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Neural fatigue

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https://www.readbyqxmd.com/read/28803797/m-wave-normalization-of-emg-signal-to-investigate-heat-stress-and-fatigue
#1
Olivier Girard, David J Bishop, Sébastien Racinais
OBJECTIVES: We examined the extent to which peripheral changes affect EMG signal adjustments during repeated sprinting in temperate and hot conditions. DESIGN: Randomised, crossover study. METHODS: Ten males performed 10×6-s 'all-out' cycling sprints (recovery=30s) in either a temperate (24°C/30%rH) or a hot (35°C/40%rH) environment with concomitant surface EMG recordings of the vastus lateralis (VL) and rectus femoris (RF). In addition, peak-to-peak M-wave amplitudes were obtained for each muscle after each sprint (i...
July 31, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28797855/exploring-genetic-attributions-underlying-radiotherapy-induced-fatigue-in-prostate-cancer-patients
#2
Sepehr Hashemi, Juan Luis Fernandez Martinez, Leorey Saligan, Stephen Sonis
CONTEXT: Despite numerous proposed mechanisms, no definitive pathophysiology underlying Radiotherapy-Induced Fatigue (RIF) has been established. However, the dysregulation of a set of 35 genes was recently validated to predict development of fatigue in prostate cancer patients (PCP's) receiving radiotherapy. OBJECTIVES: To hypothesize novel pathways, and provide genetic targets for currently proposed pathways implicated in RIF development through analysis of the previously validated gene set...
August 7, 2017: Journal of Pain and Symptom Management
https://www.readbyqxmd.com/read/28764994/alexithymia-in-multiple-sclerosis-a-systematic-review-of-literature
#3
REVIEW
Moussa A Chalah, Samar S Ayache
BACKGROUND: Alexithymia is a multidimensional personality construct characterized by difficulties identifying and describing one's feelings, and externally oriented thinking. Although extensively reported in psychiatric patients, little attention has been paid regarding its occurrence and its pathophysiology in the context of multiple sclerosis (MS). METHODS: A research was conducted according to the PRISMA guidelines aiming to identify original research articles in English and French languages about alexithymia in MS...
July 29, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28762503/mechanomyography-based-wearable-monitor-of-quasi-isometric-muscle-fatigue-for-motor-neural-prostheses
#4
Eddy Krueger, Lana Popović-Maneski, Percy Nohama
A motor neural prosthesis based on surface functional electrical stimulation (sFES) can restore functional movement (e.g., standing, walking) in patients with a spinal cord injury (SCI). sFES generates muscle contractions in antigravity muscles and allows balance-assisted standing. This induced standing has several benefits, such as improved cardiovascular function, decreased incidence of urinary infections, reduced joint contractures, and muscle atrophy. The duration of sFES assisted standing is limited due to the quick onset of muscle fatigue...
August 1, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28758313/altered-theta-oscillations-in-resting-eeg-of-fibromyalgia-syndrome-patients
#5
N Fallon, Y Chiu, T Nurmikko, A Stancak
BACKGROUND: Fibromyalgia syndrome (FM) is a chronic pain disorder characterized by widespread pain, sleep disturbance, fatigue and cognitive/affective symptoms. Functional imaging studies have revealed that FM and other chronic pain syndromes can affect resting brain activity. This study utilized electroencephalographic (EEG) recordings to investigate the relative power of ongoing oscillatory activity in the resting brain. METHODS: A 64-channel EEG was recorded at rest in 19 female FM patients and 18 healthy, age-matched, control subjects...
July 31, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28702901/implications-of-impaired-endurance-performance-following-single-bouts-of-resistance-training-an-alternate-concurrent-training-perspective
#6
REVIEW
Kenji Doma, Glen B Deakin, David J Bentley
A single bout of resistance training induces residual fatigue, which may impair performance during subsequent endurance training if inadequate recovery is allowed. From a concurrent training standpoint, such carry-over effects of fatigue from a resistance training session may impair the quality of a subsequent endurance training session for several hours to days with inadequate recovery. The proposed mechanisms of this phenomenon include: (1) impaired neural recruitment patterns; (2) reduced movement efficiency due to alteration in kinematics during endurance exercise and increased energy expenditure; (3) increased muscle soreness; and (4) reduced muscle glycogen...
July 12, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28702807/effect-of-rest-pause-vs-traditional-bench-press-training-on-muscle-strength-electromyography-and-lifting-volume-in-randomized-trial-protocols
#7
J Adam Korak, Max R Paquette, Justin Brooks, Dana K Fuller, John M Coons
PURPOSE: Rest-pause (4-s unloaded rest between repetitions) training effects on one repetition maximum (1 RM), lifting volume, and neural activation via electromyography (EMG) are currently vague in the literature and can benefit strength and conditioning professionals for resistance training programme design. Therefore, this study compared 1 RM, neural activation via (EMG), and volume differences between rest-pause vs. traditional resistance training. METHODS: Trained males (N = 20) were randomly assigned to either a rest-pause or a traditional training group...
