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    2599 results match your criteria Chronobiology International [Journal]

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    Shift work and sleep disorder comorbidity tend to go hand in hand.
    Chronobiol Int 2017 Nov 20:1-10. Epub 2017 Nov 20.
    a Department of Psychology , University of Amsterdam , Amsterdam , The Netherlands.
    Taking into consideration that shift work has a wide-ranging impact on circadian and sleep functioning, it seems likely that shift work increases the risk of a general sleep disturbance, spread out over a multitude of comorbid sleep disorders. The aim of the present study is to analyze and present the sleep disorder data of 250 shift workers and 971 permanent day workers, taken from a nationally representative sample. Additional data concerning duration, timing, and quality of sleep, daytime functioning and social/family variables were added to the analyses. Read More

    Chronotype description: In search of a solid subjective amplitude scale.
    Chronobiol Int 2017 Nov 20:1-13. Epub 2017 Nov 20.
    b Vrije Universiteit Brussel, Faculty of Psychology and Educational Sciences , Department of Experimental and Applied Psychology , Brussels , Belgium.
    The term "subjective circadian amplitude" refers to the range or the distinctness of diurnal variations of arousal, that is, the awareness (or lack thereof) of difference between hyper- and hypo-activation phases, the ability to volitionally modulate one's own psychophysiological state, the strength of morning-evening preferences and flexibility of the rhythm or perceived stability of the circadian phase. The complexity of this construct is the source of difficulties in research and measurement. The psychometric features of distinctness subscales of the Chronotype Questionnaire and the Caen Chronotype Questionnaire are not satisfactory. Read More

    Effects of circadian clock protein Per1b on zebrafish visual functions.
    Chronobiol Int 2017 Nov 20:1-9. Epub 2017 Nov 20.
    a Chinese Academy of Sciences Key Laboratory of Brain Function and Disease, School of Life Sciences , University of Science and Technology of China , Hefei , Anhui Province , P. R. China.
    The circadian clock is an endogenous and entrainable time-keeping mechanism with a period of approximately 24 h, operated by transcription/translation feedback loops composed of circadian clock genes and their proteins. The visual system displays robust circadian changes. Relatively little, however, is known about the mechanisms underlying visual circadian rhythmicity. Read More

    Circadian phase, circadian period and chronotype are reproducible over months.
    Chronobiol Int 2017 Nov 17:1-9. Epub 2017 Nov 17.
    c Biological Rhythms Research Lab , Rush University Medical Center , Chicago , IL 60612 , USA.
    The timing of the circadian clock, circadian period and chronotype varies among individuals. To date, not much is known about how these parameters vary over time in an individual. We performed an analysis of the following five common circadian clock and chronotype measures: 1) the dim light melatonin onset (DLMO, a measure of circadian phase), 2) phase angle of entrainment (the phase the circadian clock assumes within the 24-h day, measured here as the interval between DLMO and bedtime/dark onset), 3) free-running circadian period (tau) from an ultradian forced desynchrony protocol (tau influences circadian phase and phase angle of entrainment), 4) mid-sleep on work-free days (MSF from the Munich ChronoType Questionnaire; MCTQ) and 5) the score from the Morningness-Eveningness Questionnaire (MEQ). Read More

    Rest-activity circadian rhythm and sleep quality in patients with binge eating disorder.
    Chronobiol Int 2017 Nov 16:1-10. Epub 2017 Nov 16.
    a Department of Biomedical Sciences for Health , University of Milan , Milan , Italy.
    Recent findings suggest that altered rest-activity circadian rhythms (RARs) are associated with a compromised health status. RARs abnormalities have been observed also in several pathological conditions, such as cardiovascular, neurological, and cancer diseases. Binge eating disorder (BED) is the most common eating disorder, with a prevalence of 3. Read More

    Age and rest-activity rhythm as predictors of survival in patients with newly diagnosed lung cancer.
    Chronobiol Int 2017 Nov 16:1-10. Epub 2017 Nov 16.
    b School of Nursing, College of Nursing, Taipei Medical University , Taipei , Taiwan.
    Disruption of the rest-activity rhythm in patients with lung cancer can accelerate cancer progression and affect survival. Rest-activity rhythm changes with age. Therefore, we investigated the effects of rest-activity rhythm and age on patients' survival. Read More

