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Muscle synergies

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https://www.readbyqxmd.com/read/28634449/electromyography-data-processing-impacts-muscle-synergies-during-gait-for-unimpaired-children-and-children-with-cerebral-palsy
#1
Benjamin R Shuman, Michael H Schwartz, Katherine M Steele
Muscle synergies calculated from electromyography (EMG) data identify weighted groups of muscles activated together during functional tasks. Research has shown that fewer synergies are required to describe EMG data of individuals with neurologic impairments. When considering potential clinical applications of synergies, understanding how EMG data processing impacts results and clinical interpretation is important. The aim of this study was to evaluate how EMG signal processing impacts synergy outputs during gait...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28623037/muscle-recruitment-and-coordination-with-an-ankle-exoskeleton
#2
Katherine M Steele, Rachel W Jackson, Benjamin R Shuman, Steven H Collins
Exoskeletons have the potential to assist and augment human performance. Understanding how users adapt their movement and neuromuscular control in response to external assistance is important to inform the design of these devices. The aim of this research was to evaluate changes in muscle recruitment and coordination for ten unimpaired individuals walking with an ankle exoskeleton. We evaluated changes in the activity of individual muscles, cocontraction levels, and synergistic patterns of muscle coordination with increasing exoskeleton work and torque...
May 18, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28592135/low-pressure-low-flow-voiding-dysfunction-in-an-elderly-male-treated-through-ayurveda-a-case-report
#3
Sanjeev Rastogi
INTRODUCTION: Neurogenic bladder is a common urological condition among elderly. It results in incontinence or retention of the urine depending on the synergy of bladder smooth muscles and urethral sphincter. There can also be a condition where retention causes overflow incontinence. Retention of urine in this condition is caused by relative lack of contractility of bladder smooth muscles in response to the stretch reflex. As a result, there is no urge and therefore the bladder remains over-distended causing retention of urine...
January 1, 2017: Journal of Evidence-based Complementary & Alternative Medicine
https://www.readbyqxmd.com/read/28560552/children-with-and-without-dystonia-share-common-muscle-synergies-while-performing-writing-tasks
#4
Francesca Lunardini, Claudia Casellato, Matteo Bertucco, Terence D Sanger, Alessandra Pedrocchi
Childhood dystonia is a movement disorder characterized by muscle overflow and variability. This is the first study that investigates upper limb muscle synergies in childhood dystonia with the twofold aim of deepening the understanding of neuromotor dysfunctions and paving the way to possible synergy-based myocontrol interfaces suitable for this neurological population. Nonnegative matrix factorization was applied to the activity of upper-limb muscles recorded during the execution of writing tasks in children with dystonia and age-matched controls...
May 30, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28558314/flexion-synergy-overshadows-flexor-spasticity-during-reaching-in-chronic-moderate-to-severe-hemiparetic-stroke
#5
Michael D Ellis, Ingrid Schut, Julius P A Dewald
OBJECTIVE: Pharmaceutical intervention targets arm flexor spasticity with an often-unsuccessful goal of improving function. Flexion synergy is a related motor impairment that may be inadvertently neglected. Here, flexor spasticity and flexion synergy are disentangled to determine their contributions to reaching dysfunction. METHODS: Twenty-six individuals participated. A robotic device systematically modulated shoulder abduction loading during ballistic reaching...
July 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28552923/the-influence-of-aging-on-the-isometric-torque-sharing-patterns-among-the-plantar-flexor-muscles
#6
Liliam F Oliveira, Debora Verneque, Luciano L Menegaldo
PURPOSE: Physiological cross-sectional area (PCSA) reduction of the triceps surae (TS) muscles during aging suggests a proportional loss of torque among its components: soleus, medial and lateral gastrocnemii. However, direct measurements of muscle forces in vivo are not feasible. The purpose of this paper was to compare, between older and young women, isometric ankle joint torque sharing patterns among TS muscles and tibialis anterior (TA). METHODS: An EMG-driven model was used for estimating individual muscle torque contributions to the total plantar flexor torque, during sustained contractions of 10% and 40% of maximum voluntary contraction (MVC)...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28552666/effects-of-force-detecting-sense-organs-on-muscle-synergies-are-correlated-with-their-response-properties
#7
Sasha N Zill, David Neff, Sumaiya Chaudhry, Annelie Exter, Josef Schmitz, Ansgar Büschges
Sense organs that monitor forces in legs can contribute to activation of muscles as synergist groups. Previous studies in cockroaches and stick insects showed that campaniform sensilla, receptors that encode forces via exoskeletal strains, enhance muscle synergies in substrate grip. However synergist activation was mediated by different groups of receptors in cockroaches (trochanteral sensilla) and stick insects (femoral sensilla). The factors underlying the differential effects are unclear as the responses of femoral campaniform sensilla have not previously been characterized...
