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Electrical muscle stimulation

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https://www.readbyqxmd.com/read/29349480/posture-modulates-the-sensitivity-of-the-h-reflex
#1
Serpil Cecen, Imran Khan Niazi, Rasmus Wiberg Nedergaard, Alice Cade, Kathryn Allen, Kelly Holt, Heidi Haavik, Kemal S Türker
The effect of body posture on the human soleus H-reflex via electrical stimulation of the tibial nerve at the popliteal fossa was studied. All parameters that may influence the reflex were controlled stringently. H-reflexes were elicited in three different body postures while keeping the level of background muscle activation to a minimum. The H-reflex curve relative to the M-wave curve did not change significantly in any of the body postures. However, the maximal H-reflex amplitude significantly increased in the prone position compared with the sitting (p = 0...
January 18, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29344780/intraoperative-monitoring-of-z-l-response-zlr-and-abnormal-muscle-response-amr-during-microvascular-decompression-for-hemifacial-spasm-interpreting-the-role-of-zlr
#2
Byung-Chul Son, Hak-Cheol Ko, Jin-Gyu Choi
BACKGROUND: Z-L response (ZLR) has been suggested to a new electromyographic (EMG) potential recorded from the facial muscle of patient with hemifacial spasm (HFS) during microvascular decompression (MVD). Although ZLR has been suggested to be useful, experience of ZLR monitoring is limited and its significance during MVD is still unclear. METHODS: To investigate the significance of ZLR, both ZLR and abnormal muscle response (AMR) were simultaneously recorded before and after decompression of root exit zone (REZ) in 20 consecutive patients with HFS...
January 17, 2018: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29335865/beneficial-effect-of-berberis-amurensis-rupr-on-penile-erection
#3
Rui Tan, Yun Jung Lee, Kyung Woo Cho, Dae Gill Kang, Ho Sub Lee
OBJECTIVE: To investigate whether the methanol extract of Berberis amurensis Rupr. (BAR) augments penile erection using in vitro and in vivo experiments. METHODS: The ex vivo study used corpus cavernosum strips prepared from adult male New Zealand White rabbits. In in vivo studies for intracavernous pressure (ICP), blood pressure, mean arterial pressure (MAP), and increase of peak ICP were continuously monitored during electrical stimulation of Sprague-Dawley rats...
January 15, 2018: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/29335666/a-modified-dynamic-surface-controller-for-delayed-neuromuscular-electrical-stimulation
#4
Naji Alibeji, Nicholas Kirsch, Brad E Dicianno, Nitin Sharma
A widely accepted model of muscle force generation during neuromuscular electrical stimulation (NMES) is a second-order nonlinear musculoskeletal dynamics cascaded to a delayed first-order muscle activation dynamics. However, most nonlinear NMES control methods have either neglected the muscle activation dynamics or used an ad hoc strategies to tackle the muscle activation dynamics, which may not guarantee control stability. We hypothesized that a nonlinear control design that includes muscle activation dynamics can improve the control performance...
August 2017: IEEE/ASME Transactions on Mechatronics
https://www.readbyqxmd.com/read/29333223/development-of-practical-functional-electrical-stimulation-cycling-systems-based-on-an-electromyography-study-of-the-cybathlon-2016
#5
Jetsada Arnin, Traisak Yamsa-Ard, Preechapawan Triponyuwasin, Yodchanan Wongsawat
The purpose of this study was to develop a functional electrical stimulation (FES) system based on the motor driving concept for use by spinal cord injury patients participating in the FES Cycling competition at the Cybathlon 2016. The proposed FES system consists of a low-power control system, a precise processor unit, and a 4-channel stimulation unit. Self-adhesive carbon conductive electrodes were utilized for stimulation. A 26-year-old SCI patient was qualified to participate in the competition. The pilot patient underwent training for 16 months, which included experience with FES stimulation, performing FES cycling, and reducing spasticity, to practice using the FES system...
December 5, 2017: European Journal of Translational Myology
https://www.readbyqxmd.com/read/29325145/anxiety-dependent-modulation-of-motor-responses-to-pain-expectancy
#6
Carlotta Fossataro, Giulia Bucchioni, Federico D'Agata, Valentina Bruno, Rosalba Morese, Pierre Krystkowiak, Francesca Garbarini
The relationship between pain expectancy and motor system plays a crucial role in the human defensive system. Here, we took advantage of the inhibitory modulation of the motor pathway to the muscle of the hand receiving painful stimuli, by recording motor-evoked potentials (MEPs) to Transcranial Magnetic Stimulation (TMS). We employed a classical conditioning paradigm in which neutral (visual and auditory) stimuli were conditioned by pairing either painful or not-painful stimuli (electric shocks) in separated groups...
