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https://www.readbyqxmd.com/read/28329381/the-effects-of-an-afternoon-nap-on-episodic-memory-in-young-and-older-adults-napping-and-aging
#1
Michael K Scullin, Jacqueline Fairley, Michael J Decker, Donald L Bliwise
Study Objectives: In young adults, napping is hypothesized to benefit episodic memory retention (e.g., via consolidation). Whether this relationship is present in older adults has not been adequately tested, but is an important question because older adults display marked changes in sleep and memory. Design: Between-subjects design. Setting: Sleep laboratory at Emory University School of Medicine. Participants: 50 healthy young adults (18-29) and 45 community dwelling older adults (58-83)...
March 1, 2017: Sleep
https://www.readbyqxmd.com/read/28329084/obstructive-sleep-apnea-is-associated-with-early-but-possibly-modifiable-alzheimer-s-disease-changes
#2
Claudio Liguori, Nicola Biagio Mercuri, Francesca Izzi, Andrea Romigi, Alberto Cordella, Giuseppe Sancesario, Fabio Placidi
Study Objectives: Obstructive sleep apnea (OSA) is a common sleep disorder. Actually, literature lacks studies examining sleep, cognition, and Alzheimer's Disease (AD) cerebrospinal-fluid biomarkers in OSA patients. Therefore, we firstly studied cognitive performances, polysomnographic sleep, and CSF β-amyloid, tau proteins and lactate levels in patients affected by subjective cognitive impairment (SCI) divided in three groups: OSA patients (showing an Apnea-Hypopnea Index - AHI ≥15/h), controls (showing an AHI<15/h), and patients treating OSA by continuous positive airway pressure (CPAP)...
January 28, 2017: Sleep
https://www.readbyqxmd.com/read/28320844/the-effects-of-obstructive-sleep-apnea-syndrome-on-the-dentate-gyrus-and-learning-and-memory-in-children
#3
Jiook Cha, Johanna A Zea-Hernandez, Sanghun Sin, Katharina Graw-Panzer, Keivan Shifteh, Carmen R Isasi, Mark E Wagshul, Eileen E Moran, Jonathan Posner, Molly E Zimmerman, Raanan Arens
Obstructive sleep apnea syndrome (OSAS) is associated with intermittent hypoxia and sleep loss. In children, impairments of cognitive function are important manifestations, but underlying pathology is unknown. We hypothesized that OSAS would affect the dentate gyrus, a hippocampal subdivision essential to neurogenesis and cognition, and that this impact would further affect cognitive function in children. In children with OSAS (n=11) and control subjects (n=12; age and sex-matched), we performed diffusion tensor imaging and structural MRI, polysomnography, and neuropsychological assessments...
March 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28315340/in-vivo-pharmacological-profile-of-s-38093-a-novel-histamine-h3-receptor-inverse-agonist
#4
Fany Panayi, Aurore Sors, Lionel Bert, Brigitte Martin, Gaelle Rollin-Jego, Rodolphe Billiras, Isabelle Carrié, Karine Albinet, Laurence Danober, Nathalie Rogez, Jean-Yves Thomas, Luigi Pira, Valérie Bertaina-Anglade, Pierre Lestage
S 38093, a novel histamine H3 receptor inverse agonist, was tested in a series of neurochemical and behavioral paradigms designed to evaluate its procognitive and arousal properties. In intracerebral microdialysis studies performed in rats, S 38093 dose-dependently increased histamine extracellular levels in the prefrontal cortex and facilitated cholinergic transmission in the prefrontal cortex and hippocampus of rats after acute and chronic administration (10mg/kg i.p.). Acute oral administration of S 38093 at 0...
March 14, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28315177/physical-symptoms-screening-for-cardiopulmonary-complications-of-obesity-using-audio-computer-assisted-self-interviews
#5
Jorge L Morales-Estrella, Farah D Ciftci, William E Trick, Keiki Hinami
PURPOSE: The main study objective was to assess the predictive value of selected physical symptoms for screening obstructive sleep apnea and major cardiac conditions in adults with obesity, thus providing the evidence for routine symptom screening of obesity complications endorsed by obesity management clinical practice guidelines. METHODS: We performed a retrospective cohort study using patient-reported outcomes data including the physical symptoms severity component of the Memorial Symptom Assessment Scale administered through Audio Computer-Assisted Self-Interviews combined with data from the electronic medical records of an urban safety-net primary care clinic...