    Influence of a dosing-time on toxicities induced by docetaxel, cisplatin and 5-fluorouracil in patients with oral squamous cell carcinoma; a cross-over pilot study.
    Chronobiol Int 2017 Nov 16:1-6. Epub 2017 Nov 16.
    c Division of Clinical Pharmacology, Department of Pharmacology , Jichi Medical University , Tochigi , Japan.
    Docetaxel, cisplatin plus fluorouracil (DCF) regimen is a useful chemotherapy, but is sometimes withdrawn due to severe adverse effects (AE). In this study, we examined whether the chronotherapy of DCF regimen could reduce the drugs-induced toxicities in clinical practice. Patients with oral squamous cell carcinoma were enrolled. Read More

    Chronotype regulates the neural basis of response inhibition during the daytime.
    Chronobiol Int 2017 Nov 16:1-11. Epub 2017 Nov 16.
    a Key Laboratory of Cognition and Personality (MOE), Southwest University , Chongqing , China.
    Studies have elucidated the various modulatory effects of chronotype and time-of-day on task-dependent brain activity, but it is unclear how chronotype and time-of-day regulate brain activity in response inhibition tasks. To address this question, we used functional magnetic resonance imaging (fMRI) to explore the effects of chronotype and time-of-day on response inhibition in normal day-night conditions. Morning-type (MT) and evening-type (ET) participants conducted the stop-signal task in morning (08:00-12:00 hours) and evening (19:00-23:00 hours) sessions. Read More

    Disruptions in sleep-wake cycles in community-dwelling cancer patients receiving palliative care and their correlates.
    Chronobiol Int 2017 Nov 16:1-14. Epub 2017 Nov 16.
    c Laval University Cancer Research Center , Quebec City, Quebec, Canada.
    Significant disruptions in sleep-wake cycles have been found in advanced cancer patients in prior research. However, much remains to be known about specific sleep-wake cycle variables that are impaired in patients with a significantly altered performance status. More studies are also needed to explore the extent to which disrupted sleep-wake cycles are related to physical and psychological symptoms, time to death, maladaptive sleep behaviors, quality of life and 24-h light exposure. Read More

    Circadian gene methylation in rotating-shift nurses: a cross-sectional study.
    Chronobiol Int 2017 Nov 16:1-11. Epub 2017 Nov 16.
    b Department of Environmental Epidemiology , Nofer Institute of Occupational Medicine , Lodz , Poland.
    Investigating the methylation status of the circadian genes may contribute to a better understanding of the shift work-related circadian disruption in individuals exposed to artificial light at night. In the present study, we determined the methylation status of the circadian genes associated with a shift work pattern among nurses and midwives participating in a cross-sectional study in Lodz, Poland. Quantitative methylation polymerase chain reaction assays were used to assess promoter CpG methylation in PER1, PER2, PER3, CRY1, CRY2, BMAL1, CLOCK, and NPAS2 in genomic DNA from whole blood of 347 women having a rotating-shift work schedule and 363 women working days only. Read More

    Night work as a risk factor for future cause-specific disability pension: A prospective twin cohort study in Sweden.
    Chronobiol Int 2017 Nov 16:1-12. Epub 2017 Nov 16.
    b Division of Insurance Medicine, Department of Clinical Neuroscience , Karolinska Institutet , Stockholm , Sweden.
    The objectives of the study were to investigate the associations between night work and disability pension (DP) due to all causes, cardiovascular (CVD), mental, and other diagnoses, adjusting for familial confounding. The material of the study included comprehensive survey data on 27 165 Swedish twins born in 1935-1958 that were linked with DP data for the survey period (1998-2003) to 2013. Night work was assessed as years of working nights at least every now and then, and categorized into not at all, 1-10 years and over 10 years. Read More

    Bright-light exposure during daytime sleeping affects nocturnal melatonin secretion after simulated night work.
    Chronobiol Int 2017 Nov 16:1-11. Epub 2017 Nov 16.
    a Kyoto university, Department of Human Health Sciences , Graduate school of Medicine , Kyoto , Japan.
    The guidelines for night and shift workers recommend that after night work, they should sleep in a dark environment during the daytime. However, staying in a dark environment during the daytime reduces nocturnal melatonin secretion and delays its onset. Daytime bright-light exposure after night work is important for melatonin synthesis the subsequent night and for maintaining the circadian rhythms. Read More

