Diel variation in cortisol, glucose, lactic acid and antioxidant system of black sea bass Centropristis striata under natural photoperiod.
Abstract Diel rhythm in activity of antioxidant enzymes, as well as contents of glutathione and lipid peroxides, has been intensively investigated in Mammalia and Aves, however, the relevant studies about fish are few. In the present study, we examined variation in contents of cortisol, glucose and lactic acid in plasma of black sea bass Centropristis striata under natural photoperiod during a 24-h period. In addition, variation in activity of antioxidant enzymes, such as superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), catalase (CAT) and glutathione reductase (GR) as well as contents of total glutathi...
Source: Chronobiology International - January 17, 2020 Category: Biology Authors: Ren X, Zhang J, Wang L, Wang Z, Wang Y Tags: Chronobiol Int Source Type: research

Internal consistency and convergent and divergent validity of the Liverpool jetlag questionnaire.
Abstract Objective measures of circadian disruption are difficult to capture in a free-living environment hence the importance of validating subjective measures of jetlag. We aimed to assess the internal consistency of the 15-item Liverpool Jetlag Scale and its convergent and divergent validity with indicators of fatigue and anxiety in a large sample of air passengers. Online survey of passengers was conducted after travel on a range of long-haul flights. Jetlag was captured using the Liverpool scale, fatigue was measured using the Vitality subscale of the Short-Form Health Survey (SF-36), and the presence of anxi...
Source: Chronobiology International - January 14, 2020 Category: Biology Authors: Ledger S, Bin YS, Nour M, Cistulli P, Bauman A, Allman-Farinelli M, Naismith SL, Stamatakis E, Caillaud C, De Chazal P, Simpson SJ Tags: Chronobiol Int Source Type: research

Time of day effect on balance performance, functional capacities and risk of fall in women with rheumatoid arthritis.
This study explored the time of day effect of balance performance, functional capacities and risk of fall in three different times in patients with rheumatoid arthritis (RA) and the association between these variations and those of RA symptoms.Methods: A "discontinual" protocol, composed of three test sessions, carried out at 6 am, 2 pm and 10 pm was set up, in order to investigate the time of day effect of balance performance, functional capacities, risk of fall, stiffness, range of motion, swollen and painful joints in women with RA.Results: Time Up and Go Test (TUGT), Functional Reach Test (FRT) and tinetti te...
Source: Chronobiology International - January 8, 2020 Category: Biology Authors: Bouchaala F, Laatar R, Lahiani M, Zouabi A, Borji R, Rebai H, Sahli S Tags: Chronobiol Int Source Type: research

Message from the new editor-in-chief and assistant editor of Chronobiology International.
PMID: 31914817 [PubMed - as supplied by publisher] (Source: Chronobiology International)
Source: Chronobiology International - January 8, 2020 Category: Biology Authors: Smolensky MH, Hermida-Ayala RG Tags: Chronobiol Int Source Type: research

Time-of-day variation on performance measures in repeated-sprint tests: a systematic review.
Abstract The lack of standardization of methods and procedures have hindered agreement in the literature related to time-of-day effects on repeated sprint performance and needs clarification. Therefore, the aim of the present study was to investigate and systematically review the evidence relating to time-of-day based on performance measures in repeated-sprints.The entire content of PubMed (MEDLINE), Scopus, SPORTDiscus® (via EBSCOhost) and Web of Science was searched. Only experimental research studies conducted in male adult participants aged ≥18yrs, published in English before June 2019 were included. St...
Source: Chronobiology International - December 19, 2019 Category: Biology Authors: Pullinger SA, Cocking S, Robertson CM, Tod D, Doran DA, Burniston JG, Varamenti E, Edwards BJ Tags: Chronobiol Int Source Type: research

Melatonin does not produce sedation in rats: A chronobiological study.
Conclusion: These results suggest that melatonin may be used for sedation induction, mainly in preoperative patients. PMID: 31851848 [PubMed - as supplied by publisher] (Source: Chronobiology International)
Source: Chronobiology International - December 18, 2019 Category: Biology Authors: Barbosa-Méndez S, Salazar-Juarez A Tags: Chronobiol Int Source Type: research

Effects of circadian restricted feeding on parameters of metabolic syndrome among healthy subjects.
Abstract Experimental studies indicate that energy homeostasis to the circadian clock at the behavioral, physiological, and molecular levels, emphasize that timing of food intake may play a significant role in the development of obesity and central obesity. Therefore, resetting the circadian clock by circadian energy restriction via food intake in the morning or evening, may be used as a new approach for prevention of obesity, metabolic syndrome and related diseases. After ethical clearance and written, informed consent, free living subjects were included if they volunteered to take most of the total daily meals (...
Source: Chronobiology International - December 17, 2019 Category: Biology Authors: Singh RB, Cornelissen G, Mojto V, Fatima G, Wichansawakun S, Singh M, Kartikey K, Sharma JP, Torshin VI, Chibisov S, Kharlitskaya E, Al-Bawareed OA Tags: Chronobiol Int Source Type: research

