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Muscle synergies

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https://www.readbyqxmd.com/read/28724779/chronic-pain-alters-spatiotemporal-activation-patterns-of-forearm-muscle-synergies-during-the-development-of-grip-force
#1
Nagarajan Manickaraj, Leanne M Bisset, Venkata S P T Devanaboyina, Justin J Kavanagh
It is largely unknown how the CNS regulates multiple muscle systems in the presence of pain. This study used muscle synergy analysis to investigate multiple forearm muscles in individuals with chronic elbow pain during the development of grip force. Eleven individuals with chronic elbow pain and 11 healthy age-matched controls developed grip force to 15% and 30% of MVC. Surface EMG was obtained from six forearm muscles during force development before non-negative matrix factorization was performed. The relationship between muscle synergies and standard clinical tests of elbow pain were examined using linear regression...
July 19, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28713811/reducing-the-impact-of-shoulder-abduction-loading-on-the-classification-of-hand-opening-and-grasping-in-individuals-with-poststroke-flexion-synergy
#2
Yiyun Lan, Jun Yao, Julius P A Dewald
Application of neural machine interface in individuals with chronic hemiparetic stroke is regarded as a great challenge, especially for classification of the hand opening and grasping during a functional upper extremity movement such as reach-to-grasp. The overall accuracy of classifying hand movements, while actively lifting the paretic arm, is subject to a significant reduction compared to the accuracy when the arm is fully supported. Such a reduction is believed to be due to the expression of flexion synergy, which couples shoulder abduction (SABD) with elbow/wrist and finger flexion, and is common in up to 60% of the stroke population...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28705908/importance-of-kynurenine-in-pulmonary-hypertension
#3
Bence M Nagy, Chandran Nagaraj, Andreas Meinitzer, Neha Sharma, Rita Papp, Vasile Foris, Bahil Ghanim, Grazyna Kwapiszewska, Gabor Kovacs, Walter Klepetko, Thomas R Pieber, Harald Mangge, Horst Olschewski, Andrea Oslchewski
The tryptophan metabolite kynurenine is significantly increased in pulmonary arterial hyper-tension (PAH) patients, and it is a potent vasodilator of systemic arteries. Our aim was to in-vestigate the role of kynurenine in the pulmonary circulation. Serum tryptophan, kynurenine and kynurenic-acid levels were measured in 20 idiopathic PAH (IPAH) patients, 20 healthy controls and 20 patients with chronic lung disease or meta-bolic syndrome without-PH. Laser-dissected pulmonary arteries from IPAH and control lungs were tested for the expression of IDO, the rate-limiting enzyme for the conversion from tryptophan to kynurenine...
July 13, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28691192/bilirubin-coating-attenuates-the-inflammatory-response-to-everolimus-coated-stents
#4
In-Ho Bae, Dae Sung Park, So-Youn Lee, Eun-Jae Jang, Jae-Won Shim, Kyung-Seob Lim, Jun-Kyu Park, Ju Han Kim, Doo Sun Sim, Myung Ho Jeong
The aim of this study was to evaluate the effects of bilirubin- and/or everolimus (EVL)-coated stents to prevent arterial neointimal hyperplasia and inflammation in vitro and in vivo. The stents were prepared by spray coating bare metal stents (BMS) with bilirubin and/or EVL. Study groups were divided into (1) BMS, (2) bilirubin-coated stents (BES), (3) commercialized stents (Synergy™; EES), and (4) bilirubin/EVL-coated stents (B-EES). The coating thickness and drug release rates were comparable to previous reports (i...
July 10, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28677664/allergenic-proteases-cleave-the-chemokine-cx3cl1-directly-from-the-surface-of-airway-epithelium-and-augment-the-effect-of-rhinovirus
#5
M Loxham, D E Smart, N J Bedke, N P Smithers, I Filippi, C Blume, E J Swindle, K Tariq, P H Howarth, S T Holgate, D E Davies
CX3CL1 has been implicated in allergen-induced airway CD4(+) T-lymphocyte recruitment in asthma. As epidemiological evidence supports a viral infection-allergen synergy in asthma exacerbations, we postulated that rhinovirus (RV) infection in the presence of allergen augments epithelial CX3CL1 release. Fully differentiated primary bronchial epithelial cultures were pretreated apically with house dust mite (HDM) extract and infected with rhinovirus-16 (RV16). CX3CL1 was measured by enzyme-linked immunosorbent assay and western blotting, and shedding mechanisms assessed using inhibitors, protease-activated receptor-2 (PAR-2) agonist, and recombinant CX3CL1-expressing HEK293T cells...
