keyword
MENU ▼
Read by QxMD icon Read
search

Muscle co contraction

keyword
https://www.readbyqxmd.com/read/29914739/toe-in-and-toe-out-walking-require-different-lower-limb-neuromuscular-patterns-in-people-with-knee-osteoarthritis
#1
Jesse M Charlton, Gillian L Hatfield, Jordan A Guenette, Michael A Hunt
Toe-in and toe-out gait modification has received attention lately as a promising treatment for knee osteoarthritis due to its potential to improve knee joint loading and pain. However, the neuromuscular patterns associated with these walking styles are not well known, a factor that may influence knee joint load itself. Our aim was to conduct a thorough examination of the neuromuscular patterns associated with toe-in and toe-out walking in people with knee osteoarthritis. Fifteen participants were instructed to walk in four different foot rotations: 10° toe-in, 0°, as well as 10° and 20° toe-out...
June 15, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29912617/is-it-possible-to-voluntarily-increase-hamstring-muscle-activation-during-landing-from-a-snow-jump-in-alpine-skiing-a-pilot-study
#2
Sebastian Färber, Dieter Heinrich, Inge Werner, Peter Federolf
Activation of the hamstrings has been discussed as a measure for reducing strain on the ACL during jump landings in alpine skiing. The current study tested the hypothesis that hamstring and quadriceps activation can be voluntarily increased by the athlete. Specifically, two different instructions - to increase hamstring activation or to increase upper-leg co-contraction - were compared to normal landings. Eight members of the German national and junior national squad in freestyle skiing (age 19.6 ± 3.8 years; weight 66...
June 18, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29889820/the-yips-methods-to-identify-golfers-with-a-dystonic-etiology-golfer-s-cramp
#3
Charles H Adler, M'hamed Temkit, Debra Crews, Troy McDaniel, Jennifer Tucker, Joseph G Hentz, Christian Marquardt, Dale Abraham, John N Caviness
PURPOSE: To determine whether quantitative methods could separate golfers with a possible dystonic cause of the "yips" from those that appear to be non-dystonic. METHODS: 27 golfers completed 10 two-handed and 10 right hand only putts. Surface EMG assessed forearm muscle co-contraction and motion detectors monitored wrist and putter movements. Based on videotape review, golfers were grouped into those with yips of dystonic etiology, those with the yips non-dystonic, and those with no yips...
June 8, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29884185/coactivation-index-of-children-with-congenital-upper-limb-reduction-deficiencies-before-and-after-using-a-wrist-driven-3d-printed-partial-hand-prosthesis
#4
Jorge M Zuniga, Katsavelis Dimitrios, Jean L Peck, Rakesh Srivastava, James E Pierce, Drew R Dudley, David A Salazar, Keaton J Young, Brian A Knarr
BACKGROUND: Co-contraction is the simultaneous activation of agonist and antagonist muscles that produces forces around a joint. It is unknown if the use of a wrist-driven 3D printed transitional prostheses has any influence on the neuromuscular motor control strategies of the affected hand of children with unilateral upper-limb reduction deficiencies. Thus, the purpose of the current investigation was to examine the coactivation index (CI) of children with congenital upper-limb reduction deficiencies before and after 6 months of using a wrist-driven 3D printed partial hand prosthesis...
June 8, 2018: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29861251/pilates-experience-vs-muscle-activation-during-abdominal-drawing-in-maneuver
#5
Alexandre Carvalho Barbosa, Edgar Ramos Vieira, Angelica Fátima Silva, Ana Carolina Coelho, Fábio Mendonça Martins, Diogo Simões Fonseca, Michelle Almeida Barbosa, Diego Bordachar
The purpose of this study was to compare the activation of deep abdominal and spine stabilizer muscles of subjects with and without Pilates experience. Twenty-three subjects were divided into a no-experience group (n = 13) and an experienced group (n = 10). The subjects performed three 12-s drawing-in maneuver trials at 50% TrA/IO maximal voluntary contraction (MVC). The experienced group presented greater activation of both muscles than the no-experience group (62% vs. 32% MVC for the TrA/IO, and 52% vs...
