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Chronobiology International

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https://www.readbyqxmd.com/read/27906554/sleep-quality-and-high-intensity-interval-training-at-two-different-times-of-day-a-crossover-study-on-the-influence-of-the-chronotype-in-male-collegiate-soccer-players
#1
Jacopo A Vitale, Matteo Bonato, Letizia Galasso, Antonio La Torre, Giampiero Merati, Angela Montaruli, Eliana Roveda, Franca Carandente
The influence of the chronotype on the sleep quality in male collegiate soccer players in response to acute high intensity interval training (HIIT) performed at two different times of day was evaluated. The sleep quality was poorer in the morning-type than in the evening-type players after the evening HIIT session, whereas no significant changes in the sleep quality of the two chronotypes after the morning HIIT session was observed. The results suggest that an athlete's chronotype should be taken into account when scheduling training sessions and to promote faster recovery processes...
December 1, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27906548/circadian-fluctuations-in-circulating-plasminogen-activator-inhibitor-1-are-independent-of-feeding-cycles-in-mice
#2
Katsutaka Oishi, Naoki Ohkura, Yuki Yasumoto, Saori Yamamoto
To evaluate the involvement of the day-night feeding cycle in the circadian regulation of circulating plasminogen activator inhibitor-1 (PAI-1) concentrations, mice were fed with a diet for eight hours during either daytime (DF) or nighttime (NF) for one week. The reversed feeding cycle did not affect the circadian phases of plasma PAI-1 levels as well as the nocturnal wheel-running activity, although the phase of Pai-1 mRNA expression was significantly advanced for 8.6 hours in the livers of DF, compared with NF mice...
December 1, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27830946/seven-day-human-biological-rhythms-an-expedition-in-search-of-their-origin-synchronization-functional-advantage-adaptive-value-and-clinical-relevance
#3
Alain E Reinberg, Laurence Dejardin, Michael H Smolensky, Yvan Touitou
This fact-finding expedition explores the perspectives and knowledge of the origin and functional relevance of the 7 d domain of the biological time structure, with special reference to human beings. These biological rhythms are displayed at various levels of organization in diverse species - from the unicellular sea algae of Acetabularia and Goniaulax to plants, insects, fish, birds and mammals, including man - under natural as well as artificial, i.e. constant, environmental conditions. Nonetheless, very little is known about their derivation, functional advantage, adaptive value, synchronization and potential clinical relevance...
November 10, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27813687/the-effects-of-a-transcontinental-flight-on-markers-of-coagulation-and-fibrinolysis-in-healthy-men-after-vigorous-physical-activity
#4
Brian R Kupchak, William J Kraemer, David R Hooper, Cathy Saenz, Lexie L Dulkis, Paul J Secola, Lee E Brown, Andrew J Galpin, Jared W Coburn, William H DuPont, Lydia K Caldwell, Jeff S Volek, Carl M Maresh
PURPOSE: Athletes and military service members are known to undergo strenuous exercise and sometimes have to take long haul flights soon afterwards; however, its combined effect on many physiological functions is relatively unknown. Therefore, we examined the combined effects of a full-body muscle-damaging workout and transcontinental flight on coagulation and fibrinolysis in healthy, resistance trained men. We also determined the efficacy of a full-body compression garment in limiting their coagulation responses...
November 4, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27791401/aging-does-not-compromise-in-vitro-oscillation-of-the-suprachiasmatic-nuclei-but-makes-it-more-vulnerable-to-constant-light
#5
Lenka Polidarová, Martin Sládek, Zuzana Novosadová, Alena Sumová
Circadian regulation of behavior worsens with age, however, the mechanism behind this phenomenon is still poorly understood. Specifically, it is not clear to what extend the ability of the circadian clock in the suprachiasmatic nuclei (SCN) to generate the rhythm is affected by aging. This study aimed to ascertain the effect of aging on the functioning of the SCN of mPer2(Luciferase) mice under unnatural lighting conditions, such as constant light (LL). Under LL, which worsened the age-induced effect on behavioral rhythms, a marginal age-dependent effect on in vitro rhythmicity in explants containing the middle, but not the rostral/caudal, regions of the SCN was apparent; the proportion of mice in which middle-region SCN explants were completely arrhythmic or had an extremely long period (>30 h) was 47% in aged mice and 27% in adults...