March 17, 2017: Quality of Life Research
https://www.readbyqxmd.com/read/28306607/orexin-a-aggravates-the-impairment-of-hippocampal-neurons-caused-by-intermittent-hypoxemia-by-the-oxr-plc%C3%AE-1-erk1-2-pathway
#6
Guohua Li, Shi Tang, Heng Chi, Weiwei Huang, Shanshan Lu, Xin Lv, Xiaomin Liu, Yan Li, Yanpeng Wang, Jiyou Tang
Obstructive sleep apnea is a highly prevalent but under-recognized disorder that causes neurocognitive deficits such as spatial memory and learning deficits. These deficits are frequently accompanied by an increase in orexin-A, which has been shown to be involved in learning and memory as well as in neuronal apoptosis in brain areas involved in cognition, such as the hippocampus. The aim of this work was to study the possible harmful effects of orexin-A on intermittent hypoxemia-induced hippocampal neuronal damage and to investigate the potential underlying molecular mechanisms and signaling pathways in vitro...
March 16, 2017: Neuroreport
https://www.readbyqxmd.com/read/28302573/stair-walking-is-more-energizing-than-low-dose-caffeine-in-sleep-deprived-young-women
#7
Derek D Randolph, Patrick J O'Connor
INTRODUCTION: The acute energizing effect of exercise and caffeine has never been examined in a single study of adults with chronic sleep deprivation but evidence from a study of this type could help individuals choose between these two common alertness-enhancing options. AIM: The apriori primary aim of this experiment was to compare the influence of 10-min of low-to-moderate intensity stair walking to the consumption of capsules containing 50mg caffeine or flour (placebo) on feelings of energy in physically active, college female caffeine users with chronic insufficient sleep...
March 14, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28302453/brain-rhythm-attractor-breakdown-in-alzheimer-s-disease-functional-and-pathologic-implications
#8
Elissaios Karageorgiou, Keith A Vossel
This perspective binds emerging evidence on the bidirectional relationship between Alzheimer's disease (AD) and sleep disorders through a model of brain rhythm attractor breakdown. This approach explains behavioral-cognitive changes in AD across the sleep-wake cycle and supports a causal association between early brainstem tau pathology and subsequent cortical amyloid-β accumulation. Specifically, early tau dysregulation within brainstem-hypothalamic nuclei leads to breakdown of sleep-wake attractor networks, with patients displaying an attenuated range of behavioral and electrophysiological activity patterns, a "twilight zone" of constant activity between deep rest and full alertness...
March 13, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28301977/cognitive-complaints-in-women-with-fibromyalgia-are-they-due-to-depression-or-to-objective-cognitive-dysfunction
#9
Olga Gelonch, Maite Garolera, Joan Valls, Lluís Rosselló, Josep Pifarré
INTRODUCTION: Cognitive complaints are common in fibromyalgia, but it is unclear whether they represent an objective cognitive dysfunction or whether they could be explained by depressive symptoms. Here, we aim to elucidate the frequency of subjective cognitive complaints in a sample of women with fibromyalgia, in addition to analyzing associations between these subjective complaints and objective measures linked to the attention and executive cognitive domains. Finally, we aim to investigate the ability of demographic, clinical, and psychological variables to explain the subjective complaints observed...
March 17, 2017: Journal of Clinical and Experimental Neuropsychology
https://www.readbyqxmd.com/read/28301203/time-for-considering-the-possibility-that-sleep-plays-no-unique-role-in-motor-memory-consolidation-reply-to-adi-japha-and-karni-2016
#10
Timothy C Rickard, Steven C Pan
The hypothesis that sleep makes a unique contribution to motor memory consolidation has been debated in recent years. In the target article (Pan & Rickard, 2015), we reported results of a comprehensive meta-analysis of the explicit motor sequence learning literature in which evidence was evaluated for both enhanced performance after sleep and stabilization after sleep. After accounting for confounding variables, we found no compelling evidence for either empirical phenomenon, and hence no compelling evidence for sleep-specific consolidation...