May 25, 2017: Arthropod Structure & Development
https://www.readbyqxmd.com/read/28528818/patellar-tendon-vibration-reduces-the-increased-facilitation-from-quadriceps-to-soleus-in-post-stroke-hemiparetic-individuals
#8
Eric Maupas, Joseph-Omer Dyer, Sibele de Andrade Melo, Robert Forget
BACKGROUND: Stimulation of the femoral nerve in healthy people can facilitate soleus H-reflex and electromyography (EMG) activity. In stroke patients, such facilitation of transmission in spinal pathways linking the quadriceps and soleus muscles is enhanced and related to co-activation of knee and ankle extensors while sitting and walking. Soleus H-reflex facilitation can be depressed by vibration of the quadriceps in healthy people, but the effects of such vibration have never been studied on the abnormal soleus facilitation observed in people after stroke...
May 18, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28483469/spectral-properties-of-multiple-myoelectric-signals-new-insights-into-the-neural-origin-of-muscle-synergies
#9
Julien Frère
It is still unclear if muscle synergies reflect neural strategies or mirror the underlying mechanical constraints. Therefore, this study aimed to verify the consistency of muscle groupings between the synergies based on the linear envelope (LE) of muscle activities and those incorporating the time-frequency (TF) features of the electromyographic (EMG) signals. Twelve healthy participants performed six 20-m walking trials at a comfort and fast self-selected speed, while the activity of eleven lower limb muscles was recorded by means of surface EMG...
May 5, 2017: Neuroscience
https://www.readbyqxmd.com/read/28455740/motor-equivalence-and-structure-of-variance-multi-muscle-postural-synergies-in-parkinson-s-disease
#10
Ali Falaki, Xuemei Huang, Mechelle M Lewis, Mark L Latash
We explored posture-stabilizing multi-muscle synergies with two methods of analysis of multi-element, abundant systems: (1) Analysis of inter-cycle variance; and (2) Analysis of motor equivalence, both quantified within the framework of the uncontrolled manifold (UCM) hypothesis. Data collected in two earlier studies of patients with Parkinson's disease (PD) were re-analyzed. One study compared synergies in the space of muscle modes (muscle groups with parallel scaling of activation) during tasks performed by early-stage PD patients and controls...
April 28, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28446586/muscle-synergies-obtained-from-comprehensive-mapping-of-the-primary-motor-cortex-forelimb-representation-using-high-frequency-long-duration-icms
#11
Sommer L Amundsen Huffmaster, Gustaf M Van Acker, Carl W Luchies, Paul D Cheney
Simplifying neuromuscular control for movement has previously been explored by extracting muscle synergies from voluntary movement electromyography (EMG) patterns. The purpose of this study was to investigate muscle synergies represented in EMG recordings associated with direct electrical stimulation of single sites in primary motor cortex (M1). We applied single electrode high-frequency, long-duration intracortical microstimulation (HFLD-ICMS) to the forelimb region of M1 in two rhesus macaques using parameters previously found to produce forelimb movements to stable spatial endpoints (90-150 Hz, 90-150 μA, 1000 ms stimulus train lengths)...
April 26, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28434583/a-proposal-for-new-neurorehabilitative-intervention-on-moebius-syndrome-patients-after-smile-surgery-proof-of-concept-based-on-mirror-neuron-system-properties-and-hand-mouth-synergistic-activity
#12
REVIEW
Pier Francesco Ferrari, Anna Barbot, Bernardo Bianchi, Andrea Ferri, Gioacchino Garofalo, Nicola Bruno, Gino Coudé, Chiara Bertolini, Martina Ardizzi, Ylenia Nicolini, Mauro Belluardo, Elisa De Stefani
Studies of the last twenty years on the motor and premotor cortices of primates demonstrated that the motor system is involved in the control and initiation of movements, and in higher cognitive processes, such as action understanding, imitation, and empathy. Mirror neurons are only one example of such theoretical shift. Their properties demonstrate that motor and sensory processing are coupled in the brain. Such knowledge has been also central for designing new neurorehabilitative therapies for patients suffering from brain injuries and consequent motor deficits...
May 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28415899/specific-muscle-synergies-in-national-elite-female-ice-hockey-players-in-response-to-unexpected-external-perturbation
#13
Minhee Kim, Yushin Kim, Hyeyoung Kim, BumChul Yoon
This study aimed to investigate specific muscle synergies in elite ice hockey players indicating highly developed postural control strategies used to restore balance against unexpected external perturbations. Seven elite athletes (EA) on the women's national ice hockey team and 7 non-athletes (NA) participated in this study. Based on trajectories of centre of mass (COM), analysis periods were divided into an initial phase (a balance disturbance after perturbation onset) and a reversal phase (a balance recovery response), respectively...