    The effects of extended nap periods on cognitive, physiological and subjective responses under simulated night shift conditions.
    Chronobiol Int 2017 Nov 16:1-19. Epub 2017 Nov 16.
    b Embedded Brains GmbH , Puchheim , Germany.
    Extended nap opportunities have been effective in maintaining alertness in the context of extended night shifts (+12 h). However, there is limited evidence of their efficacy during 8-h shifts. Thus, this study explored the effects of extended naps on cognitive, physiological and perceptual responses during four simulated, 8-h night shifts. Read More

    The influence of sunlight exposure on hospitalization in emergency psychiatry.
    Chronobiol Int 2017 Nov 16:1-10. Epub 2017 Nov 16.
    c Psychiatric Clinic, "S Luigi Gonzaga Hospital" of Orbassano - "Rita Levi Montalcini" Department of Neuroscience , University of Turin , Turin , Italy.
    Objective: Environmental conditions during early life may affect individual vulnerability to both physiological changes as well as psychiatric conditions, especially in those with a genetic susceptibility. Among all factors, sunlight exposure intensity has a crucial effect on affecting circadian functions high-risk individuals. A potential explanation of this relation is that excessive sunlight exposure is able to impair biological mechanisms, possibly through the dysregulation of serotonin and/or melatonin production/metabolism. Read More

    Proposal of cutoff points for pediatric daytime sleepiness scale to identify excessive daytime sleepiness.
    Chronobiol Int 2017 Nov 16:1-9. Epub 2017 Nov 16.
    a Center of Physical Activity and Health Research , Santa Catarina State University (UDESC) , Florianópolis , SC , Brazil.
    The objective of the present study was to propose cutoff points for the Pediatric Daytime Sleepiness Scale (PDSS) through sensitivity and specificity analyses in order to identify excessive daytime sleepiness, considering parameters such as duration and quality of sleep, health perception, stress control and depressive moods (feelings of sadness) in adolescents. A total of 1,132 adolescents, aged 14-19 years old, of both sexes, from the public high school of São José - SC, answered the questionnaire with information on age, daytime sleepiness, sleep duration, health perception, stress management, depressive moods (feelings of sadness) and quality of sleep. The Receiver Operating Characteristic (ROC) curve was used to estimate cutoff points considering the sensitivity and specificity values ​​that best identify adolescents with excessive daytime sleepiness, using independent variables as a reference. Read More

    Sleep quality and methylation status of selected tumor suppressor genes among nurses and midwives.
    Chronobiol Int 2017 Nov 16:1-10. Epub 2017 Nov 16.
    a Department of Environmental Epidemiology , Nofer Institute of Occupational Medicine , Lodz , Poland.
    Chronic sleep restriction may affect metabolism, hormone secretion patterns and inflammatory responses. Limited reports suggest also epigenetic effects, such as changes in DNA methylation profiles. The study aims to assess the potential association between poor sleep quality or sleep duration and the levels of 5-methylcytosine in the promoter regions of selected tumor suppressor genes. Read More

    Repercussions of hypo and hyperthyroidism on the heart circadian clock.
    Chronobiol Int 2017 Nov 7:1-13. Epub 2017 Nov 7.
    b Department of Physiology and Biophysics , Institute of Biomedical Sciences-I, University of São Paulo , São Paulo , Brazil.
    Myocardial gene expression and metabolism fluctuate over the course of the day in association with changes in energy supply and demand. Time-of-day-dependent oscillations in myocardial processes have been linked to the intrinsic cardiomyocyte circadian clock. Triiodothyronine (T3) is an important modulator of heart metabolism and function. Read More

    Comparing the response to acute and chronic exposure to short wavelength lighting emitted from computer screens.
    Chronobiol Int 2017 Nov 7:1-11. Epub 2017 Nov 7.
    a The Israeli Center for Interdisciplinary Research in Chronobiology, University of Haifa , Haifa , Israel.
    The use of electronic devices with light-emitting screens has increased exponentially in the last decade. As a result, humans are continuously exposed to unintentional artificial light. We explored the effects of acute and chronic exposure to artificial light at night (ALAN) via screen illumination on sleep, circadian rhythms, and related functional outcomes. Read More

    Evening chronotype and sleepiness predict impairment in executive abilities and academic performance of adolescents.
    Chronobiol Int 2017 Nov 7:1-9. Epub 2017 Nov 7.
    a School of Behavioral Sciences , The Academic College of Tel Aviv-Jaffa , Tel Aviv-Jaffa Israel.
    The study aim was to better understand sleep and sleep-related factors affecting everyday executive capacities and academic performance among healthy adolescents. A cross-sectional survey on sleep, phase preference, academic performance and executive functions of high-school students was conducted. Female gender, grade status, sleepiness and evening chronotype accounted for approximately 25-30% of the variance in daily executive ability. Read More

