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https://www.readbyqxmd.com/read/27914396/laryngeal-muscular-control-of-vocal-fold-posturing-numerical-modeling-and-experimental-validation
#1
Jun Yin, Zhaoyan Zhang
A three-dimensional continuum model of vocal fold posturing was developed to investigate laryngeal muscular control of vocal fold geometry, stiffness, and tension, which are difficult to measure in live humans or in vivo models. This model was able to qualitatively reproduce in vivo experimental observations of laryngeal control of vocal fold posturing, despite the many simplifications which are necessary due to the lack of accurate data of laryngeal geometry and material properties. The results present a first comprehensive study of the co-variations between glottal width, vocal fold length, stiffness, tension at different conditions of individual, and combined laryngeal muscle activation...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27913925/changes-in-stiffness-of-the-dorsal-scapular-muscles-before-and-after-computer-work-a-comparison-between-individuals-with-and-without-neck-and-shoulder-complaints
#2
Hiroaki Ishikawa, Takayuki Muraki, Shuhei Morise, Yusuke Sekiguchi, Nobuyuki Yamamoto, Eiji Itoi, Shin-Ichi Izumi
PURPOSE: The aim of this study was to compare the stiffness of the dorsal scapular muscles before and after computer work between individuals with and without neck and shoulder complaints. METHODS: Thirty subjects were divided into patient (n = 18) and control (n = 12) groups. The stiffness of the upper trapezius, levator scapulae, and rhomboid major was measured using ultrasound elastography before and after a 30-min typing task. The strain ratio of the muscle to an acoustic coupler was calculated (a lower strain ratio value indicates greater muscle stiffness)...
December 2, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27913924/shear-wave-elastography-reveals-different-degrees-of-passive-and-active-stiffness-of-the-neck-extensor-muscles
#3
Angela V Dieterich, Ricardo J Andrade, Guillaume Le Sant, Deborah Falla, Frank Petzke, François Hug, Antoine Nordez
PURPOSE: The neck extensor muscles contribute to spinal support and posture while performing head and neck motion. Muscle stiffness relates to passive elasticity (support) and active tensioning (posture and movement) of muscle. It was hypothesized that support and motion requirements are reflected in the distribution of stiffness between superficial and deep neck extensor muscles. METHODS: In ten healthy participants, shear modulus (stiffness) of five neck extensor muscles was determined in prone at rest and during isometric head lift at three intensities using shear wave elastography...
December 2, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27913823/mathematical-models-suggest-facilitated-fatty-acids-crossing-of-the-luminal-membrane-in-the-cardiac-muscle
#4
Efrath Barta
Long-chain fatty acids cross a few membranes on their way from the capillary blood to the cardiomyocyte cytosol, where they are utilized as an essential source of energy. Details of the transport mechanism across those membranes remained elusive despite decades of laboratory and theoretical work. Here we inspect several optional scenarios for the crossing of the luminal membrane of the endothelial cell, the first barrier that should be crossed: a passive diffusion, facilitation by receptors for albumin and facilitation by fatty acids transporters...
December 3, 2016: Journal of Membrane Biology
https://www.readbyqxmd.com/read/27912940/panax-ginseng-and-salvia-miltiorrhiza-supplementation-during-eccentric-resistance-training-in-middle-aged-and-older-adults-a-double-blind-randomized-control-trial
#5
Hsin-Fu Lin, Chun-Chung Chou, Hsiao-Han Chao, Hirofumi Tanaka
BACKGROUND: Muscle damage induced by an acute bout of eccentric exercise results in transient arterial stiffening. In this study, we sought to determine the effects of progressive eccentric resistance exercise training on vascular functions, and whether herb supplementation would enhance training adaptation by ameliorating the arterial stiffening effects. METHODS: By using a double-blinded randomized placebo-controlled design, older adults were randomly assigned to either the Panax ginseng and Salvia miltiorrhiza supplementation group (N=12) or the placebo group (N=11)...
