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1.
Nutrients ; 16(12)2024 Jun 12.
Artigo em Inglês | MEDLINE | ID: mdl-38931198

RESUMO

This review offers a comprehensive evaluation of current aspects related to nutritional strategies, brain modulation, and muscle recovery, focusing on their applications and the underlying mechanisms of physiological adaptation for promoting a healthy brain, not only in athletes but also for recreationally active and inactive individuals. We propose that applying the rule, among others, of good sleep, regular exercise, and a properly balanced diet, defined as "SPARKS", will have a beneficial effect on the function and regeneration processes of the gut-brain-muscle axis. However, adopting the formula, among others, of poor sleep, stress, overtraining, and dysbiosis, defined as "SMOULDER", will have a detrimental impact on the function of this axis and consequently on human health as well as on athletes. Understanding these dynamics is crucial for optimizing brain health and cognitive function. This review highlights the significance of these factors for overall well-being, suggesting that adopting the "SPARKS" approach may benefit not only athletes but also older adults and individuals with health conditions.


Assuntos
Atletas , Desempenho Atlético , Encéfalo , Humanos , Encéfalo/fisiologia , Desempenho Atlético/fisiologia , Exercício Físico/fisiologia , Sono/fisiologia , Cognição/fisiologia , Eixo Encéfalo-Intestino/fisiologia , Fenômenos Fisiológicos da Nutrição Esportiva , Dieta , Microbioma Gastrointestinal/fisiologia
2.
Sensors (Basel) ; 24(12)2024 Jun 19.
Artigo em Inglês | MEDLINE | ID: mdl-38931756

RESUMO

Wearable in-ear electroencephalographic (EEG) devices hold significant promise for advancing brain monitoring technologies into everyday applications. However, despite the current availability of several in-ear EEG devices in the market, there remains a critical need for robust validation against established clinical-grade systems. In this study, we carried out a detailed examination of the signal performance of a mobile in-ear EEG device from Naox Technologies. Our investigation had two main goals: firstly, evaluating the hardware circuit's reliability through simulated EEG signal experiments and, secondly, conducting a thorough comparison between the in-ear EEG device and gold-standard EEG monitoring equipment. This comparison assesses correlation coefficients with recognized physiological patterns during wakefulness and sleep, including alpha rhythms, eye artifacts, slow waves, spindles, and sleep stages. Our findings support the feasibility of using this in-ear EEG device for brain activity monitoring, particularly in scenarios requiring enhanced comfort and user-friendliness in various clinical and research settings.


Assuntos
Eletroencefalografia , Processamento de Sinais Assistido por Computador , Dispositivos Eletrônicos Vestíveis , Eletroencefalografia/instrumentação , Eletroencefalografia/métodos , Humanos , Encéfalo/fisiologia , Sono/fisiologia , Monitorização Fisiológica/instrumentação , Monitorização Fisiológica/métodos , Vigília/fisiologia
3.
Zh Nevrol Psikhiatr Im S S Korsakova ; 124(5. Vyp. 2): 20-25, 2024.
Artigo em Russo | MEDLINE | ID: mdl-38934662

RESUMO

OBJECTIVE: To test the hypothesis of the difference between 3 means of sleep latency (SL) during falling asleep: accompanied by audio stimulus embedded with binaural beats (BB); after listening to suggestive body relaxation instructions; accompanied by audio stimulus embedded with BB after listening to suggestive body relaxation instructions (that is the combination of 1 and 2). MATERIAL AND METHODS: For the purpose of the study, a special Android application was developed and installed on the subjects' individual smartphones. The application assumed screen tapping test to control for fall-asleep process. The data of 63 subjects presented with the 3 types of sound stimuli mentioned above in a counterbalanced scheme were analyzed. RESULTS: Statistical analysis confirmed the initial hypothesis about the dependence of LS on the type of sound stimulus (p<0.05). Pairwise SL comparison showed reliable difference between stimuli (3) - 1149±113 s, and (1) - 1469±89 s (p<0.01). SL for the stimulus (2) had an intermediate value of 1269±112 s (difference from (1) at a trend level). CONCLUSION: The use of background sound embedded with BBs enhances the effect of suggestive instructions to improve sleep. But it is the suggestion as a psychotherapeutic technique that is determinant.