    Short-term effects of wake- and bright light therapy on sleep in depressed youth.
    Chronobiol Int 2017 Nov 7:1-10. Epub 2017 Nov 7.
    a LWL-University Hospital for Child and Adolescent Psychiatry and Psychotherapy, Heithofer Allee 64, Hamm , Ruhr-University Bochum , Germany.
    Chronotherapeutics are well established for the treatment of depression and associated sleeping problems in adults. However, effects are still understudied in adolescents. Two pilot studies highlighted the crucial role of sleep when it comes to the treatment of depression, by means of chronotherapeutics, in adolescents. Read More

    Would you say "yes" in the evening? Time-of-day effect on response bias in four types of working memory recognition tasks.
    Chronobiol Int 2017 Nov 7:1-10. Epub 2017 Nov 7.
    b Neurobiology Department, The Malopolska Centre of Biotechnology , Jagiellonian University , Krakow , Poland.
    Across a wide range of tasks, cognitive functioning is affected by circadian fluctuations. In this study, we investigated diurnal variations of working memory performance, taking into account not only hits and errors rates, but also sensitivity (d') and response bias (c) indexes (established by signal detection theory). Fifty-two healthy volunteers performed four experimental tasks twice - in the morning and in the evening (approximately 1 and 10 h after awakening). Read More

    Circadian profiles of progesterone, gonadotropins, cortisol and corticotropin in cycling and postmenopausal women.
    Chronobiol Int 2017 Nov 7:1-8. Epub 2017 Nov 7.
    a Laboratoire de Physiologie et Pharmacologie , Université libre de Bruxelles , Brussels , Belgium.
    Little is known about the regulation of temporal variations of progesterone over the 24-hr span in young cycling women as well as in postmenopausal women. The purpose of the present study was to investigate the relationships between diurnal variations of progesterone and diurnal variations of hormones of the gonadotropic and corticotropic axes, and to provide further information on the source of progesterone secretion under physiological conditions. Twenty-four-hour hormonal profiles were explored under well-controlled laboratory conditions in 10 healthy women (21-36 yr old) with normal ovulatory cycles during early-mid follicular and late luteal phases, and in 8 healthy postmenopausal women (48-74 yr old). Read More

    Immediate, lag and time window effects of meteorological factors on ST-elevation myocardial infarction incidence.
    Chronobiol Int 2017 Nov 7:1-9. Epub 2017 Nov 7.
    b Information Systems Laboratory, Faculty of Computer and Information , University of Ljubljana , Ljubljana , Slovenia.
    The influence of several meteorological parameters on acute myocardial infarction (AMI) incidences with immediately and/or delayed effects has been widely reported. It remains unknown whether the individual AMI subtypes reveal similar patterns. To date, generally seasonal variation in ST elevation MI (STEMI) has been investigated. Read More

    Social jetlag and depression status: Results obtained from the Netherlands Study of Depression and Anxiety.
    Chronobiol Int 2017 Nov 7:1-7. Epub 2017 Nov 7.
    a University of Groningen, University Medical Center Groningen , Department of Psychiatry, Research School of Behavioural and Cognitive Neurosciences (BCN), Interdisciplinary Center for Psychopathology and Emotion regulation (ICPE) , Groningen , the Netherlands.
    Social jetlag, the misalignment between the internal clock and the socially required timing of activities, is highly prevalent, especially in people with an evening chronotype and is hypothesized to be related to the link between the evening chronotype and major depressive disorder. Although social jetlag has been linked to depressive symptoms in non-clinical samples, it has never been studied in patients with major depressive disorder (MDD). This study is aimed to study social jetlag in patients with major depressive disorder and healthy controls, and to further examine the link between social jetlag and depressive symptomatology. Read More

    Sleep quality and methylation status of core circadian rhythm genes among nurses and midwives.
    Chronobiol Int 2017 Nov 6:1-13. Epub 2017 Nov 6.
    a Department of Environmental Epidemiology , Nofer Institute of Occupational Medicine , Lodz , Poland.
    ABSTARCT Poor sleep quality or sleep restriction is associated with sleepiness and concentration problems. Moreover, chronic sleep restriction may affect metabolism, hormone secretion patterns and inflammatory responses. Limited recent reports suggest a potential link between sleep deprivation and epigenetic effects such as changes in DNA methylation profiles. Read More

