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Electromyogram and EMG

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https://www.readbyqxmd.com/read/30307933/partial-homologies-between-sleep-states-in-lizards-mammals-and-birds-suggest-a-complex-evolution-of-sleep-states-in-amniotes
#1
Paul-Antoine Libourel, Baptiste Barrillot, Sébastien Arthaud, Bertrand Massot, Anne-Laure Morel, Olivier Beuf, Anthony Herrel, Pierre-Hervé Luppi
It is crucial to determine whether rapid eye movement (REM) sleep and slow-wave sleep (SWS) (or non-REM sleep), identified in most mammals and birds, also exist in lizards, as they share a common ancestor with these groups. Recently, a study in the bearded dragon (P. vitticeps) reported states analogous to REM and SWS alternating in a surprisingly regular 80-s period, suggesting a common origin of the two sleep states across amniotes. We first confirmed these results in the bearded dragon with deep brain recordings and electro-oculogram (EOG) recordings...
October 2018: PLoS Biology
https://www.readbyqxmd.com/read/30301550/does-the-activity-of-ankle-plantar-flexors-differ-between-limbs-while-healthy-young-subjects-stand-at-ease
#2
Fabio V Dos Anjos, Marco Gazzoni, Taian M Vieira
Inferences on the active contribution of plantar flexors to the stabilisation of human standing posture have been drawn from surface electromyograms (EMGs). Surface EMGs were however often detected unilaterally, presuming the myoelectric activity from muscles in a single leg reflects the pattern of muscle activation in both legs. In this study we question whether surface EMGs detected from plantar flexor muscles in both legs provide equal estimates of the duration of activity. Arrays of surface electrodes were used to collect EMGs from gastrocnemius and soleus muscles while twelve, young male participants stood at ease for 60 s...
September 21, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/30299169/mir-155-deletion-modulates-lipopolysaccharide-induced-sleep-in-female-mice
#3
Surbhi, Jeremy C Borniger, Kathryn L G Russart, Ning Zhang, Ulysses J Magalang, Randy J Nelson
Immune signaling is known to regulate sleep. miR-155 is a microRNA that regulates immune responses. We hypothesized that miR-155 would alter sleep regulation. Thus, we investigated the potential effects of miR-155 deletion on sleep-wake behavior in adult female homozygous miR-155 knockout (miR-155KO ) mice and littermate controls (WT). Mice were implanted with biotelemetry units and EEG/EMG biopotentials were recorded continuously for three baseline days. miR-155KO mice had decreased bouts of NREM and REM sleep compared with WT mice, but no differences were observed in the length of sleep bouts or total time spent in sleep-wake states...
October 9, 2018: Chronobiology International
https://www.readbyqxmd.com/read/30279983/features-based-on-variational-mode-decomposition-for-identification-of-neuromuscular-disorder-using-emg-signals
#4
Sukumar Nagineni, Sachin Taran, Varun Bajaj
Neuromuscular disorder is a muscular and nervous disorder resulting in muscular weakness and progressively damages nervous control, such as amyotrophic lateral sclerosis (ALS) and myopathy (MYO). Its diagnosis can be possible by classification of ALS, MYO, and normal electromyogram (EMG) signals. In this paper, an effective method based on variational mode decomposition (VMD) is proposed for identification of neuromuscular disorder of EMG signals. VMD is an adaptive signal decomposition which decomposes EMG signals nonrecursively into band-limited functions or modes...
December 2018: Health Information Science and Systems
https://www.readbyqxmd.com/read/30278302/differences-in-muscular-and-perceptual-responses-to-a-neck-shoulder-fatiguing-task-between-women-and-men
#5
Annamaria Otto, Kim Emery, Julie N Côté
Fatigue is a risk factor for the development of work-related musculoskeletal disorders (WMSDs) of the neck/shoulder, and exertion is a state that connects the sensory/affective and physical aspects of fatigue. Relationships between ratings of perceived exertion (RPE) and electromyogram (EMG) signal characteristics have been identified. However, the sex-specific effects on these relationships are unclear and could be affected by personal factors such as skinfold thickness. 28 healthy young adults completed a fatiguing task with the arm held at shoulder height...
