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Chronobiology International

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https://www.readbyqxmd.com/read/29341796/correction-to-missed-medical-appointments-during-shifts-to-and-from-daylight-saving-time
#1
(no author information available yet)
No abstract text is available yet for this article.
January 17, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29341791/population-level-evidence-for-seasonality-of-the-human-microbiome
#2
Christina Korownyk, Fangwei Liu, Scott Garrison
The objective of this study is to determine whether human body odors undergo seasonal modulation. We utilized google trends search volume from the United States of America from January 1, 2010 to June 24, 2017 for a number of predetermined body odors. Regression modeling of time series data was completed. Our primary outcome was to determine the proportion of the variability in Internet searches for each unpleasant odor (about the mean) that is explained by a seasonal model. We determined that the seasonal (sinusoidal) model provided a significantly better fit than the null model (best straight line fit) for all searches relating to human body odors (P <...
January 17, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29341789/psychometric-properties-of-the-epworth-sleepiness-scale-a-factor-analysis-and-item-response-theory-approach
#3
June J Pilcher, Fred S Switzer, Alec Munc, Janet Donnelly, Julia C Jellen, Claus Lamm
The purpose of this study is to examine the psychometric properties of the Epworth Sleepiness Scale (ESS) in two languages, German and English. Students from a university in Austria (N = 292; 55 males; mean age = 18.71 ± 1.71 years; 237 females; mean age = 18.24 ± 0.88 years) and a university in the US (N = 329; 128 males; mean age = 18.71 ± 0.88 years; 201 females; mean age = 21.59 ± 2.27 years) completed the ESS. An exploratory-factor analysis was completed to examine dimensionality of the ESS...
January 17, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29341785/total-sleep-deprivation-does-not-significantly-degrade-semantic-encoding
#4
K A Honn, D A Grant, J M Hinson, P Whitney, Hpa Van Dongen
Sleep deprivation impairs performance on cognitive tasks, but it is unclear which cognitive processes it degrades. We administered a semantic matching task with variable stimulus onset asynchrony (SOA) and both speeded and self-paced trial blocks. The task was administered at the baseline and 24 hours later after 30.8 hours of total sleep deprivation (TSD) or matching well-rested control. After sleep deprivation, the 20% slowest response times (RTs) were significantly increased. However, the semantic encoding time component of the RTs remained at baseline level...
January 17, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29300497/association-of-habitual-dietary-intake-with-morningness-eveningness-and-rotating-shift-work-in-japanese-female-nurses
#5
Takahiro Yoshizaki, Taiki Komatsu, Yuki Tada, Azumi Hida, Yukari Kawano, Fumiharu Togo
Rotating shift workers are associated with imbalanced dietary intakes. Rotating shift workers and dietary intakes in adults who do not engage in night work have also been shown to be associated with chronotype. However, no studies have examined associations between morningness-eveningness (i.e., the degree to which people prefer to be active in the morning or the evening), rotating shift work and dietary intakes. Therefore, our first purpose was to elucidate the association between morningness-eveningness and habitual food group intakes in rotating shift workers...
January 4, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29283309/circadian-variations-in-the-clinical-presentation-of-headaches-among-migraineurs-a-study-using-a-smartphone-headache-diary
#6
Jeong-Wook Park, Soo-Jin Cho, Sang-Gue Park, Min Kyung Chu
Migraines occur within certain time frames. Nevertheless, information regarding circadian variation in the clinical presentation of migraine is limited. We investigated circadian variations in the clinical presentation of migraine using a smartphone headache diary (SHD). We enrolled adult participants with the diagnosis of migraine according to the third beta edition of the International Classification of Headache Disorders. Participants were asked to log in to the SHD every day for 90 days to record the occurrence of headaches...
