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Chronobiology International

Ellis J Brotherton, Sarah E Moseley, Carl Langan-Evans, Samuel A Pullinger, Colin M Robertson, Jatin G Burniston, Ben J Edwards
We have investigated the effects that sleep restriction (3-h sleep during two consecutive nights) have on an evening (17:00 h) submaximal weightlifting session; and whether this performance improves following a 1-h post-lunch powernap. Fifteen resistance-trained males participated in this study. Before the experimental protocol commenced, 1RM bench press and inclined leg press and normative habitual sleep were recorded. Participants were familiarised with the testing protocol, then completed three experimental conditions with two nights of prescribed sleep: (i) Normal (N): retire at 23:00 h and wake at 06:30 h, (ii) partial sleep-deprivation (SD): retire at 03:30 h and wake at 06:30 h and (iii) partial sleep-deprivation with nap (SDN ): retire at 03:30 h and wake at 06:30 h with a 1-h nap at 13:00 h...
January 10, 2019: Chronobiology International
Julie Sletten, Agnethe Lund, Cathrine Ebbing, Germaine Cornelissen, Jörg Aßmus, Torvid Kiserud, Susanne Albrechtsen, Jörg Kessler
Circadian rhythmicity is fundamental to human physiology, and is present even during fetal life in normal pregnancies. The impact of maternal endocrine disease on the fetal circadian rhythm is not well understood. The present study aimed to determine the fetal circadian rhythm in pregnancies complicated by pregestational diabetes mellitus (PGDM), compare it with a low-risk reference population, and identify the effects of maternal glycemic control and morning cortisol concentrations. Long-term fetal electrocardiogram recordings were made in 40 women with PGDM at 28 and 36 weeks of gestation...
January 8, 2019: Chronobiology International
Julia Ribeiro da Silva Vallim, Fernanda Gaspar do Amaral, José Cipolla-Neto, Vânia D'Almeida
Fabry disease is a progressive disease characterized by an enzymatic deficiency of acid alpha-galactosidase and glycosphingolipids storage within the lysosomes. The disease has two phenotypes: classic and nonclassic. Excessive daytime sleepiness is a common sign reported by patients and can be caused by a circadian rhythm sleep disorder. Activity and rest cycle, variation of body temperature and melatonin biosynthesis are known rhythmicity markers. In the face of these evidences, our goal was to evaluate the rhythmic profile in Fabry's disease patients using rhythmicity markers...
January 7, 2019: Chronobiology International
Demirhan Eda, Önder Ismail, Horzum Mehmet, Masal Ercan, Şenol Beşoluk
Morningness-eveningness is an individual difference that is related with various traits such as behavioral problems, personality, and health. The aim of the current study is to adopt the Morningness-Eveningness Stability Scale improved (MESSi) which is a novel assessment tool that consists of subscales of morning affect (MA), eveningness (EV), and distinctness (DI) into Turkish. Concurrent validity of the MESSi along with Big five inventory (BIG-5), Subjective alertness level, Pittsburg Sleep Quality Index (PSQI), Positive and Negative Affect Schedule (PANAS) were analyzed...
January 7, 2019: Chronobiology International
Katarina Danielsson, Aysegül Sakarya, Markus Jansson-Fröjmark
During puberty, there is a delay in sleep patterns and the circadian clock, and the prevalence of sleep difficulties is high among young adults. Thus, it is important to be able to measure chronotype (CT) in this group, both in the clinic and for broader epidemiological studies, to better understand the sleep difficulties observed. The reduced version of one of the most widely used questionnaire to measure CT, the Horne & Östberg Morningness-Eveningness Questionnaire (MEQ), has been developed and validated in many languages...
January 7, 2019: Chronobiology International
Samuel Pullinger, Colin M Robertson, Aiden J Oakley, Robert Hobbs, Michael Hughes, Jatin G Burniston, Ben J Edwards
The present study investigated the magnitude of diurnal variation in back squat and bench press using the MuscleLab linear encoder over three different loads and assessed the benefit of an active warm-up to establish whether diurnal variation could be negated. Ten resistance-trained males underwent (mean ± SD: age 21.0 ± 1.3 years, height 1.77 ± 0.06 m, and body mass 82.8 ± 14.9 kg) three sessions. These included control morning (M, 07:30 h) and evening (E, 17:30 h) sessions (5-min standardized warm-up at 150 W, on a cycle ergometer), and one further session consisting of an extended active warm-up morning trial (ME , 07:30 h) until rectal temperature (Trec ) reached previously recorded resting evening levels (at 150 W, on a cycle ergometer)...
December 26, 2018: Chronobiology International
Christoph Randler
Case studies have a long tradition in biomedical research. Here, I will analyze an important person from a chronobiological aspect, Santa Claus. Although it might be dangerous for researchers to publish analyses about Santa Claus, because, given the possibility that he may be unsatisfied with my analysis, this could lead to an embargo of parcels for my whole family. Nevertheless, some intrepid researches already diagnosed Santa Claus, ending up in some important research results. A search in Web of Science revealed only N = 224 publications about Santa Claus, which is really low...
December 21, 2018: Chronobiology International
Björn Lemmer
Johann, Heinrich, Ferdinand von Autenrieth [1772-1835], was a teacher of anatomy, physiology and pharmacology at the University of Tübingen, Germany. He was the author of a famous textbook on Physiology and one of the earliest pharmacologists [Öffentlicher Lehrer der Arzneykunst]. In his textbooks, he presented a lot of information that and how biological rhythms influenced physiological functions in the human body, the book was used for his medical lectures for students. He can be regarded as on of the earliest chronophysiologists...