October 28, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27791399/new-predictors-of-sleep-efficiency
#6
Da Woon Jung, Yu Jin Lee, Do-Un Jeong, Kwang Suk Park
Sleep efficiency is a commonly and widely used measure to objectively evaluate sleep quality. Monitoring sleep efficiency can provide significant information about health conditions. As an attempt to facilitate less cumbersome monitoring of sleep efficiency, our study aimed to suggest new predictors of sleep efficiency that enable reliable and unconstrained estimation of sleep efficiency during awake resting period. We hypothesized that the autonomic nervous system activity observed before falling asleep might be associated with sleep efficiency...
October 28, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27791398/timing-of-glucocorticoid-administration-determines-severity-of-lipid-metabolism-and-behavioral-effects-in-rats
#7
Tao Wu, Jianguo Jiang, Luna Yang, Haifeng Li, Wanjing Zhang, Yangyang Chen, Binggong Zhao, Boda Kong, Ping Lu, Zhenzhen Zhao, Jiawei Zhu, Zhengwei Fu
Glucocorticoids (GCs) are a group of steroid hormones secreted by the adrenal glands in circadian cycles, and the dysregulation of GC signaling has been suggested to cause metabolic syndrome. Even though prolonged GC exposure is associated with serious side effects such as metabolic syndrome and central nervous system disorders, the use of GCs in anti-inflammatory and immunosuppressive therapies has been continuously rising. Meanwhile, the exact mechanisms by which GCs can influence the lipid metabolism as well as behavior and how they are affected by time remain unknown...
October 28, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27791397/economic-decision-making-in-morning-evening-type-people-as-a-function-of-time-of-day
#8
Angel Correa, Noelia Ruiz-Herrera, Maria Ruz, Lorenzo Tonetti, Monica Martoni, Marco Fabbri, Vincenzo Natale
Decision-making is affected by psychological factors like emotional state or cognitive control, which may also vary with circadian rhythmicity. Here, we tested the influence of chronotype (32 morning-type versus 32 evening-type) and time of day (9 a.m. versus 5 p.m.) on interpersonal decision-making as measured by the Ultimatum Game. Participants had to accept or reject different economic offers proposed by a virtual participant. Acceptance involved distribution of gains as proposed, whereas rejection resulted in no gain for either player...
October 28, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27791394/differential-influence-of-asynchrony-in-early-and-late-chronotypes-on-convergent-thinking
#9
Péter Simor, Bertalan Polner
Eveningness preference (late chronotype) was previously associated with different personality dimensions and thinking styles that were linked to creativity, suggesting that evening-type individuals tend to be more creative than the morning-types. Nevertheless, empirical data on the association between chronotype and creative performance is scarce and inconclusive. Moreover, cognitive processes related to creative thinking are influenced by other factors such as sleep and the time of testing. Therefore, our aim was to examine convergent and divergent thinking abilities in late and early chronotypes, taking into consideration the influence of asynchrony (optimal versus nonoptimal testing times) and sleep quality...
October 28, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27791392/impact-of-ataxin-2-knock-out-on-circadian-locomotor-behavior-and-per-immunoreaction-in-the-scn-of-mice
#10
Martina Pfeffer, Suzana Gispert, Georg Auburger, Helmut Wicht, Horst-Werner Korf
In Drosophila melanogaster, Ataxin-2 is a crucial activator of Period and is involved in the control of circadian rhythms. However, in mammals the function of Ataxin-2 is unknown despite its involvement in the inherited neurogenerative disease Spinocerebellar Ataxia type 2 in humans. Therefore, we analyzed locomotor behavior of Atxn2-deficient mice and their WT littermates under entrained- and free-running conditions as well as after experimental jet lag. Furthermore, we compared the PER1 and PER2 immunoreaction (IR) in the SCN...