Diurnal trajectories of salivary cortisol and α-amylase and psychological profiles in patients with central serous chorioretinopathy.
Diurnal trajectories of salivary cortisol and α-amylase and psychological profiles in patients with central serous chorioretinopathy. Chronobiol Int. 2019 Dec 16;:1-10 Authors: Scarinci F, Patacchioli FR, Palmery M, Pasquali V, Costanzo E, Ghiciuc CM, Parravano M Abstract It has been hypothesized that the occurrence of central serous chorioretinopathy (CSC) might be associated with stress. Therefore, our purpose was to investigate the diurnal trajectories of salivary cortisol and α-amylase (α-Amy) - markers of hypothalamic-pituitary-adrenal (HPA) axis and sympathetic-adrenal-medullar...
Source: Chronobiology International - December 16, 2019 Category: Biology Authors: Scarinci F, Patacchioli FR, Palmery M, Pasquali V, Costanzo E, Ghiciuc CM, Parravano M Tags: Chronobiol Int Source Type: research

Administration timing and duration-dependent effects of sesamin isomers on lipid metabolism in rats.
Abstract Metabolism of lipids such as cholesterol and triglycerides has daily variations and is controlled by a circadian clock. Sesamin isomers, a mixture of sesamin and episesamin (SE), are types of lignans in sesame seed that have shown the improvement of lipid metabolism with various diseases in an animal model. We therefore tested whether the effects of SE on lipid metabolism are influenced by timing of administration. High-fat diet (HFD)-loaded rat was administered SE in the ZT13 or 14 (at the beginning of the active phase) or ZT23 or 22 (at the end of the active phase) every day for 7 or 28 days, and the ef...
Source: Chronobiology International - December 13, 2019 Category: Biology Authors: Tateishi N, Morita S, Yamazaki I, Okumura H, Kominami M, Akazawa S, Funaki A, Tomimori N, Rogi T, Shibata H, Shibata S Tags: Chronobiol Int Source Type: research

Developing a light-based intervention to reduce fatigue and improve sleep in rapidly rotating shift workers.
Abstract Over a quarter of employees in North America and a fifth of those in the European Union do shift work. Working these schedules increases fatigue, sleepiness, and errors at work. In the long term, it may also increase the risk of cardiovascular disease, gastrointestinal problems, and cancer. Some of these consequences may be partly due to circadian misalignment, in which sleep and activity patterns no longer align with one's circadian rhythms. Previous research has found that controlling light exposure can improve circadian alignment in individuals who work permanent night shifts. However, light-based inte...
Source: Chronobiology International - December 11, 2019 Category: Biology Authors: Olson JA, Artenie DZ, Cyr M, Raz A, Lee V Tags: Chronobiol Int Source Type: research

Discovery of differentially expressed genes in the intestines of Pelteobagrus vachellii within a light/dark cycle.
Abstract In aquaculture, it is necessary to determine of the diurnal biological variations in the intestines to determine an appropriate feeding schedule. The present study aimed to examine the transcriptomes of the Pelteobagrus vachellii intestines at four time points (0 h, 6 h, 12 h, and 18 h) within a light/dark cycle. In comparison with the zeitgeber time 0 (ZT0) transcriptomes, we identified 37,842 unigenes with significant differential expression, including 6,638; 9,626; and 7,938 that genes upregulated, and 3,507; 4,703; and 5,412 genes that were down regulated at 4, 12, and 24 h re...
Source: Chronobiology International - December 6, 2019 Category: Biology Authors: Qin C, Sun J, Wang J, Han Y, Yang H, Shi Q, Lv Y, Hu P Tags: Chronobiol Int Source Type: research

Does before-bedtime body warming by bathing or other means attenuate sleep-time arterial blood pressure?
PMID: 31809590 [PubMed - as supplied by publisher] (Source: Chronobiology International)
Source: Chronobiology International - December 6, 2019 Category: Biology Authors: Smolensky MH, Haghayegh S, Khoshnevis S, Diller KR Tags: Chronobiol Int Source Type: research

Melatonin mends adverse temporal effects of bright light at night partially independent of its effect on stress responses in captive birds.
Abstract Ecological artificial light at night (ALAN) has been increasingly associated with negative effects on the behavior and ecology of wild birds. However, the impacts of short-term bright ALAN on the temporal biology of companion animals and the underlying mediating mechanism are unknown. We evaluated impacts of 1X60-min/middle night ALAN (200 lux, λDominant = 460 nm) nightly with or without melatonin administration on growth performance, reproductive capacity, food and water intake, and stress responses in Australian budgerigars (Melopsittacus undulatus) under captivity. 36 birds were h...
Source: Chronobiology International - December 6, 2019 Category: Biology Authors: Malek I, Haim A, Izhaki I Tags: Chronobiol Int Source Type: research