Assuntos
Estimulação Acústica , Humanos , Masculino , Feminino , Adulto , Estimulação Acústica/métodos , Adulto Jovem , Latência do Sono/fisiologia , Sono/fisiologia , Som , Pessoa de Meia-Idade
4.
Zh Nevrol Psikhiatr Im S S Korsakova ; 124(5. Vyp. 2): 8-13, 2024.
Artigo em Russo | MEDLINE | ID: mdl-38934660

RESUMO

Melatonin, as the hormone of the circadian system, plays a major role in regulating physiological functions and facilitating adaptation to environmental changes. Here we provide brief overview of circadian physiology, as related to the use of melatonin as hormone replacement therapy for older individuals with reduced melatonin secretion and melatonin treatment for patients with chronic insomnia or circadian desynchronization. Emphasizing the importance of minimal effective doses, we discuss the use of both immediate and delayed-release formulations, stress the significance of regular administration timing, and advise against exposure to bright light during increase in melatonin levels. Our discussion underscores that the medical guidance is essential for utilizing melatonin-containing preparations in the therapy of chronic insomnia.


Assuntos
Ritmo Circadiano , Melatonina , Sono , Melatonina/uso terapêutico , Humanos , Ritmo Circadiano/fisiologia , Ritmo Circadiano/efeitos dos fármacos , Sono/efeitos dos fármacos , Sono/fisiologia , Distúrbios do Início e da Manutenção do Sono/tratamento farmacológico , Terapia de Reposição Hormonal/métodos
5.
Zh Nevrol Psikhiatr Im S S Korsakova ; 124(5. Vyp. 2): 14-19, 2024.
Artigo em Russo | MEDLINE | ID: mdl-38934661

RESUMO

The development of views on cerebral activation in the wakefulness-sleep cycle, starting with the work of Constantin von Economo, is considered. The emphasis is on the cyclic activation of high-amplitude discharges in sleep, which, with known assumptions, can include K-complexes, as well as patterns of delta-like waves. Considering the participation of the peripheral nervous system in this, the integrative role of cyclic activation of high-amplitude discharges in the organization of the sleep-wake cycle is discussed.


Assuntos
Sono , Vigília , Humanos , Vigília/fisiologia , Sono/fisiologia , Eletroencefalografia , Encéfalo/fisiologia
6.
Zh Nevrol Psikhiatr Im S S Korsakova ; 124(5. Vyp. 2): 33-38, 2024.
Artigo em Russo | MEDLINE | ID: mdl-38934664

RESUMO

OBJECTIVE: To examine the influence of sleep quality on psychophysiological testing results and autonomic state in university students of both sexes with different habitual physical activity level. MATERIAL AND METHODS: One hundred and twenty-four 6th year medical students (88 women and 36 men) and 80 sport science students (42 women and 38 men) underwent a comprehensive psychophysiological study, including 7 tests: simple motor reaction, choice reaction, reaction under conditions of interference, reaction to a moving object, critical fusion frequency, as well as static and dynamic (by profile) dexterity tests. Autonomic status was assessed using heart rate variability, sleep quality and alertness were assessed based on self-report, and in athletes, using the Pittsburgh Sleep Quality Questionnaire (PSQI). RESULTS: In the male athletes' group with morning chronotype the sleep quality was better than in medical students. Only female medical students demonstrated a deterioration in praxis with an increase in the severity of evening features in the chronotype and a decrease in self-assessment of sleep quality. Increased sleepiness in the first half hour after awakening significantly reduced the quality of performance of psychometric tests in all subjects. The most informative was critical fusion frequency, which was lower in girls with «poor¼ sleep, as well as the reaction to a moving object. In addition, sympathetic drive was increased in female medical students with poor self-rated sleep quality. CONCLUSION: A decrease in the quality of sleep in students causes fine motor impairment, mediated by sex, the level of habitual physical activity and circadian chronotype.


