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https://www.readbyqxmd.com/read/27912863/circadian-rhythm-and-sleep-during-prolonged-antarctic-residence-at-chinese-zhongshan-station
#1
Nan Chen, Quan Wu, Yanlei Xiong, Guang Chen, Dandan Song, Chengli Xu
OBJECTIVE: Residence at Zhongshan Station (69°22'24″S, 76°22'40″E) for over 1 year exposes winter-over members to marked changes of light-dark cycle, ranging from the constant daylight of polar days to the constant darkness of polar nights, in addition to geographic and social isolation. This extreme photoperiodic environment may increase the risk of sleep disturbances and circadian desynchrony. The aim of this study was to investigate the circadian rhythm and sleep phase of Chinese winter-over expeditioners at Zhongshan Station...
December 2016: Wilderness & Environmental Medicine
https://www.readbyqxmd.com/read/27908540/the-role-of-race-and-ethnicity-in-sleep-circadian-rhythms-and-cardiovascular-health
#2
REVIEW
Kieren J Egan, Kristen L Knutson, Alexandre C Pereira, Malcolm von Schantz
In recent years, strong evidence has emerged suggesting that insufficient duration, quality, and/or timing of sleep are associated with cardiovascular disease (CVD), and various mechanisms for this association have been proposed. Such associations may be related to endophenotypic features of the sleep homeostat and the circadian oscillator, or may be state-like effects of the environment. Here, we review recent literature on sleep, circadian rhythms and CVD with a specific emphasis on differences between racial/ethnic groups...
June 3, 2016: Sleep Medicine Reviews
https://www.readbyqxmd.com/read/27906111/the-functional-significance-of-the-skeletal-muscle-clock-lessons-from-bmal1-knockout-models
#3
REVIEW
Stefano Schiaffino, Bert Blaauw, Kenneth A Dyar
The circadian oscillations of muscle genes are controlled either directly by the intrinsic muscle clock or by extrinsic factors, such as feeding, hormonal signals, or neural influences, which are in turn regulated by the central pacemaker, the suprachiasmatic nucleus of the hypothalamus. A unique feature of circadian rhythms in skeletal muscle is motor neuron-dependent contractile activity, which can affect the oscillation of a number of muscle genes independently of the muscle clock. The role of the intrinsic muscle clock has been investigated using different Bmal1 knockout (KO) models...
October 13, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27904104/the-effects-of-unilateral-nephrectomy-on-blood-pressure-and-its-circadian-rhythm
#4
Naro Ohashi, Shinsuke Isobe, Sayaka Ishigaki, Takahisa Suzuki, Daisuke Motoyama, Takayuki Sugiyama, Masao Nagata, Akihiko Kato, Seiichiro Ozono, Hideo Yasuda
Objective Hypertension and diurnal blood pressure (BP) variation are widely accepted as risk factors for renal damage. However, the effects of unilateral nephrectomy on BP and its circadian rhythm have not yet been clarified in patients with a compromised renal function, including dialysis patients. Methods We investigated 22 unilateral nephrectomized patients (16 men and 6 women, age: 64.5±14.3 years). The function of the circulating renin-angiotensin system (RAS) (plasma renin activity and plasma angiotensin II) and 24-h ambulatory BP monitoring (ABPM) were evaluated before and after nephrectomy...
2016: Internal Medicine
https://www.readbyqxmd.com/read/27895820/sleep-circadian-dysrhythmia-obesity-and-diabetes
#5
REVIEW
Gumpeny Ramachandra Sridhar, Narasimhadevara Santhi Nirmala Sanjana
Synchrony of biological processes with environmental cues developed over millennia to match growth, reproduction and senescence. This entails a complex interplay of genetic, metabolic, chemical, light, hormonal and hedonistic factors across life forms. Sleep is one of the most prominent rhythms where such a match is established. Over the past 100 years or so, it has been possible to disturb the synchrony between sleep-wake cycle and environmental cues. Development of electric lights, shift work and continual accessibility of the internet has disrupted this match...