Modeling inter-sex and inter-individual variability in response to chronopharmacological administration of synthetic glucocorticoids.
Abstract Endogenous glucocorticoids have diverse physiological effects and are important regulators of metabolism, immunity, cardiovascular function, musculoskeletal health and central nervous system activity. Synthetic glucocorticoids have received widespread attention for their potent anti-inflammatory activity and have become an important class of drugs used to augment endogenous glucocorticoid activity for the treatment of a host of chronic inflammatory conditions. Chronic use of synthetic glucocorticoids is associated with a number of adverse effects as a result of the persistent dysregulation of glucocortico...
Source: Chronobiology International - December 4, 2019 Category: Biology Authors: Scherholz ML, Rao RT, Androulakis IP Tags: Chronobiol Int Source Type: research

Exploring the role of circadian clock gene and association with cancer pathophysiology.
Abstract Most of the processes that occur in the mind and body follow natural rhythms. Those with a cycle length of about one day are called circadian rhythms. These rhythms are driven by a system of self-sustained clocks and are entrained by environmental cues such as light-dark cycles as well as food intake. In mammals, the circadian clock system is hierarchically organized such that the master clock in the suprachiasmatic nuclei of the hypothalamus integrates environmental information and synchronizes the phase of oscillators in peripheral tissues.The circadian system is responsible for regulating a variety of ...
Source: Chronobiology International - December 3, 2019 Category: Biology Authors: Keshvari M, Nejadtaghi M, Hosseini-Beheshti F, Rastqar A, Patel N Tags: Chronobiol Int Source Type: research

Melatonin ingestion after exhaustive late-evening exercise attenuate muscle damage, oxidative stress, and inflammation during intense short term effort in the following day in teenage athletes.
Abstract The present study aimed to investigate whether nocturnal melatonin (MEL) ingestion has beneficial effects against exercise-induced oxidative stress and muscle damage in young athletes. Fourteen healthy-trained teenagers performed two-test sessions separated by at least, 1 week. During each session, participants completed the Running-Based Anaerobic Sprint Test (RAST) at 20:00 h. Then, they ingested a single 10-mg tablet of MEL or Placebo (PLA) in a double-blind randomized order at 22:00 h. The following morning (i.e., 07:30 h), participants performed the same test as the previous night. Blood samples were...
Source: Chronobiology International - December 2, 2019 Category: Biology Authors: Cheikh M, Makhlouf K, Ghattassi K, Graja A, Ferchichi S, Kallel C, Houda M, Souissi N, Hammouda O Tags: Chronobiol Int Source Type: research

Association of rest-activity and light exposure rhythms with sleep quality in insomnia patients.
Abstract The relevance of altered rest-activity rhythm (RAR) and light exposure rhythm (LER) in insomnia patients under natural conditions remains unclear. The aim of this study was to compare the parametric and nonparametric circadian variables of RAR and those of LER under natural conditions between insomnia patients and normal controls (NC) in a community-dwelling setting. The relationship of the nonparametric variables with sleep quality was also explored in both groups. Participants above 18 years old were recruited from three Public Health Centers in a rural area of Korea. Actigraphy (Actiwatch 2; Philips Re...
Source: Chronobiology International - December 2, 2019 Category: Biology Authors: Kim SJ, Lim YC, Kwon HJ, Lee JH Tags: Chronobiol Int Source Type: research

Time of day difference in postprandial glucose and insulin responses: Systematic review and meta-analysis of acute postprandial studies.
Abstract Current dietary trends show that humans consume up to 40% of their energy intake during the night. Those who habitually eat during the night are observed to have an increased risk of metabolic conditions such as type-2 diabetes and cardiovascular disease. Increasing evidence suggest that a biological consequence of eating during the night is a larger postprandial glucose response, compared to meals eaten earlier in the day. However, findings from individual acute postprandial studies have been inconsistent, due to variations in protocols. Therefore, this review aimed to systematically summarize findings f...
Source: Chronobiology International - November 29, 2019 Category: Biology Authors: Leung GKW, Huggins CE, Ware RS, Bonham MP Tags: Chronobiol Int Source Type: research

The influences of sleep duration, chronotype, and nightwork on the ovarian cycle.
Abstract Despite research indicating that sleep disorders influence reproductive health, the effects of sleep on reproductive hormone concentrations are poorly characterized. We prospectively followed 259 regularly menstruating women across one to two menstrual cycles (the BioCycle Study, 2005-2007), measuring fasting serum hormone concentrations up to eight times per cycle. Women provided information about daily sleep in diaries and chronotype and night/shift work on a baseline questionnaire. We evaluated percent differences in mean hormone concentrations, the magnitude of shifts in the timing and amplitude of ho...
Source: Chronobiology International - November 28, 2019 Category: Biology Authors: Michels KA, Mendola P, Schliep KC, Yeung EH, Ye A, Dunietz GL, Wactawski-Wende J, Kim K, Freeman JR, Schisterman EF, Mumford SL Tags: Chronobiol Int Source Type: research

