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https://www.readbyqxmd.com/read/29783659/feature-extraction-and-selection-for-myoelectric-control-based-on-wearable-emg-sensors
#1
Angkoon Phinyomark, Rami N Khushaba, Erik Scheme
Specialized myoelectric sensors have been used in prosthetics for decades, but, with recent advancements in wearable sensors, wireless communication and embedded technologies, wearable electromyographic (EMG) armbands are now commercially available for the general public. Due to physical, processing, and cost constraints, however, these armbands typically sample EMG signals at a lower frequency (e.g., 200 Hz for the Myo armband) than their clinical counterparts. It remains unclear whether existing EMG feature extraction methods, which largely evolved based on EMG signals sampled at 1000 Hz or above, are still effective for use with these emerging lower-bandwidth systems...
May 18, 2018: Sensors
https://www.readbyqxmd.com/read/29780317/one-channel-surface-electromyography-decomposition-for-muscle-force-estimation
#2
Wentao Sun, Jinying Zhu, Yinlai Jiang, Hiroshi Yokoi, Qiang Huang
Estimating muscle force by surface electromyography (sEMG) is a non-invasive and flexible way to diagnose biomechanical diseases and control assistive devices such as prosthetic hands. To estimate muscle force using sEMG, a supervised method is commonly adopted. This requires simultaneous recording of sEMG signals and muscle force measured by additional devices to tune the variables involved. However, recording the muscle force of the lost limb of an amputee is challenging, and the supervised method has limitations in this regard...
2018: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/29779466/a-systematic-review-of-shock-attenuating-componentry-for-lower-limb-amputees
#3
Mitchell Farrar, Emma Thomas
BACKGROUND: Shock-attenuating pylons are commonly fitted to prostheses in order to compensate for the anatomical and biomechanical shock-absorbing features of the lower limb removed upon amputation. However, studies concerning their shock-attenuating capacity are highly variable and, to date, have not yet been reviewed, making them difficult to interpret and apply in clinical practice. OBJECTIVES: To synthesise and appraise the available literature examining the effectiveness of shock-attenuating pylons in attenuating shock upon limb loading compared to rigid pylons among lower limb amputees...
May 1, 2018: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/29779455/function-quality-of-life-and-community-integration-of-deka-arm-users-after-discharge-from-prosthetic-training-impact-of-home-use-experience
#4
Linda Resnik, Frantzy Acluche, Matthew Borgia, Jill Cancio, Gail Latlief, Nicole Sasson
BACKGROUND: Research on adaptation to advanced upper limb prostheses is needed. OBJECTIVES: To (1) examine change in function, quality of life and community integration after prosthetic training, (2) determine whether change in outcomes varied by prosthesis complexity, and (3) compare patterns of change at 1 month for those who withdrew from the study and those who did not. STUDY DESIGN: Quasi-experimental time series. METHODS: Data were analyzed for 22 participants (18 completers)...
May 1, 2018: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/29769415/upregulation-of-microrna-340-promotes-osteosarcoma-cell-apoptosis-while-suppressing-proliferation-migration-and-invasion-by-inactivating-the-ctnnb1-mediated-notch-signaling-pathway
#5
Bao-Long Pan, Ling Wu, Li Pan, Yu-Xi Yang, Hu-Huan Li, Yan-Juan Dai, Zi-Qian He, Ling Tan, You-Guang Huang, Zong-Wu Tong, Jun-Long Liao
Osteosarcoma (OS) is the most common histological form of primary bone cancer. It is most prevalent in teenagers and young adults. This study aims at exploring the regulatory effect of microRNA-340 (miR-340) on OS cell proliferation, invasion, migration and apoptosis via regulating the Notch signaling pathway by targeting CTNNB1. OS tissues belonging to 45 patients and normal femoral head tissues of 45 amputees were selected. Cells were allocated to different groups. In Situ hybridization was performed to determine the positive rate of miR-340 expression while immunohistochemistry was used to determine that of CTNNB1 and B-cell lymphoma 2 (Bcl-2)...