    Dynamics of core body temperature cycles in long-term measurements under real life conditions in women.
    Chronobiol Int 2017 Nov 6:1-16. Epub 2017 Nov 6.
    a Dr. Senckenbergisches Chronomedizinisches Institut , Fachbereich Medizin der Goethe-Universität , Frankfurt am Main , Germany.
    Studies under real life conditions become more and more relevant in chronobiological and chronomedical research. The present study aims to analyze one of the most prominent biological rhythms: the core body temperature (CBT) rhythm in the real world outside the laboratory. CBT was recorded continuously in 37 healthy women (age between 21 and 44 years, median 29 years) with a newly developed intravaginal temperature sensor for up to 102 days. Read More

    Seasonal effects on the sleep-wake cycle, the rest-activity rhythm and quality of life for Japanese and Thai older people.
    Chronobiol Int 2017 Oct 24:1-11. Epub 2017 Oct 24.
    d Department of Occupational Therapy, Faculty of Associated Medical Sciences , Chiang Mai University , Chiang Mai , Thailand.
    Background: The sleep-wake cycle and the rest-activity rhythm are known to change with aging, and such changes have been implicated in higher levels of depression as well as an increased incidence of dementia. However, information supporting seasonal changes in the sleep-wake cycle, the rest-activity rhythm and quality of life in older community-dwelling people remains insufficient. The aim of the present study was to prospectively investigate seasonal effects on the sleep-wake cycle, the rest-activity rhythm and quality of life among older people living in areas of Japan or Thailand with different climate classifications. Read More

    The CLOCK 3111T/C single nucleotide polymorphism and daytime fluctuations of gastric motility in healthy young women: A preliminary study.
    Chronobiol Int 2017 Oct 24:1-5. Epub 2017 Oct 24.
    a Laboratory of Nutritional Physiology, Graduate School of Human Science and Environment , University of Hyogo , Hyogo , Japan.
    The 3111T/C single nucleotide polymorphism (SNP) of Circadian Locomotor Output Cycles Kaput (CLOCK) gene reportedly affects gastric motility before breakfast. It is of interest to know whether this SNP can affect the motility during the daytime. We investigated the association between the CLOCK 3111T/C SNP and several gastric motility parameters during the time period from 8:00 to 20:00 in 34 young women with scheduled meals. Read More

    The effect of dim light at night on cerebral hemodynamic oscillations during sleep: A near-infrared spectroscopy study.
    Chronobiol Int 2017 Oct 24:1-14. Epub 2017 Oct 24.
    a Department of Neurology , Seoul National University Hospital , Seoul , South Korea.
    Recent studies have reported that dim light at night (dLAN) is associated with risks of cardiovascular complications, such as hypertension and carotid atherosclerosis; however, little is known about the underlying mechanism. Here, we evaluated the effect of dLAN on the cerebrovascular system by analyzing cerebral hemodynamic oscillations using near-infrared spectroscopy (NIRS). Fourteen healthy male subjects underwent polysomnography coupled with cerebral NIRS. Read More

    Daily rhythms of locomotor and demand-feeding activities in Schizothorax pelzami (Kessler, 1870).
    Chronobiol Int 2017 Oct 24:1-11. Epub 2017 Oct 24.
    c Department of Fisheries , Ferdowsi University of Mashhad , Mashhad , Iran.
    A study was carried out to investigate the daily rhythms of locomotor and feeding activity of Khajoo, Schizothorax pelzami, a candidate species for freshwater aquaculture. Using self-feeder juvenile Khajoo were exposed to a 12/12 LD cycle to determine the rhythms of locomotor and feeding activity. The effects of feeding on locomotor and feeding activity of fish were also examined. Read More

    Multilevel modeling of chronotype and weekdays versus weekends to predict nonrestorative sleep.
    Chronobiol Int 2017 Oct 24:1-12. Epub 2017 Oct 24.
    a The University of Alabama , Department of Psychology, Tuscaloosa, United States of America.
    Nonrestorative sleep, a form of subjective sleep disturbance that has been largely neglected in the literature, is newly accessible to researchers via the validated restorative sleep questionnaire (RSQ). The daily version of the RSQ allows for analysis of within-subjects variation in restorative sleep across repeated samplings, and such day-to-day regularity in sleep variables has been highlighted as an important new direction for research. The present study used a sophisticated statistical approach, multilevel modeling, to examine the contributions of circadian chronotype, calendar day of questionnaire completion (weekends versus weekdays), and their interaction in explaining both interindividual and intraindividual variance in restorative sleep. Read More

