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Neural fatigue

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https://www.readbyqxmd.com/read/29136305/neural-basis-of-exertional-fatigue-in-the-heat-a-review-of-magnetic-resonance-imaging-methods
#1
REVIEW
X R Tan, Ivan C C Low, Mary C Stephenson, T W Soong, Jason K W Lee
The central nervous system, specifically the brain, is implicated in the development of exertional fatigue under a hot environment. Diverse neuroimaging techniques have been used to visualize the brain activity during or after exercise. Notably, the use of magnetic resonance imaging (MRI) has become prevalent due to its excellent spatial resolution and versatility. This review evaluates the significance and limitations of various brain MRI techniques in exercise studies - brain volumetric analysis, functional MRI, functional connectivity MRI and arterial spin labelling...
November 14, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29131813/mechanical-fatigue-resistance-of-an-implantable-branched-lead-system-for-a-distributed-set-of-longitudinal-intrafascicular-electrodes
#2
A E Pena, S S Kuntaegowdanahalli, J J Abbas, J Patrick, K W Horch, R Jung
OBJECTIVE: A neural interface system has been developed that consists of an implantable stimulator/recorder can with a 15-electrode lead that trifurcates into three bundles of five individual wire longitudinal intrafascicular electrodes. This work evaluated the mechanical fatigue resistance of the branched lead and distributed electrode system under conditions designed to mimic anticipated strain profiles that would be observed after implantation in the human upper arm. APPROACH: Custom test setups and procedures were developed to apply linear or angular strain at four critical stress riser points on the lead and electrode system...
November 13, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29113572/effects-of-an-individual-12-week-community-located-start-to-run-program-on-physical-capacity-walking-fatigue-cognitive-function-brain-volumes-and-structures-in-persons-with-multiple-sclerosis
#3
Peter Feys, Lousin Moumdjian, Florian Van Halewyck, Inez Wens, Bert O Eijnde, Bart Van Wijmeersch, Veronica Popescu, Paul Van Asch
BACKGROUND: Exercise therapy studies in persons with multiple sclerosis (pwMS) primarily focused on motor outcomes in mid disease stage, while cognitive function and neural correlates were only limitedly addressed. OBJECTIVES: This pragmatic randomized controlled study investigated the effects of a remotely supervised community-located "start-to-run" program on physical and cognitive function, fatigue, quality of life, brain volume, and connectivity. METHOD: In all, 42 pwMS were randomized to either experimental (EXP) or waiting list control (WLC) group...
November 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/29066558/orientation-tuning-of-correlated-activity-in-the-developing-lateral-geniculate-nucleus
#4
Caitlin W Kiley, W Martin Usrey
Neural circuits and the cells that comprise them undergo developmental changes in the spatial organization of their connections and in their temporal response properties. Within the lateral geniculate nucleus (LGN) of the dorsal thalamus, these changes have pronounced effects on the spatiotemporal receptive fields (STRFs) of neurons. An open and unresolved question is how STRF maturation affects stimulus-evoked correlated activity between pairs of LGN neurons during development. This is an important question to answer as stimulus-evoked correlated activity likely plays a role in establishing the specificity of thalamocortical connectivity and the receptive fields of postsynaptic cortical neurons...
October 24, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29061491/neural-mechanisms-of-mental-fatigue-elicited-by-sustained-auditory-processing
#5
Travis M Moore, Alexandra P Key, Antonia Thelen, Benjamin W Y Hornsby
Despite growing evidence that prolonged episodes of effortful listening can lead to mental fatigue, little work has been done to examine the patterns of brain activation associated with listening over time. In order to gain a better understanding of the nature of listening-related mental fatigue, this study characterized the effects of sustained auditory processing on brain activation in 19 adults with normal hearing. A 50-min, auditory choice paradigm served as the fatiguing task. Mental fatigue was quantified using subjective (self-report) and behavioral (response time and accuracy) measures, as well as event-related potential (ERP) measures indexing motivation (error-related negativity; ERN) and general arousal (N1)...
