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https://www.readbyqxmd.com/read/28329117/muscle-activity-during-sleep-in-human-subjects-rats-and-mice-towards-translational-models-of-rem-sleep-without-atonia
#1
Alessandro Silvani, Raffaele Ferri, Viviana Lo Martire, Stefano Bastianini, Chiara Berteotti, Agnese Salvadè, Giuseppe Plazzi, Marco Zucconi, Luigi Ferini-Strambi, Claudio L Bassetti, Mauro Manconi, Giovanna Zoccoli
Study Objectives: rapid-eye-movement (REM) sleep without atonia (RSWA) is a marker of REM sleep behavior disorder (RBD) and is common in narcolepsy. Available techniques for electromyogram (EMG) analysis are species-specific, limiting translational research on RSWA. We developed an automated technique based on distributions of normalized EMG values (DNE) to overcome this limitation. With DNE, we tested whether the control of neck and tibialis anterior (TA) muscles during sleep in wild-type rats and mice validly models the control of submentalis (chin) and TA muscles in healthy humans...
February 22, 2017: Sleep
https://www.readbyqxmd.com/read/28326708/-evaluation-of-electromyogram-activity-and-masticatory-efficiency-in-edentulous-individuals-whose-maxillomandibular-horizontal-relationship-records-were-obtained-with-three-different-methods
#2
Liu Cuiling, Yang Liyuan, Zheng Zheng, Gao Xu
OBJECTIVE: This study was performed to investigate the electromyographic (EMG) activity of the masseter muscle and the anterior temporalis muscle, as well as the masticatory efficiency after insertion of the dentures in edentulous individuals whose maxillomandibular horizontal relationship records were obtained with three different methods. METHODS: Ten edentulous individuals were enrolled in this study. Three types of complete dentures for these 10 edentulous patients were made according to their different maxillomandibular horizontal relationship records...
October 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28326567/both-standing-and-postural-threat-decrease-achilles-tendon-reflex-inhibition-from-tendon-electrical-stimulation
#3
Brian C Horslen, J Timothy Inglis, Jean-Sébastien Blouin, Mark G Carpenter
Golgi tendon organ Ib reflexes are thought to contribute to standing balance control, but it is unknown if they are modulated when people are exposed to a postural threat. We used a novel application of tendon electrical stimulation (TStim) to elicit Ib inhibitory reflexes in the medial gastrocnemius, while actively engaged in upright standing balance, to examine a) how Ib reflexes to TStim are influenced by upright stance, and b) the effects of height-induced postural threat on Ib reflexes during standing...
March 22, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28326007/evaluation-of-the-cortical-silent-period-of-the-laryngeal-motor-cortex-in-healthy-individuals
#4
Mo Chen, Rebekah L S Summers, George S Goding, Sharyl Samargia, Christy L Ludlow, Cecília N Prudente, Teresa J Kimberley
Objective: This work aimed to evaluate the cortical silent period (cSP) of the laryngeal motor cortex (LMC) using the bilateral thyroarytenoid (TA) muscles with transcranial magnetic stimulation (TMS). Methods: In 11 healthy participants, fine-wire electromyography (EMG) was used to record bilateral TA muscle responses to single pulse TMS delivered to the LMC in both hemispheres. Peripheral responses to stimulation over the mastoid, where the vagus nerve exits the skull, were collected to verify the central origin of the cortical stimulation responses by comparing the latencies...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28325123/effect-of-stimulation-of-cold-receptors-with-menthol-on-emg-activity-of-quadriceps-muscle-during-low-load-contraction
#5
Tadayuki Tokunaga, Hitoshi Sugawara, Chigaya Tadano, Masuo Muro
PURPOSE: Facilitatory and inhibitory responses of spinal motor neurons are influenced by somatosensory input from the skin. The purpose of this study, employing electromyography, was to examine the neuromuscular changes that occur with menthol applied to the skin over the quadriceps muscle. METHODS: Forty-two healthy volunteers performed isometric knee extensions at 35% maximum voluntary contraction (MVC) in three groups (Adult Placebo, Adult Menthol, Older Adult Menthol)...