    Updating the "Risk Index": A systematic review and meta-analysis of occupational injuries and work schedule characteristics.
    Chronobiol Int 2017 Oct 24:1-16. Epub 2017 Oct 24.
    a Department of Environmental Health , Harvard T.H. Chan School of Public Health , Boston , MA , USA.
    Fatigue is a major risk factor for occupational 'accidents' and injuries, and involves dimensions of physical, mental, and muscular fatigue. These dimensions are largely influenced by temporal aspects of work schedules. The "Risk Index" combines four fatigue-related components of work schedules to estimate occupational 'accident' and injury risk based on empirical trends: shift type (morning, afternoon/evening, night), length and consecutive number, and on-shift rest breaks. Read More

    Different times of day do not change heart rate variability recovery after light exercise in sedentary subjects: 24 hours Holter monitoring.
    Chronobiol Int 2017 Oct 20:1-12. Epub 2017 Oct 20.
    a Cardiovascular Research Unit and Exercise Physiology, University Hospital and Faculty of Physical Education and Sports , Federal University of Juiz de Fora , Juiz de Fora , MG , Brazil.
    Incidence of cardiovascular events follows a circadian rhythm with peak occurrence during morning. Disturbance of autonomic control caused by exercise had raised the question of the safety in morning exercise and its recovery. Furthermore, we sought to investigate whether light aerobic exercise performed at night would increase HR and decrease HRV during sleep. Read More

    Circadian rest-activity rhythm in chronic obstructive pulmonary disease.
    Chronobiol Int 2017 Oct 20:1-5. Epub 2017 Oct 20.
    d Laboratory of Sleep and Biological Rhythms, School of Medicine , Universidade Federal do Ceará , Fortaleza , Ceará , Brazil.
    To characterize circadian rest-activity rhythm in COPD, 26 cases (66.9 ± 8.5y) and 15 controls (63. Read More

    Seasonal expression patterns of clock-associated genes in the blue mussel Mytilus edulis.
    Chronobiol Int 2017 Oct 17:1-15. Epub 2017 Oct 17.
    a School of Environmental Sciences , University of Hull , Hull , UK.
    Environmental cues allow organisms to synchronise their internal biological rhythms with external environmental cycles. These rhythms are regulated on a molecular level by oscillating interactions between clock genes and their proteins. Light is a particularly relevant environmental cue, provisioning daily information via light/dark cycles as well as seasonal information via day-length (photoperiod). Read More

    Chronic disruptions of circadian sleep regulation induce specific proinflammatory responses in the rat colon.
    Chronobiol Int 2017 Oct 17:1-15. Epub 2017 Oct 17.
    a Department of Neurohumoral Regulations , Institute of Physiology, Czech Academy of Sciences , Prague , Czech Republic.
    Exposure to environmental conditions that disturb the daily rhythms has been shown to enhance the proinflammatory responses of immunostimulant-challenged immune system. However, it is not known whether circadian disturbances may stimulate unchallenged immune responses and thus contribute per se to the development of inflammation-related diseases. Our aim was to ascertain an effect of various conditions threatening the behavioral activity/rest cycle regulation, namely aging with or without melatonin, 6 h advance/delay phase shifts in the light/dark cycle repeated with a 2-day frequency and constant light, on expression of immune markers in the rat colon. Read More

    Complex interaction between circadian rhythm and diet on bile acid homeostasis in male rats.
    Chronobiol Int 2017 Oct 13:1-15. Epub 2017 Oct 13.
    a Department Endocrinology and Metabolism , Academic Medical Centre, University of Amsterdam , Amsterdam , The Netherlands.
    Desynchronization between the master clock in the brain, which is entrained by (day) light, and peripheral organ clocks, which are mainly entrained by food intake, may have negative effects on energy metabolism. Bile acid metabolism follows a clear day/night rhythm. We investigated whether in rats on a normal chow diet the daily rhythm of plasma bile acids and hepatic expression of bile acid metabolic genes is controlled by the light/dark cycle or the feeding/fasting rhythm. Read More