April 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29786115/effects-of-cardiac-output-on-the-onset-of-rocuronium-induced-neuromuscular-block-in-elderly-patients
#6
Naoki Shiraishi, Mayu Aono, Yasuhito Kameyama, Mai Yamamoto, Osamu Kitajima, Takahiro Suzuki
PURPOSE: The aim of this study was to elucidate the relationship between the onset of rocuronium-induced neuromuscular block and arterial pressure-based cardiac output (CO) in elderly patients. METHODS: Forty elderly patients aged 65-83 years were enrolled in this study. After induction of anesthesia, contractions of the adductor pollicis muscle to ulnar nerve train-of-four stimulation were acceleromyographically evaluated and 1 mg/kg rocuronium was administered following CO measurement...
May 21, 2018: Journal of Anesthesia
https://www.readbyqxmd.com/read/29778826/intra-and-inter-rater-reliabilities-for-novel-muscle-thickness-assessment-during-co-contraction-with-dual-rehabilitative-ultrasound-imaging
#7
Hwang-Jae Lee, Hyun-Geun Ha, Joohee Hahn, Seungyeop Lim, Wan-Hee Lee
OBJECTIVES: This study aimed to investigate the intra- and inter-rater reliabilities of dual-rehabilitative ultrasound imaging (D-RUSI) for the simultaneous measurement of the thickness of the tibialis anterior (TA) and gastrocnemius (GCM) muscles in healthy young adults. DESIGN: A single-group repeated-measures reliability study. SETTING: Rehabilitative ultrasound imaging analysis laboratory. PARTICIPANTS: Thirty-six healthy participants (23 males; age = 26...
May 17, 2018: Physical Therapy in Sport
https://www.readbyqxmd.com/read/29775909/sensorimotor-control-and-neuromuscular-activity-of-the-shoulder-in-adolescent-competitive-swimmers-with-generalized-joint-hypermobility
#8
Thomas Frydendal, Henrik Eshøj, Behnam Liaghat, Pascal Edouard, Karen Søgaard, Birgit Juul-Kristensen
INTRODUCTION: Shoulder pain is highly prevalent in competitive swimmers, and generalized joint hypermobility (GJH) is considered a risk factor. Sensorimotor control deficiencies and altered neuromuscular activation of the shoulder may represent underlying factors. RESEARCH QUESTION: To investigate whether competitive swimmers with GJH including shoulder hypermobility (GJHS) differ in shoulder sensorimotor control and muscle activity from those without GJH and no shoulder hypermobility (NGJH)...
May 5, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29775742/ryanodine-receptor-ca-2-release-channel-post-translational-modification-central-player-in-cardiac-and-skeletal-muscle-disease
#9
Amanda Denniss, Angela F Dulhunty, Nicole A Beard
Calcium release from internal stores is a quintessential event in excitation-contraction coupling in cardiac and skeletal muscle. The ryanodine receptor Ca2+ release channel is embedded in the internal sarcoplasmic reticulum Ca2+ store, which releases Ca2+ into the cytoplasm, enabling contraction. Ryanodine receptors form the hub of a macromolecular complex extending from the extracellular space to the sarcoplasmic reticulum lumen. Ryanodine receptor activity is influenced by the integrated effects of associated co-proteins, ions, and post-translational phosphor and redox modifications...
May 15, 2018: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/29772264/reactive-oxygen-species-impair-the-excitation-contraction-coupling-of-papillary-muscles-after-acute-exposure-to-a-high-copper-concentration
#10
Filipe Martinuzo Filetti, Dalton Valentim Vassallo, Mirian Fioresi, Maylla Ronacher Simões
Copper is an essential metal for homeostasis and the functioning of living organisms. We investigated the effects of a high copper concentration on the myocardial mechanics, investigating the reactive oxygen species (ROS) mediated effects. The developed force of papillary muscles was reduced after acute exposure to a high copper concentration and was prevented by co-incubation with tempol, DMSO and catalase. The reuptake of calcium by the sarcoplasmic reticulum was reduced by copper and restored by tempol. The contractile response to Ca2+ was reduced and reversed by antioxidants...
