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https://www.readbyqxmd.com/read/29324410/decoding-motor-unit-activity-from-forearm-muscles-perspectives-for-myoelectric-control
#1
Tamas Kapelner, Francesco Negro, Oskar C Aszmann, Dario Farina
We prove the feasibility of decomposing high density surface EMG signals from forearm muscles in non-isometric wrist motor tasks of normally limbed and limb-deficient individuals with the perspective of using the decoded neural information for prosthesis control. For this purpose, we recorded surface EMG signals during motions of three degrees of freedom of the wrist in seven normally limbed subjects and two patients with limb deficiency. The signals were decomposed into individual motor unit activity with a convolutive blind source separation algorithm...
January 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29298708/case-study-of-a-user-driven-prosthetic-arm-design-bionic-hand-versus-customized-body-powered-technology-in-a-highly-demanding-work-environment
#2
Wolf Schweitzer, Michael J Thali, David Egger
BACKGROUND: Prosthetic arm research predominantly focuses on "bionic" but not body-powered arms. However, any research orientation along user needs requires sufficiently precise workplace specifications and sufficiently hard testing. Forensic medicine is a demanding environment, also physically, also for non-disabled people, on several dimensions (e.g., distances, weights, size, temperature, time). METHODS: As unilateral below elbow amputee user, the first author is in a unique position to provide direct comparison of a "bionic" myoelectric iLimb Revolution (Touch Bionics) and a customized body-powered arm which contains a number of new developments initiated or developed by the user: (1) quick lock steel wrist unit; (2) cable mount modification; (3) cast shape modeled shoulder anchor; (4) suspension with a soft double layer liner (Ohio Willowwood) and tube gauze (Molnlycke) combination...
January 3, 2018: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29298705/motor-modules-during-adaptation-to-walking-in-a-powered-ankle-exoskeleton
#3
Daniel A Jacobs, Jeffrey R Koller, Katherine M Steele, Daniel P Ferris
BACKGROUND: Modules of muscle recruitment can be extracted from electromyography (EMG) during motions, such as walking, running, and swimming, to identify key features of muscle coordination. These features may provide insight into gait adaptation as a result of powered assistance. The aim of this study was to investigate the changes (module size, module timing and weighting patterns) of surface EMG data during assisted and unassisted walking in an powered, myoelectric, ankle-foot orthosis (ankle exoskeleton)...
January 3, 2018: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29228720/gastric-myoelectric-activity-during-cisplatin-induced-acute-and-delayed-emesis-reveals-a-temporal-impairment-of-slow-waves-in-ferrets-effects-not-reversed-by-the-glp-1-receptor-antagonist-exendin-9-39
#4
Zengbing Lu, Man P Ngan, Ge Lin, David T W Yew, Xiaodan Fan, Paul L R Andrews, John A Rudd
Preclinical studies show that the glucagon-like peptide-1 (GLP-1) receptor antagonist, exendin (9-39), can reduce acute emesis induced by cisplatin. In the present study, we investigate the effect of exendin (9-39) (100 nmol/24 h, i.c.v), on cisplatin (5 mg/kg, i.p.)-induced acute and delayed emesis and changes indicative of 'nausea' in ferrets. Cisplatin induced 37.2 ± 2.3 and 59.0 ± 7.7 retches + vomits during the 0-24 (acute) and 24-72 h (delayed) periods, respectively. Cisplatin also increased (P<0...
November 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29205218/a-longitudinal-assessment-of-myoelectric-activity-postural-sway-and-low-back-pain-during-pregnancy
#5
Luciana S Moreira, Leonardo A Elias, Adriane B Gomide, Marcus F Vieira, Waldemar N DO Amaral
PURPOSE: The present study aimed at investigating the control of upright quiet standing in pregnant women throughout pregnancy, and whether low-back pain exerts influence on this motor task. METHODS: Myoelectric signals from postural muscles and stabilometric data were collected from 15 non-pregnant and 15 pregnant women during upright quiet standing. Electromyogram envelopes and center of pressure metrics were evaluated in the control group, as well as in pregnant women in their first and third trimester of pregnancy...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29201828/hand-functions-of-myoelectric-and-3d-printed-pressure-sensored-prosthetics-a-comparative-study
#6
Kyu Ho Lee, Hobeom Bin, KeunBae Kim, So Young Ahn, Bong-Ok Kim, Soo-Kyung Bok
The loss of an upper limb significantly limits the functional activities of daily living. A huge emphasis is placed on the manipulation, shape, weight, and comfort of a prosthesis, to enable its use as an inherent body part. Even with technological advances, customized upper-extremity myoelectric prosthesis remain heavy and expensive. The high cost of upper-extremity prosthesis is an especially steep economic barrier for patients. Three-dimensional (3D) printing is a promising avenue for reducing the cost of prosthesis...
