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https://www.readbyqxmd.com/read/28934530/intraindividual-increase-of-homeostatic-sleep-pressure-across-acute-and-chronic-sleep-loss-a-high-density-eeg-study
#1
Angelina Maric, Caroline Lustenberger, Esther Werth, Christian R Baumann, Rositsa Poryazova, Reto Huber
Study Objectives: To compare intraindividually the effects of acute sleep deprivation (ASD) and chronic sleep restriction (CSR) on the homeostatic increase in slow wave activity (SWA) and to relate it to impairments in basic cognitive functioning, that is, vigilance. Methods: The increase in SWA after ASD (40 hours of wakefulness) and after CSR (seven nights with time in bed restricted to 5 hours per night) relative to baseline sleep was assessed in nine healthy, male participants (age = 18-26 years) by high-density electroencephalography...
September 1, 2017: Sleep
https://www.readbyqxmd.com/read/28928479/decline-of-long-range-temporal-correlations-in-the-human-brain-during-sustained-wakefulness
#2
Christian Meisel, Kimberlyn Bailey, Peter Achermann, Dietmar Plenz
Sleep is crucial for daytime functioning, cognitive performance and general well-being. These aspects of daily life are known to be impaired after extended wake, yet, the underlying neuronal correlates have been difficult to identify. Accumulating evidence suggests that normal functioning of the brain is characterized by long-range temporal correlations (LRTCs) in cortex, which are supportive for decision-making and working memory tasks. Here we assess LRTCs in resting state human EEG data during a 40-hour sleep deprivation experiment by evaluating the decay in autocorrelation and the scaling exponent of the detrended fluctuation analysis from EEG amplitude fluctuations...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28927417/automatic-sleep-staging-using-ear-eeg
#3
Kaare B Mikkelsen, David Bové Villadsen, Marit Otto, Preben Kidmose
BACKGROUND: Sleep and sleep quality assessment by means of sleep stage analysis is important for both scientific and clinical applications. Unfortunately, the presently preferred method, polysomnography (PSG), requires considerable expert assistance and significantly affects the sleep of the person under observation. A reliable, accurate and mobile alternative to the PSG would make sleep information much more readily available in a wide range of medical circumstances. NEW METHOD: Using an already proven method, ear-EEG, in which electrodes are placed inside the concha and ear canal, we measure cerebral activity and automatically score the sleep into up to five stages...
September 19, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28924202/coupling-and-dynamics-of-cortical-and-autonomic-signals-are-linked-to-central-inhibition-during-the-wake-sleep-transition
#4
Christine Ulke, Jue Huang, Justus T C Schwabedal, Galina Surova, Roland Mergl, Tilman Hensch
Maintaining temporal coordination across physiological systems is crucial at the wake-sleep transition. As shown in recent studies, the degree of coordination between brain and autonomic arousal influences attention, which highlights a previously unrecognised point of potential failure in the attention system. To investigate how cortical and autonomic dynamics are linked to the attentive process we analysed electroencephalogram, electrocardiogram and skin conductance data of 39 healthy adults recorded during a 2-h resting-state oddball experiment...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28922535/power-and-coherence-of-cortical-high-frequency-oscillations-during-wakefulness-and-sleep
#5
Matías Cavelli, Daniel Rojas-Líbano, Natalia Schwarzkopf, Santiago Castro-Zaballa, Joaquín Gonzalez, Alejandra Mondino, Noelia Santana, Luciana Benedetto, Atilio Falconi, Pablo Torterolo
Recently, a novel type of fast cortical oscillatory activity that occurs between 110 and 160 Hz (high-frequency oscillations (HFO)) was described. HFO are modulated by the theta rhythm in hippocampus and neocortex during active wakefulness and REM sleep. Since theta-HFO coupling increases during REM, a role for HFO in memory consolidation has been proposed. However, global properties like the cortex-wide topographic distribution, and the cortico-cortical coherence remain unknown. In the present study, we recorded the electroencephalogram during sleep and wakefulness in the rat, and analyzed the spatial extent of the HFO band power and coherence...