December 2016: Complementary Therapies in Medicine
https://www.readbyqxmd.com/read/27907200/correction-increased-stiffness-in-aged-skeletal-muscle-impairs-muscle-progenitor-cell-proliferative-activity
#6
Grégory Lacraz, André-Jean Rouleau, Vanessa Couture, Thomas Söllradl, Geneviève Drouin, Noémie Veillette, Michel Grandbois, Guillaume Grenier
[This corrects the article DOI: 10.1371/journal.pone.0136217.].
2016: PloS One
https://www.readbyqxmd.com/read/27898361/movement-symptoms-in-european-moyamoya-angiopathy-first-systematic-questionnaire-study
#7
Markus Kraemer, Leonidas Trakolis, Jens Platzen, Jan Claudius Schwitalla, Anna Bersano, Philipp Albrecht, Marc Schlamann, Peter Berlit
OBJECTIVE: Movement disorders are a rare manifestation of Moyamoya angiopathy (MMA). Data on prevalence and clinical presentation are warranted. Possible involuntary movements include focal motor seizures, tremor, limb-shaking transient ischemic attacks, choreiform and spastic or dystonic movement disorders. PATIENTS AND METHODS: We developed a questionnaire to systematically assess movement disorders in MMA. Patients' history of involuntary movements and their clinical presentation were assessed systematically by interview...
November 23, 2016: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/27895704/the-extracellular-microscape-governs-mesenchymal-stem-cell-fate
#8
REVIEW
William J Hadden, Yu Suk Choi
Each cell forever interacts with its extracellular matrix (ECM); a stem cell relies on this interaction to guide differentiation. The stiffness, nanotopography, protein composition, stress and strain inherent to any given ECM influences stem cell lineage commitment. This interaction is dynamic, multidimensional and reciprocally evolving through time, and from this concerted exchange the macroscopic tissues that comprise living organisms are formed. Mesenchymal stem cells can give rise to bone, cartilage, tendon and muscle; thus attempts to manipulate their differentiation must heed the physical properties of incredibly complex native microenvironments to realize regenerative goals...
2016: Journal of Biological Engineering
https://www.readbyqxmd.com/read/27895574/robot-assisted-rehabilitation-of-ankle-plantar-flexors-spasticity-a-3-month-study-with-proprioceptive-neuromuscular-facilitation
#9
Zhihao Zhou, Yao Sun, Ninghua Wang, Fan Gao, Kunlin Wei, Qining Wang
In this paper, we aim to investigate the effect of proprioceptive neuromuscular facilitation (PNF)-based rehabilitation for ankle plantar flexors spasticity by using a Robotic Ankle-foot Rehabilitation System (RARS). A modified robot-assisted system was proposed, and seven poststroke patients with hemiplegic spastic ankles participated in a 3-month robotic PNF training. Their impaired sides were used as the experimental group, while their unimpaired sides as the control group. A robotic intervention for the experimental group started from a 2-min passive stretching to warming-up or relaxing the soleus and gastrocnemius muscles and also ended with the same one...
2016: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/27893044/failure-of-the-porcine-ascending-aorta-multidirectional-experiments-and-a-unifying-microstructural-model
#10
Colleen M Witzenburg, Rohit Y Dhume, Sachin B Shah, Christopher E Korenczuk, Hallie P Wagner, Patrick W Alford, Victor H Barocas
The ascending thoracic aorta is poorly understood mechanically, especially its risk of dissection. To make better predictions of dissection risk, more information about the multi-dimensional failure behavior of the tissue is needed, and this information must be incorporated into an appropriate theoretical / computational model. Towards the creation of such a model, uniaxial, equibiaxial, peel, and shear lap tests were performed on healthy porcine ascending aorta samples. Uniaxial and equibiaxial tests showed anisotropy with greater stiffness and strength in the circumferential direction...
November 18, 2016: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/27892823/changes-in-joint-range-of-motion-and-muscle-tendon-unit-stiffness-after-varying-amounts-of-dynamic-stretching
#11
Takamasa Mizuno
The purpose of this study was to examine the effects of varying amounts of dynamic stretching (DS) on joint range of motion (ROM) and stiffness of the muscle-tendon unit (MTU). Fifteen healthy participants participated in four randomly ordered experimental trials, which involved one (DS1), four (DS4) and seven (DS7) sets of DS, or control conditions/seated at rest (CON). Each DS set consisted of 15 repetitions of an ankle dorsiflexion-plantarflexion movement. The displacement of the muscle-tendon junction (MTJ) was measured using ultrasonography while the ankle was passively dorsiflexed at 0...