Assuntos
Exercício Físico , Destreza Motora , Estudantes de Medicina , Humanos , Feminino , Masculino , Adulto Jovem , Destreza Motora/fisiologia , Exercício Físico/fisiologia , Estudantes de Medicina/psicologia , Adulto , Sono/fisiologia , Fatores Sexuais , Qualidade do Sono , Inquéritos e Questionários , Estudantes/psicologia
7.
Zh Nevrol Psikhiatr Im S S Korsakova ; 124(5. Vyp. 2): 79-86, 2024.
Artigo em Russo | MEDLINE | ID: mdl-38934670

RESUMO

The bidirectional relationship between cerebral structures and the gastrointestinal tract involving the microbiota embraces the scientific concept of the microbiota-gut-brain axis. The gut microbiome plays an important role in many physiological and biochemical processes of the human body, in the immune response and maintenance of homeostasis, as well as in the regulation of circadian rhythms. There is a relationship between the higher prevalence of a number of neurological disorders, sleep disorders and changes in the intestinal microbiota, which actualizes the study of the complex mechanisms of such correlation for the development of new treatment and prevention strategies. Environmental factors associated with excessive light exposure can aggravate the gut dysbiosis of intestinal microflora, and as a result, lead to sleep disturbances. This review examines the integrative mechanisms of sleep regulation associated with the gut microbiota (the role of neurotransmitters, short-chain fatty acids, unconjugated bile acids, bacterial cell wall components, cytokines). Taking into account the influence of gut dysbiosis as a risk factor in the development of various diseases, the authors systematize key aspects and modern scientific data on the importance of microflora balance to ensure optimal interaction along the microbiota-gut-brain axis in the context of the regulatory role of the sleep-wake cycle and its disorders.


Assuntos
Eixo Encéfalo-Intestino , Ritmo Circadiano , Disbiose , Microbioma Gastrointestinal , Transtornos do Sono-Vigília , Sono , Humanos , Microbioma Gastrointestinal/fisiologia , Ritmo Circadiano/fisiologia , Eixo Encéfalo-Intestino/fisiologia , Transtornos do Sono-Vigília/fisiopatologia , Transtornos do Sono-Vigília/microbiologia , Transtornos do Sono-Vigília/metabolismo , Sono/fisiologia , Encéfalo
8.
Zh Nevrol Psikhiatr Im S S Korsakova ; 124(5. Vyp. 2): 132-134, 2024.
Artigo em Russo | MEDLINE | ID: mdl-38934678

RESUMO

On November 17-18, 2023, the VII Scientific and Practical Conference "Clinical Somnology" was held in Moscow. The conference was organized by the all-Russian public organization "Russian Society of Somnologists" (ROS). The forum discussed the issues of diagnostics and treatment of sleep disorders, also presented the topics of fundamental research, discussed new ways of studying sleep and the prospects of development of somnology as a science. The conference was attended by more than 250 participants from 38 regions. Broadcasting of the sessions of the first day of the event was watched by more than 270 listeners. Within 2 days of the conference 14 symposiums were held and 52 reports were presented.


Assuntos
Transtornos do Sono-Vigília , Humanos , Transtornos do Sono-Vigília/diagnóstico , Transtornos do Sono-Vigília/terapia , Federação Russa , Sono/fisiologia , Moscou , Congressos como Assunto
9.
J Clin Neurophysiol ; 41(5): 430-443, 2024 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-38935657

RESUMO

SUMMARY: Although the role of sleep in modulating epileptic activity is well established, many epileptologists overlook the significance of considering sleep during presurgical epilepsy evaluations in cases of drug-resistant epilepsy. Here, we conducted a comprehensive literature review from January 2000 to May 2023 using the PubMed electronic database and compiled evidence to highlight the need to revise the current clinical approach. All articles were assessed for eligibility by two independent reviewers. Our aim was to shed light on the clinical value of incorporating sleep monitoring into presurgical evaluations with stereo-electroencephalography. We present the latest developments on the important bidirectional interactions between sleep and various forms of epileptic activity observed in stereo-electroencephalography recordings. Specifically, epileptic activity is modulated by different sleep stages, peaking in non-rapid eye movement sleep, while being suppressed in rapid eye movement sleep. However, this modulation can vary across different brain regions, underlining the need to account for sleep to accurately pinpoint the epileptogenic zone during presurgical assessments. Finally, we offer practical solutions, such as automated sleep scoring algorithms using stereo-electroencephalography data alone, to seamlessly integrate sleep monitoring into routine clinical practice. It is hoped that this review will provide clinicians with a readily accessible roadmap to the latest evidence concerning the clinical utility of sleep monitoring in the context of stereo-electroencephalography and aid the development of therapeutic and diagnostic strategies to improve patient surgical outcomes.