October 20, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29060240/channels-selection-using-independent-component-analysis-and-scalp-map-projection-for-eeg-based-driver-fatigue-classification
#6
Rifai Chai, Ganesh R Naik, Sai Ho Ling, Yvonne Tran, Ashley Craig, Hung T Nguyen
This paper presents a classification of driver fatigue with electroencephalography (EEG) channels selection analysis. The system employs independent component analysis (ICA) with scalp map back projection to select the dominant of EEG channels. After channel selection, the features of the selected EEG channels were extracted based on power spectral density (PSD), and then classified using a Bayesian neural network. The results of the ICA decomposition with the back-projected scalp map and a threshold showed that the EEG channels can be reduced from 32 channels into 16 dominants channels involved in fatigue assessment as chosen channels, which included AF3, F3, FC1, FC5, T7, CP5, P3, O1, P4, P8, CP6, T8, FC2, F8, AF4, FP2...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29053725/the-effects-of-training-with-loads-that-maximise-power-output-and-individualised-repetitions-vs-traditional-power-training
#7
J M Sarabia, M Moya-Ramón, J L Hernández-Davó, J Fernandez-Fernandez, R Sabido
BACKGROUND: It has been suggested that strength training effects (i.e. neural or structural) vary, depending on the total repetitions performed and velocity loss in each training set. PURPOSE: The aim of this study is to compare the effects of two training programmes (i.e. one with loads that maximise power output and individualised repetitions, and the other following traditional power training). METHODS: Twenty-five males were divided into three groups (optimum power [OP = 10], traditional training [TT = 9] and control group [CG = 6])...
2017: PloS One
https://www.readbyqxmd.com/read/29045952/-progress-in-diagnosis-and-management-of-syncope-in-children
#8
W R Xu, Y Liao, H F Jin, Q Y Zhang, C S Tang, J B DU
Syncope is a common emergency of children and adolescents, which has serious influence on the quality of life. Neurally-mediated syncope, including postural tachycardia syndrome, vasovagal syncope, orthostatic hypotension and orthostatic hypertension, is the main cause of syncope in children and adolescents. The main manifestations of neurally-mediated syncope are diverse, such as dizziness, headache, chest tightness, chest pain, pale complexion, fatigue, pre-syncope and syncope. Although the clinical manifestations are similar, each subtype of syncope has its hemodynamic feature and optimal treatment option...
October 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/29036151/automatic-identification-of-fungi-in-microscopic-leucorrhea-images
#9
Jing Zhang, Songhan Lu, Xiangzhou Wang, Xiaohui Du, Guangming Ni, Juanxiu Liu, Lin Liu, Yong Liu
Identifying fungi in microscopic leucorrhea images provides important information for evaluating gynecological diseases. Subjective judgment and fatigue can greatly affect recognition accuracy. This paper proposes an automatic identification system to detect fungi in leucorrhea images that incorporates a convolutional neural network, the histogram of oriented gradients algorithm, and a binary support vector machine. In experiments, the detection rate of the positive samples was as high as 99.8%. The experimental results demonstrate the effectiveness of the proposed method and its potential as a primary software component of a completely automated system...
September 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28985942/effects-of-pyridostigmine-bromide-on-sh-sy5y-cells-an-in-vitro-neuroblastoma-neurotoxicity-model
#10
VerÔnica Farina Azzolin, Fernanda Barbisan, Luana Suéling Lenz, Cibele Ferreira Teixeira, Milena Fortuna, Thiago Duarte, Marta Maria Frescura Medeiros Duarte, Ivana Beatrice Mânica da Cruz
Pyridostigmine bromide (PB) is a reversible acetylcholinesterase (AChE) inhibitor and the first-choice for the treatment of symptoms associated with myasthenia gravis and other neuromuscular junction disorders. However, evidence suggested that PB could be associated with the Gulf War Illness characterised by the presence of fatigue, headaches, cognitive dysfunction, and musculoskeletal respiratory and gastrointestinal disturbances. Given that a potential neurotoxic effect of PB has not yet been completely elucidated, the present investigation used neural SH-SY5Y cells to evaluate the effect of PB on the cellular viability, cell apoptosis, modulation of the cell cycle, oxidative stress, and genotoxicity variables, which indicate neurodegeneration...