December 28, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29283306/circadian-per2-protein-oscillations-do-not-persist-in-cycloheximide-treated-mouse-embryonic-fibroblasts-in-culture
#7
Motomi Tainaka, Masao Doi, Yuichi Inoue, Iori Murai, Hitoshi Okamura
It is not known whether the endogenous mammalian core clock proteins sustain measurable oscillations in cells in culture where de novo translation is pharmacologically inhibited. We studied here the mammalian core clock protein PER2, which undergoes robust circadian oscillations in both abundance and phosphorylation. With a newly developed antibody that enables tracing the endogenous PER2 protein oscillations over circadian cycles with cultured mouse embryonic fibroblast cells, we provide evidence that PER2 does not persist noticeable circadian rhythms when translation is inhibited...
December 28, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29283292/morphological-molecular-and-hormonal-adaptations-to-early-morning-versus-afternoon-resistance-training
#8
Milan Sedliak, Michal Zeman, Gabriel Buzgó, Jan Cvecka, Dusan Hamar, Eugen Laczo, Monika Okuliarova, Marian Vanderka, Tomas Kampmiller, Keijo Häkkinen, Juha P Ahtiainen, Juha J Hulmi, Tormod S Nilsen, Håvard Wiig, Truls Raastad
It has been clearly established that maximal force and power is lower in the morning compared to noon or afternoon hours. This morning neuromuscular deficit can be diminished by regularly training in the morning hours. However, there is limited and contradictory information upon hypertrophic adaptations to time-of-day-specific resistance training. Moreover, no cellular or molecular mechanisms related to muscle hypertrophy adaptation have been studied with this respect. Therefore, the present study examined effects of the time-of-day-specific resistance training on muscle hypertrophy, phosphorylation of selected proteins, hormonal concentrations and neuromuscular performance...
December 28, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29283286/missed-medical-appointments-during-shifts-to-and-from-daylight-saving-time
#9
David A Ellis, Kirk Luther, Rob Jenkins
Transitions into and out of Daylight Saving Time (DST) can provide insights into how a minor change to a regular sleep-wake cycle can inadvertently affect health. We examined the relationship between DST and missed medical appointments. Using a large dataset, the proportion of missed appointments were examined prior and post spring and autumn clock changes. As predicted, the number of missed medical appointments significantly increased following the spring (forward) clock change and the week of the clock change...
December 28, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29283283/epidemiology-of-objectively-measured-bedtime-and-chronotype-in-us-adolescents-and-adults-nhanes-2003-2006
#10
Jacek K Urbanek, Adam P Spira, Junrui Di, Andrew Leroux, Ciprian Crainiceanu, Vadim Zipunnikov
BACKGROUND: We propose a method for estimating the timing of in-bed intervals using objective data in a large representative US sample, and quantify the association between these intervals and age, sex, and day of the week. METHODS: The study included 11,951 participants 6 years and older from the National Health and Nutrition Examination Survey (NHANES) 2003-2006, who wore accelerometers to measure physical activity for seven consecutive days. Participants were instructed to remove the device just before the nighttime sleep period and put it back on immediately after...
December 28, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29271671/impact-of-heart-specific-disruption-of-the-circadian-clock-on-systemic-glucose-metabolism-in-mice
#11
Tomomi Nakao, Akira Kohsaka, Tsuyoshi Otsuka, Zaw Lin Thein, Hue Thi Le, Hidefumi Waki, Sabine S Gouraud, Hayato Ihara, Masako Nakanishi, Fuyuki Sato, Yasuteru Muragaki, Masanobu Maeda
The daily rhythm of glucose metabolism is governed by the circadian clock, which consists of cell-autonomous clock machineries residing in nearly every tissue in the body. Disruption of these clock machineries either environmentally or genetically induces the dysregulation of glucose metabolism. Although the roles of clock machineries in the regulation of glucose metabolism have been uncovered in major metabolic tissues, such as the pancreas, liver, and skeletal muscle, it remains unknown whether clock function in non-major metabolic tissues also affects systemic glucose metabolism...