Assuntos
Eletroencefalografia , Humanos , Eletroencefalografia/métodos , Cuidados Pré-Operatórios/métodos , Sono/fisiologia , Epilepsia Resistente a Medicamentos/fisiopatologia , Epilepsia Resistente a Medicamentos/cirurgia , Epilepsia Resistente a Medicamentos/diagnóstico , Técnicas Estereotáxicas
10.
PLoS One ; 19(6): e0304845, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38935797

RESUMO

BACKGROUND: The elderly is commonly susceptible to depression, the symptoms for which may overlap with natural aging or other illnesses, and therefore miss being captured by routine screening questionnaires. Passive sensing data have been promoted as a tool for depressive symptoms detection though there is still limited evidence on its usage in the elderly. Therefore, this study aims to review current knowledge on the use of passive sensing data via smartphones and smartwatches in depressive symptom screening for the elderly. METHOD: The search of literature was performed in PubMed, IEEE Xplore digital library, and PsycINFO. Literature investigating the use of passive sensing data to screen, monitor, and/or predict depressive symptoms in the elderly (aged 60 and above) via smartphones and/or wrist-worn wearables was included for initial screening. Studies in English from international journals published between January 2012 to September 2022 were included. The reviewed studies were further analyzed by a narrative analysis. RESULTS: The majority of 21 included studies were conducted in Western countries with a few in Asia and Australia. Most studies adopted a cohort study design (n = 12), followed by cross-sectional design (n = 7) and a case-control design (n = 2). The most popular passive sensing data was related to sleep and physical activity using an actigraphy. Sleep characteristics, such as prolonged wakefulness after sleep onset, along with lower levels of physical activity, exhibited a significant association with depression. However, cohort studies expressed concerns regarding data quality stemming from incomplete follow-up and potential confounding effects. CONCLUSION: Passive sensing data, such as sleep, and physical activity parameters should be promoted for depressive symptoms detection. However, the validity, reliability, feasibility, and privacy concerns still need further exploration.


Assuntos
Depressão , Smartphone , Humanos , Depressão/diagnóstico , Idoso , Programas de Rastreamento/métodos , Programas de Rastreamento/instrumentação , Dispositivos Eletrônicos Vestíveis , Sono/fisiologia , Pessoa de Meia-Idade , Exercício Físico , Feminino
11.
BMC Neurol ; 24(1): 217, 2024 Jun 25.
Artigo em Inglês | MEDLINE | ID: mdl-38918750

RESUMO

OBJECTIVE: To investigate the association between total sleep duration variability and stroke in the middle-aged and elderly population in China. METHODS: Data were collected from the 2011, 2013, 2015, and 2018 surveys of the China Health and Retirement Longitudinal Study (CHARLS). A total of 3485 participants, who had not experienced a stroke until 2015 and completed the follow-up in 2018, were enrolled to analyze the relationship between total sleep duration variability and new stroke. Total sleep duration was calculated by summing self-reported nocturnal sleep duration and daytime napping. The variability was determined by calculating the standard deviation (SD) of total sleep duration across the first three waves. A binary logistic regression model was utilized to analyze this association. RESULTS: Of the 3485 participants, 183 (5.25%) sustained a stroke event. A dose-response relationship was observed, indicating an increased stroke risk of 0.2 per unit (hours) increase in total sleep duration variability [OR (95% CI): 1.20 (1.01-1.42)]. Upon stratification by sex groups, this increased risk was significant only in men [OR (95% CI): 1.44 (1.12-1.83)]. CONCLUSION: Increased total sleep duration variability was associated with an increased risk of stroke in the middle-aged and elderly, independent of factors such as age, nocturnal sleep duration, napping habits, region of residence, hypertension, diabetes mellitus, dyslipidemia, BMI, smoking, drinking habits, and marital status. However, a more notable correlation was observed in males.