January 8, 2018: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/29324829/electrode-placement-on-the-forearm-for-selective-stimulation-of-finger-extension-flexion
#7
Xueliang Bao, Yuxuan Zhou, Yunlong Wang, Jianjun Zhang, Xiaoying Lü, Zhigong Wang
It is still challenging to achieve a complex grasp or fine finger control by using surface functional electrical stimulation (FES), which usually requires a precise electrode configuration under laboratory or clinical settings. The goals of this study are as follows: 1) to study the possibility of selectively activating individual fingers; 2) to investigate whether the current activation threshold and selective range of individual fingers are affected by two factors: changes in the electrode position and forearm rotation (pronation, neutral and supination); and 3) to explore a theoretical model for guidance of the electrode placement used for selective activation of individual fingers...
2018: PloS One
https://www.readbyqxmd.com/read/29323433/electrically-driven-microengineered-bioinspired-soft-robots
#8
Su Ryon Shin, Bianca Migliori, Beatrice Miccoli, Yi-Chen Li, Pooria Mostafalu, Jungmok Seo, Serena Mandla, Alessandro Enrico, Silvia Antona, Ram Sabarish, Ting Zheng, Lorenzo Pirrami, Kaizhen Zhang, Yu Shrike Zhang, Kai-Tak Wan, Danilo Demarchi, Mehmet R Dokmeci, Ali Khademhosseini
To create life-like movements, living muscle actuator technologies have borrowed inspiration from biomimetic concepts in developing bioinspired robots. Here, the development of a bioinspired soft robotics system, with integrated self-actuating cardiac muscles on a hierarchically structured scaffold with flexible gold microelectrodes is reported. Inspired by the movement of living organisms, a batoid-fish-shaped substrate is designed and reported, which is composed of two micropatterned hydrogel layers. The first layer is a poly(ethylene glycol) hydrogel substrate, which provides a mechanically stable structure for the robot, followed by a layer of gelatin methacryloyl embedded with carbon nanotubes, which serves as a cell culture substrate, to create the actuation component for the soft body robot...
January 11, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29319007/calpain-inhibition-improves-erectile-function-in-diabetic-mice-via-upregulating-endothelial-nitric-oxide-synthase-expression-and-reducing-apoptosis
#9
Hao Li, Li-Ping Chen, Tao Wang, Shao-Gang Wang, Ji-Hong Liu
Calpain activation contributes to hyperglycemia-induced endothelial dysfunction and apoptosis. This study was designed to investigate the role of calpain inhibition in improving diabetic erectile dysfunction (ED) in mice. Thirty-eight-week-old male C57BL/6J mice were divided into three groups: (1) nondiabetic control group, (2) diabetic mice + vehicle group, and (3) diabetic mice + MDL28170 (an inhibitor of calpain) group. Type 1 diabetes was induced by intraperitoneal injection of streptozotocin at 60 mg kg-1 body weight for 5 consecutive days...
January 9, 2018: Asian Journal of Andrology
https://www.readbyqxmd.com/read/29317646/engineering-human-pluripotent-stem-cells-into-a-functional-skeletal-muscle-tissue
#10
Lingjun Rao, Ying Qian, Alastair Khodabukus, Thomas Ribar, Nenad Bursac
The generation of functional skeletal muscle tissues from human pluripotent stem cells (hPSCs) has not been reported. Here, we derive induced myogenic progenitor cells (iMPCs) via transient overexpression of Pax7 in paraxial mesoderm cells differentiated from hPSCs. In 2D culture, iMPCs readily differentiate into spontaneously contracting multinucleated myotubes and a pool of satellite-like cells endogenously expressing Pax7. Under optimized 3D culture conditions, iMPCs derived from multiple hPSC lines reproducibly form functional skeletal muscle tissues (iSKM bundles) containing aligned multi-nucleated myotubes that exhibit positive force-frequency relationship and robust calcium transients in response to electrical or acetylcholine stimulation...