Association between misalignment of circadian rhythm and obesity in Korean men: Sixth Korea National Health and Nutrition Examination Survey.
Conclusions: Factors disturbing the circadian rhythm were associated with general and abdominal obesity. Additional studies are needed, and associations with metabolic diseases should be investigated. PMID: 31760828 [PubMed - as supplied by publisher] (Source: Chronobiology International)
Source: Chronobiology International - November 25, 2019 Category: Biology Authors: Kim HJ, Choi S, Kim K, Park H, Kim KH, Park SM Tags: Chronobiol Int Source Type: research

Development, validation and reliability of the Chrononutrition Profile - Questionnaire.
Abstract Chrononutrition, or the circadian timing of food intake, has garnered attention as a topic of study due to its associations with health (e.g. weight gain); however, a valid and reliable assessment of chrononutrition in daily life has not yet been developed. This paper details the development and initial reliability and validity testing of the Chrononutrition Profile - Questionnaire (CP-Q). The CP-Q assesses six components of chrononutrition that are likely to influence health (breakfast skipping, largest meal, evening eating, evening latency, night eating, and eating window). This questionnaire is designe...
Source: Chronobiology International - November 25, 2019 Category: Biology Authors: Veronda AC, Allison KC, Crosby RD, Irish LA Tags: Chronobiol Int Source Type: research

Postural impairments in Parkinson's disease are not associated with changes in circadian rhythms changes.
Abstract Parkinson's disease (PD) is a progressive neurodegenerative disease, with a worldwide incidence of 1% in individuals>60 years of age. Its primary characteristics include postural impairments and changes in circadian rhythms. The authors investigated the association between postural impairment and changes in circadian rhythms in 24 PD subjects diagnosed with stages 1 to 3 on the Hoehn-Yard (HY) scale and regularly used dopaminergic medication for at least 1 year (experimental group - EG) and 24 healthy elderly individuals without a history of neurological impairment as the control group (CG). Static bal...
Source: Chronobiology International - November 25, 2019 Category: Biology Authors: Zulai LC, Albuquerque AM, Papcke C, Louzada FM, Scheeren EM Tags: Chronobiol Int Source Type: research

Block the light and sleep well: Evening blue light filtration as a part of cognitive behavioral therapy for insomnia.
The objective of the present study was to assess the effect of combining CBT-I with wearing blue-light blocking glasses 90 min prior to bedtime on subjective and objective sleep parameters and daily symptoms (anxiety, depression, hyperarousal). Thirty patients (mean age 48.1 ± 16.13 years, range 21-71, 15 men/15 women) completed a CBT-I group therapy program, with groups randomly assigned to either "active" (blue-light filtering glasses) condition or "placebo" (glasses without filtering properties) condition. Patients were continually monitored by wristwatch actigraphy, kept their sleep diaries a...
Source: Chronobiology International - November 22, 2019 Category: Biology Authors: Janků K, Šmotek M, Fárková E, Kopřivová J Tags: Chronobiol Int Source Type: research

The association between sleep chronotype and obesity among black and white participants of the Bogalusa Heart Study.
We examined the associations between chronotype and obesity among black and white men and women participating in the Bogalusa Heart Study (BHS).Body mass index (BMI) and sleep data were available for 1,197 middle-aged men and women (mean age 48.2 ± 5.3 years) who participated in the BHS 2013-2016. Based on the reduced Morningness-Eveningness Questionnaire's cutoff values for chronotypes, we combined 'definitely morning' and 'moderately morning' types into 'morning' type, 'definitely evening' and 'moderately evening' types into 'evening' type and kept those who were "neither" type in a separa...
Source: Chronobiology International - November 20, 2019 Category: Biology Authors: Sun X, Gustat J, Bertisch SM, Redline S, Bazzano L Tags: Chronobiol Int Source Type: research

Sleep habits, circadian preferences and substance use in a Mexican population: the use of the Morningness-Eveningness-Stability-Scale improved (MESSi).
This study aimed to validate the Morningness-Eveningness-Stability-Scale improved (MESSi) in Mexico, analyzing the factor structure and sleep habits, combined with the proposal of cutoff values for the scales, and to assess the relationship with substance use. We applied the questionnaires through an online survey to a total sample of 510 Mexicans, aged 18-77 years (M = 27.79, SD = 10.24). The MESSi showed an acceptable fit and the Cronbach's alpha coefficients were good to satisfactory in the Mexican sample in every subscale: Morning Affect (MA, α = 0.90), Eveningness (EV, α = 0.88), Distinctness (DI, α ...
Source: Chronobiology International - November 14, 2019 Category: Biology Authors: Arrona-Palacios A, Díaz-Morales JF, Adan A, Randler C Tags: Chronobiol Int Source Type: research