October 28, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27736199/morningness-eveningness-and-affective-temperaments-assessed-by-the-temperament-evaluation-of-memphis-pisa-and-san-diego-autoquestionnaire-temps-a
#11
Adrian Andrzej Chrobak, Anna Tereszko, Daria Dembinska-Krajewska, Aleksandra Arciszewska, Marcin Siwek, Dominika Dudek, Janusz Rybakowski
Chronotype is a stable trait presenting one's circardian preference. Since chronotype disturbances are common in patients with affective disorders, our aim is to evaluate chronotypes related to affective temperaments, measured with the temperament evaluation of Memphis, Pisa and San Diego-Autoquestionnaire (TEMPS-A). The study included 618 subjects (151 men and 467 women) within the framework of web-based design. They all fulfilled a questionnaire, consisting of the Composite Scale of Morningness (CSM), Sleep Wake Pattern Assessment Questionnaire (SWPAQ), and the TEMPS-A scale...
October 13, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27736193/circadian-rhythm-in-qt-interval-is-preserved-in-mice-deficient-of-potassium-channel-interacting-protein-2
#12
Lisa A Gottlieb, Anniek Lubberding, Anders Peter Larsen, Morten B Thomsen
Potassium Channel Interacting Protein 2 (KChIP2) is suggested to be responsible for the circadian rhythm in repolarization duration, ventricular arrhythmias, and sudden cardiac death. We investigated the hypothesis that there is no circadian rhythm in QT interval in the absence of KChIP2. Implanted telemetric devices recorded electrocardiogram continuously for 5 days in conscious wild-type mice (WT, n = 9) and KChIP2(-/-) mice (n = 9) in light:dark periods and in complete darkness. QT intervals were determined from all RR intervals and corrected for heart rate (QT100 = QT/(RR/100)(1/2))...
October 13, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27736177/it-s-not-just-what-you-eat-but-when-the-impact-of-eating-a-meal-during-simulated-shift-work-on-driving-performance
#13
Charlotte C Gupta, Jill Dorrian, Crystal L Grant, Maja Pajcin, Alison M Coates, David J Kennaway, Gary A Wittert, Leonie K Heilbronn, Chris B Della Vedova, Siobhan Banks
Shiftworkers have impaired performance when driving at night and they also alter their eating patterns during nightshifts. However, it is unknown whether driving at night is influenced by the timing of eating. This study aims to explore the effects of timing of eating on simulated driving performance across four simulated nightshifts. Healthy, non-shiftworking males aged 18-35 years (n = 10) were allocated to either an eating at night (n = 5) or no eating at night (n = 5) condition. During the simulated nightshifts at 1730, 2030 and 0300 h, participants performed a 40-min driving simulation, 3-min Psychomotor Vigilance Task (PVT-B), and recorded their ratings of sleepiness on a subjective scale...
October 13, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27726448/circadian-rhythms-in-bed-rest-monitoring-core-body-temperature-via-heat-flux-approach-is-superior-to-skin-surface-temperature
#14
Stefan Mendt, Martina Anna Maggioni, Michael Nordine, Mathias Steinach, Oliver Opatz, Daniel Belavý, Dieter Felsenberg, Jochim Koch, Peng Shang, Hanns-Christian Gunga, Alexander Stahn
Continuous recordings of core body temperature (CBT) are a well-established approach in describing circadian rhythms. Given the discomfort of invasive CBT measurement techniques, the use of skin temperature recordings has been proposed as a surrogate. More recently, we proposed a heat-flux approach (the so-called Double Sensor) for monitoring CBT. Studies investigating the reliability of the heat-flux approach over a 24-hour period, as well as comparisons with skin temperature recordings, are however lacking...
