease, e.g. metabolic syndrome, cardiovascular disease, and cancer. Read More

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http://dx.doi.org/10.1080/07420528.2019.1579734DOI Listing
February 2019

Sleep duration and social jetlag are independently associated with anxious symptoms in adolescents.

Chronobiol Int 2019 Apr 20;36(4):461-469. Epub 2019 Feb 20.

a Department of Biobehavioral Health , College of Health and Human Development, Pennsylvania State University, University Park , PA , USA.

Although short total sleep time (TST) is associated with increased anxious symptoms in adolescents, it is unknown whether social jetlag, a misalignment between sleep timing on the weekend and school week, is independently associated with anxious symptoms. In the current study, sleep timing, anxious symptoms, and demographic information were assessed from 3097 adolescents (48% female, mean ± SD age 15.59 ± . Read More

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http://dx.doi.org/10.1080/07420528.2018.1509079DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6397070PMC
April 2019
1 Read

Mindfulness and self-compassion along the chronotype: a cross-sectional study.

Chronobiol Int 2019 Apr 18;36(4):541-547. Epub 2019 Feb 18.

a Education and Psychology , University of Aveiro , Aveiro , Portugal.

It is well established in the literature that morning-type individuals present better health indicators than evening-types. Mindfulness is considered an adaptive self-regulation skill associated with well-being and physical and mental health. However, there is scarce studies that relate chronotype and mindfulness. Read More

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http://dx.doi.org/10.1080/07420528.2018.1564323DOI Listing

Athletes' rest-activity circadian rhythm differs in accordance with the sport discipline.

Chronobiol Int 2019 Apr 14;36(4):578-586. Epub 2019 Feb 14.

a IRCCS Istituto Ortopedico Galeazzi , Milan , Italy.

The correct expression of circadian rhythmicity is crucial for the body homeostasis. The rest-activity circadian rhythms (RARs) are involved in the control of the sleep-wake cycle and altered RARs could lead to a compromised health status. Many studies focused on examining sleep behavior and circadian rhythms in physically active subjects or athletes but, unexpectedly, no data on RARs are available. Read More

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http://dx.doi.org/10.1080/07420528.2019.1569673DOI Listing

Epigenetic modification in 4T1 mouse breast cancer model by artificial light at night and melatonin - the role of DNA-methyltransferase.

Chronobiol Int 2019 Feb 12:1-15. Epub 2019 Feb 12.

b The Israeli Center for Interdisciplinary Research in Chronobiology , University of Haifa , Haifa , Israel.

Currently, one of the most disputed hypotheses regarding breast cancer (BC) development is exposure to short wavelength artificial light at night (ALAN) as multiple studies suggest a possible link between them. This link is suggested to be mediated by nocturnal melatonin suppression that plays an integral role in circadian regulations including cell division. The objective of the research was to evaluate effects of 1 × 30 min/midnight ALAN (134 µ Wcm, 460 nm) with or without nocturnal melatonin supplement on tumor development and epigenetic responses in 4T1 tumor-bearing BALB/c mice. Read More

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http://dx.doi.org/10.1080/07420528.2019.1574265DOI Listing
February 2019
1 Read

The relationship between night work, chronotype, and cardiometabolic risk factors in female hospital employees.

Chronobiol Int 2019 Feb 7:1-13. Epub 2019 Feb 7.

a Department of Public Health Sciences , Queen's University , Kingston , Ontario , Canada.

Night work has emerged as a risk factor for many chronic diseases, including obesity, diabetes, and cardiovascular disease. While night work is linked to a number of cardiometabolic indices, few studies have explored how different parameters, such as cumulative night work and intensity of night work, may influence cardiometabolic risk. Fewer studies have also explored the relationship while considering chronotype, a potential modifier between shift-induced circadian disruption and cardiometabolic outcomes. Read More

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http://dx.doi.org/10.1080/07420528.2019.1570247DOI Listing
February 2019
1 Read

Systemic oscillator-driven and nutrient-responsive hormonal regulation of daily expression rhythms for gluconeogenic enzyme genes in the mouse liver.