Performance assessment of new-generation Fitbit technology in deriving sleep parameters and stages.
Abstract We compared performance in deriving sleep variables by both Fitbit Charge 2™, which couples body movement (accelerometry) and heart rate variability (HRV) in combination with its proprietary interpretative algorithm (IA), and standard actigraphy (Motionlogger® Micro Watch Actigraph: MMWA), which relies solely on accelerometry in combination with its best performing 'Sadeh' IA, to electroencephalography (EEG: Zmachine® Insight+ and its proprietary IA) used as reference. We conducted home sleep studies on 35 healthy adults, 33 of whom provided complete datasets of the three simultaneously asse...
Source: Chronobiology International - November 13, 2019 Category: Biology Authors: Haghayegh S, Khoshnevis S, Smolensky MH, Diller KR, Castriotta RJ Tags: Chronobiol Int Source Type: research

Evening chronotype, late weekend sleep times and social jetlag as possible causes of sleep curtailment after maintaining perennial DST: ain't they as black as they are painted?
Abstract People sleep less in response to setting social clocks earlier relative to the sun clocks. We proposed here a model-based approach for estimating sleep loss as the difference between weekend and weekday risetimes divided on the difference between weekend risetime and weekday bedtime. We compared this approach with a traditional approach to estimating sleep curtailment as the difference in weekly average sleep duration in two conditions. Weekday and weekend sleep times reported for 320 samples provided possibility of testing whether evening types with later weekend sleep times and larger social jetlag diff...
Source: Chronobiology International - November 7, 2019 Category: Biology Authors: Putilov AA, Poluektov MG, Dorokhov VB Tags: Chronobiol Int Source Type: research

The effects of exposure to night shift work on liver function: A cross-sectional study with emphasis of alkaline phosphatase enzyme.
Abstract Background: Previous studies have demonstrated that shift work can be significantly associated with adverse effects on liver function. However, the association between shift work and alkaline phosphatase (ALP) enzyme as a well-known biomarker of liver disease has been undefined. Methods: This cross-sectional study was conducted on a total number of 6,475 eligible oil refinery workers. According to shift work schedules, the participants divided to the following groups: 12-hr rotating night (n = 2,630) and 12-hr fixed day (n = 3845). The Spearman's correlation and logistic regression were applied to assess ...
Source: Chronobiology International - November 7, 2019 Category: Biology Authors: Khosravipour M, Shah Mohammadi M Tags: Chronobiol Int Source Type: research

The relationship between chronotype, sleep disturbance, severity of fibromyalgia, and quality of life in patients with fibromyalgia.
i Y Abstract Patients with fibromyalgia (FM) report high levels of sleep disturbance and chronic diffuse musculoskeletal pain. These patients experience diminished quality of life (QoL) due to pain and other comorbidities. Chronotype preferences have been suggested as a potential factor connecting increased severity of FM, sleep disturbances, and poor overall QoL. The present study is the first study examining the possible association between chronotype preferences, sleep disturbance, severity of FM, and QoL in patients with FM.One hundred drug-free patients diagnosed with FM participated in this cross-sectional s...
Source: Chronobiology International - November 5, 2019 Category: Biology Authors: Türkoğlu G, Selvi Y Tags: Chronobiol Int Source Type: research

Morningness orientation is an important determinant to circadian misalignment and tolerance: an Asian perspective.
Abstract Diurnal preferences refers to one's preference of performing timely activities where one may prefer for late timings and the other for earlier, which account for their chronotype that is controlled partly by genetic factors and are also influenced by environmental factors. Individual's circadian preference can be drawn using questionnaire tools as well as can be externally validated by studying various physiological parameters that has a rhythmicity. Determination of chronotype is well studied worldwide but mostly in European and American countries. Asia being the largest continent, comprising so many cou...
Source: Chronobiology International - November 5, 2019 Category: Biology Authors: Majumdar P, Sahu S Tags: Chronobiol Int Source Type: research

Eveningness and poor sleep quality contribute to depressive residual symptoms and behavioral inhibition in patients with bipolar disorder.
This study investigates the associations between circadian markers and sleep quality on residual depressive symptoms and inhibition/activation dimensions during the euthymic phase. A sample of 89 euthymic adult individuals with BD was assessed for circadian preference and typology using the Composite Scale of Morningness (CSM) and the Circadian Type Inventory (CTI) and for sleep quality using the Pittsburgh Sleep Quality Index (PSQI). The Montgomery and Asberg Depression Rating Scale (MADRS) and the Multidimensional Assessment of Thymic States (MAThyS) were used to measure residual depressive symptoms and the inhibition/ac...
Source: Chronobiology International - November 5, 2019 Category: Biology Authors: Caruso D, Meyrel M, Krane-Gartiser K, Benard V, Benizri C, Brochard H, Geoffroy PA, Gross G, Maruani J, Prunas C, Yeim S, Palagini L, Dell'Osso L, Leboyer M, Bellivier F, Etain B Tags: Chronobiol Int Source Type: research