December 22, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29260917/how-have-our-clocks-evolved-adaptive-and-demographic-history-of-the-out-of-african-dispersal-told-by-polymorphic-loci-in-circadian-genes
#12
Arcady A Putilov, Vladimir B Dorokhov, Michael G Poluektov
The mechanism of the molecular circadian clocks is currently understood as a transcription/translation feedback loop involving more than ten genes. Genetic variation at some of loci in these genes has been shaped by adaptation to environmental factors. In particular, latitudinal clines in allele frequency were documented in several animal species, but the contradictory conclusions were drawn from the results of rare human studies. Here we tested whether the out-of-African dispersal of human populations to higher latitudes of the Eurasian continent was associated with latitude-dependent shifts in allele frequency at polymorphic loci in genes of three (reference, circadian and skin pigmentation) groups...
December 20, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29260907/morning-bright-light-exposure-has-no-influence-on-self-chosen-exercise-intensity-and-mood-in-overweight-individuals-a-randomized-controlled-trial
#13
Raphael Knaier, Christopher Klenk, Karsten Königstein, Timo Hinrichs, Anja Rossmeissl, Denis Infanger, Christian Cajochen, Arno Schmidt-Trucksäss
Overweight is a worldwide increasing public health issue. Physical exercise is a useful countermeasure. Overweight individuals choose rather low exercise intensities, but especially high exercise intensities lead to higher energy expenditure and show beneficial health effects compared to lower exercise intensities. However, especially in the morning higher exercise intensities are likely to be avoided due to higher subjective effort. Bright light exposure has shown to increase maximum performance. The aim of this study was to investigate if bright light exposure can also increase self-chosen exercise intensity...
December 20, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29260906/gender-differences-in-sleep-habits-and-quality-and-daytime-sleepiness-in-elementary-and-high-school-teachers
#14
Jane Carla de Souza, Maria Luiza Cruz de Oliveira, Ivanise Cortez de Sousa, Carolina V M de Azevedo
The extensive workload of teachers inside and outside the classroom may contribute to sleep problems. Such problems may occur more frequently in women due to the combination of professional demands, domestic tasks, and their relatively greater sleep needs compared to men. The objective of this cross-sectional study was to evaluate the influence of gender on sleep habits and quality, and daytime sleepiness in a sample of 243 teachers (77 men and 166 women) using questionnaires. Linear regression models were used to examine the effect of gender on sleep measures; the unadjusted model considered only gender and the adjusted model considered chronotype and work characteristics as potential confounders...
December 20, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29235907/a-validation-study-of-fitbit-charge-2%C3%A2-compared-with-polysomnography-in-adults
#15
Massimiliano de Zambotti, Aimee Goldstone, Stephanie Claudatos, Ian M Colrain, Fiona C Baker
We evaluated the performance of a consumer multi-sensory wristband (Fitbit Charge 2™), against polysomnography (PSG) in measuring sleep/wake state and sleep stage composition in healthy adults. In-lab PSG and Fitbit Charge 2™ data were obtained from a single overnight recording at the SRI Human Sleep Research Laboratory in 44 adults (19-61 years; 26 women; 25 Caucasian). Participants were screened to be free from mental and medical conditions. Presence of sleep disorders was evaluated with clinical PSG...