Chronobiol Int 2019 Feb 3:1-25. Epub 2019 Feb 3.

a Department of Biochemistry and Genetics , Chiba University Graduate School of Medicine , Chiba , Japan.

Gluconeogenesis is de novo glucose synthesis from substrates such as amino acids and is vital when glucose is lacking in the diurnal nutritional fluctuation. Accordingly, genes for hepatic gluconeogenic enzymes exhibit daily expression rhythms, whose detailed regulations under nutritional variations remain elusive. As a first step, we performed general systematic characterization of daily expression profiles of gluconeogenic enzyme genes for phosphoenolpyruvate carboxykinase (PEPCK), cytosolic form (Pck1), glucose-6-phosphatase (G6Pase), catalytic subunit (G6pc), and tyrosine aminotransferase (TAT) (Tat) in the mouse liver. Read More

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http://dx.doi.org/10.1080/07420528.2019.1570246DOI Listing
February 2019
1 Read

Diurnal variations of postural stability and attentional capacities in 5-6-year-old tennis players.

Chronobiol Int 2019 Apr 3;36(4):517-529. Epub 2019 Feb 3.

a Research Unit: Education, Motricity, Sports and Health, (EM2S, UR15JS01), High Institute of Sport and Physical Education, Sfax , Sfax University , Sfax , Tunisia.

The present study aimed to investigate the diurnal variation of postural stability, attentional capacities, and oral temperature in 5-6-year-old tennis players. A total of 24 young children were divided into two groups: Twelve tennis players with 2 years of training experience and twelve sedentary children without previous experience in any type of sport. They were asked to maintain an upright bipedal stance on a static force platform with eyes open (EO) and eyes closed (EC) at 07:00, 10:00, 14:00, and 18:00 h. Read More

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http://dx.doi.org/10.1080/07420528.2018.1564321DOI Listing
April 2019
1 Read

The effects of time of day-specific resistance training on adaptations in skeletal muscle hypertrophy and muscle strength: A systematic review and meta-analysis.

Chronobiol Int 2019 Apr 31;36(4):449-460. Epub 2019 Jan 31.

d Faculty of Kinesiology , University of Zagreb , Zagreb , Croatia.

The present paper endeavored to elucidate the topic on the effects of morning versus evening resistance training on muscle strength and hypertrophy by conducting a systematic review and a meta-analysis of studies that examined time of day-specific resistance training. This systematic review was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines with searches conducted through PubMed/MEDLINE, Scopus, and SPORTDiscus databases. The Downs and Black checklist was used for the assessment of the methodological quality of the included studies. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2019.1
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http://dx.doi.org/10.1080/07420528.2019.1567524DOI Listing
April 2019
20 Reads

Sinoatrial node remodels in chronic sleep-restricted rats.

Chronobiol Int 2019 Apr 24;36(4):510-516. Epub 2019 Jan 24.

a Histomorphometry and Stereology Research Center , Shiraz University of Medical Sciences , Shiraz , Iran.

Chronic Sleep Restriction (CSR) is known as a risk factor for cardiovascular diseases. However, the structural changes of Sinoatrial (SA) node cells have received less attention. This study aimed to evaluate the effects of CSR on SA node in an animal model using stereological methods. Read More

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http://dx.doi.org/10.1080/07420528.2018.1563900DOI Listing
April 2019
1 Read

Effect of pinealectomy on the circadian clock of the chick retina under different monochromatic lights.

Chronobiol Int 2019 Apr 21;36(4):548-563. Epub 2019 Jan 21.

a Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Animal Medicine , China Agricultural University , Beijing , China.

The avian circadian rhythm pacemaker is composed of the retina, pineal gland and suprachiasmatic nucleus. As an intact input-pacemaker-output system, each of these structures is linked within a neuroendocrine loop to influence downstream processes and peripheral oscillations. While our previous study found that monochromatic light affected the circadian rhythms of clock genes in the chick retina, the effect of the pineal gland on the response of the retinal circadian clock under monochromatic light still remains unclear. Read More

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http://dx.doi.org/10.1080/07420528.2019.1566740DOI Listing
April 2019
1 Read

Relationships between chronotype, social jetlag, sleep, obesity and blood pressure in healthy young adults.