May 16, 2018: Bioscience Reports
https://www.readbyqxmd.com/read/29766003/the-status-of-nitric-oxide-and-its-backup-heme-oxygenase-1-in-thromboangiitis-obliterans
#6
Ali Aliee, Farnaz Zahedi Avval, Hossein Taheri, Saeedeh Mehraban Moghadam, Mohammad Soukhtanloo, Daryoush Hamidi Alamdari, Bahare Fazeli
Background: Until recently, a gene polymorphism in the promoter region of endothelial nitric oxide synthase has been suggested as a risk factor for thromboangiitis obliterans (TAO) development. The aim of this study was to compare the metabolites of nitric oxide (NO) and its backup, heme-oxygenase-1 (HMOX1), between TAO patients and those of a smoking control group matched by race, age, sex, and smoking habits. Methods: Twenty-four male Caucasian TAO patients and 20 male Caucasian controls enrolled in the study...
April 2018: Reports of Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/29760647/discrimination-and-recognition-of-phantom-finger-sensation-through-transcutaneous-electrical-nerve-stimulation
#7
Mengnan Li, Dingguo Zhang, Yao Chen, Xinyu Chai, Longwen He, Ying Chen, Jinyao Guo, Xiaohong Sui
Tactile sensory feedback would make a significant contribution to the state-of-the-art prosthetic hands for achieving dexterous manipulation over objects. Phantom finger sensation, also called referred sensation of lost fingers, can be noninvasively evoked by transcutaneous electrical nerve stimulation (TENS) of the phantom finger territories (PFTs) near the stump for upper-limb amputees. As such, intuitive sensations pertaining to lost fingers could be non-invasively generated. However, the encoding of stimulation parameters into tactile sensations that can be intuitively interpreted by the users remains a significant challenge...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29756458/evaluation-of-the-effects-of-adding-vibrotactile-feedback-to-myoelectric-prosthesis-users-on-performance-and-visual-attention-in-a-dual-task-paradigm
#8
Eitan Raveh, Jason Friedman, Sigal Portnoy
OBJECTIVE: To evaluate the effects of adding vibrotactile feedback to myoelectric prosthesis users on the performance time and visual attention in a dual-task paradigm. DESIGN: A repeated-measures design with a counterbalanced order of two conditions. SETTING: Laboratory setting. SUBJECTS: Transradial amputees using a myoelectric prosthesis with normal or corrected eyesight ( N = 12, median age = 65 ± 13 years)...
May 1, 2018: Clinical Rehabilitation
https://www.readbyqxmd.com/read/29755399/leg-prosthesis-with-somatosensory-feedback-reduces-phantom-limb-pain-and-increases-functionality
#9
Caroline Dietrich, Sandra Nehrdich, Sandra Seifert, Kathrin R Blume, Wolfgang H R Miltner, Gunther O Hofmann, Thomas Weiss
Phantom limb pain (PLP) develops in most patients with lower limb amputation. Changes in the peripheral and central nervous system (CNS) are hypothesized to contribute to PLP. Based on ideas to modify neural reorganization within the CNS, the aim of the study was to test, whether prostheses with somatosensory feedback might help to reduce PLP, and increase the functionality of movement with a prosthesis. We therefore equipped the prostheses of 14 lower leg amputees with a simple to use feedback system that provides electrocutaneous feedback to patients' thigh whenever the foot and toes of the prosthesis touch the ground...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29754521/development-of-a-scoring-tool-blart-score-to-predict-functional-outcome-in-lower-limb-amputees
#10
Sarah Bowrey, Helen Naylor, Pip Russell, Jonathan Thompson
PURPOSE: To develop a valid preoperative scoring tool that predicts the probability of walking with a prosthetic limb after major lower limb amputation. METHODS: A retrospective review of 338 patients who had undergone lower limb amputation was conducted to identify characteristics that affected the success of rehabilitation with a prosthetic limb. These data were used to devise an assessment tool (the BLARt score), which was then tested and validated in 199 patients planned to undergo lower limb amputation in two UK regional centers...