September 25, 2018: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/30278246/effect-of-5-ht-2a-receptor-antagonist-ketanserin-on-micturition-in-male-rats
#6
Xiaohu Wang, Nailong Cao, Jianshu Ni, Jiemin Si, Baojun Gu, Andersson Karl-Erik
OBJECTIVES: This study aimed to investigate the effects of ketanserin on micturition mediated via the 5-HT2A receptor in the motoneuron nucleus of the Lumbosacral cord, as reflected in high frequency oscillations (HFOs) of intravesical pressure and the external urethral sphincter electromyogram (EUS-EMG) in anesthetized male rats. METHODS:: Male Sprague-Dawley rats were used. Cystometry and EUS-EMG were performed in all rats under urethane anesthesia to examine the variations after successive intrathecal (i...
September 29, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/30273975/experimental-study-of-needle-recording-electrodes-placed-on-the-thyroid-cartilage-for-neuromonitoring-during-thyroid-surgery
#7
Y Zhao, C Li, D Zhang, L Zhou, X Liu, S Li, T Wang, G Dionigi, H Sun
BACKGROUND: Needle electrodes placed on the thyroid cartilage (TC) are an alternative to endotracheal tube (ET) electrodes for assessing recurrent laryngeal nerve (RLN) function during thyroid surgery. Needle electrodes placed on the TC were evaluated in an experimental porcine model. METHODS: Continuous intraoperative neuromonitoring was used to record the electromyogram. Each TC side was delineated into nine areas to determine the optimal placement of the electrode, and needle electrode area, depth and orientation for optimal electromyographic (EMG) amplitudes were evaluated...
October 1, 2018: British Journal of Surgery
https://www.readbyqxmd.com/read/30242475/a-new-rocuronium-formulation-not-causing-vascular-pain-in-a-flexor-reflex-model-of-anesthetized-rats
#8
Keisuke Jimbo, Yutaka Itsuji, Erika Kubo, Masamichi Kumagai, Kuniharu Masui, Yoshiro Yamamura
PURPOSE: Intravenous administration of the brand formulation of rocuronium bromide, currently used as a muscle relaxant, has been associated with vascular pain accompanied by withdrawal movements of the arm and wrist. The purpose of this study was to identify the cause of vascular pain induced by the brand formulation and to develop a new rocuronium formulation, not causing vascular pain, using a vascular pain-evoked flexor reflex response model of anesthetized rats. METHODS: A rat flexor reflex model, monitored by electromyography, was used to evaluate a flexor reflex response as the index of vascular pain...
September 21, 2018: Journal of Anesthesia
https://www.readbyqxmd.com/read/30237487/recovering-motor-activation-with-chronic-peripheral-nerve-computer-interface
#9
Thomas E Eggers, Yazan M Dweiri, Grant A McCallum, Dominique M Durand
Interfaces with the peripheral nerve provide the ability to extract motor activation and restore sensation to amputee patients. The ability to chronically extract motor activations from the peripheral nervous system remains an unsolved problem. In this study, chronic recordings with the Flat Interface Nerve Electrode (FINE) are employed to recover the activation levels of innervated muscles. The FINEs were implanted on the sciatic nerves of canines, and neural recordings were obtained as the animal walked on a treadmill...
September 20, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30236045/diaphragm-muscle-function-following-mid-cervical-contusion-injury-in-rats
#10
Obaid U Khurram, Matthew J Fogarty, Sabhya Rana, Pangdra Vang, Gary C Sieck, Carlos B Mantilla
Mid-cervical spinal cord contusion injury results in tissue damage, disruption of spinal pathways, and motor neuron loss. Unilateral C4 contusion results in loss of 40-50% of phrenic motor neurons ipsilateral to the injury (~25% of the total phrenic motor neuron pool). Over time after unilateral C4 contusion injury, diaphragm muscle (DIAm) electromyogram (EMG) activity increases both contralateral and ipsilateral to the side of injury in rats, suggesting compensation due to increased activation of the surviving motor neurons...
