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Chronobiology International

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https://www.readbyqxmd.com/read/29790788/no-association-of-moon-phase-with-stroke-occurrence
#1
Jori O Ruuskanen, Jussi O T Sipilä, Päivi Rautava, Ville Kytö
Stroke occurrence shows strong correlations with sleep disorders and even subtle sleep disturbances have been shown to affect ischemic stroke (IS) occurrence. Chronobiology also exerts effects, like the morning surge in IS occurrence. Lunar cycles have also been shown to affect sleep and other physiological processes, but studies on moon phases and its possible association with occurrence of stroke are rare and nonconclusive. Therefore, we studied the effects of moon phases on stroke hospitalizations and in-hospital mortality nationwide in Finland in 2004-2014...
May 23, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29787305/functional-changes-of-the-scn-in-spontaneous-hypertension-but-not-after-the-induction-of-hypertension
#2
Ajda Yilmaz, Andries Kalsbeek, Ruud M Buijs
The present study investigates the circadian behavior of spontaneously hypertensive rats (SHRs) during the pre-hypertensive and hypertensive stage, with the aim to gain insight into whether observed changes in the functionality of suprachiasmatic nucleus (SCN) in the hypertensive state are cause or consequence of hypertension. Four types of animals were used in this study: (1) SHRs which develop hypertension genetically; (2) their normotensive controls, Wistar Kyoto rats (WKYs); (3) Wistar rats whereby hypertension was surgically induced (2 Kidney 1 Clamp (2K1C) method); and (4) sham-operated control Wistar rats...
May 22, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29787295/alertness-and-psychomotor-performance-levels-of-marine-pilots-on-an-irregular-work-roster
#3
Philippe Boudreau, Sylvain Lafrance, Diane B Boivin
Fatigue is recognized as an important safety concern in the transportation industry. In this study, our goal was to investigate how circadian and sleep-wake dependent factors influence St-Lawrence River pilots' sleep-wake cycle, alertness and psychomotor performance levels at work. A total of 18 male St-Lawrence River ship pilots were recruited to a 16-21-day field study. Pilots' chronotype, sleepiness and insomnia levels were documented using standardized questionnaires. Their sleep-wake cycle was documented by a sleep-wake log and wrist-worn activity monitoring...
May 22, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29775091/chronotherapy-of-maxacalcitol-on-skin-inflammation-induced-by-topical-12-o-tetradecanoylphorbol-13-acetate-in-mice
#4
Daisuke Yoshioka, Hitoshi Ando, Kentaro Ushijima, Masafumi Kumazaki, Akio Fujimura
In general, chronotherapy is desirable for a more effective and/or safe dosage regimen. In this study, a daily rhythm of skin vitamin D receptor (VDR) and chronotherapeutic profiles of maxacalcitol, a vitamin D analogue, were evaluated using mice with skin inflammation induced by topical 12-O-tetradecanoylphorbol-13-acetate (TPA). This study showed that skin nuclear VDR expression in TPA-treated mice has a daily rhythm with the peak at the middle of active period. The effects of maxacalcitol were greater after dosing during early to middle of active period than those after dosing during early to middle of inactive period...
May 18, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29768068/population-level-study-links-short-wavelength-nighttime-illumination-with-breast-cancer-incidence-in-a-major-metropolitan-area
#5
Nataliya Rybnikova, Boris A Portnov
Several population-level studies revealed a positive association between breast cancer (BC) incidence and artificial light at night (ALAN) exposure. However, the effect of short-wavelength illumination, implicated by laboratory research and small-scale cohort studies as the main driving force behind BC-ALAN association, has not been supported by any population-level study carried out to date. We investigated a possible link between BC and ALAN of different subspectra using a multi-spectral year-2011 satellite image, taken from the International Space Station, and superimposing it with year-2013 BC incidence data available for the Great Haifa Metropolitan Area in Israel...