May 12, 2018: Disability and Rehabilitation
https://www.readbyqxmd.com/read/29753888/mobility-and-satisfaction-with-a-microprocessor-controlled-knee-in-moderately-active-amputees-a-multi-centric-randomized-crossover-trial
#11
Céline Lansade, Eric Vicaut, Jean Paysant, Doménico Ménager, Marie-Christine Cristina, Frank Braatz, Stephan Domayer, Dominic Pérennou, Gérard Chiesa
OBJECTIVE: Microprocessor-controlled knees are generally prescribed and reimbursed for active amputees. Recent studies suggested that this technology could be useful for amputees with moderate activity level. We compared the efficiency of a microprocessor-controlled knee (MPK, Kenevo, Otto Bock) and non-MPKs (NMPKs) in these indications. METHODS: A multi-centric randomized crossover trial was conducted in 16 hospitals from 3 European countries. Participants were randomized to an MPK-NMPK sequence, testing the MPK for 3 months and the NMPK for 1 month, or to an NMPK-MPK sequence, testing the NMPK for 1 month and the MPK for 3 months...
May 10, 2018: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/29752241/upper-limb-prosthesis-control-for-high-level-amputees-via-myoelectric-recognition-of-leg-gestures
#12
Kenneth R Lyons, Sanjay S Joshi
Recognition of motion intent via surface electromyography (EMG) has become increasingly practical for prosthesis control, but lacking residual muscle sites remains a major obstacle to its use by high-level amputees. Currently, there are few approaches to upper limb prosthesis control for individuals with amputations proximal to the elbow, all of which suffer from one or more of three primary problems: invasiveness, the need for intensive training, and lacking functionality. Using surface EMG sensors placed on the lower leg and a natural mapping between degrees of freedom of the leg and the arm, we tested a noninvasive control approach by which high-level amputees could control prosthetic elbow, wrist, and hand movements with minimal training...
May 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29752234/a-stair-ascent-and-descent-controller-for-a-powered-ankle-prosthesis
#13
Steven Culver, Harrison Bartlett, Amanda Shultz, Michael Goldfarb
This paper presents a control system for a powered transtibial prosthesis that provides stair ascent and descent capability, as well as ability for user-controlled transitions between walking, standing, stair ascent, and stair descent. The control system was implemented on a powered prosthesis and evaluated on a single unilateral transtibial amputee subject. The ability of the prosthesis to provide appropriate functionality during stair ascent and descent was assessed by comparing gait kinematics and kinetics of the prosthesis to those of a passive dynamic elastic response prosthesis and those of a set of non-amputee subjects...
May 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29747672/two-ways-to-improve-myoelectric-control-for-a-transhumeral-amputee-after-targeted-muscle-reinnervation-a-case-study
#14
Yang Xu, Dingguo Zhang, Yang Wang, Juntao Feng, Wendong Xu
BACKGROUND: Myoelectric control of multifunctional prostheses is challenging for individuals with high-level amputations due to insufficient surface electromyography (sEMG) signals. A surgical technique called targeted muscle reinnervation (TMR) has achieved impressive improvements in myoelectric control by providing more sEMG control signals. In this case, some channels of sEMG signals are coupled after TMR, which limits the performance of conventional amplitude-based control for upper-limb prostheses...
May 10, 2018: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29742031/case-studies-in-neuroscience-sensations-elicited-and-discrimination-ability-from-nerve-cuff-stimulation-in-an-amputee-over-time
#15
Rochelle Ackerley, Helena Backlund Wasling, Max Ortiz Catalan, Rickard Brånemark, Johan Wessberg
The present case study details sensations elicited by electrical stimulation of peripheral nerve axons using an implanted nerve cuff electrode, in a participant with a transhumeral amputation. The participant uses an osseointegrated electromechanical interface, which enables skeletal attachment of the prosthesis and long-term, stable, bidirectional communication between the implanted electrodes and prosthetic arm. We focused on evoking somatosensory percepts, where we tracked and quantified the evolution of perceived sensations in the missing hand, which were evoked from electrical stimulation of the nerve, for over 2 years...