Association between shift work and risk of type 2 diabetes mellitus: a systematic review and dose-response meta-analysis of observational studies.
In conclusion, shift work is positively associated with an increased risk of type 2 diabetes. Among female workers, with the years of exposure to shift work prolonged, the risk of type 2 diabetes might increase accordingly. In the future, more studies are needed to confirm the results of dose-response analysis. PMID: 31684766 [PubMed - as supplied by publisher] (Source: Chronobiology International)
Source: Chronobiology International - November 4, 2019 Category: Biology Authors: Gao Y, Gan T, Jiang L, Yu L, Tang D, Wang Y, Li X, Ding G Tags: Chronobiol Int Source Type: research

Evaluation in humans of ELF-EMF exposure on chromogranin A, a marker of neuroendocrine tumors and stress.
In this study, we looked at the effect in humans of chronic daily exposure to a 50-Hz magnetic field. We examined in 15 men (38.0 ± 0.9 years) the effects of chronic daily exposure to a 50-Hz magnetic field for 1-20 yrs both at home and at work. EMDEX II dosimeters were used to record magnetic field all day long every 30 s. for 1 week. The weekly geometric mean of the individual exposures ranged from 0.1 to 2.6 μT. Blood samples were taken hourly between 20:00 h and 08:00 h. CgA patterns of exposed subjects were compared to age-matched controls. The results of exposed subje...
Source: Chronobiology International - November 4, 2019 Category: Biology Authors: Touitou Y, Lambrozo J, Mauvieux B, Riedel M Tags: Chronobiol Int Source Type: research

Narrow-band ultraviolet B (NB UV-B) exposures improve mood in healthy individuals differently depending on chronotype.
In conclusion, in our pilot study, NB UV-B exposure improved mood, especially among those with evening preference for their daily activities, as well as circulating 25(OH)D3 levels, whereas circulating IL-6 levels decreased. Abbreviations: UVR: Ultraviolet radiation; NB UV-B: narrow-band UV-B; VAS: Visual Analogue Scales; β-END: β-endorphin; IL-6: Interleukin-6. PMID: 31530241 [PubMed - in process] (Source: Chronobiology International)
Source: Chronobiology International - September 20, 2019 Category: Biology Authors: Toledo A, Karppinen T, Miettinen ME, Leppäluoto J, Vuolteenaho O, Ylianttila L, Kautiainen H, Snellman E, Partonen T Tags: Chronobiol Int Source Type: research

Errata.
Authors: PMID: 31429607 [PubMed - in process] (Source: Chronobiology International)
Source: Chronobiology International - August 22, 2019 Category: Biology Tags: Chronobiol Int Source Type: research

Diurnal variation in sperm DNA fragmentation: analysis of 11,382 semen samples from two populations and in vivo animal experiments.
Abstract Circadian rhythms have been found in some reproductive functions phenotypes but remain unclear for sperm DNA fragmentation index (DFI). The present study aims to investigate the diurnal variation of DFI in mice model and men sperm. Adult male mice were sacrificed for sperm DFI with Sperm Chromatin Structure Assay (SCSA) in 24 hours at 6 evenly distributed time points. A cosinor pattern of DFI was observed with a nadir at zeitgeber time 10 AM. In a community population with 630 semen samples collected between 8 AM and 20 PM, the temporal variation of DFI also fit a cosinor pattern with a - 343&de...
Source: Chronobiology International - August 16, 2019 Category: Biology Authors: Ni W, Liu K, Hou G, Pan C, Wu S, Zheng J, Cao J, Chen Q, Huang X Tags: Chronobiol Int Source Type: research

Caloric midpoint is associated with total calorie and macronutrient intake and body mass index in undergraduate students.
Abstract Studies have suggested that eating at later times may be a risk factor for being overweight. The aim of this study was to investigate the association of caloric midpoint on the anthropometric profile and calorie and macronutrient intake during the day. The study included 718 Brazilian undergraduate students (20.5 ± 2.9 years old; 67% women). Dietary intake was assessed by 24-h recall and the diurnal variation of calorie consumption was evaluated by caloric midpoint average time at which 50% of daily energy were consumed. Participants were classified into two groups according to caloric midpoint med...
Source: Chronobiology International - August 14, 2019 Category: Biology Authors: Teixeira GP, Barreto ACF, Mota MC, Crispim CA Tags: Chronobiol Int Source Type: research