April 2017: Psychological Bulletin
https://www.readbyqxmd.com/read/28300484/factors-associated-with-general-and-health-related-quality-of-life-in-menopausal-transition-among-women-from-serbia
#11
Jelena Dotlic, Ilma Kurtagic, Selmina Nurkovic, Nikolina Kovacevic, Sanja Radovanovic, Biljana Rancic, Branislav Milosevic, Milan Terzic, Tatjana Gazibara
This study assessed factors associated with quality of life (QOL) among Serbian peri- and postmenopausal women using two menopause-specific scales. This cross-sectional study included 500 women aged 40-65 years who had a gynecologic check-up in one of two Community Health Centers in Belgrade during February 2014 to January 2015. Women completed: a questionnaire about socio-demographics, habits and health status; a menopause-specific questionnaire, Utian's Quality of Life Scale (UQOL); a Women's Health Questionnaire (WHQ) and Beck's Depression Inventory (BDI)...
March 16, 2017: Women & Health
https://www.readbyqxmd.com/read/28300056/imbalance-between-tnf%C3%AE-and-progranulin-contributes-to-memory-impairment-and-anxiety-in-sleep-deprived-mice
#12
Kun Zhang, Yu-Jiao Li, Dan Feng, Peng Zhang, Ya-Tao Wang, Xiang Li, Shui-Bing Liu, Yu-Mei Wu, Ming-Gao Zhao
Sleep disorder is becoming a widespread problem in current society, and is associated with impaired cognition and emotional disorders. Progranulin (PGRN), also known as granulin epithelin precursor, promotes neurite outgrowth and cell survival, and is encoded by the GRN gene. It is a tumor necrosis factor α receptor (TNFR) ligand which is implicated in many central nervous system diseases. However, the role PGRN in sleep disorder remains unclear. In the present study, we found that sleep deprivation (S-DEP) impaired the memory and produced thigmotaxis/anxiety-like behaviors in mice...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28294068/cognitive-impacts-of-estrogen-treatment-in-androgen-deprived-males-what-needs-to-be-resolved
#13
Erik Wibowo
BACKGROUND: Many prostate cancer (PCa) patients are on androgen deprivation therapy (ADT) as part of their cancer treatments but ADT may cause cognitive impairments. ADT depletes men of both androgen and estrogen. Whether estradiol supplementation can improve cognitive impairments in patients on ADT is understudied. OBJECTIVE: To summarize data on the effects of estradiol treatment on cognitive function of androgen-deprived genetic male populations (PCa patients and male-to-female transsexuals) and castrated male animals...
March 13, 2017: Current Neuropharmacology
https://www.readbyqxmd.com/read/28291701/obstructive-sleep-apnea-exaggerates-cognitive-dysfunction-in-stroke-patients
#14
Yan Zhang, Wanhua Wang, Sijie Cai, Qi Sheng, Shenggui Pan, Fang Shen, Qing Tang, Yang Liu
BACKGROUND: Obstructive sleep apnea (OSA) is very common in stroke survivors. It potentially worsens the cognitive dysfunction and inhibits their functional recovery. However, whether OSA independently damages the cognitive function in stroke patients is unclear. A simple method for evaluating OSA-induced cognitive impairment is also missing. METHODS: Forty-four stroke patients six weeks after onset and 24 non-stroke patients with snoring were recruited for the polysomnographic study of OSA and sleep architecture...