January 9, 2018: Nature Communications
https://www.readbyqxmd.com/read/29314717/effects-of-streptomycin-administration-on-increases-in-skeletal-muscle-fiber-permeability-and-size-following-eccentric-muscle-contractions
#11
Keishi Hayao, Hiroyuki Tamaki, Kouki Nakagawa, Keigo Tamakoshi, Hideaki Takahashi, Kengo Yotani, Futoshi Ogita, Noriaki Yamamoto, Hideaki Onishi
The purpose of this study was to investigate the preventive effect of streptomycin administration on changes in membrane permeability and the histomorphological characteristics of damaged muscle fibers following eccentric contraction (ECC). Eighteen 7-wk-old male Fischer 344 rats were randomly assigned to three groups: control (Cont), ECC, and ECC with streptomycin (ECC+Str). The tibialis anterior (TA) muscles in both ECC groups were stimulated electrically and exhibited ECC. Evans blue dye (EBD), a marker of muscle fiber damage associated with increased membrane permeability, was injected 24 h before TA muscle sampling...
January 3, 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29308952/efficiency-of-neuromuscular-electrical-stimulation-a-comparison-of-elicited-force-and-subject-tolerance-using-three-electrical-waveforms
#12
James W Bellew, Molly Allen, Austin Biefnes, Sara Grantham, James Miglin, Dylan Swartzell
OBJECTIVE: Efficacy of neuromuscular electrical stimulation (NMES) is limited by the discomfort of electrically elicited contractions. Most studies of tolerance to NMES have examined stimulation to maximal tolerance. NMES efficiency is the amount of elicited force at a specific level of tolerance. This study is the first to describe and examine such. DESIGN: A repeated measures design was used. Electrically elicited force (EEF) was measured using three waveforms: burst-modulated alternating current (BMAC), pulsed current (PC), and burst-modulated pulsed current (BMPC)...
January 8, 2018: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/29305235/validation-of-isometric-tetanic-force-as-a-measure-of-muscle-recovery-after-nerve-injury-in-the-rabbit-biceps
#13
Kathleen M Kollitz, Guilherme Giusti, Patricia F Friedrich, Allen T Bishop, Alexander Y Shin
PURPOSE: The purpose of this study was to describe and validate a technique for measurement of isometric tetanic force (ITF) in the rabbit biceps muscle. MATERIALS AND METHODS: Eighteen New Zealand White rabbits were randomized to test either the right side or the left side first. Under propofol anesthesia, the brachial plexus and biceps brachii were exposed. The middle trunk (C6, C7) was secured in a bipolar electrode. Compound muscle action potential (CMAP) was measured...
January 3, 2018: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29304102/activation-of-biceps-femoris-long-head-reduces-tibiofemoral-anterior-shear-force-and-tibial-internal-rotation-torque-in-healthy-subjects
#14
Nur Liyana Azmi, Ziyun Ding, Rui Xu, Anthony M J Bull
The anterior cruciate ligament (ACL) provides resistance to tibial internal rotation torque and anterior shear at the knee. ACL deficiency results in knee instability. Optimisation of muscle contraction through functional electrical stimulation (FES) offers the prospect of mitigating the destabilising effects of ACL deficiency. The hypothesis of this study is that activation of the biceps femoris long head (BFLH) reduces the tibial internal rotation torque and the anterior shear force at the knee. Gait data of twelve healthy subjects were measured with and without the application of FES and taken as inputs to a computational musculoskeletal model...
2018: PloS One
https://www.readbyqxmd.com/read/29303604/study-on-effects-of-electrical-stimulation-on-rabbit-esophageal-body-motility-in-vivo
#15
Lili Zhang, Wei Zhao, Chunshan Zhao, Hong Jin, Bin Wang, Bangmao Wang
Electric stimulation (ES) could induce contraction of intestinal smooth muscle. The aim of this study was to analyze the effects of ES on esophageal motility and the underlying mechanism in vivo. Twenty-eight rabbits were equipped with a pair of subserosa electrodes (connected to an electrical stimulator) in the lower segment of the esophagus. The ES signal consisted of bipolar rectangular pulse trains, lasting for 3.0s, with different amplitudes (1mA, 3mA, 5mA and 10mA), and frequencies (10Hz, 20Hz and 50Hz)...