March 21, 2017: Somatosensory & Motor Research
https://www.readbyqxmd.com/read/28325029/noninvasive-eeg-correlates-of-overground-and-stair-walking
#6
Justin A Brantley, Trieu Phat Luu, Recep Ozdemir, Fangshi Zhu, Anna T Winslow, Helen Huang, Jose L Contreras-Vidal
Automated walking intention detection remains a challenge in lower-limb neuroprosthetic systems. Here, we assess the feasibility of extracting motor intent from scalp electroencephalography (EEG). First, we evaluated the corticomuscular coherence between central EEG electrodes (C1, Cz, C2) and muscles of the shank and thigh during walking on level ground and stairs. Second, we trained decoders to predict the linear envelope of the surface electromyogram (EMG). We observed significant EEG-led corticomuscular coupling between electrodes and sEMG (tibialis anterior) in the high delta (3-4 Hz) and low theta (4-5 Hz) frequency bands during level walking, indicating efferent signaling from the cortex to peripheral motor neurons...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324993/dynamic-knee-muscle-co-contraction-quantified-during-walking
#7
Annachiara Strazza, Alessandro Mengarelli, Valentina Agostini, Marco Knaflitz, Laura Burattini, Sandro Fioretti, Francesco Di Nardo
The purpose of the present study was the quantification of the co-activation patterns of the knee extensor and flexor muscles during walking at self-selected speed and cadence. To this aim, the Statistical Gait Analysis, a recent methodology providing a statistical characterization of gait, was performed on surface EMG signals from Vastus Lateralis (VL) and Medial Hamstrings (MH) in 14 healthy young adult subjects. Muscular co-contraction was assessed as the overlapping period between activation intervals of agonist and antagonist muscles...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324821/muscular-activity-and-torque-of-the-foot-dorsiflexor-muscles-during-decremental-isometric-test-a-cross-sectional-study
#8
Maria Ruiz-Muñoz, Manuel González-Sánchez, Jaime Martín-Martín, Antonio I Cuesta-Vargas
PURPOSE: To analyse the torque variation level that could be explained by the muscle activation (EMG) amplitude of the three major foot dorsiflexor muscles (tibialis anterior (TA), extensor digitorum longus (EDL), extensor hallucis longus (EHL)) during isometric foot dorsiflexion at different intensities. METHODS: In a cross-sectional study, forty-one subjects performed foot dorsiflexion at 100%, 75%, 50% and 25% of maximal voluntary contractions (MVC) with the hip and knee flexed 90° and the ankle in neutral position (90° between leg and foot)...
November 30, 2016: Foot
https://www.readbyqxmd.com/read/28323348/differences-in-flexor-and-extensor-activity-during-locomotor-related-leg-movements-in-chick-embryos
#9
Soo Yeon Sun, Nina S Bradley
Prior to hatching, chick embryos spontaneously produce repetitive limb movements (RLMs), a developmental precursor to walking. During RLMs, flexor and extensor muscles are alternately active as during stance and swing phases of gait. However, previous studies of RLMs observed that flexor muscles were rhythmically active for many cycles, whereas extensors often failed to be recruited. Thus, we asked if flexor muscles are preferentially recruited during RLMs in chick embryos 1 day before hatching and onset of walking...
April 2017: Developmental Psychobiology
https://www.readbyqxmd.com/read/28320889/trunk-muscle-activation-during-movement-with-a-new-exercise-device-for-lumbo-pelvic-reconditioning
#10
Tobias Weber, Dorothée Debuse, Sauro E Salomoni, Edith L Elgueta Cancino, Enrico De Martino, Nick Caplan, Volker Damann, Jonathan Scott, Paul W Hodges
Gravitational unloading leads to adaptations of the human body, including the spine and its adjacent structures, making it more vulnerable to injury and pain. The Functional Re-adaptive Exercise Device (FRED) has been developed to activate the deep spinal muscles, lumbar multifidus (LM) and transversus abdominis (TrA), that provide inter-segmental control and spinal protection. The FRED provides an unstable base of support and combines weight bearing in up-right posture with side alternating, elliptical leg movements, without any resistance to movement...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28320673/imu-based-wrist-rotation-control-of-a-transradial-myoelectric-prosthesis
#11
Daniel A Bennett, Michael Goldfarb
This paper describes a control method intended to fa-cilitate improved control of a myoelectric prosthesis containing a wrist rotator. Rather than exclusively utilize electromyogram (EMG) for the control of all myoelectric components (e.g., a hand and a wrist), the proposed controller utilizes inertial measurement (from 6-axis inertial measurement unit, or IMU) to sense upper arm ab/adduction, and uses this input to command a wrist rotation velocity. As such, the controller essentially substitutes shoulder ab/adduction in place of agonist/antagonist EMG to control wrist angular velocity, which preserves EMG for control of the hand (or other arm components)...