October 2017: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/29200424/arm-rehabilitation-in-post-stroke-subjects-a-randomized-controlled-trial-on-the-efficacy-of-myoelectrically-driven-fes-applied-in-a-task-oriented-approach
#7
Johanna Jonsdottir, Rune Thorsen, Irene Aprile, Silvia Galeri, Giovanna Spannocchi, Ettore Beghi, Elisa Bianchi, Angelo Montesano, Maurizio Ferrarin
PURPOSE: Motor recovery of persons after stroke may be enhanced by a novel approach where residual muscle activity is facilitated by patient-controlled electrical muscle activation. Myoelectric activity from hemiparetic muscles is then used for continuous control of functional electrical stimulation (MeCFES) of same or synergic muscles to promote restoration of movements during task-oriented therapy (TOT). Use of MeCFES during TOT may help to obtain a larger functional and neurological recovery than otherwise possible...
2017: PloS One
https://www.readbyqxmd.com/read/29199518/improvement-on-upper-limb-body-powered-prostheses-1921-2016-a-systematic-review
#8
Nur Afiqah Hashim, Nasrul Anuar Abd Razak, Noor Azuan Abu Osman, Hossein Gholizadeh
Body-powered prostheses are known for their advantages of cost, reliability, training period, maintenance, and proprioceptive feedback. This study primarily aims to analyze the work related to the improvement of upper limb body-powered prostheses prior to 2016. A systematic review conducted via the search of the Web of Science electronic database, Google Scholar, and Google Patents identified 155 papers from 1921 to 2016. Sackett's initial rules of evidence were used to determine the levels of evidence, and only papers categorized in the design and development category and patents were analyzed...
December 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29188681/targeted-muscle-reinnervation-for-improved-control-of-myoelectric-upper-limb-prostheses
#9
G Vadalà, G Di Pino, L Ambrosio, L Diaz Balzani, V Denaro
Targeted muscle reinnervation (TMR) is a novel surgical technique developed to improve the control of myoelectric upper limb prostheses. Nerves transected by the amputation, which retain their original motor pathways even after being severed, are redirected to residual denervated muscles that serve as target for consequent reinnervation. Once the process is complete, reinnervated muscles will contract upon voluntary activation of transferred nerves while attempting to move missing regions of the amputated limb, generating EMG signals that can be recorded and used to control a prosthetic device...
October 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/29187203/softhand-at-the-cybathlon-a-user-s-experience
#10
Sasha Blue Godfrey, Matteo Rossi, Cristina Piazza, Manuel Giuseppe Catalano, Matteo Bianchi, Giorgio Grioli, Kristin D Zhao, Antonio Bicchi
BACKGROUND: Roughly one-quarter of upper limb prosthesis users reject their prosthesis. Reasons for rejection range from comfort, to cost, aesthetics, function, and more. This paper follows a single user from training with and testing of a novel upper-limb myoelectric prosthesis (the SoftHand Pro) for participation in the CYBATHLON rehearsal to training for and competing in the CYBATHLON 2016 with a figure-of-nine harness controlled powered prosthesis (SoftHand Pro-H) to explore the feasibility and usability of a flexible anthropomorphic prosthetic hand...
November 29, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29176944/elucidating-sensorimotor-control-principles-with-myoelectric-musculoskeletal-models
#11
REVIEW
Sarah E Goodman, Christopher J Hasson
There is an old saying that you must walk a mile in someone's shoes to truly understand them. This mini-review will synthesize and discuss recent research that attempts to make humans "walk a mile" in an artificial musculoskeletal system to gain insight into the principles governing human movement control. In this approach, electromyography (EMG) is used to sample human motor commands; these commands serve as inputs to mathematical models of muscular dynamics, which in turn act on a model of skeletal dynamics to produce a simulated motor action in real-time (i...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29157238/evaluation-of-normal-swallowing-functions-by-using-dynamic-high-density-surface-electromyography-maps
#12
Mingxing Zhu, Bin Yu, Wanzhang Yang, Yanbing Jiang, Lin Lu, Zhen Huang, Shixiong Chen, Guanglin Li
BACKGROUND: Swallowing is a continuous process with substantive interdependencies among different muscles, and it plays a significant role in our daily life. The aim of this study was to propose a novel technique based on high-density surface electromyography (HD sEMG) for the evaluation of normal swallowing functions. METHODS: A total of 96 electrodes were placed on the front neck to acquire myoelectric signals from 12 healthy subjects while they were performing different swallowing tasks...
November 21, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29156320/localised-sampling-of-myoelectric-activity-may-provide-biased-estimates-of-cocontraction-for-gastrocnemius-though-not-for-soleus-and-tibialis-anterior-muscles
#13
Maria Vinti, Jean-Michel Gracies, Marco Gazzoni, Taian Vieira
Proper muscle activity quantification is highly relevant to monitor and treat spastic cocontraction. As activity may distribute unevenly within muscle volumes, particularly for pennate calf muscles, surface electromyograms (EMGs) detected by traditional bipolar montage may provide biased estimations of muscle activity. We compared cocontraction estimates obtained using bipolar vs grids of electrodes (high-density EMG, HD-EMG). EMGs were collected from medial gastrocnemius, soleus and tibialis anterior during isometric plantar and dorsi-flexion efforts at three levels (30%, 70% and 100% MVC), knee flexed and extended...