November 2017: Mutation Research
https://www.readbyqxmd.com/read/28983280/fatigue-and-cognitive-fatigability-in-mild-traumatic-brain-injury-are-correlated-with-altered-neural-activity-during-vigilance-test-performance
#11
Marika C Möller, Love Engström Nordin, Aniko Bartfai, Per Julin, Tie-Qiang Li
INTRODUCTION: Fatigue is the most frequently reported persistent symptom following a mild traumatic brain injury (mTBI), but the explanations for the persisting fatigue symptoms in mTBI remain controversial. In this study, we investigated the change of cerebral blood flow during the performance of a psychomotor vigilance task (PVT) by using pseudo-continuous arterial spin labeling (PCASL) MRI technique to better understand the relationship between fatigability and brain activity in mTBI...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28983275/cortical-substrate-of-supraspinal-fatigue-following-exhaustive-aerobic-exercise-localizes-to-a-large-cluster-in-the-anterior-premotor-cortex
#12
Priyantha Herath, Martin Carmichael, Angela Murphy, Leonardo Bonilha, Roger Newman-Norlund, Chris Rorden, Mark Davis
Strenuous exercise leads to a progressive reduction in the performance of voluntary physical exercise. This is due to a process described as fatigue and is defined as the failure to maintain the required or expected power output. While some of this is muscular in origin, there are data suggestive of how fatigue is modulated by cortical signals, leading to a concept of central fatigue. The previously reported fatigue-induced changes in cortical activity may have been due to blood oxygen-dependent (BOLD) signal drift and/or neural habituation alone...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28966996/confused-or-not-confused-disentangling-brain-activity-from-eeg-data-using-bidirectional-lstm-recurrent-neural-networks
#13
Zhaoheng Ni, Ahmet Cem Yuksel, Xiuyan Ni, Michael I Mandel, Lei Xie
Brain fog, also known as confusion, is one of the main reasons for low performance in the learning process or any kind of daily task that involves and requires thinking. Detecting confusion in a human's mind in real time is a challenging and important task that can be applied to online education, driver fatigue detection and so on. In this paper, we apply Bidirectional LSTM Recurrent Neural Networks to classify students' confusion in watching online course videos from EEG data. The results show that Bidirectional LSTM model achieves the state-of-the-art performance compared with other machine learning approaches, and shows strong robustness as evaluated by cross-validation...
August 2017: ACM-BCB: ACM Conference on Bioinformatics, Computational Biology and Biomedicine
https://www.readbyqxmd.com/read/28960342/temporal-dynamics-of-reactive-cognitive-control-as-revealed-by-event-related-brain-potentials
#14
Curtis D Von Gunten, Hannah I Volpert-Esmond, Bruce D Bartholow
Reactive cognitive control refers to a complementary set of cognitive operations by which individuals monitor for and detect the presence of goal-interfering conflict (i.e., conflict monitoring/evaluation) and, subsequently, initiate attention-focusing and response selection processes to bolster goal-directed action in the face of such conflict (regulative control). The purpose of the current study was to characterize the nature of conflict adaptation in both components of this dynamic process across sequences of trials and, more broadly, across time as participants complete a cognitive control task...
September 28, 2017: Psychophysiology
https://www.readbyqxmd.com/read/28955298/subjective-cognitive-fatigue-and-autonomic-abnormalities-in-multiple-sclerosis-patients
#15
Carina Sander, Helmut Hildebrandt, Hans-Peter Schlake, Paul Eling, Katrin Hanken
BACKGROUND: Cognitive fatigue and autonomic abnormalities are frequent symptoms in MS. Our model of MS-related fatigue assumes a shared neural network for cognitive fatigue and autonomic failures, i.e., aberrant vagus nerve activity induced by inflammatory processes. Therefore, they should occur in common. OBJECTIVE: To explore the relationship between cognitive fatigue and autonomic symptoms in MS patients, using self-reported questionnaires. METHODS: In 95 MS patients, cognitive fatigue was assessed with the Fatigue Scale for Motor and Cognitive Functions and autonomic abnormalities with the Composite Autonomic Symptom Scale-31 (COMPASS-31)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28930973/intracortical-inhibition-within-the-primary-motor-cortex-can-be-modulated-by-changing-the-focus-of-attention
#16
Yves-Alain Kuhn, Martin Keller, Jan Ruffieux, Wolfgang Taube
It is well recognized that an external focus (EF) compared with an internal focus (IF) of attention improves motor learning and performance. Studies have indicated benefits in accuracy, balance, force production, jumping performance, movement speed, oxygen consumption, and fatiguing task. Although behavioral outcomes of using an EF strategy are well explored, the underlying neural mechanisms remain unknown. A recent TMS study compared the activity of the primary motor cortex (M1) between an EF and an IF. More precisely, this study showed that, when adopting an EF, the activity of intracortical inhibitory circuits is enhanced...