Chronobiol Int 2019 Apr 21;36(4):493-509. Epub 2019 Jan 21.

a Department of Epidemiology and Biostatistics , University of South Carolina , Columbia , South Carolina , USA.

Sleep disturbances, chronotype and social jetlag (SJL) have been associated with increased risks for major chronic diseases that take decades to develop, such as obesity, metabolic syndrome and cardiovascular disease. Potential relationships between poor sleep, chronotype and SJL as they relate to metabolic risk factors for chronic disease have not been extensively investigated. This prospective study examined chronotype, SJL and poor sleep in relation to both obesity and elevated blood pressure among healthy young adults. Read More

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http://dx.doi.org/10.1080/07420528.2018.1563094DOI Listing
April 2019
1 Read

Progressive retinal ganglion cell loss in primary open-angle glaucoma is associated with temperature circadian rhythm phase delay and compromised sleep.

Chronobiol Int 2019 Apr 21;36(4):564-577. Epub 2019 Jan 21.

g Institute of Biology/Zoology , Martin Luther University , Halle-Wittenberg , Germany.

Advanced primary open-angle glaucoma (POAG) is characterized by progressive retinal ganglion cell complex (RGCC) damage that may cause subsequent disruption of the circadian rhythms. Therefore, we evaluated circadian body temperature (BT) rhythm and sleep characteristics of 115 individuals (38 men and 77 women) diagnosed with POAG. GLV (global loss volume; %), a measure of RGCC damage, was estimated by high-definition optical coherence tomography, and RGC functional ability was assessed by pattern electroretinogram amplitude (PERGA). Read More

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http://dx.doi.org/10.1080/07420528.2019.1566741DOI Listing
April 2019
1 Read

Effects of two nights partial sleep deprivation on an evening submaximal weightlifting performance; are 1 h powernaps useful on the day of competition?

Chronobiol Int 2019 Mar 10;36(3):407-426. Epub 2019 Jan 10.

a Research Institute for Sport and Exercise Sciences , Liverpool John Moores University , Liverpool , UK.

We have investigated the effects that sleep restriction (3-h sleep during two consecutive nights) have on an evening (17:00 h) submaximal weightlifting session; and whether this performance improves following a 1-h post-lunch powernap. Fifteen resistance-trained males participated in this study. Before the experimental protocol commenced, 1RM bench press and inclined leg press and normative habitual sleep were recorded. Read More

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http://dx.doi.org/10.1080/07420528.2018.1552702DOI Listing
March 2019
1 Read

The fetal circadian rhythm in pregnancies complicated by pregestational diabetes is altered by maternal glycemic control and the morning cortisol concentration.

Chronobiol Int 2019 Apr 8;36(4):481-492. Epub 2019 Jan 8.

a Department of Clinical Science , University of Bergen , Bergen , Norway.

Circadian rhythmicity is fundamental to human physiology, and is present even during fetal life in normal pregnancies. The impact of maternal endocrine disease on the fetal circadian rhythm is not well understood. The present study aimed to determine the fetal circadian rhythm in pregnancies complicated by pregestational diabetes mellitus (PGDM), compare it with a low-risk reference population, and identify the effects of maternal glycemic control and morning cortisol concentrations. Read More

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http://dx.doi.org/10.1080/07420528.2018.1561460DOI Listing
April 2019
1 Read

Rhythmic changes in Fabry disease: Inversion and non-oscillatory pattern in 6-sulfatoxymelatonin daily profile.

Chronobiol Int 2019 Apr 7;36(4):470-480. Epub 2019 Jan 7.

a Department of Psychobiology , Universidade Federal de Sao Paulo , Sao Paulo , Brazil.