September 18, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28921744/cholinergic-basal-forebrain-structures-are-not-essential-for-mediation-of-the-arousing-action-of-glutamate
#6
Zoltán Lelkes, Shamsiiat Abdurakhmanova, Tarja Porkka-Heiskanen
The cholinergic basal forebrain contributes to cortical activation and receives rich innervations from the ascending activating system. It is involved in the mediation of the arousing actions of noradrenaline and histamine. Glutamatergic stimulation in the basal forebrain results in cortical acetylcholine release and suppression of sleep. However, it is not known to what extent the cholinergic versus non-cholinergic basal forebrain projection neurones contribute to the arousing action of glutamate. To clarify this question, we administered N-methyl-D-aspartate (NMDA), a glutamate agonist, into the basal forebrain in intact rats and after destruction of the cholinergic cells in the basal forebrain with 192 immunoglobulin (Ig)G-saporin...
September 18, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28919257/seizures-by-the-clock-temporal-patterns-of-psychogenic-nonepileptic-seizures
#7
Udaya Seneviratne, Erica Minato, Eldho Paul
We hypothesized that (1) the occurrence of psychogenic nonepileptic seizures (PNES) is modulated by the interaction between the 24-hour clock and the sleep-wake cycle and (2) the pattern of modulation in PNES differs from epileptic seizures (ES). We sought to test our hypotheses in a cohort of patients diagnosed with PNES or ES in the setting of an epilepsy monitoring unit (EMU). We retrospectively reviewed consecutive video-EEG (VEEG) recordings of patients who underwent monitoring at the EMU of a tertiary hospital...
September 11, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28912724/abnormalities-in-the-polysomnographic-adenosine-and-metabolic-response-to-sleep-deprivation-in-an-animal-model-of-hyperammonemia
#8
Selena Marini, Olena Santangeli, Pirjo Saarelainen, Benita Middleton, Namrata Chowdhury, Debra J Skene, Rodolfo Costa, Tarja Porkka-Heiskanen, Sara Montagnese
Patients with liver cirrhosis can develop hyperammonemia and hepatic encephalopathy (HE), accompanied by pronounced daytime sleepiness. Previous studies with healthy volunteers show that experimental increase in blood ammonium levels increases sleepiness and slows the waking electroencephalogram. As ammonium increases adenosine levels in vitro, and adenosine is a known regulator of sleep/wake homeostasis, we hypothesized that the sleepiness-inducing effect of ammonium is mediated by adenosine. Eight adult male Wistar rats were fed with an ammonium-enriched diet for 4 weeks; eight rats on standard diet served as controls...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28894254/theta-waves-in-children-s-waking-electroencephalogram-resemble-local-aspects-of-sleep-during-wakefulness
#9
Sara Fattinger, Salome Kurth, Maya Ringli, Oskar G Jenni, Reto Huber
Vyazovskiy and colleagues found in rats' multi-unit recordings brief periods of silence (off-states) in local populations of cortical neurons during wakefulness which closely resembled the characteristic off-states during sleep. These off-states became more global and frequent with increasing sleep pressure and were associated with the well-known increase of theta activity under sleep deprivation in the surface EEG. Moreover, the occurrence of such off-states was related to impaired performance. While these animal experiments were based on intracranial recordings, we aimed to explore whether the human surface EEG may also provide evidence for such a local sleep-like intrusion during wakefulness...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28873072/amplitude-integrated-eeg-and-brain-sparing-in-preterm-small-for-gestational-age-infants
#10
Isabel Benavente-Fernández, Simón P Lubián-López, Pamela Zafra-Rodríguez, Almudena Alonso-Ojembarrena, Antonio Segado-Arenas, Alfonso M Lechuga-Sancho
PURPOSE: Preterm small-for-gestational-age (SGA) infants are at risk for a high mortality rate and impaired cognitive development. Only a few studies have focused on amplitude-integrated EEG (aEEG) in preterm SGA infants. They have been shown to have a slower rate of brain maturation, but these findings have not consistently been related to neurodevelopmental outcomes. The aim of our study was to evaluate early aEEG monitoring in SGA compared with adequate-for-gestational-age preterms...