May 14, 2018: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/29770421/quantitative-proteomics-and-systems-analysis-of-cultured-h9c2-cardiomyoblasts-during-differentiation-over-time-supports-a-function-follows-form-model-of-differentiation
#11
Cynthia Kankeu, Kylie Clarke, Delphi Van Haver, Kris Gevaert, Francis Impens, Anna Dittrich, H Llewelyn Roderick, Egle Passante, Heinrich J Huber
The rat cardiomyoblast cell line H9C2 has emerged as a valuable tool for studying cardiac development, mechanisms of disease and toxicology. We present here a rigorous proteomic analysis that monitored the changes in protein expression during differentiation of H9C2 cells into cardiomyocyte-like cells over time. Quantitative mass spectrometry followed by gene ontology (GO) enrichment analysis revealed that early changes in H9C2 differentiation are related to protein pathways of cardiac muscle morphogenesis and sphingolipid synthesis...
May 17, 2018: Molecular omics
https://www.readbyqxmd.com/read/29761534/co-contraction-behavior-of-masticatory-and-neck-muscles-during-tooth-grinding
#12
Nikolaos Nikitas Giannakopoulos, Hans-Jürgen Schindler, Daniel Hellmann
OBJECTIVE: The objective of this study was to analyze the co-contraction behavior of jaw and neck muscles during force-controlled experimental grinding in the supine position. METHODS: Twelve symptom-free subjects were enrolled in the experiment study. Electromyographic (EMG) activity of semispinalis capitis, splenius capitis, and levator scapulae muscles was recorded bilaterally with intramuscular fine-wire electrodes, whereas that of sternocleidomastoideus, infrahyoidal, suprahyoidal, masseter, and anterior temporalis muscles were registered with surface electrodes...
May 14, 2018: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/29756296/effect-of-obesity-on-oxygen-uptake-and-cardiovascular-dynamics-during-whole-body-and-leg-exercise-in-adult-males-and-females
#13
Simon Green, Eamon O'Connor, Catherine Kiely, Donal O'Shea, Mikel Egaña
Obesity has been associated with a slowing of V˙O2 dynamics in children and adolescents, but this problem has not been studied in adults. Cardiovascular mechanisms underlying this effect are not clear. In this study, 48 adults (18 males, 30 females) grouped according to body mass index (BMI) (lean < 25 kg·m-2 , overweight = 25-29.9 kg·m-2 , obese ≥30 kg·m-2 ) provided a fasting blood sample, completed a maximal graded exercise test and six bouts of submaximal exercise on a cycle ergometer, and performed two protocols of calf exercise...
May 2018: Physiological Reports
https://www.readbyqxmd.com/read/29753912/biomimetic-soft-fibrous-hydrogels-for-contractile-and-pharmacologically-responsive-smooth-muscle
#14
Yonghui Ding, Xin Xu, Sadhana Sharma, Michael Floren, Kurt Stenmark, Stephanie J Bryant, Corey P Neu, Wei Tan
The ability to assess changes in smooth muscle contractility and pharmacological responsiveness in normal or pathological-relevant vascular tissue environments is critical to enable vascular drug discovery. However, major challenges remain in both capturing the complexity of in vivo vascular remodeling and evaluating cell contractility in complex, tissue-like environments. Herein, we developed a biomimetic fibrous hydrogel with tunable structure, stiffness, and composition to resemble the native vascular tissue environment...
May 10, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29734882/assessment-of-association-between-muscular-diagnosis-in-temporomandibular-disorders-with-mandibular-kinematics
#15
Miguel Maulén-Yáñez, Walther Meeder-Bella, Patricio Javier Videla-Jiménez, Wilfredo Alejandro González-Arriagada
Objective To study the association between mandibular kinematics and muscular diagnoses in temporomandibular disorders (TMD). Method Retrospective, descriptive clinical study based on an analysis of 370 clinical records of muscle diagnoses in TMD. Statistical analysis was performed with the SPSS program. Results Five different muscle diagnoses were considered. Myospasm and centrally mediated myalgia were discarded from the statistical analysis because of their low incidences. The diagnoses included in the analysis were protective co-contraction, myofascial pain, and myalgia...