May 9, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29717894/amputees-at-high-altitude-the-potentially-sticky-issue-of-thrombophilia
#16
Benjamin S Stacey, Lewis Fall, David Shearer, Martin Steggall, Ian W Williams, Michael H Lewis, Damian Miles Bailey
No abstract text is available yet for this article.
May 2, 2018: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/29710741/the-comparison-of-transfemoral-amputees-using-mechanical-and-microprocessor-controlled-prosthetic-knee-under-different-walking-speeds-a-randomized-cross-over-trial
#17
Wujing Cao, Hongliu Yu, Weiliang Zhao, Qiaoling Meng, Wenming Chen
BACKGROUND: The microprocessor-controlled prosthetic knees have been introduced to transfemoral amputees due to advances in biomedical engineering. A body of scientific literature has shown that the microprocessor-controlled prosthetic knees improve the gait and functional abilities of persons with transfemoral amputation. OBJECTIVE: The aim of this study was to propose a new microprocessor-controlled prosthetic knee (MPK) and compare it with non-microprocessor-controlled prosthetic knees (NMPKs) under different walking speeds...
April 20, 2018: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/29698851/transfemoral-amputee-intact-limb-loading-and-compensatory-gait-mechanics-during-down-slope-ambulation-and-the-effect-of-prosthetic-knee-mechanisms
#18
David C Morgenroth, Michelle Roland, Alison L Pruziner, Joseph M Czerniecki
BACKGROUND: Intact limb knee osteoarthritis is a prevalent secondary disability in transfemoral amputees. Walking down a ramp may increase this risk due to excessive limb loading. We sought to determine whether intact limb loading differed between transfemoral amputees and controls during down slope ambulation, and the compensatory strategies transfemoral amputees used to modify intact limb loading. Secondarily, we sought to determine the effect of prosthetic knee type. METHODS: Five unilateral transfemoral amputees and five non-amputee controls walked down a ramp and the following outcome measures were compared between amputees and controls and across prosthetic knee type (C-leg versus Power Knee): step length, walking speed, leading limb ground reaction forces, and trailing and leading limb ankle and knee energy absorption...
April 12, 2018: Clinical Biomechanics
https://www.readbyqxmd.com/read/29689443/the-effect-of-time-on-emg-classification-of-hand-motions-in-able-bodied-and-transradial-amputees
#19
Asim Waris, Imran Khan Niazi, Mohsin Jamil, Omer Gilani, Kevin Englehart, Winnie Jensen, Muhammad Shafique, Ernest Nlandu Kamavuako
While several studies have demonstrated the short-term performance of pattern recognition systems, long-term investigations are very limited. In this study, we investigated changes in classification performance over time. Ten able-bodied individuals and six amputees took part in this study. EMG signals were recorded concurrently from surface and intramuscular electrodes, with intramuscular electrodes kept in the muscles for seven days. Seven hand motions were evaluated daily using linear discriminant analysis and the classification error quantified within (WCE) and between (BCE) days...
April 17, 2018: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29689178/gender-differences-in-psychosocial-and-physical-outcomes-in-haitian-amputees
#20
Pey-Shan Wen, Marilys G Randolph, Leonard Elbaum, Mario De la Rosa
OBJECTIVE: The purpose of this study was to investigate the gender differences in psychosocial and physical outcomes in users of lower-extremity prostheses who became amputees after the 2010 earthquake in Haiti. METHOD: We enrolled 140 unilateral amputees in this cross-sectional study in Port-au-Prince, Haiti. Trained staff administered the assessments by reading the questions aloud to participants. Participants completed the Trinity Amputation and Prosthesis Experience Scales and Locomotor Capabilities Index about 2 yr after the earthquake...
May 2018: American Journal of Occupational Therapy: Official Publication of the American Occupational Therapy Association
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