Fabry disease is a progressive disease characterized by an enzymatic deficiency of acid alpha-galactosidase and glycosphingolipids storage within the lysosomes. The disease has two phenotypes: classic and nonclassic. Excessive daytime sleepiness is a common sign reported by patients and can be caused by a circadian rhythm sleep disorder. Read More

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http://dx.doi.org/10.1080/07420528.2018.1560308DOI Listing
April 2019
1 Read

Adaptation of the Morningness-Eveningness Stability Scale improved (MESSi) into Turkish.

Chronobiol Int 2019 Mar 7;36(3):427-438. Epub 2019 Jan 7.

b Faculty of Education, Department of Mathematics and Science Education , Sakarya University , Turkey.

Morningness-eveningness is an individual difference that is related with various traits such as behavioral problems, personality, and health. The aim of the current study is to adopt the Morningness-Eveningness Stability Scale improved (MESSi) which is a novel assessment tool that consists of subscales of morning affect (MA), eveningness (EV), and distinctness (DI) into Turkish. Concurrent validity of the MESSi along with Big five inventory (BIG-5), Subjective alertness level, Pittsburg Sleep Quality Index (PSQI), Positive and Negative Affect Schedule (PANAS) were analyzed. Read More

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http://dx.doi.org/10.1080/07420528.2018.1560307DOI Listing
March 2019
1 Read

The reduced Morningness-Eveningness Questionnaire: Psychometric properties and related factors in a young Swedish population.

Chronobiol Int 2019 Apr 7;36(4):530-540. Epub 2019 Jan 7.

b Centre for Psychiatry Research, Department of Clinical Neuroscience , Karolinska Institute , Stockholm , Sweden.

During puberty, there is a delay in sleep patterns and the circadian clock, and the prevalence of sleep difficulties is high among young adults. Thus, it is important to be able to measure chronotype (CT) in this group, both in the clinic and for broader epidemiological studies, to better understand the sleep difficulties observed. The reduced version of one of the most widely used questionnaire to measure CT, the Horne & Östberg Morningness-Eveningness Questionnaire (MEQ), has been developed and validated in many languages. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1564322DOI Listing
April 2019
3 Reads

Effects of an active warm-up on variation in bench press and back squat (upper and lower body measures).

Chronobiol Int 2019 Mar 26;36(3):392-406. Epub 2018 Dec 26.

a Research Institute for Sport and Exercise Sciences , Liverpool John Moores University , Liverpool , UK.

The present study investigated the magnitude of diurnal variation in back squat and bench press using the MuscleLab linear encoder over three different loads and assessed the benefit of an active warm-up to establish whether diurnal variation could be negated. Ten resistance-trained males underwent (mean ± SD: age 21.0 ± 1. Read More

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http://dx.doi.org/10.1080/07420528.2018.1552596DOI Listing
March 2019
1 Read

Is Santa Claus an evening owl?

Chronobiol Int 2019 Apr 21;36(4):445-448. Epub 2018 Dec 21.

a Department of Biology , Eberhard Karls University Tübingen , Tübingen , Germany.

Case studies have a long tradition in biomedical research. Here, I will analyze an important person from a chronobiological aspect, Santa Claus. Although it might be dangerous for researchers to publish analyses about Santa Claus, because, given the possibility that he may be unsatisfied with my analysis, this could lead to an embargo of parcels for my whole family. Read More

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http://dx.doi.org/10.1080/07420528.2018.1553886DOI Listing
April 2019
1 Read

The physiologist Johann Autenrieth (1772-1835) at Tübingen University: early reports on biological rhythms and their use for medical lectures.

Authors:
Björn Lemmer

Chronobiol Int 2019 Mar 21;36(3):304-306. Epub 2018 Dec 21.

a Experimental Pharmacology , Ruprecht-Karls-University of Heidelberg , Mannheim , Germany.

Johann, Heinrich, Ferdinand von Autenrieth [1772-1835], was a teacher of anatomy, physiology and pharmacology at the University of Tübingen, Germany. He was the author of a famous textbook on Physiology and one of the earliest pharmacologists [Öffentlicher Lehrer der Arzneykunst]. In his textbooks, he presented a lot of information that and how biological rhythms influenced physiological functions in the human body, the book was used for his medical lectures for students. Read More

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http://dx.doi.org/10.1080/07420528.2018.1550653DOI Listing
March 2019
1 Read

Diurnal variation of metabolites in three individual participants.