Assuntos
Sono , Acidente Vascular Cerebral , Humanos , Masculino , Feminino , Pessoa de Meia-Idade , Idoso , China/epidemiologia , Sono/fisiologia , Acidente Vascular Cerebral/epidemiologia , Estudos Longitudinais , Fatores de Risco , Fatores de Tempo , Idoso de 80 Anos ou mais , Duração do Sono , População do Leste Asiático
12.
PLoS One ; 19(6): e0306218, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38924001

RESUMO

Sleep spindles are one of the prominent EEG oscillatory rhythms of non-rapid eye movement sleep. In the memory consolidation, these oscillations have an important role in the processes of long-term potentiation and synaptic plasticity. Moreover, the activity (spindle density and/or sigma power) of spindles has a linear association with learning performance in different paradigms. According to the experimental observations, the sleep spindle activity can be improved by closed loop acoustic stimulations (CLAS) which eventually improve memory performance. To examine the effects of CLAS on spindles, we propose a biophysical thalamocortical model for slow oscillations (SOs) and sleep spindles. In addition, closed loop stimulation protocols are applied on a thalamic network. Our model results show that the power of spindles is increased when stimulation cues are applied at the commencing of an SO Down-to-Up-state transition, but that activity gradually decreases when cues are applied with an increased time delay from this SO phase. Conversely, stimulation is not effective when cues are applied during the transition of an Up-to-Down-state. Furthermore, our model suggests that a strong inhibitory input from the reticular (RE) layer to the thalamocortical (TC) layer in the thalamic network shifts leads to an emergence of spindle activity at the Up-to-Down-state transition (rather than at Down-to-Up-state transition), and the spindle frequency is also reduced (8-11 Hz) by thalamic inhibition.


Assuntos
Eletroencefalografia , Sono de Ondas Lentas , Tálamo , Humanos , Sono de Ondas Lentas/fisiologia , Tálamo/fisiologia , Estimulação Acústica/métodos , Simulação por Computador , Modelos Neurológicos , Sono/fisiologia
13.
Nat Commun ; 15(1): 5415, 2024 Jun 26.
Artigo em Inglês | MEDLINE | ID: mdl-38926345

RESUMO

The claustrum has been linked to attention and sleep. We hypothesized that this reflects a shared function, determining responsiveness to stimuli, which spans the axis of engagement. To test this hypothesis, we recorded claustrum population dynamics from male mice during both sleep and an attentional task ('ENGAGE'). Heightened activity in claustrum neurons projecting to the anterior cingulate cortex (ACCp) corresponded to reduced sensory responsiveness during sleep. Similarly, in the ENGAGE task, heightened ACCp activity correlated with disengagement and behavioral lapses, while low ACCp activity correlated with hyper-engagement and impulsive errors. Chemogenetic elevation of ACCp activity reduced both awakenings during sleep and impulsive errors in the ENGAGE task. Furthermore, mice employing an exploration strategy in the task showed a stronger correlation between ACCp activity and performance compared to mice employing an exploitation strategy which reduced task complexity. Our results implicate ACCp claustrum neurons in restricting engagement during sleep and goal-directed behavior.


Assuntos
Claustrum , Giro do Cíngulo , Neurônios , Sono , Animais , Giro do Cíngulo/fisiologia , Masculino , Sono/fisiologia , Neurônios/fisiologia , Neurônios/metabolismo , Camundongos , Claustrum/fisiologia , Camundongos Endogâmicos C57BL , Comportamento Animal/fisiologia , Atenção/fisiologia , Vigília/fisiologia
14.
JMIR Public Health Surveill ; 10: e51585, 2024 Jun 11.
Artigo em Inglês | MEDLINE | ID: mdl-38861716