September 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28866338/wake-up-to-sleep-the-effects-of-lacosamide-on-daytime-sleepiness-in-adults-with-epilepsy
#11
Nancy Foldvary-Schaefer, Silvia Neme-Mercante, Noah Andrews, Monica Bruton, Lu Wang, Shannon Morrison, James Bena, Madeleine Grigg-Damberger
OBJECTIVE: The objective of the study was to investigate the effects of lacosamide (LCM) on daytime sleepiness ascertained by the Epworth Sleepiness Scale (ESS) in adults with focal epilepsy in a randomized, controlled design. METHODS: Subjects taking ≤2 AEDs for ≥4weeks underwent polysomnography with EEG followed by the maintenance of wakefulness test (MWT) and completed the ESS and other patient-reported outcomes (PROs) at baseline, LCM 200mg/day, and LCM 400mg/day (Visit 4; V4)...
August 31, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28864241/theacrine-a-purine-alkaloid-from-camellia-assamica-var-kucha-with-a-hypnotic-property-via-the-adenosine-system
#12
Haoyi Qiao, Xiansheng Ye, Xiaoyu Bai, Jun He, Tingli Li, Jia Zhang, Weiku Zhang, Jiekun Xu
Theacrine (l,3,7,9-tetramethyluric acid), a purine alkaloid from Camellia assamica var. kucha, has diverse pharmacological properties, including sedative and hypnotic activities, anti-inflammatory and analgesic activities, antidepressant effects, and a protective effect against stress-provoked liver damage. The present study aims to investigate the possible mechanism of the hypnotic activity of theacrine. The results revealed that theacrine significantly enhanced pentobarbital-induced sleep at a dose of 3.0mg/kg (i...
August 31, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28845178/transdermal-nicotine-patch-effects-on-eeg-power-spectra-and-heart-rate-variability-during-sleep-of-healthy-male-adults
#13
Jong-Bae Choi, Yu-Jin G Lee, Do-Un Jeong
OBJECTIVE: The effect of transdermal nicotine patch on sleep physiology is not well established. The current study aimed to examine the influence of nicotine patch on homeostatic sleep propensity and autonomic nervous system. METHODS: We studied 16 non-smoking young healthy volunteers with nocturnal polysomnography in a double blind crossover design between sleep with and without nicotine patch. We compared the sleep variables, sleep EEG power spectra, and heart rate variability...
July 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/28815952/partial-sleep-deprivation-reduces-the-efficacy-of-orexin-a-to-stimulate-physical-activity-and-energy-expenditure
#14
Danielle P DePorter, Jamie E Coborn, Jennifer A Teske
OBJECTIVE: Sufficient sleep is required for weight maintenance. Sleep deprivation due to noise exposure stimulates weight gain by increasing hyperphagia and reducing energy expenditure (EE). Yet the mechanistic basis underlying the weight gain response is unclear. Orexin-A promotes arousal and negative energy balance, and orexin terminals project to the ventrolateral preoptic area (VLPO), which is involved in sleep-to-wake transitions. To determine whether sleep deprivation reduces orexin function in VLPO and to test the hypothesis that sleep deprivation would attenuate the orexin-A-stimulated increase in arousal, physical activity (PA), and EE...
August 17, 2017: Obesity
https://www.readbyqxmd.com/read/28809834/quantifying-infra-slow-dynamics-of-spectral-power-and-heart-rate-in-sleeping-mice
#15
Laura M J Fernandez, Sandro Lecci, Romain Cardis, Gil Vantomme, Elidie Béard, Anita Lüthi
Three vigilance states dominate mammalian life: wakefulness, non-rapid eye movement (non-REM) sleep, and REM sleep. As more neural correlates of behavior are identified in freely moving animals, this three-fold subdivision becomes too simplistic. During wakefulness, ensembles of global and local cortical activities, together with peripheral parameters such as pupillary diameter and sympathovagal balance, define various degrees of arousal. It remains unclear the extent to which sleep also forms a continuum of brain states-within which the degree of resilience to sensory stimuli and arousability, and perhaps other sleep functions, vary gradually-and how peripheral physiological states co-vary...