March 15, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28320672/spatial-analysis-of-multichannel-surface-emg-in-hemiplegic-stroke
#12
Ghulam Rasool, Babak Afsharipour, Nina Suresh, William Z Rymer
We investigated spatial activation patterns of upper extremity muscles during isometric force generation in both intact persons and in hemispheric stroke survivors. We used a 128-channel surface electromyogram (EMG) grid to record the electrical activity of biceps brachii muscles during these contractions. EMG data were processed to develop 2-dimensional root mean square (RMS) maps of muscle activity. Our objective was to determine whether motor impairments following stroke were associated with changes in the muscle activity maps and in the spatial distribution of muscular activation...
March 15, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28320506/unexpected-walking-perturbations-reliability-and-validity-of-a-new-treadmill-protocol-to-provoke-muscular-reflex-activities-at-lower-extremities-and-the-trunk
#13
Tilman Engel, Juliane Mueller, Stephan Kopinski, Antje Reschke, Steffen Mueller, Frank Mayer
Instrumented treadmills offer the potential to generate standardized walking perturbations, which are particularly rapid and powerful. However, technical requirements to release adequate perturbations regarding timing, duration and amplitude are demanding. This study investigated the test-retest reliability and validity of a new treadmill perturbation protocol releasing rapid and unexpected belt perturbations to provoke muscular reflex responses at lower extremities and the trunk. Fourteen healthy participants underwent two identical treadmill walking protocols, consisting of 10 superimposed one-sided belt perturbations (100ms duration; 2m/s amplitude), triggered by a plantar pressure insole 200ms after heel contact...
March 4, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28319191/overt-orienting-of-spatial-attention-and-corticospinal-excitability-during-action-observation-are-unrelated
#14
Sonia Betti, Umberto Castiello, Silvia Guerra, Luisa Sartori
Observing moving body parts can automatically activate topographically corresponding motor representations in the primary motor cortex (M1), the so-called direct matching. Novel neurophysiological findings from social contexts are nonetheless proving that this process is not automatic as previously thought. The motor system can flexibly shift from imitative to incongruent motor preparation, when requested by a social gesture. In the present study we aim to bring an increase in the literature by assessing whether and how diverting overt spatial attention might affect motor preparation in contexts requiring interactive responses from the onlooker...
2017: PloS One
https://www.readbyqxmd.com/read/28319133/effects-of-sudden-walking-perturbations-on-neuromuscular-reflex-activity-and-three-dimensional-motion-of-the-trunk-in-healthy-controls-and-back-pain-symptomatic-subjects
#15
Juliane Mueller, Tilman Engel, Steffen Mueller, Josefine Stoll, Heiner Baur, Frank Mayer
BACKGROUND: Back pain patients (BPP) show delayed muscle onset, increased co-contractions, and variability as response to quasi-static sudden trunk loading in comparison to healthy controls (H). However, it is unclear whether these results can validly be transferred to suddenly applied walking perturbations, an automated but more functional and complex movement pattern. There is an evident need to develop research-based strategies for the rehabilitation of back pain. Therefore, the investigation of differences in trunk stability between H and BPP in functional movements is of primary interest in order to define suitable intervention regimes...