July 12, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28681715/motor-cortex-trns-improves-pain-affective-and-cognitive-impairment-in-patients-with-fibromyalgia-preliminary-results-of-a-randomised-sham-controlled-trial
#8
Massimiliano Curatolo, Giuseppe La Bianca, Giuseppe Cosentino, Roberta Baschi, Giuseppe Salemi, Rossella Talotta, Marcello Romano, Giovanni Triolo, Marina De Tommaso, Brigida Fierro, Filippo Brighina
OBJECTIVES: Fibromyalgia (FM) is a clinical syndrome characterised by widespread musculoskeletal pain, chronic fatigue, cognitive deficits, and sleep and mood disorders. The effectiveness of most pharmacological treatments is limited, and there is a need for new, effective and well-tolerated therapies. It has recently been shown that transcranial direct-current stimulation (tDCS) of the motor cortex reduces pain, and that tDCS of the dorso-lateral prefrontal cortex (DLPFC) improves anxiety, depression and cognitive impairment in FM patients...
May 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28665361/a-study-of-deep-cnn-based-classification-of-open-and-closed-eyes-using-a-visible-light-camera-sensor
#9
Ki Wan Kim, Hyung Gil Hong, Gi Pyo Nam, Kang Ryoung Park
The necessity for the classification of open and closed eyes is increasing in various fields, including analysis of eye fatigue in 3D TVs, analysis of the psychological states of test subjects, and eye status tracking-based driver drowsiness detection. Previous studies have used various methods to distinguish between open and closed eyes, such as classifiers based on the features obtained from image binarization, edge operators, or texture analysis. However, when it comes to eye images with different lighting conditions and resolutions, it can be difficult to find an optimal threshold for image binarization or optimal filters for edge and texture extraction...
June 30, 2017: Sensors
https://www.readbyqxmd.com/read/28659838/the-robust-running-ape-unraveling-the-deep-underpinnings-of-coordinated-human-running-proficiency
#10
REVIEW
John Kiely
In comparison to other mammals, humans are not especially strong, swift or supple. Nevertheless, despite these apparent physical limitations, we are among Natures most superbly well-adapted endurance runners. Paradoxically, however, notwithstanding this evolutionary-bestowed proficiency, running-related injuries, and Overuse syndromes in particular, are widely pervasive. The term 'coordination' is similarly ubiquitous within contemporary coaching, conditioning, and rehabilitation cultures. Various theoretical models of coordination exist within the academic literature...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28647831/alterations-in-regional-homogeneity-of-resting-state-brain-activity-in-fatigue-of-parkinson-s-disease
#11
Junyi Li, Yongsheng Yuan, Min Wang, Jiejin Zhang, Li Zhang, Siming Jiang, Jian Ding, Kezhong Zhang
Fatigue is a common complaint in patients with Parkinson's disease (PD). However, the neural bases of fatigue in PD remain uncertain. In this cross-sectional study, our aim was to study the change of the local brain function in PD patients with fatigue. Among 49 patients with PD, 17 of them had fatigue and the remaining 32 patients without fatigue, and 25 age- and gender-matched healthy controls were enrolled. All subjects were evaluated with Fatigue Severity Scale (FSS) and had a resting-state functional magnetic resonance imaging (rs-fMRI) scan...
June 24, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28638328/protocol-for-the-reconstructing-consciousness-and-cognition-reccognition-study
#12
Kaitlyn L Maier, Andrew R McKinstry-Wu, Ben Julian A Palanca, Vijay Tarnal, Stefanie Blain-Moraes, Mathias Basner, Michael S Avidan, George A Mashour, Max B Kelz
Important scientific and clinical questions persist about general anesthesia despite the ubiquitous clinical use of anesthetic drugs in humans since their discovery. For example, it is not known how the brain reconstitutes consciousness and cognition after the profound functional perturbation of the anesthetized state, nor has a specific pattern of functional recovery been characterized. To date, there has been a lack of detailed investigation into rates of recovery and the potential orderly return of attention, sensorimotor function, memory, reasoning and logic, abstract thinking, and processing speed...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28619425/using-endogenous-saccades-to-characterize-fatigue-in-multiple-sclerosis
#13
Marisa Ferreira, Paulo A Pereira, Marta Parreira, Inês Sousa, José Figueiredo, João J Cerqueira, Antonio F Macedo
PURPOSE: Multiple Sclerosis (MS) is likely to cause dysfunction of neural circuits between brain regions increasing brain working load or a subjective overestimation of such working load leading to fatigue symptoms. The aim of this study was to investigate if saccades can reveal the effect of fatigue in patients with MS. METHODS: Patients diagnosed with MS (EDSS<=3) and age matched controls were recruited. Eye movements were monitored using an infrared eyetracker...