February 4, 2017: Sleep Medicine
https://www.readbyqxmd.com/read/28289399/auditory-and-vestibular-evoked-potentials-correlate-with-motor-and-non-motor-features-of-parkinson-s-disease
#15
Ali Soliman Shalash, Dalia Mohamed Hassan, Hanan Hani Elrassas, Mohamed Mosaad Salama, Edna Méndez-Hernández, José M Salas-Pacheco, Oscar Arias-Carrión
Degeneration of several brainstem nuclei has been long related to motor and non-motor symptoms (NMSs) of Parkinson's disease (PD). Nevertheless, due to technical issues, there are only a few studies that correlate that association. Brainstem auditory-evoked potential (BAEP) and vestibular-evoked myogenic potential (VEMP) responses represent a valuable tool for brainstem assessment. Here, we investigated the abnormalities of BAEPs, ocular VEMPs (oVEMPs), and cervical VEMPs (cVEMPs) in patients with PD and its correlation to the motor and NMSs...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28288833/the-impact-of-sleep-on-novel-concept-learning
#16
Yvette M Graveline, Erin J Wamsley
Prior research demonstrates that sleep benefits memory consolidation. But beyond its role in memory retention, sleep may also facilitate the reorganization and flexible use of new information. In the present study, we investigated the effect of sleep on conceptual knowledge. Participants classified abstract dot patterns into novel categories, and were later tested on both previously seen dot patterns as well as on new patterns. A Wake group (n = 17) trained at 9 AM, continued with their daily activities, and then tested at 9 PM that evening...
March 10, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28288397/neural-mechanisms-of-vocal-imitation-the-role-of-sleep-replay-in-shaping-mirror-neurons
#17
REVIEW
Nicolas Giret, Jean-Marc Edeline, Catherine Del Negro
Learning by imitation involves not only perceiving another individual's action to copy it, but also the formation of a memory trace in order to gradually establish a correspondence between the sensory and motor codes, which represent this action through sensorimotor experience. Memory and sensorimotor processes are closely intertwined. Mirror neurons, which fire both when the same action is performed or perceived, have received considerable attention in the context of imitation. An influential view of memory processes considers that the consolidation of newly acquired information or skills involves an active offline reprocessing of memories during sleep within the neuronal networks that were initially used for encoding...
March 10, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28288386/sleep-regulation-of-the-distribution-of-cortical-firing-rates
#18
REVIEW
Daniel Levenstein, Brendon O Watson, John Rinzel, György Buzsáki
Sleep is thought to mediate both mnemonic and homeostatic functions. However, the mechanism by which this brain state can simultaneously implement the 'selective' plasticity needed to consolidate novel memory traces and the 'general' plasticity necessary to maintain a well-functioning neuronal system is unclear. Recent findings show that both of these functions differentially affect neurons based on their intrinsic firing rate, a ubiquitous neuronal heterogeneity. Furthermore, they are both implemented by the NREM slow oscillation, which also distinguishes neurons based on firing rate during sequential activity at the DOWN→UP transition...
March 10, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28280616/differences-in-symptom-occurrence-severity-and-distress-ratings-between-patients-with-gastrointestinal-cancers-who-received-chemotherapy-alone-or-chemotherapy-with-targeted-therapy
#19
Ilufredo Y Tantoy, Anand Dhruva, Janine Cataldo, Alan Venook, Bruce A Cooper, Steven M Paul, Jon D Levine, Yvette P Conley, Frances Cartwright, Kathryn Lee, Fay Wright, Christine Miaskowski
BACKGROUND: Approximately 28% of patients with gastrointestinal (GI) cancers will receive targeted therapy (TT) because of the associated increases in survival. Only four studies have examined the symptom experience of these patients. To date, no studies have evaluated for differences in symptom occurrence, severity, and distress between patients who received chemotherapy (CTX) alone (n=304) or CTX with TT (n=93). METHODS: Patients completed self-report questionnaires, approximately one week after they received CTX...
February 2017: Journal of Gastrointestinal Oncology
https://www.readbyqxmd.com/read/28278432/sculpting-memory-during-sleep-concurrent-consolidation-and-forgetting
#20
REVIEW
Gordon B Feld, Jan Born
There is compelling evidence that sleep actively supports the formation of long-lasting memory representations. Experimental cuing of memories proved that neural replay of representations during sleep plays a causal role for this consolidation, which has also been shown to promote neocortical synaptic plasticity and spine formation. Concurrently, sleep has been proposed to facilitate forgetting through processes of synaptic renormalisation. This view received indirect support by findings in humans of sleep enhancing TMS-evoked plasticity and capabilities for encoding new information...
March 6, 2017: Current Opinion in Neurobiology
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