November 14, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29121988/efficacy-of-banha-sasim-tang-on-functional-dyspepsia-classified-as-excess-pattern-study-protocol-for-a-randomized-controlled-trial
#14
Yun Hee Kim, Jun Young Kim, So Young Jung, O-Jin Kwon, Jun-Hwan Lee, Chang-Gue Son
BACKGROUND: Functional dyspepsia (FD) refers to the presence of one or more gastrointestinal symptoms including postprandial fullness, epigastric pain, burning, and early satiety without an organic explanation for chronic symptoms. FD causes considerable discomfort in patients and affects their everyday activity and productivity. Because most conventional treatments have limited efficacy, numerous patients seek alternatives such as herbal medicines. In this proposed study, we will conduct a clinical trial of an herbal drug, Banha-sasim-tang (BST)...
November 9, 2017: Trials
https://www.readbyqxmd.com/read/29095846/real-time-robustness-evaluation-of-regression-based-myoelectric-control-against-arm-position-change-and-donning-doffing
#15
Han-Jeong Hwang, Janne Mathias Hahne, Klaus-Robert Müller
There are some practical factors, such as arm position change and donning/doffing, which prevent robust myoelectric control. The objective of this study is to precisely characterize the impacts of the two representative factors on myoelectric controllability in practical control situations, thereby providing useful references that can be potentially used to find better solutions for clinically reliable myoelectric control. To this end, a real-time target acquisition task was performed by fourteen subjects including one individual with congenital upper-limb deficiency, where the impacts of arm position change, donning/doffing and a combination of both factors on control performance was systematically evaluated...
2017: PloS One
https://www.readbyqxmd.com/read/29076456/robust-extraction-of-basis-functions-for-simultaneous-and-proportional-myoelectric-control-via-sparse-non-negative-matrix-factorization
#16
Chuang Lin, Binghui Wang, Ning Jiang, Dario Farina
OBJECTIVE: This paper proposes a novel simultaneous and proportional multiple degree of freedom (DOF) myoelectric control method for active prostheses. APPROACH: The approach is based on non-negative matrix factorization (NMF) of surface EMG signals with the inclusion of sparseness constraints. By applying a sparseness constraint to the control signal matrix, it is possible to extract the basis information from arbitrary movements (quasi-unsupervised approach) for multiple DOFs concurrently...
October 27, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29070912/bi-directional-regulation-of-acupuncture-on-extrahepatic-biliary-system-an-approach-in-guinea-pigs
#17
Jingjun Zhao, Yutian Yu, Man Luo, Liang Li, Peijing Rong
Clinically, acupuncture affects the motility of the extrahepatic biliary tract, but the underlining mechanisms are still unknown. We applied manual acupuncture (MA) and electrical acupuncture (EA) separately at acupoints Tianshu (ST25), Qimen (LR14), Yanglingquan (GB34), and Yidan (CO11) in forty guinea pigs (4 groups) with or without atropinization under anesthesia while Sphincter of Oddi (SO) myoelectric activities and gallbladder pressure were monitored. In both MA and EA groups, stimulation at ST25 or LR14 significantly increased the frequency and amplitude of SO myoelectrical activities and simultaneously decreased the gallbladder pressure as compared to the pre-MA and pre-EA (P < 0...
October 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29068076/emg-based-estimation-of-limb-movement-using-deep-learning-with-recurrent-convolutional-neural-networks
#18
Peng Xia, Jie Hu, Yinghong Peng
A novel model based on deep learning is proposed to estimate kinematic information for myoelectric control from multi-channel electromyogram (EMG) signals. The neural information of limb movement is embedded in EMG signals that are influenced by all kinds of factors. In order to overcome the negative effects of variability in signals, the proposed model employs the deep architecture combining convolutional neural networks (CNNs) and recurrent neural networks (RNNs). The EMG signals are transformed to time-frequency frames as the input to the model...
October 25, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29062019/myoelectric-pattern-recognition-outperforms-direct-control-for-transhumeral-amputees-with-targeted-muscle-reinnervation-a-randomized-clinical-trial
#19
Levi J Hargrove, Laura A Miller, Kristi Turner, Todd A Kuiken
Recently commercialized powered prosthetic arm systems hold great potential in restoring function for people with upper-limb loss. However, effective use of such devices remains limited by conventional (direct) control methods, which rely on electromyographic signals produced from a limited set of muscles. Targeted Muscle Reinnervation (TMR) is a nerve transfer procedure that creates additional recording sites for myoelectric prosthesis control. The effects of TMR may be enhanced when paired with pattern recognition technology...
October 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29060778/on-a-unified-point-process-approach-for-the-characterization-of-bioelectric-discrete-phenomena
#20
Kazuo Yana, Hiroyuki Mino
This paper discusses a unified method based on the theory of point processes to characterize various types of bioelectric discrete signals such as heart beat timing, myoelectric activity, discharge of primary sensory neurons or neurons in the central nervous systems. The doubly stochastic point processes, in which the discrete event occurring intensity is stochastic, forms the most general class to characterize the discrete phenomena. In this paper the self-exciting process has been shown to be useful to characterize wide range of discrete biosignals...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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