Chronobiol Int 2019 Mar 17;36(3):332-342. Epub 2018 Dec 17.

b Division of Cancer Epidemiology and Genetics , National Cancer Institute , Rockville , MD , USA.

The circadian system influences virtually all biological functions. Understanding the impact of circadian variation on metabolism may provide insight into mechanisms of circadian-associated disorders and guide the implementation of chrono-therapy. Previous research has reported circadian variation in 7-20% of metabolites in human blood. Read More

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http://dx.doi.org/10.1080/07420528.2018.1541901DOI Listing
March 2019
3 Reads

Several clock genes polymorphisms are meaningful risk factors in the development and severity of cannabis addiction.

Chronobiol Int 2019 Jan 11;36(1):122-134. Epub 2018 Dec 11.

a Dpt Biochimie et Oncogénétique, plate-forme Oncomolpath/INCa - F94800 , AP-HP, GH Paris-Sud, Hôpital Paul Brousse , Villejuif , France.

Circadian rhythms have been related to psychiatric diseases and regulation of dopaminergic transmission, especially in substance abusers. The relationship between them remained enigmatic and no data on the role of clock genes on cannabis dependence have been documented. We aimed at exploring the role of clock gene genotypes as potential predisposing factor to cannabis addiction, using a high throughput mass spectrometry methodology that enables the large-scale analysis of the known relevant polymorphisms of the clock genes. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1523797DOI Listing
January 2019
4 Reads

The influence of short-term sedentary behavior on circadian rhythm of heart rate and heart rate variability.

Chronobiol Int 2019 Mar 3;36(3):374-380. Epub 2018 Dec 3.

c Graduate School of Health Sciences, Preventive medicine , Kobe University , Kobe , Japan.

The notion that sedentary behavior is harmful to human health is widespread. Little is known about the short term influence of sedentary behavior on heart rate (HR) and heart rate variability (HRV) circadian rhythms. Therefore the purpose of the present study was to examine the influence of short term sedentary behavior on the circadian rhythms of HR and HRV using cosine periodic regression analysis. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1550422DOI Listing
March 2019
10 Reads

Biological rhythm and emotional and behavioral problems among schoolchildren in Southern Brazil.

Chronobiol Int 2019 Mar 3;36(3):353-359. Epub 2018 Dec 3.

a Health and Behavior , Universidade Católica de Pelotas , Pelotas , Brazil.

Emotional and behavioral problems have been considered an indicative of mental disorder in children. Mental health problems affect 10-20% of children and adolescents living in low-income and middle-income countries. Evidence suggests that disruptions in the biological rhythm may be a primary cause of emotional and behavioral changes, which affects several psychological functions and moods. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1545781DOI Listing
March 2019
17 Reads

Chronotype and beyond: 17 building blocks to reconcile and explore internal time architecture.

Chronobiol Int 2019 Mar 4;36(3):299-303. Epub 2018 Dec 4.

a Institute and Policlinic for Occupational Medicine, Environmental Medicine and Prevention Research , University Hospital of Cologne , Cologne , Germany.

Chronotype, defined as the temporal phenotype of an organism, has been addressed in Chronobiology International in some 200 publications between 1997 and 2018. Readers may thus be interested in what roles chronotype may play in studies concerning chronobiology and health. In line with Karl Popper, our objective is to synthesize terms and concepts for falsifiable experimental, field, and ultimately epidemiological research. Read More

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http://dx.doi.org/10.1080/07420528.2018.1549564DOI Listing
March 2019
1 Read

Resilience, sleep quality and morningness as mediators of vulnerability to depression in medical students with sleep pattern alterations.

Chronobiol Int 2019 Mar 4;36(3):381-391. Epub 2018 Dec 4.

d Department of Medical Internship, Faculty of Medicine , Universidad Nacional Autónoma de México, Mexico City, Mexico.