May 2017: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/28611575/ica-derived-eeg-correlates-to-mental-fatigue-effort-and-workload-in-a-realistically-simulated-air-traffic-control-task
#14
Deepika Dasari, Guofa Shou, Lei Ding
Electroencephalograph (EEG) has been increasingly studied to identify distinct mental factors when persons perform cognitively demanding tasks. However, most of these studies examined EEG correlates at channel domain, which suffers the limitation that EEG signals are the mixture of multiple underlying neuronal sources due to the volume conduction effect. Moreover, few studies have been conducted in real-world tasks. To precisely probe EEG correlates with specific neural substrates to mental factors in real-world tasks, the present study examined EEG correlates to three mental factors, i...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28608135/can-proportional-ventilation-modes-facilitate-exercise-in-critically-ill-patients-a-physiological-cross-over-study-pressure-support-versus-proportional-ventilation-during-lower-limb-exercise-in-ventilated-critically-ill-patients
#15
Evangelia Akoumianaki, Nicolas Dousse, Aissam Lyazidi, Jean-Claude Lefebvre, Severine Graf, Ricardo Luiz Cordioli, Nathalie Rey, Jean-Christophe Marie Richard, Laurent Brochard
BACKGROUND: Early exercise of critically ill patients may have beneficial effects on muscle strength, mass and systemic inflammation. During pressure support ventilation (PSV), a mismatch between demand and assist could increase work of breathing and limit exercise. A better exercise tolerance is possible with a proportional mode of ventilation (Proportional Assist Ventilation, PAV+ and Neurally Adjusted Ventilatory Assist, NAVA). We examined whether, in critically ill patients, PSV and proportional ventilation have different effects on respiratory muscles unloading and work efficiency during exercise...
December 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/28595261/speech-processing-fatigue-in-children-auditory-event-related-potential-and-behavioral-measures
#16
Alexandra P Key, Samantha J Gustafson, Lindsey Rentmeester, Benjamin W Y Hornsby, Fred H Bess
Purpose: Fatigue related to speech processing is an understudied area that may have significant negative effects, especially in children who spend the majority of their school days listening to classroom instruction. Method: This study examined the feasibility of using auditory P300 responses and behavioral indices (lapses of attention and self-report) to measure fatigue resulting from sustained listening demands in 27 children (M = 9.28 years). Results: Consistent with predictions, increased lapses of attention, longer reaction times, reduced P300 amplitudes to infrequent target stimuli, and self-report of greater fatigue were observed after the completion of a series of demanding listening tasks compared with the baseline values...
June 7, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28592684/trajectory-curvature-in-saccade-sequences-spatiotopic-influences-vs-residual-motor-activity
#17
Geoffrey Mégardon, Casimir Johannes Hendrikus Ludwig, Petroc Sumner
When decisions drive saccadic eye movements, traces of the decision process can be inferred from the movement trajectories. For example, saccades can curve away from distractor stimuli, which was thought to reflect cortical inhibition biasing activity in the Superior Colliculus. Recent neurophysiological work does not support this theory, and two recent models have replaced top-down inhibition with lateral interactions in the Superior Colliculus or neural fatigue in the brainstem Saccadic Burst Generator. All current models operate in retinotopic coordinates and are based on single saccade paradigms...
June 7, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28587072/automatic-detection-of-driver-fatigue-using-driving-operation-information-for-transportation-safety
#18
Zuojin Li, Liukui Chen, Jun Peng, Ying Wu
Fatigued driving is a major cause of road accidents. For this reason, the method in this paper is based on the steering wheel angles (SWA) and yaw angles (YA) information under real driving conditions to detect drivers' fatigue levels. It analyzes the operation features of SWA and YA under different fatigue statuses, then calculates the approximate entropy (ApEn) features of a short sliding window on time series. Using the nonlinear feature construction theory of dynamic time series, with the fatigue features as input, designs a "2-6-6-3" multi-level back propagation (BP) Neural Networks classifier to realize the fatigue detection...
May 25, 2017: Sensors
https://www.readbyqxmd.com/read/28582903/magnetic-stimulation-at-acupoints-relieves-mental-fatigue-an-event-related-potential-p300-study
#19
Shuo Yang, Yanyun Qiao, Lei Wang, Pengru Hao
BACKGROUND: Mental fatigue caused by continuous cognitive tasks represents one of the most worrying modern health problems. Event Related Potential (ERP) P300 is thought to be associated with cognitive function. OBJECTIVE: This study aimed at characterizing the neural activity correlated with the attentional processes and exploring a novelty method which combine the magnetic stimulation and acupoint to relieve mental fatigue caused by continuous cognitive tasks...
July 20, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/28561175/-multiple-sclerosis-fatigue-its-neural-correlates-and-its-modulation-with-tdcs
#20
Samar S Ayache, Moussa A Chalah, Tania Kümpfel, Frank Padberg, Jean-Pascal Lefaucheur, Ulrich Palm
Multiple sclerosis (MS) is a chronic progressive and inflammatory disease of the central nervous system and causes high rates of non-traumatic disability in young adults. Fatigue is frequently reported by a major part of patients during the disease course and dramatically increases the burden of illness. Despite the high prevalence of fatigue and its enormous impact on quality of life, its pathophysiological mechanisms are still unclear. Its etiology is multifactorial and complex, and is usually classified into 'primary' fatigue resulting from the pathological brain changes versus 'secondary' fatigue following disease symptoms, sleep disturbances, mood disorders, and side effects of medication...
May 2017: Fortschritte der Neurologie-Psychiatrie
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