January 5, 2018: Physiological Research
https://www.readbyqxmd.com/read/29299228/comparison-of-strategies-and-performance-of-functional-electrical-stimulation-cycling-in-spinal-cord-injury-pilots-for-competition-in-the-first-ever-cybathlon
#16
Christine Azevedo Coste, Vance Bergeron, Rik Berkelmans, Emerson Fachin Martins, Ché Fornusek, Arnin Jetsada, Kenneth J Hunt, Raymond Tong, Ronald Triolo, Peter Wolf
Functional Electrical Stimulation (FES) can elicit muscular contraction and restore motor function in paralyzed limbs. FES is a rehabilitation technique applied to various sensorimotor deficiencies and in different functional situations, e.g. grasping, walking, standing, transfer, cycling and rowing. FES can be combined with mechanical devices. FES-assisted cycling is mainly used in clinical environments for training sessions on cycle ergometers, but it has also been adapted for mobile devices, usually tricycles...
December 5, 2017: European Journal of Translational Myology
https://www.readbyqxmd.com/read/29299227/strategies-and-performances-of-functional-electrical-stimulation-cycling-using-the-berkelbike-with-spinal-cord-injury-in-a-competition-context-cybathlon
#17
Rik Berkelmans, Billy Woods
The functional electrical stimulation (FES) bicycle race was an event at the Cybathlon, held in Zurich October 2016. BerkelBike BV (The Netherlands) in collaboration with Imperial College London entered a spinal cord injury pilot who had tetraplegia to compete in this event. The BerkelBike Pro is a commercially available FES capable recumbent which is normally driven by the arm- and leg power. The arm cranking part was disabled. Now the tricycle must be driven using the pilots own lower limb muscles through stimulation in accordance with race rules...
December 5, 2017: European Journal of Translational Myology
https://www.readbyqxmd.com/read/29299225/fes-bike-race-preparation-to-cybathlon-2016-by-ema-team-a-short-case-report
#18
Juliana Araujo Guimarães, Lucas Oliveira da Fonseca, Ana Carolina de Sousa, Miguel Eduardo Gutierrez Paredes, George Andrew Brindeiro, Antônio Padilha Lanari Bó, Emerson Fachin-Martins
FES-assisted cycling has been recommended to people struggling to emerge from a disability to more functioning life after spinal cord injury. Recommendations issued by a gowing number of scientific papershas promised toimprove body composition and physical activity levels, as well as to controlinvoluntary muscle response; favoring activity and participation which break new grounds in expanding locomotion, leisure and occupational options for people with paraplegia and tetraplegia. In this report we described our experience to select and prepare a pilot to compete in the FES Bike Race modality at Cybathlon 2016 in Kloten (Zurick)...
December 5, 2017: European Journal of Translational Myology
https://www.readbyqxmd.com/read/29299224/the-effectiveness-of-functional-electrical-stimulation-fes-in-on-off-mode-for-enhancing-the-cycling-performance-of-team-phoenix-at-2016-cybathlon
#19
Kenry Wc Leung, Raymond Ky Tong, Xiaojun Wang, Ginny Ty Lee, Peter Mk Pang, H W Wai, H C Leung
In this study we designed a Functional Electrical Stimulation (FES) trike for a female subject with spinal cord injury to exercise her lower limbs and improve her lower limb muscle condition for attending the 2016 Cybathlon FES bike competition. Our FES pilot was the only female participant, in the FES cycling competition and she rode for Team Phoenix from the Chinese University of Hong Kong. Due to the weakness of muscles in the lower limb of the subject, and due to scoliosis over her thoracolumbar aéra, the mechanical structure of the trike had to be tailor-made to ensure she sat on the bike in a safe and secure position...
December 5, 2017: European Journal of Translational Myology
https://www.readbyqxmd.com/read/29299222/functional-electrical-stimulation-cycling-strategies-tested-during-preparation-for-the-first-cybathlon-competition-a-practical-report-from-team-ens-de-lyon
#20
Amine Metani, Lana Popović-Maneski, Sebastien Mateo, Laura Lemahieu, Vance Bergeron
Whether it is from the patient's or the physical therapist's point of view, FES cycling can be considered either as a recreational activity, or an engaging rehabilitation tool. In both cases, it keeps patients with lower-limb paralysis motivated to sustain a regular physical activity. Thus, it is not surprising that it was selected as one of the six disciplines of the first Cybathlon competition held on October 8, 2016. However, many unresolved issues prevent FES cycling from being an activity practiced outdoors on a daily basis; such as, low power production, rapid muscle fatigue, precise electrode positioning, lack of systematic procedures to determine stimulation patterns, and the difficulty of transferring disabled riders from their wheelchair to the tricycle...
December 5, 2017: European Journal of Translational Myology
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