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Chronobiology International

Chenlu Gao, Taylor Terlizzese, Michael K Scullin
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. One prominent example is the debate regarding whether sleep loss and later bedtimes affect classroom learning more in female or male students...
November 8, 2018: Chronobiology International
Jessica R Lunsford-Avery, Scott H Kollins, Vijay A Mittal
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...
November 8, 2018: Chronobiology International
Kleber Dos Santos, Frida Marina Fischer, Dalton Francisco de Andrade, Pedro Alberto Barbetta, Maria Regina Alves Cardoso, Rodolfo Andrade de Gouveia Vilela
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. We used the data from a census that covered more than 90% (N = 1648) of the nurses from the main institute of the largest public hospital complex of Brazil...
November 7, 2018: Chronobiology International
Jing Rong, Mark Zhu, Jacob Munro, Jillian Cornish, Geraldine M McCarthy, Nicola Dalbeth, Raewyn C Poulsen
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). The chondrocyte clock is also altered. Specifically, the peak level of PER2 is elevated, but peak level of BMAL1 reduced in osteoarthritic chondrocytes. The purpose of this study was to determine whether increased PER2 expression causes disease-associated changes in chondrocyte activity and to identify whether known risk factors for osteoarthritis induce changes in PER2 and BMAL1 expression...
November 7, 2018: Chronobiology International
Yoko Komada, Yuko Ikeda, Makoto Sato, Azusa Kami, Chika Masuda, Shigenobu Shibata
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. However, the relationship between social jetlag (SJL) and menstrual symptoms/menstrual cycle has not been elucidated. In this study, we aimed to elucidate this relationship among female university students...
November 5, 2018: Chronobiology International
Angela J Pereira-Morales, Leandro P Casiraghi, Ana Adan, Andrés Camargo
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...
November 5, 2018: Chronobiology International
Jamie E M Byrne, Ben Bullock, Aida Brydon, Greg Murray
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. The overarching aim of the current project was to investigate the validity and reliability of the questionnaire. Here, we report on associations investigated in three data sets...
November 5, 2018: Chronobiology International
Ludmila Fradkin, Olga Raz, Mona Boaz
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. OBJECTIVE: To compare dietary intake on days on which the participant worked the night shift to days on which she worked the day shift in a population of female nurses who work rotating shifts at a hospital...
November 5, 2018: Chronobiology International
Rodrigo Fortes-Silva, Fabiola De Oliveira Paes Leme, Túlio Pacheco Boaventura, Helena Corrêa Pinto De Mendonça, Jane Prado Leite Moreira, Pedro Hugo Henriques Cunha, Ronald Kennedy Luz
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. The daily rhythms of hematological, biochemical and enzymatic parameters were then measured at six sampling times "zeitgeber time = ZT" at four-hour intervals under light:dark 12:12 h (lights on = ZT0, at 8...
October 29, 2018: Chronobiology International
Mirja Quante, Sara Mariani, Jia Weng, Catherine R Marinac, Emily R Kaplan, Michael Rueschman, Jonathan A Mitchell, Peter James, J Aaron Hipp, Elizabeth M Cespedes Feliciano, Rui Wang, Susan Redline
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. A total of 133 healthy adults, aged 21-60 years, wore a wrist actigraph for 7 consecutive days. We applied a non-parametric analysis to activity counts to derive rest-activity patterns...
October 26, 2018: Chronobiology International
Zothanmawii Renthlei, Tennison Gurumayum, Bijoy Krishna Borah, Amit Kumar Trivedi
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. In birds, three independent circadian clocks reside within the nervous tissues in the hypothalamus, pineal and retina, which interact with each other and produce circadian time at a functional level...
October 26, 2018: Chronobiology International
Trinitat Cambras, Eva Pardina, Júlia Carmona, David Ricart-Jané, Antonio Miñarro, Roser Ferrer, Albert Lecube, José María Balibrea, Enric Caubet, Oscar González, Ramón Vilallonga, Jose Manuel Fort, Elena Cuello, Juan A Baena-Fustegueras, Antoni Díez-Noguera, Julia Peinado-Onsurbe
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. Thus, the goal of this study was to observe whether the time of year in which bariatric surgery (BS) took place modulated the changes in several variables related to glucidic and lipid metabolism...