November 15, 2016: World Journal of Diabetes
https://www.readbyqxmd.com/read/27895577/fus1-ko-mouse-as-a-model-of-oxidative-stress-mediated-sporadic-alzheimer-s-disease-circadian-disruption-and-long-term-spatial-and-olfactory-memory-impairments
#6
Guillermo Coronas-Samano, Keeley L Baker, Winston J T Tan, Alla V Ivanova, Justus V Verhagen
Insufficient advances in the development of effective therapeutic treatments of sporadic Alzheimer's Disease (sAD) to date are largely due to the lack of sAD-relevant animal models. While the vast majority of models do recapitulate AD's hallmarks of plaques and tangles by virtue of tau and/or beta amyloid overexpression, these models do not reflect the fact that in sAD (unlike familial AD) these genes are not risk factors per se and that other mechanisms like oxidative stress, metabolic dysregulation and inflammation play key roles in AD etiology...
2016: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/27887821/-sleep-disorders-in-internet-addiction
#7
Aymeric Petit, Laurent Karila, Candice Estellat, Delphine Moisan, Michel Reynaud, Marie-Pia D'Ortho, Michel Lejoyeux, Fanny Levy
BACKGROUND: The relationship between sleep disorders and Internet addiction has been little work. Given the importance of these disorders, we felt it appropriate to make a synthesis of available data and to establish causality or accountability between Internet addiction and the onset of sleep disorders. METHODS: A literature review was then performed. We selected scientific articles in English and French, published between 1987 and 2016 by consulting the databases Medline, Embase, PsycINFO and Google Scholar...
November 22, 2016: La Presse Médicale
https://www.readbyqxmd.com/read/27885006/mechanisms-linking-circadian-clocks-sleep-and-neurodegeneration
#8
REVIEW
Erik S Musiek, David M Holtzman
Disruptions of normal circadian rhythms and sleep cycles are consequences of aging and can profoundly affect health. Accumulating evidence indicates that circadian and sleep disturbances, which have long been considered symptoms of many neurodegenerative conditions, may actually drive pathogenesis early in the course of these diseases. In this Review, we explore potential cellular and molecular mechanisms linking circadian dysfunction and sleep loss to neurodegenerative diseases, with a focus on Alzheimer's disease...
November 25, 2016: Science
https://www.readbyqxmd.com/read/27884756/repeated-unpredictable-threats-without-harm-impair-spatial-working-memory-in-the-barnes-maze
#9
Diane J Kim, Nathan St Louis, Ralph A Molaro, Glenn T Hudson, Robert C Chorley, Brenda J Anderson
Psychological stressors elicit the anticipation of homeostatic challenge, whereas physical stressors are direct threats to homeostasis. Many rodent models of stress include both types of stressors, yet deficits, like those reported for working memory, are often attributed to psychological stress. To empirically test whether intermittent psychological stressors, such as repeated threats, are solely sufficient to impair spatial working memory, we developed a novel rodent model of stress that is restricted to the anticipation of threat, and free of direct physical challenge...
November 21, 2016: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/27884699/cell-adhesion-molecules-and-sleep
#10
REVIEW
Emma Kate O'Callaghan, Maria Neus Ballester Roig, Valérie Mongrain
Cell adhesion molecules (CAM) play essential roles in the central nervous system, where some families are involved in synaptic development and function. These synaptic adhesion molecules (SAMs) are involved in the regulation of synaptic plasticity, and the formation of neuronal networks. Recent findings from studies examining the consequences of sleep loss suggest that these molecules are candidates to act in sleep regulation. This review highlights the experimental data that lead to the identification of SAMs as potential sleep regulators, and discusses results supporting that specific SAMs are involved in different aspects of sleep regulation...
November 21, 2016: Neuroscience Research
https://www.readbyqxmd.com/read/27882399/-circadian-rhythm-influence-on-epworth-sleepiness-scale-score
#11
M Herzog, A Bedorf, C Rohrmeier, T Kühnel, B Herzog, T Bremert, S Plontke, S Plößl
BACKGROUND: The Epworth Sleepiness Scale (ESS) is frequently used to determine daytime sleepiness in patients with sleep-disordered breathing. It is still unclear whether different levels of alertness induced by the circadian rhythm influence ESS score. OBJECTIVE: The aim of this study is to investigate the influence of circadian rhythm-dependent alertness on ESS performance. MATERIALS AND METHODS: In a monocentric prospective noninterventional observation study, 97 patients with suspected sleep-disordered breathing were investigated with respect to daytime sleepiness in temporal relationship to polysomnographic examination and treatment...