May 16, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29767546/examining-courses-of-sleep-quality-and-sleepiness-in-full-2-weeks-on-2-weeks-off-offshore-day-shift-rotations
#6
V Riethmeister, U Bültmann, M R De Boer, M Gordijn, S Brouwer
To better understand sleep quality and sleepiness problems offshore, we examined courses of sleep quality and sleepiness in full 2-weeks on/2-weeks off offshore day shift rotations by comparing pre-offshore (1 week), offshore (2 weeks) and post-offshore (1 week) work periods. A longitudinal observational study was conducted among N=42 offshore workers. Sleep quality was measured subjectively with two daily questions and objectively with actigraphy, measuring: time in bed (TIB), total sleep time (TST), sleep latency (SL) and sleep efficiency percentage (SE%)...
May 16, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29764221/permanent-night-workers%C3%A2-sleep-and-psychosocial-factors-in-hospital-work-a-comparison-to-day-and-shift-work
#7
Kati Karhula, Tarja Hakola, Aki Koskinen, Anneli Ojajärvi, Mika Kivimäki, Mikko Härmä
We aimed to study whether permanent night workers sleep and psychosocial factors differ from day workers and shift workers. The participants (n = 9 312, 92% females, average age 45 years, most commonly nurses and departmental secretaries) were day workers (DW, n = 2 672), shift workers (SW, n = 6 486) and permanent night workers (PNW, n = 154). The Finnish Public Sector survey responses from six hospital districts from 2012 were combined to payroll data from 91 days preceding the survey. The data were analyzed using Pearson χ2 -test, one-way ANOVA and multinomial logistic regression analysis...
May 15, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29764219/morningness-eveningness-preferences-learning-approach-and-academic-achievement-of-undergraduate-medical-students
#8
Nimra Akram, Naheed Khan, Mehreen Ameen, Shahmeera Mahmood, Komal Shamim, Marium Amin, Qurrat Ul Ain Rana
Several studies have focused on determining the effect of chronotype and learning approach on academic achievement separately indicating that morning types have an academic advantage over the evening types and so have the deep learners over the surface learners. But, surprisingly none have assessed the possible relationship between chronotype and learning approach. So, the current study aimed to evaluate this association and their individual influence on academic performance as indicated by the Cumulative Grade Point Average (CGPA) as well as the effect of their interaction on academic performance...
May 15, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29764218/coping-with-shift-work-related-circadian-disruption-a-mixed-methods-case-study-on-napping-and-caffeine-use-in-australian-nurses-and-midwives
#9
Stephanie Centofanti, Siobhan Banks, Antonietta Colella, Caroline Dingle, Lisa Devine, Helen Galindo, Sophie Pantelios, Gorjana Brkic, Jillian Dorrian
INTRODUCTION: Two of the most ubiquitous fatigue countermeasures used by shift-working nurses are napping and caffeine. This mixed-methods case study investigated the ways nurses and midwives utilised napping and caffeine countermeasures to cope with shift work, and associated sleep, physical health and psychological health outcomes. MATERIALS AND METHODS: N = 130 Australian shift-working nurses and midwives (mean age = 44 years, range = 21-67, 115F, 15M) completed the Standard Shiftwork Index...
May 15, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29764217/chronotype-and-depressive-symptoms-in-students-an-investigation-of-possible-mechanisms
#10
Julia F Van den Berg, Liia Kivelä, Niki Antypa
Individuals with an evening chronotype are at increased risk of experiencing emotional problems, including depressive symptoms. However, the mechanisms underlying these associations remain unclear. The present study aimed to determine whether poor sleep quality, substance use and cognitive emotion regulation difficulties - which have been implicated in the etiology of depression - mediate the relationship between chronotype and depressive symptoms in a student sample, which was assessed cross-sectionally and after 1 year...