RESUMO

BACKGROUND: Sleep health is a multidimensional construct that includes objective and subjective parameters and is influenced by individual sleep-related behaviors and sleep disorders. Symptom network analysis allows modeling of the interactions between variables, enabling both the visualization of relationships between different factors and the identification of the strength of those relationships. Given the known influence of sex and age on sleep health, network analysis can help explore sets of mutually interacting symptoms relative to these demographic variables. OBJECTIVE: This study aimed to study the centrality of symptoms and compare age and sex differences regarding sleep health using a symptom network approach in a large French population that feels concerned about their sleep. METHODS: Data were extracted from a questionnaire provided by the Réseau Morphée health network. A network analysis was conducted on 39 clinical variables related to sleep disorders and sleep health. After network estimation, statistical analyses consisted of calculating inferences of centrality, robustness (ie, testifying to a sufficient effect size), predictability, and network comparison. Sleep clinical variable centralities within the networks were analyzed by both sex and age using 4 age groups (18-30, 31-45, 46-55, and >55 years), and local symptom-by-symptom correlations determined. RESULTS: Data of 35,808 participants were obtained. The mean age was 42.7 (SD 15.7) years, and 24,964 (69.7%) were women. Overall, there were no significant differences in the structure of the symptom networks between sexes or age groups. The most central symptoms across all groups were nonrestorative sleep and excessive daytime sleepiness. In the youngest group, additional central symptoms were chronic circadian misalignment and chronic sleep deprivation (related to sleep behaviors), particularly among women. In the oldest group, leg sensory discomfort and breath abnormality complaint were among the top 4 central symptoms. Symptoms of sleep disorders thus became more central with age than sleep behaviors. The high predictability of central nodes in one of the networks underlined its importance in influencing other nodes. CONCLUSIONS: The absence of structural difference between networks is an important finding, given the known differences in sleep between sexes and across age groups. These similarities suggest comparable interactions between clinical sleep variables across sexes and age groups and highlight the implication of common sleep and wake neural circuits and circadian rhythms in understanding sleep health. More precisely, nonrestorative sleep and excessive daytime sleepiness are central symptoms in all groups. The behavioral component is particularly central in young people and women. Sleep-related respiratory and motor symptoms are prominent in older people. These results underscore the importance of comprehensive sleep promotion and screening strategies tailored to sex and age to impact sleep health.


Assuntos
Transtornos do Sono-Vigília , Humanos , Feminino , Masculino , Adulto , Pessoa de Meia-Idade , Adolescente , Adulto Jovem , Fatores Etários , Inquéritos e Questionários , Transtornos do Sono-Vigília/epidemiologia , França/epidemiologia , Fatores Sexuais , Idoso , Sono/fisiologia
15.
JMIR Nurs ; 7: e56616, 2024 Jun 12.
Artigo em Inglês | MEDLINE | ID: mdl-38865177

RESUMO

BACKGROUND: One issue to be considered in universities is the need for interventions to improve sleep quality and educational systems for university students. However, sleep problems remain unresolved. As a clinical practice technique, a mindfulness-based stress reduction method can help students develop mindfulness skills to cope with stress, self-healing skills, and sleep. OBJECTIVE: We aim to verify the effectiveness of mindful breathing exercises using a tablet device. METHODS: In total, 18 nursing students, aged 18-22 years, were randomly assigned and divided equally into mindfulness (Mi) and nonmindfulness (nMi) implementation groups using tablet devices. During the 9-day experimental period, cardiac potentials were measured on days 1, 5, and 9. In each sleep stage (sleep with sympathetic nerve dominance, shallow sleep with parasympathetic nerve dominance, and deep sleep with parasympathetic nerve dominance), low frequency (LF) value, high frequency (HF) value, and LF/HF ratios obtained from the cardiac potentials were evaluated. RESULTS: On day 5, a significant correlation was observed between sleep duration and each sleep stage in both groups. In comparison to each experimental day, the LF and LF/HF ratios of the Mi group were significantly higher on day 1 than on days 5 and 10. LF and HF values in the nMi group were significantly higher on day 1 than on day 5. CONCLUSIONS: The correlation between sleep duration and each sleep stage on day 5 suggested that sleep homeostasis in both groups was activated on day 5, resulting in similar changes in sleep stages. During the experimental period, the cardiac potentials in the nMi group showed a wide range of fluctuations, whereas the LF values and LF/HF ratio in the Mi group showed a decreasing trend over time. This finding suggests that implementing mindful breathing exercises using a tablet device may suppress sympathetic activity during sleep. TRIAL REGISTRATION: UMIN-CTR Clinical Trials Registry UMIN000054639; https://tinyurl.com/mu2vdrks.