September 20, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/30231918/the-effect-of-neuroligin-2-absence-on-sleep-architecture-and-electroencephalographic-activity-in-mice
#11
Bong Soo Seok, Erika Bélanger-Nelson, Chloé Provost, Steve Gibbs, Valérie Mongrain
Sleep disorders are comorbid with most psychiatric disorders, but the link between these is not well understood. Neuroligin-2 (NLGN2) is a cell adhesion molecule that plays roles in synapse formation and neurotransmission. Moreover, NLGN2 has been associated with psychiatric disorders, but its implication in sleep remains underexplored. In the present study, the effect of Nlgn2 knockout (Nlgn2-/- ) on sleep architecture and electroencephalographic (EEG) activity in mice has been investigated. The EEG and electromyogram (EMG) were recorded in Nlgn2-/- mice and littermates for 24 h from which three vigilance states (i...
September 19, 2018: Molecular Brain
https://www.readbyqxmd.com/read/30226437/lift-speed-moderates-the-effects-of-muscle-activity-on-perceived-heaviness
#12
Morgan L Waddell, Eric L Amazeen
Research has shown that perceived heaviness is a function of the ratio of muscle activity (measured by electromyogram [EMG]) to the resulting acceleration of the object. However, objects will commonly be lifted at different speeds, implying variation in both EMG and acceleration. This study examined the effects of lifting speed by having participants report perceived heaviness for objects lifted by elbow flexion at three different speeds: slow, preferred, and fast. EMG and angular acceleration were recorded during these lifts...
October 2018: Quarterly Journal of Experimental Psychology: QJEP
https://www.readbyqxmd.com/read/30218767/fatigue-induced-decline-in-low-frequency-common-input-to-bilateral-and-unilateral-plantar-flexors-during-quiet-standing
#13
Tatsunori Watanabe, Kotaro Saito, Kazuto Ishida, Shigeo Tanabe, Ippei Nojima
Plantar flexor muscles play a crucial role in maintaining balance during quiet standing. The purpose of this study was to investigate the effect of their fatigue on common input to these muscles, using a coherence analysis. Thirteen healthy young male adults stood quietly before and after a fatigue protocol consisting of a heel raise exercise. Center of pressure (COP) displacement and electromyograms (EMGs) from the bilateral medial gastrocnemius and soleus muscles were recorded. EMG-EMG coherences between the bilateral homologous muscles (bilateral coherence) and within the unilateral muscles (unilateral coherence) in the right leg were calculated...
September 12, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/30215813/temporal-dynamics-of-the-transition-period-between-nonrapid-eye-movement-and-rapid-eye-movement-sleep-in-the-rat
#14
Alvaro Sánchez-López, Manuel Silva-Pérez, Miguel Escudero
Study Objectives: We studied the sequence of events that occur in electroencephalogram (EEG), electromyogram (EMG), and ocular activities along the transition period between nonrapid eye movement and rapid eye movement (REM) sleep and their temporal relationships. Methods: Twenty adult Wistar rats underwent polygraphic recordings of EEG, EMG, and eye movements during the transition periods. The studied EEG variables included the time of occurrence of the last sleep spindle and the evolution of the amplitudes of δ (1-5 Hz), θ (6-9 Hz), and high-frequency (110-160 Hz) oscillations (HFO)...
September 1, 2018: Sleep
https://www.readbyqxmd.com/read/30179163/reduced-muscle-fatigue-using-kilohertz-frequency-subthreshold-stimulation-of-the-proximal-nerve
#15
Yang Zheng, Xiaogang Hu
OBJECTIVE: Conventional electrical stimulation techniques targeting the motor points often induce early muscle fatigue onset that can limit clinical applications. In our current study, we evaluated the muscle activation and force generation during fatigue using a novel stimulation technique. APPROACH: Clustered subthreshold 80 μs current pulses at 10 kHz (high-frequency mode, HF) were delivered transcutaneously to activate the median and ulnar nerve bundles and induce dispersed activations of motor units...