The medical career is considered highly stressful, especially during internships when academic and clinical demands, combined with changes in sleep patterns, increase students' likelihood to develop depression. Resilience, which is considered as opposite vulnerability to stress and, along with another protective factor, namely morningness, may cause a student to be less reactive to stimuli and, therefore, less prone to depression. The objective of this study was to evaluate the role of resilience and morningness facing to sleep quality and main risk factors, on the development of depression symptoms in a group of students with sleep pattern alterations. Read More

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http://dx.doi.org/10.1080/07420528.2018.1552290DOI Listing
March 2019
1 Read

Circadian and homeostatic modulation of the attentional blink.

Chronobiol Int 2019 Mar 29;36(3):343-352. Epub 2018 Nov 29.

a Laboratorio de Psicofisiología, Facultad de Psicología , Universidad Autónoma de Nuevo León , Monterrey, NL , México.

An important property of attention is the limitation to process new information after responding to a stimulus. This property of attention can be evaluated by the Attentional Blink (AB), a phenomenon that consists of a failure to detect the second of two targets when the interval between them is 200-500 ms. The aim of the present work is to determine the possible existence of time awake (homeostatic changes) and time of day (circadian rhythm) variations in the AB. Read More

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http://dx.doi.org/10.1080/07420528.2018.1543315DOI Listing
March 2019
1 Read

Sleep patterns and nocturnal cardiac autonomic activity in female athletes are affected by the timing of exercise and match location.

Chronobiol Int 2019 Mar 18;36(3):360-373. Epub 2018 Nov 18.

a Centre of Research, Education, Innovation and Intervention in Sport , University of Porto , Porto , Portugal.

The aim of the current study was to analyze the influence of the timing of training and matches, and match location, on sleep pattern and nocturnal cardiac autonomic activity in female soccer players. A total of 17 female soccer players (age: 21.6 ± 2. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1545782DOI Listing
March 2019
10 Reads

Short sleep and late bedtimes are detrimental to educational learning and knowledge transfer: An investigation of individual differences in susceptibility.

Chronobiol Int 2019 Mar 8;36(3):307-318. Epub 2018 Nov 8.

a Department of Psychology and Neuroscience , Baylor University , Waco , USA.

Good sleep hygiene practices, including consistent bedtimes and 7-9 h of sleep/night, are theorized to benefit educational learning. However, individuals differ in how much sleep they need, as well as in their chronotype preference. Therefore, some students may be more vulnerable to the cognitive effects of sleep loss, later bedtimes and nonpreferred times of learning than others. Read More

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http://dx.doi.org/10.1080/07420528.2018.1539401DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6377305PMC
March 2019
1 Read

Eveningness diurnal preference associated with poorer socioemotional cognition and social functioning among healthy adolescents and young adults.

Chronobiol Int 2019 Mar 8;36(3):439-444. Epub 2018 Nov 8.

b Department of Psychology , Northwestern University , Evanston , IL , USA.

Recently there has been growing interest in associations between sleep, emotion, and social functioning. Less is known about relationships between chronotype preference and socioemotional cognition and functioning, particularly among adolescents, who experience dramatic normative shifts in diurnal preference, affective functioning, and social competence. Fifty-five healthy adolescents and young adults completed a self-report chronotype preference measure, a computerized measure of socioemotional cognition, and a semi-structured clinical interview assessing interpersonal functioning. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1538156DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6377298PMC
March 2019
13 Reads

Shift work and sex are variants across Karolinska Sleep Questionnaire and the application of linking analysis as a step forward using Item Response Theory.

Chronobiol Int 2019 Jan 7;36(1):42-56. Epub 2018 Nov 7.

a School of Public Health , São Paulo University , Brazil.

The frequency of sleep disturbances is considerably higher in the night and shift workers and in females than in day workers and males, respectively. However, a subjective sleep scale must be invariant across these groups, independently of the level of their members on the scale. This study is aimed to test the invariance of the Karolinska Sleep Questionnaire's (KSQ) items by shift work and sex. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1515773DOI Listing
January 2019
14 Reads

Altered expression of the core circadian clock component PERIOD2 contributes to osteoarthritis-like changes in chondrocyte activity.