November 23, 2016: HNO
https://www.readbyqxmd.com/read/27875989/interleukin-1-receptor-il-1r-mediates-epilepsy-induced-sleep-disruption
#12
Tzu-Rung Huang, Shuo-Bin Jou, Yu-Ju Chou, Pei-Lu Yi, Chun-Jen Chen, Fang-Chia Chang
BACKGROUND: Sleep disruptions are common in epilepsy patients. Our previous study demonstrates that homeostatic factors and circadian rhythm may mediate epilepsy-induced sleep disturbances when epilepsy occurs at different zeitgeber hours. The proinflammatory cytokine, interleukin-1 (IL-1), is a somnogenic cytokine and may also be involved in epileptogenesis; however, few studies emphasize the effect of IL-1 in epilepsy-induced sleep disruption. We herein hypothesized that IL-1 receptor type 1 (IL-1R1) mediates the pathogenesis of epilepsy and epilepsy-induced sleep disturbances...
November 22, 2016: BMC Neuroscience
https://www.readbyqxmd.com/read/27868947/diet-and-nutrients-in-the-modulation-of-infant-sleep-a-review-of-the-literature
#13
Nora Schneider, Gisella Mutungi, Javier Cubero
OBJECTIVES: The establishment of organized sleep patterns is an important developmental process during infancy. Little is known about the role of nutrition in sleep maturation. This review focuses on exploring the link between infant sleep and nutrition with the aim to provide an overview of existing literature on the impact of diet and specific nutrients on sleep modulation in infants. METHODS: An exploratory literature search was performed on the topic in Medline, Scopus and Cochrane Library databases, with a focus on publications in English...
November 21, 2016: Nutritional Neuroscience
https://www.readbyqxmd.com/read/27868260/an-experimental-study-of-adolescent-sleep-restriction-during-a-simulated-school-week-changes-in-phase-sleep-staging-performance-and-sleepiness
#14
Alex Agostini, Mary A Carskadon, Jillian Dorrian, Scott Coussens, Michelle A Short
This laboratory study investigated the impact of restricted sleep during a simulated school week on circadian phase, sleep stages and daytime functioning. Changes were examined across and within days and during a simulated weekend recovery. Participants were 12 healthy secondary school students (six male) aged 15-17 years [mean = 16.1 years, standard deviation (SD) = 0.9]. After 2 nights with 10 h (21:30-07:30 hours), time in bed was restricted to 5 h for 5 nights (02:30-07:30 hours), then returned to 10 h time in bed for 2 nights (21:30-07:30 hours)...
November 21, 2016: Journal of Sleep Research
https://www.readbyqxmd.com/read/27868193/no-pattern-alteration-in-single-nocturnal-melatonin-secretion-in-patients-with-hypnic-headache-a-case-control-study
#15
Steffen Naegel, Jana-Isabel Huhn, Charly Gaul, Hans-Christoph Diener, Mark Obermann, Dagny Holle
OBJECTIVE: To investigate headache-related serum melatonin levels and melatonin excretion rhythmicity in patients with hypnic headache (HH). BACKGROUND: Strict sleep dependency of headache attacks is a pathognomonic feature of HH. Changes in melatonin levels, a marker for circadian rhythm, are assumed to play a pivotal role in the pathophysiology of HH. METHODS: Serum melatonin levels were acquired in nine patients with HH and nine age- and gender-matched healthy controls over a 20-hour time period (12 pm, 4 pm, 7 pm, 10 pm, time of headache, and 8 am)...
November 21, 2016: Headache
https://www.readbyqxmd.com/read/27863901/a-systematic-review-of-the-literature-on-disorders-of-sleep-and-wakefulness-in-parkinson-s-disease-from-2005-to-2015
#16
REVIEW
Lama M Chahine, Amy W Amara, Aleksandar Videnovic
Sleep disorders are among the most common non-motor manifestations in Parkinson's disease (PD) and have a significant negative impact on quality of life. While sleep disorders in PD share most characteristics with those that occur in the general population, there are several considerations specific to this patient population regarding diagnosis, management, and implications. The available research on these disorders is expanding rapidly, but many questions remain unanswered. We thus conducted a systematic review of the literature published from 2005 to 2015 on the following disorders of sleep and wakefulness in PD: REM sleep behavior disorder, insomnia, nocturia, restless legs syndrome and periodic limb movements, sleep disordered breathing, excessive daytime sleepiness, and circadian rhythm disorders...