August 2, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28794189/time-of-day-influences-on-respiratory-sequelae-following-maximal-electroshock-induced-seizures-in-mice
#16
Benton S Purnell, Michael A Hajek, Gordon F Buchanan
Sudden unexpected death in epilepsy (SUDEP) is the leading cause of death in refractory epilepsy patients. While specific mechanisms underlying SUDEP are not well understood, evidence suggests most SUDEP occurs due to seizure-induced respiratory arrest. SUDEP also tends to happen at night. While this may be due to circumstances humans find themselves in at night, such as being alone without supervision or sleeping prone, or due to independent influences of sleep state, there are a number of reasons why the night (i...
August 9, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28777180/sleep-wake-disorders-of-childhood
#17
Suresh Kotagal
PURPOSE OF REVIEW: Sleep-wake disorders occur in 10% to 28% of children and differ somewhat in pathophysiology and management from sleep-wake disorders in adults. This article discusses the diagnosis and management of key childhood sleep disorders. RECENT FINDINGS: The role of sleep in memory consolidation and in the facilitation of learning has been increasingly recognized, even at the toddler stage. Cataplexy, a key feature of narcolepsy type 1, may be subtle in childhood and characterized by transient muscle weakness isolated to the face...
August 2017: Continuum: Lifelong Learning in Neurology
https://www.readbyqxmd.com/read/28776683/hypercapnia-induced-active-expiration-increases-in-sleep-and-enhances-ventilation-in-unanaesthetized-rats
#18
Isabela P Leirão, Carlos A Silva, Luciane H Gargaglioni, Glauber S F da Silva
Expiration is passive at rest but becomes active through recruitment of abdominal muscles under increased respiratory drive. Hypercapnia-induced active expiration has not been well explored in unanaesthetized rats. We hypothesized that (i) CO2 -evoked active expiration is recruited in a state-dependent manner i.e. differently in sleep or wakefulness and (ii) that recruitment of active expiration enhances ventilation, hence having an important functional role in meeting metabolic demand. To test these hypotheses Wistar rats (280-330 g) were implanted with electrodes for electroencephalography (EEG) and electromyography (EMG) of the neck, diaphragm (DIA) and abdominal (ABD) muscles...
August 3, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28757050/electroencephalographic-cognitive-and-neurochemical-effects-of-ly3130481-cerc-611-a-selective-antagonist-of-tarp-%C3%AE-8-associated-ampa-receptors
#19
Jeffrey M Witkin, Jennifer Li, Gary Gilmour, Stephen N Mitchell, Guy Carter, Scott D Gleason, Wesley F Seidel, Brian J Eastwood, Andrew McCarthy, Warren J Porter, Jon Reel, Kevin M Gardinier, Akihiko S Kato, Keith A Wafford
6-[(1S)-1-[1-[5-(2-hydroxyethoxy)-2-pyridyl]pyrazol-3-yl]ethyl]-3H-1,3-benzothiazol-2-one (LY3130481 or CERC-611) is a selective antagonist of AMPA receptors containing transmembrane AMPA receptor regulatory protein (TARP) γ-8. This molecule has been characterized as a potent and efficacious anticonvulsant in an array of acute and chronic epilepsy models in rodents. The present set of experiments was designed to assess the effects of LY3130481 on the electroencephelogram (EEG), cognitive function, and neurochemical outflow...
July 27, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28754605/train-hard-sleep-well-perceived-training-load-sleep-quantity-and-sleep-stage-distribution-in-elite-level-athletes
#20
Melanie Knufinke, Arne Nieuwenhuys, Sabine A E Geurts, Els I S Møst, Kamiel Maase, Maarten H Moen, Anton M L Coenen, Michiel A J Kompier
OBJECTIVES: Sleep is essential for recovery and performance in elite athletes. While it is generally assumed that exercise benefits sleep, high training load may jeopardize sleep and hence limit adequate recovery. To examine this, the current study assessed objective sleep quantity and sleep stage distributions in elite athletes and calculated their association with perceived training load. DESIGN: Mixed-methods. METHODS: Perceived training load, actigraphy and one-channel EEG recordings were collected among 98 elite athletes during 7 consecutive days of regular training...
July 12, 2017: Journal of Science and Medicine in Sport
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