May 15, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29764216/payroll-data-based-description-of-working-hours-in-the-danish-regions
#11
Anne Helene Garde, Johnni Hansen, Henrik A Kolstad, Ann Dyreborg Larsen, Jacob Pedersen, Jindong Ding Petersen, Åse Marie Hansen
The aim was to describe the organization of working hours in the Danish regions according to sex, age and calendar year. Based on the Danish Working Hour Database (DWHD), individuals were classified according to schedules: Permanent day (57.8%), evening (1.7%), or night (1.2%); day/evening (22.0%); day/night (6.6%); evening/night (0.6%); and day/evening/night (10.2%). More men (9.1%) than women (5.9%) worked day/night, whereas more women (10.9%) than men (7.4%) worked day/evening/night. More young than older employees worked day/evening/night, and fewer worked permanent day or night...
May 15, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29764215/myotonic-dystrophytype-1-report-of-non-24-h-sleep-wake-disorder-with-excessive-daytime-sleepiness
#12
Lucio Huebra Pimentel Filho, Ana Carolina Dias Gomes, Bruno Gonçalves, Sergio Tufik, Fernando Morgadinho Coelho
Myotonic dystrophy (MD) is a neuromuscular disease with myotonia, progressive weakness, and involvement of CNS, heart, and gastrointestinal system. Excessive daytime sleepiness (EDS) in myotonic dystrophy type 1 (MD1) is related to sleep breathing diseases, restless leg syndrome, periodic limb movements during sleep and narcoleptic-like phenotype. However, authors highlight a central dysfunction of sleep regulation. We describe a 26-year-old, female, MD1 patient with EDS. Sleep diary/actigraphy evidenced two different circadian periods with values of 1442 and 1522 min...
May 15, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29764214/chronotype-influences-response-to-antidepressant-chronotherapeutics-in-bipolar-patients
#13
Sara Dallaspezia, Masahiro Suzuki, Locatelli Clara, Cristina Colombo, Francesco Benedetti
Patient diurnal mood fluctuation, sleep characteristics and factors affecting sleep homeostasis predict antidepressant response to the combination of total sleep deprivation and light therapy (TSD + LT). In order to study if chronotype could influence response to TSD+LT, we considered 194 bipolar depressed patients. Severity of depression was rated with Hamilton Depression Rating Scale; perceived mood levels were assessed by a self-administered 10-cm visual analogue scale and chronotype was assessed using the Mornigness-Eveningness Questionnaire...
May 15, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29750617/no-rest-for-the-women-understanding-the-impact-of-on-call-work-for-women-in-the-emergency-services
#14
Sarah M Jay, Jessica L Paterson, Brad Aisbett, Sally A Ferguson
BACKGROUND: The unpredictable, "on-call" component of the emergency services (ES) may be difficult to navigate in the context of domestic and work responsibilities, and especially difficult for women, given they tend to take on a greater household burden than do men. Our aim was to understand women's experiences in the ES, particularly the impact of being on-call and related coping strategies. METHODS: Twenty-four women were recruited from two ES agencies in Australia...
May 11, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29750588/association-of-urinary-levels-of-6-sulfatoxymelatonin-amt6s-with-prevalent-and-incident-hypertension
#15
Aixa M Pérez-Caraballo, Yunsheng Ma, Judith K Ockene, Katherine W Reeves, Raji Balasubramanian, Frank Z Stanczyk, Matthew A Allison, Chu Chen, Lu Wang, JoAnn E Manson, Susan R Sturgeon
Laboratory studies indicate that melatonin has beneficial vascular effects. However, epidemiologic studies on the relationship between endogenous levels of melatonin and hypertension in humans are limited. We examined the association of quartile levels of 6-sulfatoxymelatonin (aMT6s) in first morning urines with prevalent and incident hypertension in 777 postmenopausal women who were originally part of a case-control study of breast cancer nested in the Women's Health Initiative Observational Study. A total of 321 prevalent and 172 incident cases of hypertension were studied...