Chronobiol Int 2019 Mar 7;36(3):319-331. Epub 2018 Nov 7.

a Department of Medicine , School of Medicine, University of Auckland , Auckland , New Zealand.

In osteoarthritis, chondrocytes undergo a phenotype shift characterised by reduced expression of SOX9 (sry-box 9) and increased production of cartilage-degrading enzymes, e.g. MMP13 (matrix metalloproteinase 13) and ADAMTS5 (a disintegrin and metalloproteinase with thrombospondin motifs 5). Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1540493DOI Listing
March 2019
10 Reads

Social jetlag and menstrual symptoms among female university students.

Chronobiol Int 2019 Feb 5;36(2):258-264. Epub 2018 Nov 5.

b Laboratory of Physiology and Pharmacology, School of Advanced Science and Engineering , Waseda University , Tokyo , Japan.

Menstrual symptoms may have a significant impact on women's lives. Many women experience menses-related health problems, such as menstrual pain, heavy menstrual bleeding, and premenstrual syndrome, during their reproductively fertile years. Circadian misalignment in shift workers has been reported to contribute to menstrual cycle irregularity and/or painful menstruation. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1533561DOI Listing
February 2019
10 Reads

Mood rhythmicity is associated with depressive symptoms and caffeinated drinks consumption in South American young adults.

Chronobiol Int 2019 Feb 5;36(2):225-236. Epub 2018 Nov 5.

d School of Medicine , Universidad de Ciencias Aplicadas y Ambientales. U.D.C.A , Bogotá , Colombia.

Among the factors that contribute to the onset and maintenance of depressive disorders, rhythmicity of symptoms and consumption of caffeine have recently gained attention. The current study aimed to examine the differential rhythmicity of relevant variables in a sample of young participants, considering the presence of depressive symptomatology and the frequency of caffeinated drinks consumption. A significant 24-hour differential rhythmicity of mood, cognitive and physiological variables was found indicating an evening peak pattern in the participants with depressive symptoms. Read More

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http://dx.doi.org/10.1080/07420528.2018.1530257DOI Listing
February 2019
1 Read

A psychometric investigation of the sleep, circadian rhythms, and mood (SCRAM) questionnaire.

Chronobiol Int 2019 Feb 5;36(2):265-275. Epub 2018 Nov 5.

a Centre for Mental Health , Swinburne University of Technology , Hawthorn , Australia.

The sleep, circadian rhythms, and mood (SCRAM) questionnaire (Byrne, Bullock et al., 2017) was designed to concurrently measure individual differences in three clinically important functions: diurnal preference, sleep quality, and mood. The 15-item questionnaire consists of three 5-item scales named Morningness, Good Sleep, and Depressed Mood. Read More

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http://dx.doi.org/10.1080/07420528.2018.1533850DOI Listing
February 2019
1 Read

Nurses who work rotating shifts consume more energy, macronutrients and calcium when they work the night shift versus day shift.

Chronobiol Int 2019 Feb 5;36(2):288-295. Epub 2018 Nov 5.

b Department of Nutrition Sciences, School of Health Sciences , Ariel University , Ariel , Israel.

Background: Shift work has been associated with increased body mass index (BMI), metabolic disruption and increased chronic disease risk. Typically, these reports compare individuals who work the day shift to those who work the night shift. Because shift assignment is not random, differences may reflect other, unmeasured characteristics that account for outcome differences. Read More

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http://dx.doi.org/10.1080/07420528.2018.1538155DOI Listing
February 2019
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Daily rhythms of leukocytes populations, biochemical and enzymatic blood parameters in a carnivorous freshwater catfish (Lophiosilurus alexandri).

Chronobiol Int 2019 Feb 29;36(2):276-287. Epub 2018 Oct 29.

c Departmento de Zootecnia , Laboratório de Aquicultura , Belo Horizonte , Brazil.