September 4, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/30176006/a-high-performance-liquid-chromatography-measurement-of-kynurenine-and-kynurenic-acid-relating-biochemistry-to-cognition-and-sleep-in-rats
#16
Annalisa M Baratta, Shaun S Viechweg, Jessica A Mong, Ana Pocivavsek
The kynurenine pathway (KP) of tryptophan degradation has been implicated in psychiatric disorders. Specifically, the astrocyte-derived metabolite kynurenic acid (KYNA), an antagonist at both N-methyl-d-aspartate (NMDA) and α7 nicotinic acetylcholine (α7nACh) receptors, has been implicated in cognitive processes in health and disease. As KYNA levels are elevated in the brains of patients with schizophrenia, a malfunction at the glutamatergic and cholinergic receptors is believed to be causally related to cognitive dysfunction, a core domain of the psychopathology of the illness...
August 19, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/30175570/-on-nerve-conduction-studies-and-electromyogram-in-the-community
#17
Menachem Sadeh
Nerve conduction studies (NCS) and electromyograms (EMG) constitute an expansion of the neurological examination and help to reach the diagnosis or localize the pathological process. Planning the electrophysiological study and drawing conclusions depend on the skills of the examiner, his experience and the time available for the study. The studies carried out within the framework of the community are carried out in part by skilled physicians, but the time and conditions at their disposal do not enable the proper performance of the studies...
August 2018: Harefuah
https://www.readbyqxmd.com/read/30152548/innervation-asymmetry-of-the-external-anal-sphincter-in-aging-characterized-from-high-density-intra-rectal-surface-emg-recordings
#18
Nicholas Dias, Xuhong Li, Chuan Zhang, Yingchun Zhang
AIMS: The innervation zone asymmetry of the external anal sphincter (EAS) has been investigated as a risk factor for the development of fecal incontinence (FI). This study aims to utilize an intra-rectal high-density surface electromyogram (HD-sEMG) recording and advanced HD-sEMG decomposition technique to characterize the effects of aging on the asymmetry of EAS functional innervation. METHODS: HD-sEMG signals were recorded intra-rectally from six healthy young and seven healthy elderly women during voluntary contractions of the EAS...
August 28, 2018: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/30150485/delayed-fatigue-in-finger-flexion-forces-through-transcutaneous-nerve-stimulation
#19
Henry Shin, Ryan Chen, Xiaogang Hu
Weakness of the hand is a major impairment which limits independent living. Neuromuscular electrical stimulation (NMES) is a common approach to help restore muscle strength. Traditional NMES directly over the muscle often leads to a rapid onset of muscle fatigue. In this study, we investigated the force sustainability of finger flexor muscles using a transcutaneous nerve stimulation approach.
 Approach: Finger flexion forces and high-density electromyogram (HD EMG) signals were obtained while electrical stimulation was applied to the ulnar and median nerve bundles through a stimulation grid on the proximal arm segment...
August 28, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/30131672/estimation-of-time-varying-coherence-amongst-synergistic-muscles-during-wrist-movements
#20
Guiting Hu, Wenjuan Yang, Xiaoling Chen, Wenjing Qi, Xinxin Li, Yihao Du, Ping Xie
The central nervous system (CNS) controls the limb movement by modulating multiple skeletal muscles with synergistic modules and neural oscillations with different frequencies between the activated muscles. Several researchers have found intermuscular coherence existing within the synergistic muscle pairs, and pointed out that the intermuscular synchronization existed when functional forces were generated. However, few studies involved the time-varying characteristics of the intermuscular coherence in each synergy module though all activated muscles keep in a dynamic and varying process...
2018: Frontiers in Neuroscience
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