September 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28918694/brain-metabolic-correlates-of-fatigue-in-parkinson-s-disease-a-pet-study
#17
Li Zhang, Tiannv Li, Yongsheng Yuan, Qing Tong, Siming Jiang, Min Wang, Jianwei Wang, Jian Ding, Qinrong Xu, Kezhong Zhang
The neural bases of fatigue in Parkinson's disease (PD) remain uncertain. We aimed to assess the brain metabolic correlates of fatigue in patients with PD. Twenty-seven PD patients without clinically relevant depression (17-item Hamilton Depression Rating Scale [HAMD] score ≥ 14), apathy (Apathy Scale [AS] score ≥ 14) and excessive daytime somnolence (Epworth Sleepiness Scale [ESS] score ≥ 10) were evaluated with Fatigue Severity Scale (FSS). Each patient had an F-18 fluorodeoxyglucose PET (FDG-PET) scan...
September 18, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/28895910/a-false-alarm-reduction-method-for-a-gas-sensor-based-electronic-nose
#18
Mohammad Mizanur Rahman, Chalie Charoenlarpnopparut, Prapun Suksompong, Pisanu Toochinda, Attaphongse Taparugssanagorn
Electronic noses (E-Noses) are becoming popular for food and fruit quality assessment due to their robustness and repeated usability without fatigue, unlike human experts. An E-Nose equipped with classification algorithms and having open ended classification boundaries such as the k-nearest neighbor (k-NN), support vector machine (SVM), and multilayer perceptron neural network (MLPNN), are found to suffer from false classification errors of irrelevant odor data. To reduce false classification and misclassification errors, and to improve correct rejection performance; algorithms with a hyperspheric boundary, such as a radial basis function neural network (RBFNN) and generalized regression neural network (GRNN) with a Gaussian activation function in the hidden layer should be used...
September 12, 2017: Sensors
https://www.readbyqxmd.com/read/28879576/effects-of-acute-resistance-training-modality-on-corticospinal-excitability-intra-cortical-and-neuromuscular-responses
#19
Christopher Latella, Wei-Peng Teo, Dale Harris, Brendan Major, Dan VanderWesthuizen, Ashlee M Hendy
OBJECTIVE: Although neural adaptations from strength training are known to occur, the acute responses associated with heavy-strength (HST) and hypertrophy training (HYT) remain unclear. Therefore, we aimed to compare the acute behaviour of corticospinal responses following a single session of HST vs HYT over a 72-h period. METHODS: Fourteen participants completed a random counterbalanced, crossover study that consisted of a single HST session [5 sets × 3 repetition maximum (RM)], a HYT session (3 sets × 12 RM) of the leg extensors and a control session (CON)...
November 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28852828/exercise-related-sensations-contribute-to-decrease-power-during-repeated-cycle-sprints-with-limited-influence-on-neural-drive
#20
Olivier Girard, François Billaut, Ryan J Christian, Paul S Bradley, David J Bishop
PURPOSES: We manipulated the inspired oxygen fraction (FiO2) to examine the effects of physiological perturbations on exercise-related sensations and the neural drive of the quadriceps during repeated, brief, maximal cycle sprints. METHODS: Nine active males completed a repeated sprint cycle protocol (10 × 4-s maximal sprints with 30 s of passive recovery) in normoxia (NM; FiO2 0.21) and severe normobaric hypoxia (HY; FiO2 0.13). Peak power, quadriceps Root Mean Squared electromyography (RMS EMG), physiological (heart rate, arterial oxygen saturation, blood lactate concentration) and perceptual responses were recorded...
November 2017: European Journal of Applied Physiology
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