Psychophysical measure of visual luminance contrast during a daily rhythm.
This study evaluated visual sensitivity to luminance contrast during a daily period. Twenty-eight young male adults (M = 24.85; SD = 2.4) with normal color vision and 20/20 visual acuity participated in this study. The circadian pattern was assessed using the Karolinska Sleepiness Scale (KSS), the Pittsburgh Sleep Quality Index (PSQI), and a sleep diary. To measure the luminance contrast, we used version 11.0 of the Metropsis software with sine-element frequency stimuli for spatial frequencies of 0.2, 0.6, 1, 3.1, 6.1, 8.8, 13.2, and 15.6 cycles per degree of visual angle (cpd). The stimuli were presented on...
Source: Chronobiology International - August 14, 2019 Category: Biology Authors: Andrade MJO, Rezende MTC, Figueiredo BGD, Farias CA, Santos NAD Tags: Chronobiol Int Source Type: research

The multidisciplinary therapy in binge eating disorder is able to influence the interdaily stability and sleep quality?
In conclusion, the maintenance of a regular lifestyle, such as imposed by the multidisciplinary therapy, is important to avoid alterations in the sleep-wake cycle, particularly in patients with eating disorders. PMID: 31401875 [PubMed - as supplied by publisher] (Source: Chronobiology International)
Source: Chronobiology International - August 12, 2019 Category: Biology Authors: Galasso L, Montaruli A, Mulè A, Castelli L, Bruno E, Caumo A, Esposito F, Roveda E Tags: Chronobiol Int Source Type: research

Validity and reliability of the Slovene version of the Morningness-Eveningness Questionnaire.
c-Groselj L Abstract Morningness-eveningness (ME) can be defined as individual differences in sleep-wake patterns, and the time of day people feel and perform best. Various self-report instruments that measure ME have been developed. The Horne and Östberg Morningness-Eveningness Questionnaire (MEQ) has most frequently been used for classifying ME types. The aim of this study was to investigate the validity and reliability of the Slovene version of the MEQ (Slovene MEQ). Two hundred and sixty-five participants (65.3% women, 34,7% men, mean age 38,1 years, range 19-67) took the Slovene MEQ twice, 2 weeks apart ...
Source: Chronobiology International - August 12, 2019 Category: Biology Authors: Treven Pišljar N, Štukovnik V, Zager Kocjan G, Dolenc-Groselj L Tags: Chronobiol Int Source Type: research

Measuring human alertness from histogram of response time to audio-visual stimuli.
Abstract Response time test is one of the widely used metrics to measure/validate human alertness. Response time metrics like Mean reaction time (RT) and Mean of 1/RT suffer from lower range and resolution in case of shorter versions of Response time tasks (
Source: Chronobiology International - August 9, 2019 Category: Biology Authors: Gupta S, Mayaluri L, Panda N, Gupta S Tags: Chronobiol Int Source Type: research

Associations between social jetlag and mental health in young people: A systematic review.
Abstract Adolescence and early adulthood (collectively categorized as "young people") is a transitional period associated with a number of key physiological, social and psychological changes. Sleep difficulties, notable in this age group, may adversely affect physical and mental health. Of interest is the impact of the natural shift in young people towards a more evening-type sleep pattern (chronotype), whilst social constraints encourage early waking to fit with school/work timings. This leads to a misalignment in sleep timing between weekdays and weekends, known as social jetlag, which may contribute t...
Source: Chronobiology International - August 7, 2019 Category: Biology Authors: Henderson SEM, Brady EM, Robertson N Tags: Chronobiol Int Source Type: research

Effects of work schedule and period of exposure on changes in urinary chromium and nickel excretion among rotating shift workers in a stainless-steel plant.
Abstract We investigated the association between the period of exposure and changes in urinary excretion of chromium and nickel among rotating shift workers in a stainless-steel plant. The study participants were composed of two groups: the workers who were occupationally exposed to metals ("exposed group") and those who were not occupationally exposed to metals ("unexposed group"). The exposed and unexposed groups consisted of 56 and 40 male rotating shift workers, respectively. Urine samples were collected immediately before and immediately after the day shift, evening shift, and night shift....
Source: Chronobiology International - August 1, 2019 Category: Biology Authors: Itoh H, Wang RS, Maki S, Niu Q, Shang H, Su Y, Weng Z, Saito H, Miura N, Takahashi M Tags: Chronobiol Int Source Type: research

The effects of lunar cycle on the diurnal variations of short-term maximal performance, mood state, and perceived exertion.
Abstract The aim of this study was to explore the effect of the lunar cycle and time of day on short-term maximal performance, wellness and mood state. Twenty healthy active men performed a running anaerobic sprint test (RAST) at four sessions (full moon (FM) and new moon (NM) in the morning and in the evening). Before each testing session, participants completed a rating scale of mood states (POMS) and a psychometric rating scale of perceived wellness (Hooper's questionnaire). Rating of perceived exertion (RPE) was collected just after the RAST. A higher rating of sleep was observed in FM compared to NM upon the ...
Source: Chronobiology International - August 1, 2019 Category: Biology Authors: Dergaa I, Fessi MS, Chaabane M, Souissi N, Hammouda O Tags: Chronobiol Int Source Type: research