The aim of this study was to investigate the daily rhythms of hematological, biochemical and enzymatic parameters of the blood of a nocturnal model of fish (Lophiosilurus alexandri) bred in the laboratory (F1). Thirty-six juveniles were stocked in six tanks of a recirculation aquaculture system for 20 days. The fish were exposed to a light:dark cycle of 12:12 h and were fed 1% of biomass twice a day with commercial diet. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1537284DOI Listing
February 2019
11 Reads

Zeitgebers and their association with rest-activity patterns.

Chronobiol Int 2019 Feb 26;36(2):203-213. Epub 2018 Oct 26.

b Division of Sleep and Circadian Disorders, Department of Medicine , Brigham & Women's Hospital & Harvard Medical School , Boston MA.

Zeitgebers such as light, eating and physical activity provide input to the circadian clock. Chronic circadian misalignment is associated with significant adverse health effects. An improved understanding of the impact of the timing of zeitgebers on the stability of 24-hour rest-activity rhythm in free-living settings may identify behavioural and environmental intervention targets. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1527347DOI Listing
February 2019
15 Reads

Daily expression of clock genes in central and peripheral tissues of tree sparrow (Passer montanus).

Chronobiol Int 2019 Jan 26;36(1):110-121. Epub 2018 Oct 26.

a Department of Zoology , Mizoram University , Aizawl , Mizoram , India.

Almost all organisms live in a fluctuating environment. To achieve synchrony with the fluctuating environment, organisms have evolved with time-tracking mechanism commonly known as biological clocks. This circadian clock machinery has been identified in almost all cells of vertebrates and categorized as central and peripheral clocks. Read More

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http://dx.doi.org/10.1080/07420528.2018.1523185DOI Listing
January 2019
2 Reads

Seasonal variations of changes in lipid and glucidic variables after bariatric surgery.

Chronobiol Int 2019 Feb 23;36(2):250-257. Epub 2018 Oct 23.

b Department of Biochemistry and Molecular Biomedicine, Biology Faculty , Barcelona University , Barcelona , Spain.

Seasonality is a phenomenon that is characterized by changes over the year in sleep, mood, behaviour, appetite and body weight. In humans, seasonal variations have been found in certain variables, such as lipid variables and body mass index. We hypothesize that this rhythm could influence the expected variation of the levels of biochemical variables in cases of body weight loss. Read More

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http://dx.doi.org/10.1080/07420528.2018.1533560DOI Listing
February 2019
9 Reads

The loss of ecosystem-services emerging from artificial light at night.

Chronobiol Int 2019 Feb 19;36(2):296-298. Epub 2018 Oct 19.

a The Israeli Centre for Interdisciplinary Research in Chronobiology , University Haifa , Haifa , Israel.

Light pollution is increasing worldwide, affecting human health and ecosystem quality. The adverse effect of this novel pollution, mediated in mammals by suppression of the pineal neuro-hormone melatonin production and secretion, particularly by short wavelength (SWL) illumination. Currently, this problem is not challenged sufficiently, even ignored by decision-makers at local and national levels, as well as other related organizations. Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1534122DOI Listing
February 2019
15 Reads

Effects of chronotype and time of day on mood responses to CrossFit training.

Chronobiol Int 2019 Feb 19;36(2):237-249. Epub 2018 Oct 19.

a Faculty of Psychology , University of Warsaw , Warsaw , Poland.

Morningness-eveningness, time of day, and physical exercises have been shown to influence mood states. This study aimed to test whether impact of physical exercise on mood depends on time of day and chronotype. Ninety-four participants (age 32 ± 6 years; 34% females; weekly training volume 4 ± 1 hours) filled the Composite Scale of Morningness and reported their current mood using the UWIST Mood Adjective Checklist before and after a 60-min long CrossFit training session which took part in the morning (beginning at 6:30 or 7:45) or in the evening (beginning at 19:30 or 20:45). Read More

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https://www.tandfonline.com/doi/full/10.1080/07420528.2018.1
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http://dx.doi.org/10.1080/07420528.2018.1531016DOI Listing
February 2019
18 Reads