May 11, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29750580/how-well-does-a-commercially-available-wearable-device-measure-sleep-in-young-athletes
#16
Charli Sargent, Michele Lastella, Georgia Romyn, Nathan Versey, Dean J Miller, Gregory D Roach
The validity of a commercially available wearable device for measuring total sleep time was examined in a sample of well-trained young athletes during night-time sleep periods and daytime naps. Participants wore a FitBit HR Charge on their non-dominant wrist and had electrodes attached to their face and scalp to enable polysomnographic recordings of sleep in the laboratory. The FitBit automatically detected 24/30 night-time sleep periods but only 6/20 daytime naps. Compared with polysomnography, the FitBit overestimated total sleep time by an average of 52 ± 152 min for night-time sleep periods, and by 4 ± 8 min for daytime naps...
May 11, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29750549/does-breaking-up-prolonged-sitting-when-sleep-restricted-affect-postprandial-glucose-responses-and-subsequent-sleep-architecture-a-pilot-study
#17
Grace E Vincent, Sarah M Jay, Charli Sargent, Katya Kovac, Michele Lastella, Corneel Vandelanotte, Nicola D Ridgers, Sally A Ferguson
This pilot study investigated the impact of breaking up prolonged sitting with light-intensity walking on postprandial glucose responses and sleep architecture. In a randomized, counterbalanced, crossover design, six healthy males completed a sitting condition and an active condition (sitting interrupted with light-intensity walking) for three consecutive days, following 5-h sleep opportunities at night. Postprandial glucose response and sleep (time spent in all stages) was assessed. Breaking up prolonged sitting with light-intensity walking did not affect postprandial glucose responses in sleep-restricted participants; however a small increase (~9 min) in slow-wave sleep was observed...
May 11, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29750548/predictors-of-response-to-combined-wake-and-light-therapy-in-treatment-resistant-inpatients-with-depression
#18
Mette Kragh, Erik Roj Larsen, Klaus Martiny, Dorthe Norden Møller, Camilla Schultz Wihlborg, Tove Lindhardt, Poul Videbech
There is growing evidence for combined chronotherapeutic interventions as adjunctive treatments for major depression. However, as the treatments can be demanding, we need to identify predictors of response. This study aimed to describe predictors of response, remission and deterioration in the short-term phase, as well as predictors of long-term response. The predictors investigated were gender, type of depression, severity of depression, treatment resistance, quetiapine use, general self-efficacy, educational level and positive diurnal variation...
May 11, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29750547/uncertain-call-likelihood-negatively-affects-sleep-and-next-day-cognitive-performance-while-on-call-in-a-laboratory-environment
#19
Madeline Sprajcer, Sarah M Jay, Grace E Vincent, Andrew Vakulin, Leon Lack, Sally A Ferguson
On-call working arrangements are employed in a number of industries to manage unpredictable events, and often involve tasks that are safety- or time-critical. This study investigated the effects of call likelihood during an overnight on-call shift on self-reported pre-bed anxiety, sleep and next-day cognitive performance. A four-night laboratory-based protocol was employed, with an adaptation, a control and two counterbalanced on-call nights. On one on-call night, participants were instructed that they would definitely be called during the night, while on the other on-call night they were told they may be called...
May 11, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29737884/the-impact-of-shift-work-on-eating-patterns-and-self-care-strategies-utilised-by-experienced-and-inexperienced-nurses
#20
Jane Gifkins, Amy Johnston, Rebecca Loudoun
For nurses, shift work is a necessity, required to provide 24-h continuous care for patients. Research posits that fatigue amongst shift-working nurses is associated with inadequate and poorly timed sleep and also strongly influenced by the timing, quality and quantity of food consumed. The aim of this investigation was to examine differences and similarities in the food choices and eating patterns of nurses exposed to different lengths of time in shift work, as a means of understanding how nurses can adapt their eating patterns to better manage fatigue and sleep loss...
May 8, 2018: Chronobiology International
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