December 21, 2018: Chronobiology International
Fangyi Gu, Elizabeth B Klerman, Sungduk Kim, Steve Moore, Kai Yu, Paul S Albert, Neil E Caporaso
The circadian system influences virtually all biological functions. Understanding the impact of circadian variation on metabolism may provide insight into mechanisms of circadian-associated disorders and guide the implementation of chrono-therapy. Previous research has reported circadian variation in 7-20% of metabolites in human blood. In this study, untargeted metabolomics profiles were measured using blood of two healthy men and one healthy woman, collected every 2 h for up to 48 h under carefully controlled conditions...
December 17, 2018: Chronobiology International
Raphael Saffroy, Genevieve Lafaye, Christophe Desterke, Elisabeth Ortiz-Tudela, Ammar Amirouche, Pasquale Innominato, Patrick Pham, Amine Benyamina, Antoinette Lemoine
Circadian rhythms have been related to psychiatric diseases and regulation of dopaminergic transmission, especially in substance abusers. The relationship between them remained enigmatic and no data on the role of clock genes on cannabis dependence have been documented. We aimed at exploring the role of clock gene genotypes as potential predisposing factor to cannabis addiction, using a high throughput mass spectrometry methodology that enables the large-scale analysis of the known relevant polymorphisms of the clock genes...
December 11, 2018: Chronobiology International
Thomas C Erren, Philip Lewis
Chronotype, defined as the temporal phenotype of an organism, has been addressed in Chronobiology International in some 200 publications between 1997 and 2018. Readers may thus be interested in what roles chronotype may play in studies concerning chronobiology and health. In line with Karl Popper, our objective is to synthesize terms and concepts for falsifiable experimental, field, and ultimately epidemiological research. To this end, we offer 17 building blocks where each should follow from one or more others...
December 4, 2018: Chronobiology International
Silvia A Tafoya, Vania Aldrete-Cortez, Silvia Ortiz, Claudia Fouilloux, Felipe Flores, Ana M Monterrosas
The medical career is considered highly stressful, especially during internships when academic and clinical demands, combined with changes in sleep patterns, increase students' likelihood to develop depression. Resilience, which is considered as opposite vulnerability to stress and, along with another protective factor, namely morningness, may cause a student to be less reactive to stimuli and, therefore, less prone to depression. The objective of this study was to evaluate the role of resilience and morningness facing to sleep quality and main risk factors, on the development of depression symptoms in a group of students with sleep pattern alterations...
December 4, 2018: Chronobiology International
Rika Miyagi, Yuh Sasawaki, Hideuki Shiotani
The notion that sedentary behavior is harmful to human health is widespread. Little is known about the short term influence of sedentary behavior on heart rate (HR) and heart rate variability (HRV) circadian rhythms. Therefore the purpose of the present study was to examine the influence of short term sedentary behavior on the circadian rhythms of HR and HRV using cosine periodic regression analysis. Sixteen healthy young students were included in a randomized crossover study. All subjects underwent 24-h ECG Holter monitoring in two different states of physical activity, an active condition (more than 15,000 steps per day) and a sedentary condition (less than 1,000 steps per day)...
December 3, 2018: Chronobiology International
Amanda Neumann Reyes, Mariane Lopez Molina, Karen Jansen, Suelen De Lima Bach, Paulinia Leal Do Amaral, Bárbara Coiro Spessato, Ricardo Azevedo da Silva
Emotional and behavioral problems have been considered an indicative of mental disorder in children. Mental health problems affect 10-20% of children and adolescents living in low-income and middle-income countries. Evidence suggests that disruptions in the biological rhythm may be a primary cause of emotional and behavioral changes, which affects several psychological functions and moods. Thus, this study aimed at verifying the association between biological rhythm and emotional and behavioral problems in schoolchildren living in Southern Brazil...
December 3, 2018: Chronobiology International
Carlos Gallegos, Aída García, Candelaria Ramírez, Jorge Borrani, Carolina V M Azevedo, Pablo Valdez
An important property of attention is the limitation to process new information after responding to a stimulus. This property of attention can be evaluated by the Attentional Blink (AB), a phenomenon that consists of a failure to detect the second of two targets when the interval between them is 200-500 ms. The aim of the present work is to determine the possible existence of time awake (homeostatic changes) and time of day (circadian rhythm) variations in the AB. Eighteen undergraduate students, 11 men and 7 women, age = 18...
November 29, 2018: Chronobiology International
Júlio A Costa, João Brito, Fábio Y Nakamura, Pedro Figueiredo, Eduardo Oliveira, António Rebelo
The aim of the current study was to analyze the influence of the timing of training and matches, and match location, on sleep pattern and nocturnal cardiac autonomic activity in female soccer players. A total of 17 female soccer players (age: 21.6 ± 2.3 years; mean ± SD) wore wrist actigraph units and heart rate (HR) monitors during night-sleep throughout 18 night-training days (NTD), 18 resting days (RD), and 6 match-days (MD; 3 away-matches [AM] and 3 home-matches [HM]) of the competitive period. Training load was quantified by session rating of perceived exertion (sRPE), heart rate (HR), training impulse (TRIMP), and subjective well-being...
November 18, 2018: 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
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