December 13, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29231764/relevance-of-chronotype-for-eating-patterns-in-adolescents
#16
Sarah Roßbach, Tanja Diederichs, Ute Nöthlings, Anette E Buyken, Ute Alexy
During adolescence, a shift from morningness to eveningness occurs, yet school continues to start early in the morning. Hence, adolescents are at risk for social jetlag, i.e. a discrepancy between biological and social timing. It remains to be determined whether chronotype associates with daily and daytime-specific eating patterns during this potentially critical period. Therefore, the aim of the present study was to investigate whether chronotype is decisive for daily eating patterns [total energy intake (TEI, kcal), total macronutrient intake (% of TEI), eating occasion frequency (n/day), meal frequency (n/day), snack frequency (n/day), duration of nightly fasting], or daytime-specific eating patterns [morning (before 11 am) energy intake (% of TEI), morning macronutrient intake (% of morning energy intake), regular breakfast skipping (no morning energy intake at least on 2 of 3 days, yes/no), evening (after 6 pm) energy intake (% of TEI), evening macronutrient intake (% of evening energy intake), regular dinner skipping (no evening energy intake at least on 2 of 3 days, yes/no)] in German adolescents...
December 12, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29231753/rates-of-insufficiency-and-deficiency-of-vitamin-d-levels-in-elite-professional-male-and-female-skiers-a-chronobiologic-approach
#17
Jacopo Antonino Vitale, Giovanni Lombardi, Luca Cavaleri, Rosa Graziani, Herbert Schoenhuber, Antonio La Torre, Giuseppe Banfi
Vitamin D is essential for the maintenance and promotion of musculoskeletal health, for the functioning of the immune, cardiovascular and reproductive systems, and its main action is to keep calcium and phosphate plasmatic physiological concentrations at intestinal, renal and bony level. Vitamin D affects several parameters related to physical performance too and a particularly high percentage of vitamin D insufficiency and deficiency in professional athletes has been observed. Several variables are able to impair the synthesis of 25(OH)D in athletes, specifically both genetic and environmental factors, but the most probable explanation for the deficient/insufficient vitamin D levels is the insufficient ultraviolet B light (UVB) exposure during winter...
December 12, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29231749/individual-differences-in-chronotypes-associated-with-academic-performance-among-chilean-university-students
#18
Macarena Valladares, Rodrigo Ramírez-Tagle, Miss Alexandra Muñoz, Ana María Obregón
A chronotype is an individual trait that determines circadian rhythm (dark/light cycle) characteristics, associated with bedtime, waking, and other daily activities. A chronotype is classified as morning, intermediate, and evening. The objective is to associate chronotypes with academic performance in university students. A cross-sectional study was performed to evaluate the chronotype of university students (n = 703) by Horne-Ostberg questionnaire and associated with academic performance. The group with higher GPAs had higher chronotype scores (p = 0...
December 12, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29231745/persistence-of-social-jetlag-and-sleep-disruption-in-healthy-young-adults
#19
Daria M McMahon, James B Burch, Michael D Wirth, Shawn D Youngstedt, James W Hardin, Thomas G Hurley, Steven N Blair, Gregory A Hand, Robin P Shook, Clemens Drenowatz, Stephanie Burgess, James R Hebert
Sleep disruption has been associated with increased risks for several major chronic diseases that develop over decades. Differences in sleep/wake timing between work and free days can result in the development of social jetlag (SJL), a chronic misalignment between a person's preferred sleep/wake schedule and sleep/wake timing imposed by his/her work schedule. Only a few studies have examined the persistence of SJL or sleep disruption over time. This prospective investigation examined SJL and sleep characteristics over a 2-year period to evaluate whether SJL or poor sleep were chronic conditions during the study period...
December 12, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29219626/eveningness-is-associated-with-skipping-breakfast-and-poor-nutritional-intake-in-brazilian-undergraduate-students
#20
Gabriela Pereira Teixeira, Maria Carliana Mota, Cibele Aparecida Crispim
Some studies have proposed that self-reported eveningness, which reflects the preference of performing activities in the evening, may harm nutritional health and influence the eating behavior and nutritional status of individuals. However, the relationship between these variables (eveningness and nutritional status) and the consumption of breakfast, which is currently considered a marker of health, has been insufficiently explored by studies. The aim of this study was to investigate, in undergraduate students, the association between diurnal preference, being overweight, and food consumption (with special focus on breakfast)...
December 8, 2017: Chronobiology International
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