    Effects of the light-dark cycle on diurnal rhythms of diet-induced thermogenesis in humans.
    Chronobiol Int 2017 Sep 29:1-8. Epub 2017 Sep 29.
    a Department of Environmental Science , Fukuoka Women's University , Fukuoka , Japan.
    This study aimed to clarify the effect of light exposure during the daytime and nighttime on diet-induced thermogenesis (DIT), which is one kind of energy expenditure, and the contribution of autonomic nervous activities (ANA) to the mechanism behind such effects. We found that the light-dark cycle significantly induced a diurnal rhythm of DIT, with afternoon levels tending to be higher than nighttime levels. By contrast, no such rhythms were observed under constant light or dark conditions. Read More

    Influence of light and food on the circadian clock in liver of rainbow trout, Oncorhynchus mykiss.
    Chronobiol Int 2017 Sep 21:1-14. Epub 2017 Sep 21.
    a Laboratorio de Fisioloxía Animal, Departamento de Bioloxía Funcional e Ciencias da Saúde, Facultade de Bioloxía and Centro Singular de Investigación Mariña-ECIMAT , Universidade de Vigo , Vigo , Spain.
    Several reports support the existence of multiple peripheral oscillators in fish, which may be able to modulate the rhythmic functions developed by those tissues hosting them. Thus, a circadian oscillator has been proposed to be located within fish liver. In this vertebrate group, the role played by the circadian system in regulating metabolic processes in liver is mostly unknown. Read More

    Seasonal variation in plasma lipids and lipases in young healthy humans.
    Chronobiol Int 2017 Sep 21:1-11. Epub 2017 Sep 21.
    c Departament de Bioquímica i Biomedicina Molecular , Facultat de Biologia, Universitat de Barcelona , Barcelona, Spain.
    Although intermediate metabolism is known to follow circadian rhythms, little information is available on the variation in lipase activities (lipoprotein and hepatic lipase, LPL and HL, respectively) and lipids throughout the year. In a cross-sectional study, we collected and analysed blood from 245 healthy students (110 men and 135 women) between 18 and 25 years old from the University of Barcelona throughout the annual campaign (March, May, October and December) of the blood bank. All subjects gave their written informed consent to participate. Read More

    Validation of the MESSi among adult workers and young students: General health and personality correlates.
    Chronobiol Int 2017 Sep 21:1-12. Epub 2017 Sep 21.
    d Department of Clinical Psychology and Psychobiology , School of Psychology, University of Barcelona , Barcelona , Spain.
    The aim of this study was to provide validity for the Spanish version of the Morningness-Eveningness-Stability Scale - improved (MESSi), a novel evolved assessment of circadian typology which considers the subjective phase and amplitude by morning affect (MA), eveningness (EV) and distinctness (DI; subjective amplitude) sub-scales. Convergence validity of the MESSi with the reduced Morningness-Eveningness Questionnaire (rMEQ) and relationships with the General Health Questionnaire (GHQ-12) and sensitivity to reward and punishment (SR and SP) were analyzed. Two different Spanish samples, young undergraduate students (n = 891, 18-30 years) and adult workers (n = 577, 31-65 years) participated in this study. Read More

    Sleep duration, nightshift work, and the timing of meals and urinary levels of 8-isoprostane and 6-sulfatoxymelatonin in Japanese women.
    Chronobiol Int 2017 Sep 21:1-10. Epub 2017 Sep 21.
    b Gihoku Kousei Hospital , Gifu , Japan.
    It has been hypothesized that disruption of circadian rhythms affects human health. Shift work and sleep deprivation are thought to disrupt the normal light-dark cycle, although the disruption due to shiftwork may be dependent on sleep deprivation. Both conditions have been suggested to be associated with an increased risk of cardiometabolic disorders. Read More

    Do night and around-the-clock firefighters' shift schedules induce deviation in tau from 24 hours of systolic and diastolic blood pressure circadian rhythms?
    Chronobiol Int 2017 18;34(8):1158-1174. Epub 2017 Sep 18.
    a Unité de Chronobiologie , Fondation A. de Rothschild , Paris cedex , France.
    Systolic (S) and diastolic (D) blood pressures (BP) [SBP and DBP] are circadian rhythmic with period (τ) in healthy persons assumed to be maintained at 24.0h. We tested this assumption in a sample of 30 healthy career (mean >12 yrs) 30-to-46 yr-old male Caucasian French firefighters (FFs) categorized into three groups according to work schedule and duties: Group A - 12 FFs working 12h day, 12h night, and occasionally 24h shifts and whose primary duties are firefighting plus paramedical and road rescue services; Group B - 9 FFs working mostly 12h day and 12h night shifts and whose duties are answering incoming emergency calls and coordinating service vehicle dispatch from fire stations with Group A personnel; Group C - 9 day shift (09:00-17:00h) FFs charged with administrative tasks. Read More