Assuntos
Sistema Nervoso Autônomo , Sono , Humanos , Masculino , Feminino , Adulto Jovem , Adolescente , Sistema Nervoso Autônomo/fisiologia , Sono/fisiologia , Atenção Plena/métodos , Atenção Plena/instrumentação , Exercícios Respiratórios/métodos , Exercícios Respiratórios/instrumentação , Computadores de Mão , Estudantes de Enfermagem/psicologia
16.
Nature ; 630(8018): 935-942, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38867049

RESUMO

Memories benefit from sleep1, and the reactivation and replay of waking experiences during hippocampal sharp-wave ripples (SWRs) are considered to be crucial for this process2. However, little is known about how these patterns are impacted by sleep loss. Here we recorded CA1 neuronal activity over 12 h in rats across maze exploration, sleep and sleep deprivation, followed by recovery sleep. We found that SWRs showed sustained or higher rates during sleep deprivation but with lower power and higher frequency ripples. Pyramidal cells exhibited sustained firing during sleep deprivation and reduced firing during sleep, yet their firing rates were comparable during SWRs regardless of sleep state. Despite the robust firing and abundance of SWRs during sleep deprivation, we found that the reactivation and replay of neuronal firing patterns was diminished during these periods and, in some cases, completely abolished compared to ad libitum sleep. Reactivation partially rebounded after recovery sleep but failed to reach the levels found in natural sleep. These results delineate the adverse consequences of sleep loss on hippocampal function at the network level and reveal a dissociation between the many SWRs elicited during sleep deprivation and the few reactivations and replays that occur during these events.


Assuntos
Região CA1 Hipocampal , Células Piramidais , Privação do Sono , Sono , Animais , Privação do Sono/fisiopatologia , Ratos , Masculino , Células Piramidais/fisiologia , Sono/fisiologia , Região CA1 Hipocampal/fisiologia , Região CA1 Hipocampal/citologia , Hipocampo/fisiologia , Hipocampo/citologia , Vigília/fisiologia , Aprendizagem em Labirinto/fisiologia , Memória/fisiologia , Ratos Sprague-Dawley
17.
Learn Mem ; 31(5)2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38876486

RESUMO

The brain constantly compares past and present experiences to predict the future, thereby enabling instantaneous and future behavioral adjustments. Integration of external information with the animal's current internal needs and behavioral state represents a key challenge of the nervous system. Recent advancements in dissecting the function of the Drosophila mushroom body (MB) at the single-cell level have uncovered its three-layered logic and parallel systems conveying positive and negative values during associative learning. This review explores a lesser-known role of the MB in detecting and integrating body states such as hunger, thirst, and sleep, ultimately modulating motivation and sensory-driven decisions based on the physiological state of the fly. State-dependent signals predominantly affect the activity of modulatory MB input neurons (dopaminergic, serotoninergic, and octopaminergic), but also induce plastic changes directly at the level of the MB intrinsic and output neurons. Thus, the MB emerges as a tightly regulated relay station in the insect brain, orchestrating neuroadaptations due to current internal and behavioral states leading to short- but also long-lasting changes in behavior. While these adaptations are crucial to ensure fitness and survival, recent findings also underscore how circuit motifs in the MB may reflect fundamental design principles that contribute to maladaptive behaviors such as addiction or depression-like symptoms.


Assuntos
Comportamento Animal , Corpos Pedunculados , Animais , Corpos Pedunculados/fisiologia , Comportamento Animal/fisiologia , Sono/fisiologia , Fome/fisiologia , Drosophila/fisiologia , Sede/fisiologia , Neurônios/fisiologia
18.
BMC Med ; 22(1): 261, 2024 Jun 24.
Artigo em Inglês | MEDLINE | ID: mdl-38915009