Effect of napping opportunity at different times of day on vigilance and shuttle run performance.
Abstract The aim of the present study was to examine the effect of a nap opportunity during the daytime realized at different times of day on physical and mental performance. Eighteen physically active males (age: 20.5 ± 3.0 years, height: 175.3 ± 5.9 cm, body-mass: 70.0 ± 8.6 kg) were tested under four experimental conditions: no-nap condition, nap at 13h00, nap at 14h00 and nap at 15h00. All nap durations were of 25-min and all tests were performed at 17h00. They performed a 5-m shuttle run test, which generated measures of the highest distance (HD) and tot...
Source: Chronobiology International - August 1, 2019 Category: Biology Authors: Abdessalem R, Boukhris O, Hsouna H, Trabelsi K, Ammar A, Taheri M, Irandoust K, Hill DW, Chtourou H Tags: Chronobiol Int Source Type: research

Circadian preference and relationship satisfaction among three types of couples.
ano C Abstract Mate selection is part of a growing interest in the study of processes by which couples are established, consolidated and/or separated. Similarity in psychological traits has been related to the well-being of couples, but given the possible effect of temporal convergence, it is necessary to control for the relationship length and whether or not both members of the couple live together. The aim of this study was to analyse the association between Morningness/Eveningness (M/E) similarity and relationship satisfaction in young-dating-non-cohabiting, young-married-cohabiting and old-married-cohabiting c...
Source: Chronobiology International - August 1, 2019 Category: Biology Authors: Díaz-Morales JF, Parra-Robledo Z, Escribano C Tags: Chronobiol Int Source Type: research

Social rhythm regularity moderates the relationship between sleep disruption and depressive symptoms in veterans with post-traumatic stress disorder and major depressive disorder.
Abstract Approximately 50% to 80% of individuals with posttraumatic stress disorder (PTSD) also meet criteria for major depressive disorder (MDD). Sleep disturbance is a major concern in both PTSD and MDD, and is associated with poor treatment response, poor functional outcome and increased suicide risk. Social rhythm regularity, or the consistency of daily habitual behaviors, is theoretically linked to circadian rhythms and may be disturbed in both PTSD and MDD. The present study examined the relationship between social rhythm regularity, sleep disruption and MDD and PTSD symptoms in a sample of veterans with com...
Source: Chronobiology International - August 1, 2019 Category: Biology Authors: Boland EM, Goldschmied JR, Kelly MR, Perkins S, Gehrman PR, Haynes PL Tags: Chronobiol Int Source Type: research

Spatiotemporal variability in activity patterns of urban street cattle as function of environmental factors.
Abstract In the current study, we studied behavioral patterns, such as foraging, activity, standing, and laying in a population of cattle wandering on streets of Raipur city. We also determined the effects of four environmental factors (temperature, humidity, light, and noise intensities) on these behaviors. We recorded all four behavioral variables at four time points each day over a period of three consecutive days at 10 randomly selected locations using on-site human observation method, digital video, and still camera. We used Cosinor rhythmometry to analyze the time series data on all four behavioral variables...
Source: Chronobiology International - August 1, 2019 Category: Biology Authors: Sahu BK, Parganiha A, Pati AK Tags: Chronobiol Int Source Type: research

Lipid peroxidation depends on the clock 3111T/C gene polymorphism in menopausal women with Insomnia.
Abstract A comparative analysis of lipid peroxidation processes and antioxidant defense system in Caucasian menopausal women with/without insomnia depending on the genotype of Clock 3111T/C gene polymorphism was performed. Two hundred and fourteen Caucasian menopausal women divided into control (without insomnia) and main group (with insomnia) were examined. Lipid peroxidation (conjugated dienes, thiobarbituric acid reactants) and antioxidant defense system parameters (?-tocopherol, retinol, reduced and oxidized glutathione, glutathione S-transferase, glutathione peroxidase, glutathione reductase, superoxide dismu...
Source: Chronobiology International - August 1, 2019 Category: Biology Authors: Semenova N, Madaeva I, Bairova T, Kolesnikov S, Kolesnikova L Tags: Chronobiol Int Source Type: research

Advanced melatonin onset relative to sleep in women with unmedicated major depressive disorder.
This study examined circadian timing in a sample of unmedicated women with and without unipolar major depressive disorder. Participants were aged 18-28 years, had no comorbid medical conditions, and were not taking medications. Eight women were experiencing a major depressive episode, nine had previously experienced an episode, and 31 were control participants with no history of mental illness. Following at least one week of actigraphic sleep monitoring, timing of salivary dim light melatonin onset (DLMO) was assessed in light of
Source: Chronobiology International - August 1, 2019 Category: Biology Authors: Coleman MY, McGlashan EM, Vidafar P, Phillips AJK, Cain SW Tags: Chronobiol Int Source Type: research