April 18, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28387687/vibro-tactile-and-auditory-balance-biofeedback-changes-muscle-activity-patterns-possible-implications-for-vestibular%C3%A2-implants
#14
John H J Allum, Flurin Honegger
BACKGROUND: The two different types of balance prostheses being developed, implants and vibro-tactile/auditory feedback prostheses, rely on different measures to prove efficacy (those based on vestibular ocular reflexes versus balance control, respectively). Here we provide evidence that examining muscle activity might provide a useful alternative for both. METHODS: The muscle activity of 6 bilateral vestibular loss (BVL) and 7 age-matched healthy controls (HC) was examined while standing eyes closed on a foam support surface...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/28386223/assessment-of-upper-limb-motor-dysfunction-for-children-with-cerebral-palsy-based-on-muscle-synergy-analysis
#15
Lu Tang, Xiang Chen, Shuai Cao, De Wu, Gang Zhao, Xu Zhang
Muscle synergies are considered to be building blocks underlying motor behaviors. The goal of this study is to explore an objective and effective method to assess the upper limb motor dysfunction of cerebral palsy (CP) children from the aspect of muscle synergy analysis. Fourteen CP children and 10 typically developed (TD) children were recruited to perform three similar upper limb motion tasks related to the movements of elbow and shoulder joints, and surface electromyographic (sEMG) signals were recorded from 10 upper arm and shoulder muscles involved in the defined tasks...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28381488/increased-neuromuscular-consistency-in-gait-and-balance-after-partnered-dance-based-rehabilitation-in-parkinson-s-disease
#16
Jessica L Allen, J Lucas McKay, Andrew Sawers, Madeleine Eve Hackney, Lena H Ting
Here we examined changes in muscle coordination associated with improved motor performance after partnered, dance-based rehabilitation in individuals with mild-moderate idiopathic Parkinson's disease. Using motor module (a.k.a muscle synergy) analysis we identified changes in the modular control of overground walking and standing reactive balance that accompanied clinically meaningful improvements on behavioral measures of balance, gait, and disease symptoms after three-weeks of daily Adapted Tango classes...
April 5, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28361653/hand-function-in-muscular-dystrophies
#17
Mariana C Artilheiro, Cristina Dos Santos Cardoso de Sá, Francis M Fávero, Hanna C Wutzki, Maria Bernadete Dutra de Resende, Fátima A Caromano, Mariana C Voos
The aim of this study was to investigate the relationship between Performance of Upper Limb (PUL) and Jebsen-Taylor Test (JTT) to assess and monitor upper limb function progression in patients with muscular dystrophy. Thirty patients diagnosed with Duchenne muscular dystrophy, limb-girdle muscular dystrophy, Becker muscular dystrophy, myotonic dystrophy Type 1, and fascioscapulohumeral dystrophy were submitted to the shoulder, elbow, and wrist domains of PUL, and to JTT subtests. Spearman tests investigated the relationships between PUL and JTT total scores and domains...
April 2017: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/28342289/tgf%C3%AE-taz-srf-signalling-regulates-vascular-smooth-muscle-cell-differentiation
#18
Christina Pagiatakis, Dandan Sun, Stephanie W Tobin, Tetsuaki Miyake, John C McDermott
Vascular smooth muscle cells (VSMCs) do not terminally differentiate; they modulate their phenotype between proliferative and differentiated states, which is a major factor contributing to vascular diseases. TGFβ signalling has been implicated in inducing VSMC differentiation, although the exact mechanism remains largely unknown. Our goal was to assess the network of transcription factors involved in the induction of VSMC differentiation, and to determine the role of TAZ in promoting the quiescent VSMC phenotype...
March 25, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28338394/inter-and-intra-subject-similarity-of-muscle-synergies-during-bench-press-with-slow-and-fast-velocity
#19
Afshin Samani, Mathias Kristiansen
We investigated the effect of low and high bar velocity on inter- and intra-subject similarity of muscle synergies during bench press. Thirteen trained male subjects underwent two exercise conditions, i.e. a slow and a fast velocity bench press. Surface electromyography was recorded from thirteen muscles and muscle synergies were extracted using a non-negative matrix factorization algorithm. The intra-subject similarity across conditions and inter-subject similarity within conditions were computed for muscle synergy vectors and activation coefficients...
March 24, 2017: Motor Control
https://www.readbyqxmd.com/read/28324949/muscle-synergy-analysis-in-transtibial-amputee-during-ramp-ascending-activity
#20
P Mehryar, M S Shourijeh, H F Maqbool, M Torabi, A A Dehghani-Sanij
In developed countries, the highest number of amputees are elderly with transtibial amputation. Walking on inclined surfaces is difficult for amputees due to loss of muscle volume and strength thereby transtibial amputees (TA) rely on the intact limb to maintain stability. The aim of this study was to use the concatenated non-negative matrix factorization (CNMF) technique to calculate muscle synergy components and compare the difference in muscle synergies and their associated activation profiles in the healthy and amputee groups during ramp ascending (RA) activity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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