    Effects of differences in the availability of light upon the circadian rhythms of institutionalized elderly.
    Chronobiol Int 2017 Sep 14:1-14. Epub 2017 Sep 14.
    a Laboratori de Neurofisiologia del Son i Ritmes Biològics. Universitat Illes Balears (UIB) , IdISPa , Palma de Mallorca , Spain.
    The aim of this study was to compare the availability of diurnal and nocturnal light in two residences for aged persons (R1 and R2, Palma de Mallorca, Illes Balears, Spain). We found that the R1 inmates were exposed to lower amounts of light during waking time and higher amounts during sleeping time. The main traits of the circadian rhythms and the quality of sleep in the inmates of the two residences were found to be positively related to the availability of light during waking time and negatively to the increased light exposure during bed time. Read More

    Time-of-day effects of exposure to solar radiation on thermoregulation during outdoor exercise in the heat.
    Chronobiol Int 2017 Sep 14:1-15. Epub 2017 Sep 14.
    d Nippon Sport Science University , Tokyo , Japan.
    High solar radiation has been recognised as a contributing factor to exertional heat-related illness in individuals exercising outdoors in the heat. Although solar radiation intensity has been known to have similar time-of-day variation as body temperature, the relationship between fluctuations in solar radiation associated with diurnal change in the angle of sunlight and thermoregulatory responses in individuals exercising outdoors in a hot environment remains largely unknown. The present study therefore investigated the time-of-day effects of variations in solar radiation associated with changing solar elevation angle on thermoregulatory responses during moderate-intensity outdoor exercise in the heat of summer. Read More

    Diurnal opposite variation between angiotensinase activities in photo-neuro-endocrine tissues of rats.
    Chronobiol Int 2017 Sep 14:1-7. Epub 2017 Sep 14.
    a Unit of Physiology, Department of Health Sciences , University of Jaén , Jaén , Spain.
    Central and peripheral renin-angiotensin systems (RASs) act in a coordinated manner for the physiologic functions regulated by neuroendocrine events. However, whereas the diurnal rhythm of peripheral circulatory and tissue RASs is well known, the circadian behaviour of their components in central photo-neuro-endocrine structures, key elements for the control of circadian rhythms, has been barely studied. In the present study, we analysed the aspartyl- (AspAP) and glutamyl-aminopeptidase (GluAP) (aminopeptidase A) activities, the angiotensinases responsible for the metabolism of Ang I to Ang 2-10 and Ang II to Ang III, respectively, in the retina, anterior hypothalamus and pituitary at different light and dark time-points of a 12:12 h light:dark cycle (7-19 h light), using arylamide derivatives as substrates. Read More

    Intra-individual variability in the sleep of senior and junior rugby league athletes during the competitive season.
    Chronobiol Int 2017 Sep 14:1-9. Epub 2017 Sep 14.
    a Performance Sciences Department , Brisbane Broncos Rugby League Club , Red Hill , Queensland , Australia.
    This study examined the sleep intra-individual variability (IIV) of rugby league athletes across senior and junior levels during one week of the competitive season. Forty-five rugby league athletes across elite senior, sub-elite senior and elite junior levels each wore actigraphy monitors for seven days during the competitive season, and completed a subjective sleep diary each morning upon waking. Linear mixed models were used to assess differences in sleep measures between playing levels. Read More

    Effect of monochromatic light on circadian rhythmic expression of clock genes and arylalkylamine N-acetyltransferase in chick retina.
    Chronobiol Int 2017 14;34(8):1149-1157. Epub 2017 Sep 14.
    a Laboratory of Anatomy of Domestic Animal, College of Animal Medicine , China Agricultural University , Beijing , China.
    Birds have more developed visual function. They not only have the ability to detect light and darkness but also have the color vision. Previous study showed that monochromatic light influenced avian physiological processes, which were controlled by clock genes. Read More

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