August 31, 2016: Sleep Medicine Reviews
https://www.readbyqxmd.com/read/27862514/patient-room-lighting-influences-on-sleep-appraisal-and-mood-in-hospitalized-people
#17
Marina C Giménez, Leonie M Geerdinck, Mathijs Versteylen, Pieter Leffers, Gaby J B M Meekes, Hannelore Herremans, Boris de Ruyter, Jan Willem Bikker, Petra M J C Kuijpers, Luc J M Schlangen
Irregular 24 h light/dark cycles with night-time light exposure and a low amplitude are disruptive for sleep, mood and circadian rhythms. Nevertheless such lighting conditions are quite common in medical care facilities. A controlled clinical trial among 196 cardiology ward patients (mean age 66.5 ± 13.1 years SD) investigated how a patient room lighting intervention affects sleep, appraisal and mood across hospitalization. Patients were either assigned to a standardly-lit room or to a room with an interventional lighting system offering a dynamic 24 h light/dark cycle with low nocturnal light exposure and 2 h of bright light (1750 lux) during daytime...
November 10, 2016: Journal of Sleep Research
https://www.readbyqxmd.com/read/27858974/report-and-research-agenda-of-the-american-geriatrics-society-and-national-institute-on-aging-bedside-to-bench-conference-on-sleep-circadian-rhythms-and-aging-new-avenues-for-improving-brain-health-physical-health-and-functioning
#18
Constance H Fung, Michael V Vitiello, Cathy A Alessi, George A Kuchel
The American Geriatrics Society, with support from the National Institute on Aging and other funders, held its eighth Bedside-to-Bench research conference, entitled "Sleep, Circadian Rhythms, and Aging: New Avenues for Improving Brain Health, Physical Health and Functioning," October 4 to 6, 2015, in Bethesda, Maryland. Part of a conference series addressing three common geriatric syndromes-delirium, sleep and circadian rhythm (SCR) disturbance, and voiding dysfunction-the series highlighted relationships and pertinent clinical and pathophysiological commonalities between these three geriatric syndromes...
November 14, 2016: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/27858294/sleep-quality-morningness-eveningness-preference-mood-profile-and-levels-of-serum-melatonin-in-migraine-patients-a-case-control-study
#19
Hasan Hüseyin Kozak, Murat Boysan, Ali Ulvi Uca, Adem Aydın, İbrahim Kılınç, Emine Genç, Mustafa Altaş, Dilara Cari Güngör, Keziban Turgut, Nejla Özer
The melatonin as the pineal gland's secretory product is implicated in the pathophysiology of migraine. Melatonin has critical functions in human physiology, and research underscores the importance of melatonin in circadian rhythm, sleep, and mood regulation. Clinical observations have indicated that migraine attacks have a seasonal, menstrual, and circadian timing, suggesting that chronobiological mechanisms and their alterations may causally involve in the etiology of the disease. However, the topic has received relatively little attention in the migraine literature...
November 17, 2016: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/27857964/women-with-postpartum-weight-retention-have-delayed-wake-times-and-decreased-sleep-efficiency-during-the-perinatal-period-a-brief-report
#20
K M Sharkey, G M Boni, J A Quattrucci, S Blatch, S N Carr
OBJECTIVE: This study assessed sleep and circadian rhythms across the perinatal period in new mothers with and without postpartum weight retention (PPWR). METHODS: Weight was measured at 2 and 16 weeks postpartum in 21 women with previous major depression or bipolar disorder (mean age 29.5±4.7 years) who self-reported pre-pregnancy weight during third trimester. Wrist actigraphy was acquired at 33 weeks gestation and postpartum weeks 2, 6, and 16. Circadian phase was measured at 33 weeks gestation and 6 weeks postpartum...
September 2016: Sleep Health
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