RESUMO

BACKGROUND: To assess the largely undetermined separate and joint effects of sleep and liver function biomarkers on liver cancer. METHODS: Data of 356,894 participants without cancer at baseline in the UK Biobank were analyzed. Sleep score was evaluated using five sleep traits (sleep duration, chronotype, insomnia, snoring, and excessive daytime sleepiness) and dichotomized into healthy or unhealthy sleep. Circulating liver function biomarkers were measured. Cox proportional hazard model was performed to investigate the independent and joint associations of sleep and liver function biomarkers with liver cancer incidence. RESULTS: After a median follow-up time of 13.1 years, 394 cases of incident liver cancer were documented. The multivariable-adjusted hazard ratio (HR) for liver cancer was 1.46 (95% confidence interval: 1.15-1.85) associated with unhealthy sleep (vs. healthy sleep), and was 1.17 (1.15-1.20), 1.20 (1.18-1.22), 1.69 (1.47-1.93), 1.06 (1.06-1.07), 1.08 (1.07-1.09), 1.81 (1.37-2.39), or 0.29 (0.18-0.46) associated with each 10-unit increase in alanine transaminase (ALT), aspartate transaminase (AST), total bilirubin (TBIL), gamma-glutamyl transferase (GGT), alkaline phosphatase (ALP), total protein (TP), or albumin (ALB), respectively. Individuals with unhealthy sleep and high (≥ median) ALT, AST, TBIL, GGT, ALP, or TP or low (< median) ALB level had the highest HR of 3.65 (2.43-5.48), 4.03 (2.69-6.03), 1.97 (1.40-2.77), 4.69 (2.98-7.37), 2.51 (1.75-3.59), 2.09 (1.51-2.89), or 2.22 (1.55-3.17) for liver cancer, respectively. Significant additive interaction of unhealthy sleep with high TP level on liver cancer was observed with relative excess risk due to an interaction of 0.80 (0.19-1.41). CONCLUSIONS: Unhealthy sleep was associated with an increased risk of liver cancer, especially in participants with lower ALB levels or higher levels of ALT, AST, TBIL, GGT, ALP, or particularly TP.


Assuntos
Biomarcadores , Neoplasias Hepáticas , Sono , Humanos , Masculino , Feminino , Pessoa de Meia-Idade , Neoplasias Hepáticas/epidemiologia , Neoplasias Hepáticas/sangue , Estudos Prospectivos , Sono/fisiologia , Biomarcadores/sangue , Idoso , Reino Unido/epidemiologia , Adulto , Incidência , Testes de Função Hepática , Fatores de Risco , Fígado
19.
Aerosp Med Hum Perform ; 95(7): 381-389, 2024 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-38915172

RESUMO

INTRODUCTION: Most airline pilots reported having suffered from sleep disorders and fatigue due to circadian disruption, a potential risk to flight safety. This study attempted to uncover the actual scenario of circadian disruption and working load status among airline pilots.METHODS: In study 1, 21 pilots were invited to participate in a 14-d sleep monitoring and a dual 2-back test to monitor their sleep patterns and cognitive function level. To provide an in-depth view, data from scheduled flights, including 567 airline pilots, was analyzed in Study 2. The present study used cluster analysis to reflect the distribution of the flight scheduling characteristics, including working time and actual working hours. A simulation model was then developed to predict the pilots' 1-mo sleep-wake pattern.RESULTS: The results indicated that sleep problems were prevalent in this population, especially the night before an earlier morning shift. Regarding the cognitive test, they scored the lowest on earlier morning shifts compared with daytime and evening shifts. It was found that over 70% of the flight schedules can lead to circadian disruption, and 47.44% of the pilots worked under high-load status.DISCUSSION: Airline pilots inevitably work irregular hours and the current policies for coping with circadian disruption seem inefficient. This study thus calls for urgency in improving scheduling and fatigue management systems from the circadian rhythm perspective.Yang SX, Cheng S, Sun Y, Tang X, Huang Z. Circadian disruption in civilian airline pilots. Aerosp Med Hum Perform. 2024; 95(7):381-389.


Assuntos
Medicina Aeroespacial , Ritmo Circadiano , Pilotos , Tolerância ao Trabalho Programado , Humanos , Masculino , Adulto , Pilotos/estatística & dados numéricos , Tolerância ao Trabalho Programado/fisiologia , Ritmo Circadiano/fisiologia , Fadiga/fisiopatologia , Fadiga/etiologia , Transtornos do Sono do Ritmo Circadiano/epidemiologia , Transtornos do Sono do Ritmo Circadiano/fisiopatologia , Pessoa de Meia-Idade , Sono/fisiologia , Cognição/fisiologia , Transtornos do Sono-Vigília/epidemiologia , Transtornos do Sono-Vigília/fisiopatologia
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