October 23, 2018: Chronobiology International
Haim Abraham, David M Scantlebury, Abed E Zubidat
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. Therefore, we assume that the correct way to deal with it will be by treating the dark night as an ecosystem-service for temporal organization of humans as other organisms...
October 19, 2018: Chronobiology International
Małgorzata Sławińska, Maciej Stolarski, Konrad S Jankowski
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)...
October 19, 2018: Chronobiology International
Leena Tähkämö, Timo Partonen, Anu-Katriina Pesonen
Light is necessary for life, and artificial light improves visual performance and safety, but there is an increasing concern of the potential health and environmental impacts of light. Findings from a number of studies suggest that mistimed light exposure disrupts the circadian rhythm in humans, potentially causing further health impacts. However, a variety of methods has been applied in individual experimental studies of light-induced circadian impacts, including definition of light exposure and outcomes. Thus, a systematic review is needed to synthesize the results...
October 12, 2018: Chronobiology International
Shaunt A Markarian, Daniel J Gildner, Scott M Pickett, Andrew S Warnke
Social anxiety has recently been linked to morningness-eveningness; however, the psychological mechanisms underlying this relationship are not well known. As such, the purpose of the current study is to propose a model by which morningness-eveningness is related to social anxiety symptoms through punishment sensitivity and experiential avoidance within an adult American, community sample recruited via Amazon's Mechanical Turk (MTurk). It was hypothesized that experiential avoidance and punishment sensitivity would be associated with increased social anxiety symptoms and that morningness-eveningness would be negatively related to social anxiety symptoms...
October 12, 2018: Chronobiology International
Agnieszka Bukowska-Damska, Elzbieta Skowronska-Jozwiak, Beata Peplonska
Osteoporosis is an important public health problem worldwide. Among the countries with a very high population risk of fractures, there are those with the highest level of economic development. Osteoporotic fractures are the main cause of disability among elderly people, and the resultant disabilities require particularly large financial support associated not only with the direct treatment of the fracture but also with the necessity for long-term rehabilitation and care for the disabled person. Many well-established factors can have impact on bone mass and fracture risk...
October 12, 2018: Chronobiology International
Magdalena Drezno, Maciej Stolarski, Gerald Matthews
Morningness-eveningness and standard personality traits are associated with well-being but few studies have directly compared the two types of construct as correlates of life satisfaction. Influences on well-being common to both chronotype and personality may include shared biological bases for depression and sleep disturbance, tendencies toward social jetlag, and emotion-regulation mechanisms. The current study tested mediation and moderation hypotheses in a sample of 379 Polish adults. The first hypothesis was that conscientiousness and emotional stability traits would mediate the relationship between morningness and life satisfaction...
October 10, 2018: Chronobiology International
Lorenzo Tonetti, Vincenzo Natale
The aim of this study was to carry out a comparison of the ability to discriminate between extreme chronotypes, i.e., morning- and evening-types, among the Morningness-Eveningness Questionnaire (MEQ) and its reduced version (rMEQ). To this end a secondary analysis of cohort studies, using two different approaches, was carried out. The first, subjective, relied on the computing of overlap between extreme chronotypes according to their hourly ideal bedtime, get-up time and midpoint of sleep reported at the MEQ and rMEQ, while the second, objective, on the corresponding actual-actigraphic times...
October 9, 2018: Chronobiology International
Surbhi, Jeremy C Borniger, Kathryn L G Russart, Ning Zhang, Ulysses J Magalang, Randy J Nelson
Immune signaling is known to regulate sleep. miR-155 is a microRNA that regulates immune responses. We hypothesized that miR-155 would alter sleep regulation. Thus, we investigated the potential effects of miR-155 deletion on sleep-wake behavior in adult female homozygous miR-155 knockout (miR-155KO ) mice and littermate controls (WT). Mice were implanted with biotelemetry units and EEG/EMG biopotentials were recorded continuously for three baseline days. miR-155KO mice had decreased bouts of NREM and REM sleep compared with WT mice, but no differences were observed in the length of sleep bouts or total time spent in sleep-wake states...
October 9, 2018: Chronobiology International
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