May 7, 2018: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/29698877/higher-torque-and-muscle-fibre-conduction-velocity-of-the-biceps-brachii-in-karate-practitioners-during-isokinetic-contractions
#16
Federico Quinzi, Andrea Bianchetti, Francesco Felici, Paola Sbriccoli
PURPOSE: Although upper limb techniques are largely utilized during karate combat competitions scarce information regarding their NM control is available. This study aims at investigating the effect of karate practice on the NM control of Biceps and Triceps Brachii during isokinetic contractions to enhance current knowledge on neuromuscular control adaptations and training methodologies in combat sports. METHODS: Torque and surface electromyograms (sEMG) of Biceps Brachii Caput Longum (BB) and Triceps Brachii Lateral Head (TB) were recorded in eight karate practitioners (KA) and eight age-matched sedentary individuals (CO) during isokinetic elbow flexion-extensions (0-240°/s-1 )...
June 2018: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29689360/a-systematic-toxicity-evaluation-of-cephalosporins-via-transcriptomics-in-zebrafish-and-in-silico-admet-studies
#17
Ying Han, Jingpu Zhang, Changqin Hu
Cephalosporins are beta-lactam antibiotics that are widely used in clinics in China. However, information on their toxicity to zebrafish is limited. This study reports that the toxicity effects of cephalosporins containing an N-methyltetrazolthio ring at the C-3 position (CNMTs) exposure on zebrafish were comparable to those predicted by in silico analysis. The effects of CNMTs on the mortality and malformation rate of zebrafish were concentration-dependent. The transcriptional levels of the has1 and cnnm2a genes, which are related to embryo development and absorption of Mg2+ in vivo, significantly changed...
June 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29679247/neuromuscular-and-electromechanical-properties-of-ultra-power-athletes-the-traceurs
#18
Sidney Grosprêtre, Philippe Gimenez, Alain Martin
PURPOSE: Practising a power-type activity over years can shape the neuromuscular profile of athletes. This study aimed at comparing the neuromuscular profile of a non-trained group (NT, n = 10) to power athletes practising Parkour (= traceurs, group PK, n = 11), an activity consisting of jumping obstacles mostly in an urban landscape. METHODS: Maximal isometric plantar flexion force (MVC) and rate of torque development (RTD) were evaluated, and neuromuscular function of triceps surae muscles was assessed and compared between groups through the analysis of evoked potentials from posterior tibial nerve stimulation...
April 20, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29650545/regulation-of-blood-pressure-by-targeting-ca-v-1-2-galectin-1-protein-interaction
#19
Zhenyu Hu, Guang Li, Jiong-Wei Wang, Suet Yen Chong, Dejie Yu, Xiaoyuan Wang, Jia Lin Soon, Mui Cheng Liang, Yuk Peng Wong, Na Huang, Henry M Colecraft, Ping Liao, Tuck Wah Soong
Background -L-type CaV 1.2 channels play crucial roles in regulation of blood pressure. Galectin-1 (Gal-1), has been reported to bind to the I-II loop of CaV 1.2 channels to reduce their current density. However, the mechanistic understanding for the down-regulation of CaV 1.2 channels by Gal-1, and whether Gal-1 plays a direct role in blood pressure regulation remain unclear. Methods - In vitro experiments involving co-IP, western blot, patch-clamp recordings, immunohistochemistry and pressure myography were used to evaluate the molecular mechanisms by which Gal-1 down-regulates CaV 1...
April 12, 2018: Circulation
https://www.readbyqxmd.com/read/29625438/changes-in-myosin-heavy-chain-isoforms-along-the-length-of-orbital-fibers-in-rabbit-extraocular-muscle
#20
Christine A Lucas, Hannah S M Rhee, Joseph F Y Hoh
Purpose: Extraocular muscles express 10 myosin heavy chain (MyHC) isoforms that cater for a wide range of contractile speeds. We aim to characterize the variations in MyHC expression along the length of singly (SIFs) and multiply innervated fibers (MIFs) in the orbital layer of rabbit superior rectus muscle. Methods: Monospecific antibodies to nine MyHCs, including an anti-slow-tonic antibody characterized here were used to immunohistochemically map variations in MyHC distribution in serial sections along the muscle's full length...
March 1, 2018: Investigative Ophthalmology & Visual Science
keyword
keyword
106711
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"