2017: PloS One
https://www.readbyqxmd.com/read/28318780/surface-electromyogram-and-muscle-ultrasonography-for-detection-of-muscle-fasciculations-in-pediatric-peripheral-neuropathy
#16
Masayoshi Oguri, Yoshiaki Saito, Tetsuya Okazaki, Wataru Matsumura, Koyo Ohno, Masami Togawa, Chisako Fukuda, Yuko Saito, Ichizo Nishino, Yoshihiro Maegaki
A 12-year-old girl presented with talipes equinus of both legs, attenuation of upper and lower limb tendon reflexes, thermal hyperalgesia, and reduction of vibratory sensation. On clinical examination, muscle twitches of fingers of both hands, as well as the abductor halluces and the dorsal interossei muscles of the right foot were observed. Nerve conduction velocity was significantly declined in the upper and lower extremities. Needle electromyography (EMG) was not performed; however, ultrasonography revealed repetitive, semi-regular muscle twitches lasting 0...
March 16, 2017: Brain & Development
https://www.readbyqxmd.com/read/28316588/alterations-of-muscle-activation-pattern-in-stroke-survivors-during-obstacle-crossing
#17
Chenming Ma, Na Chen, Yurong Mao, Dongfeng Huang, Rong Song, Le Li
OBJECTIVE: This study investigates changes in the neuromuscular activation pattern of the lower limb muscles in stroke survivors when crossing obstacles of three different heights. METHODS: Eight stroke survivors and eight age-, height-, and gender-matched healthy controls were recruited and instructed to cross over obstacles with heights of 10, 20, and 30% leg length. Surface electromyography (EMG) signals were recorded from the rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA), and medial gastrocnemius (MG) of both limbs...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28316262/tribute-to-dr-jacques-rogge-muscle-activity-and-fatigue-during-hiking-in-olympic-dinghy-sailing
#18
Jan G Bourgois, Jasmien Dumortier, Margot Callewaert, Bert Celie, Carlo Capelli, Gisela Sjøgaard, Dirk De Clercq, Jan Boone
'A tribute to Dr J. Rogge' aims to systematically review muscle activity and muscle fatigue during sustained submaximal quasi-isometric knee extension exercise (hiking) related to Olympic dinghy sailing as a tribute to Dr Rogge's merits in the world of sports. Dr Jacques Rogge is not only the former President of the International Olympic Committee, he was also an orthopaedic surgeon and a keen sailor, competing at three Olympic Games. In 1972, in fulfilment of the requirements for the degree of Master in Sports Medicine, he was the first who studied a sailors' muscle activity by means of invasive needle electromyography (EMG) during a specific sailing technique (hiking) on a self-constructed sailing ergometer...
March 19, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28315585/eye-movement-during-recall-reduces-objective-memory-performance-an-extended-replication
#19
Arne Leer, Iris M Engelhard, Bert Lenaert, Dieter Struyf, Bram Vervliet, Dirk Hermans
Eye Movement Desensitization and Reprocessing (EMDR) therapy for posttraumatic stress disorder involves making eye movements (EMs) during recall of a traumatic image. Experimental studies have shown that the dual task decreases self-reported memory vividness and emotionality. However valuable, these data are prone to demand effects and little can be inferred about the mechanism(s) underlying the observed effects. The current research aimed to fill this lacuna by providing two objective tests of memory performance...
March 9, 2017: Behaviour Research and Therapy
https://www.readbyqxmd.com/read/28314942/empathy-einf%C3%A3-hlung-and-aesthetic-experience-the-effect-of-emotion-contagion-on-appreciation-of-representational-and-abstract-art-using-femg-and-scr
#20
Gerger Gernot, Matthew Pelowski, Helmut Leder
Since the advent of the concept of empathy in the scientific literature, it has been hypothesized, although not necessarily empirically verified, that empathic processes are essential to aesthetic experiences of visual art. We tested how the ability to "feel into" ("Einfühlung") emotional content-a central aspect of art empathy theories-affects the bodily responses to and the subjective judgments of representational and abstract paintings. The ability to feel into was measured by a standardized pre-survey on "emotional contagion"-the ability to pick up and mirror, or in short to "feel into", emotions, which often overlaps with higher general or interpersonal empathetic abilities...
March 17, 2017: Cognitive Processing
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