July 5, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28677652/relationship-between-handgrip-strength-and-muscle-mass-in-female-survivors-of-breast-cancer-a-mediation-analysis
#6
Lorena Benavides-Rodríguez, Antonio García-Hermoso, Diogo Rodrigues-Bezerra, Mikel Izquierdo, Jorge Enrique Correa-Bautista, Robinson Ramírez-Vélez
This study explored the mediating factors of sarcopenia in a group of women survivors of breast cancer in Bogotá, Colombia. This was a descriptive cross-sectional study with 98 women survivors of breast cancer, who were registered with the SIMMON (Integrated Synergies to Improve Oncological Management in Colombia) Foundation. Body weight, height, and waist circumference (WC) were measured, and body mass index (BMI) was calculated. Body composition (percentage of fat and muscle mass) was evaluated via four-pole bioelectrical impedance analysis...
July 4, 2017: Nutrients
https://www.readbyqxmd.com/read/28675778/hip-abductor-muscle-activity-during-walking-in-individuals-with-gluteal-tendinopathy
#7
Kim Allison, Sauro E Salomoni, Kim L Bennell, Tim V Wrigley, Francois Hug, Bill Vicenzino, Alison Grimaldi, Paul W Hodges
The external hip adduction moment during walking is greater in individuals with gluteal tendinopathy (GT) than pain-free controls. Although this likely represents a greater demand on the hip abductor muscles implicated in GT, no study has investigated activation of these muscles in GT. For this purpose, fine wire electrodes were inserted into the segments of the gluteus minimus and medius muscles, and surface electrodes placed on the tensor fascia lata, upper gluteus maximus and vastus lateralis muscles of thirteen individuals with, and thirteen without, GT...
July 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28674489/multi-finger-interaction-and-synergies-in-finger-flexion-and-extension-force-production
#8
Jaebum Park, Dayuan Xu
The aim of this study was to discover finger interaction indices during single-finger ramp tasks and multi-finger coordination during a steady state force production in two directions, flexion, and extension. Furthermore, the indices of anticipatory adjustment of elemental variables (i.e., finger forces) prior to a quick pulse force production were quantified. It is currently unknown whether the organization and anticipatory modulation of stability properties are affected by force directions and strengths of in multi-finger actions...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28659855/upper-extremity-motor-impairments-and-microstructural-changes-in-bulbospinal-pathways-in-chronic-hemiparetic-stroke
#9
Meriel Owen, Carson Ingo, Julius P A Dewald
Following hemiparetic stroke, precise, individuated control of single joints is often replaced by highly stereotyped patterns of multi-joint movement, or abnormal limb synergies, which can negatively impact functional use of the paretic arm. One hypothesis for the expression of these synergies is an increased dependence on bulbospinal pathways such as the rubrospinal (RubST) tract and especially the reticulospinal (RetST) tracts, which co-activate multiple muscles of the shoulder, elbow, wrist, and fingers...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28659460/intermuscular-coherence-reflects-functional-coordination
#10
Christopher M Laine, Francisco J Valero-Cuevas
Coherence analysis has the ability to identify the presence of common descending drive shared by motor unit pools, and reveals its spectral properties. However, the link between spectral properties of shared neural drive and functional interactions among muscles remains unclear. We assessed shared neural drive between muscles of the thumb and index finger while participants executed two mechanically distinct precision pinch tasks, each requiring distinct functional coordination among muscles. We found that shared neural drive was systematically reduced or enhanced at specific frequencies of interest (~10 and ~40 Hz)...
June 28, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28647390/neural-synergies-for-controlling-reach-and-grasp-movement-in-macaques
#11
Yaoyao Hao, Shaomin Zhang, Qiaosheng Zhang, Guanglin Li, Weidong Chen, Xiaoxiang Zheng
It has been suggested that the brain adopts a simplified strategy to coordinate a large number of degrees of freedom in motor control. Synergies have been proposed as a strategy to produce movements by recruitment of a small number of fixed modular patterns. However, there is no direct support for a synergistic organization of the brain itself. In this study, we recorded neural activities from the dorsal premotor cortex (PMd) of monkeys trained to reach and grasp differently shaped objects (grasping task) or the same object in different positions (reaching task)...
June 22, 2017: Neuroscience
https://www.readbyqxmd.com/read/28634449/electromyography-data-processing-impacts-muscle-synergies-during-gait-for-unimpaired-children-and-children-with-cerebral-palsy
#12
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
#13
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...
July 5, 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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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