October 11, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27690288/the-distribution-of-melanopsin-opn4-protein-in-the-human-brain
#15
Juuso S Nissilä, Satu K Mänttäri, Terttu T Särkioja, Hannu J Tuominen, Timo E Takala, Vesa J Kiviniemi, Raija T Sormunen, Seppo Y O Saarela, Markku J Timonen
Until now, melanopsin (OPN4) - a specialized photopigment being responsive especially to blue light wavelengths - has not been found in the human brain at protein level outside the retina. More specifically, OPN4 has only been found in about 2% of retinal ganglion cells (i.e. in intrinsically photosensitive retinal ganglion cells), and in a subtype of retinal cone-cells. Given that Allen Institute for Brain Science has described a wide distribution of OPN4 mRNA in two human brains, we aimed to investigate whether OPN4 is present in the human brain also at protein level...
September 30, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27668547/ultradian-feeding-in-mice-not-only-affects-the-peripheral-clock-in-the-liver-but-also-the-master-clock-in-the-brain
#16
Satish Sen, Hélène Raingard, Stéphanie Dumont, Andries Kalsbeek, Patrick Vuillez, Etienne Challet
Restricted feeding during the resting period causes pronounced shifts in a number of peripheral clocks, but not the central clock in the suprachiasmatic nucleus (SCN). By contrast, daily caloric restriction impacts also the light-entrained SCN clock, as indicated by shifted oscillations of clock (PER1) and clock-controlled (vasopressin) proteins. To determine if these SCN changes are due to the metabolic or timing cues of the restricted feeding, mice were challenged with an ultradian 6-meals schedule (1 food access every 4 h) to abolish the daily periodicity of feeding...
September 26, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27661138/mechanisms-of-hormonal-regulation-of-the-peripheral-circadian-clock-in-the-colon
#17
Lenka Polidarová, Pavel Houdek, Martin Sládek, Zuzana Novosadová, Jiří Pácha, Alena Sumová
Colonic function is controlled by an endogenous clock that allows the colon to optimize its function on the daytime basis. For the first time, this study provided evidence that the clock is synchronized by rhythmic hormonal signals. In rat colon, adrenalectomy decreased and repeated applications of dexamethasone selectively rescued circadian rhythm in the expression of the clock gene Per1. Dexamethasone entrained the colonic clock in explants from mPer2(Luc) mice in vitro. In contrast, pinealectomy had no effect on the rat colonic clock, and repeated melatonin injections were not able to rescue the clock in animals maintained in constant light...
September 23, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27579732/acute-effects-of-different-light-spectra-on-simulated-night-shift-work-without-circadian-alignment
#18
Markus Canazei, Wilfried Pohl, Harald R Bliem, Elisabeth M Weiss
Short-wavelength and short-wavelength-enhanced light have a strong impact on night-time working performance, subjective feelings of alertness and circadian physiology. In the present study, we investigated acute effects of white light sources with varied reduced portions of short wavelengths on cognitive and visual performance, mood and cardiac output.Thirty-one healthy subjects were investigated in a balanced cross-over design under three light spectra in a simulated night-shift paradigm without circadian adaptation...
August 31, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27571845/actigraphic-motor-activity-during-sleep-from-infancy-to-adulthood
#19
Lorenzo Tonetti, Anat Scher, Osnat Atun-Einy, Moran Samuel, Michele Boreggiani, Vincenzo Natale
A secondary analysis of longitudinal and cohort studies was carried out to quantitatively investigate the motor activity pattern, recorded through actigraphy, during the first six hours of nocturnal sleep. The first study was of longitudinal nature. Ten healthy participants (four females) were monitored three times, at baseline (T1) when they were infants (mean age 7.10 ± 0.32 months), at the first follow-up examination (T2) around 4 months later (mean age 11.20 ± 0.63 months) and at the second follow-up (T3) around three years later, when they were preschoolers (mean age 4...
August 30, 2016: Chronobiology International
https://www.readbyqxmd.com/read/27715323/answer-to-letter-factors-affecting-melatonin-secretion-that-may-change-melatonin-pattern-by-yvan-touitou-michael-h-smolensky-and-alain-reinberg
#20
Joanna Wieczorek, Krzysztof Blazejczyk, Takeshi Morita
No abstract text is available yet for this article.
August 12, 2016: Chronobiology International
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