November 28, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27889803/reducing-rbm20-activity-improves-diastolic-dysfunction-and-cardiac-atrophy
#12
Florian Hinze, Christoph Dieterich, Michael H Radke, Henk Granzier, Michael Gotthardt
: Impaired diastolic filling is a main contributor to heart failure with preserved ejection fraction (HFpEF), a syndrome with increasing prevalence and no treatment. Both collagen and the giant sarcomeric protein titin determine diastolic function. Since titin's elastic properties can be adjusted physiologically, we evaluated titin-based stiffness as a therapeutic target. We adjusted RBM20-dependent cardiac isoform expression in the titin N2B knockout mouse with increased ventricular stiffness...
November 26, 2016: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
https://www.readbyqxmd.com/read/27886590/pelvic-floor-dynamics-during-high-impact-athletic-activities-a-computational-modeling-study
#13
Nicholas Dias, Yun Peng, Rose Khavari, Nissrine A Nakib, Robert M Sweet, Gerald W Timm, Arthur G Erdman, Timothy B Boone, Yingchun Zhang
BACKGROUND: Stress urinary incontinence is a significant problem in young female athletes, but the pathophysiology remains unclear because of the limited knowledge of the pelvic floor support function and limited capability of currently available assessment tools. The aim of our study is to develop an advanced computer modeling tool to better understand the dynamics of the internal pelvic floor during highly transient athletic activities. METHODS: Apelvic model was developed based on high-resolution MRI scans of a healthy nulliparous young female...
November 18, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27882355/cullin-3-mutation-causes-arterial-stiffness-and-hypertension-through-a-vascular-smooth-muscle-mechanism
#14
Larry N Agbor, Stella-Rita C Ibeawuchi, Chunyan Hu, Jing Wu, Deborah R Davis, Henry L Keen, Frederick W Quelle, Curt D Sigmund
Cullin-3 (CUL3) mutations (CUL3Δ9) were previously identified in hypertensive patients with pseudohypoaldosteronism type-II (PHAII), but the mechanism causing hypertension and whether this is driven by renal tubular or extratubular mechanisms remains unknown. We report that selective expression of CUL3Δ9 in smooth muscle acts by interfering with expression and function of endogenous CUL3, resulting in impaired turnover of the CUL3 substrate RhoA, increased RhoA activity, and augmented RhoA/Rho kinase signaling...
November 17, 2016: JCI Insight
https://www.readbyqxmd.com/read/27881411/three-distinct-cell-populations-express-extracellular-matrix-proteins-and-increase-in-number-during-skeletal-muscle-fibrosis
#15
Mark A Chapman, Kavitha Mukund, Shankar Subramaniam, David Brenner, Richard L Lieber
Tissue extracellular matrix provides structural support and creates unique environments for resident cells. However, the identities of cells responsible for creating specific ECM components have not been determined. In striated muscle, the identity of these cells becomes important in disease when ECM changes result in fibrosis and subsequent increased tissue stiffness and dysfunction. Here we describe a novel approach to isolate and identify cells that maintain the ECM in both healthy and fibrotic muscle. Using a collagen I reporter mouse, we show that there are three distinct cell populations that express collagen I in both healthy and fibrotic skeletal muscle...
November 23, 2016: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/27878491/possible-cause-of-nonlinear-tension-rise-in-activated-muscle-fiber-during-stretching
#16
P V Kochubei, S Yu Bershitsky
Tension in contracting muscle fiber under conditions of ramp stretching rapidly increases, but after reaching a critical stretch Pc sharply decreases. To find out the cause of these changes in muscle fiber tension, we stopped stretching before and after reaching Pc and left the fiber stretched for 50 msec. After rapid tension drop, the transient tension rise not accompanied by fiber stiffness increase was observed only in fibers heated to 25°C and stretched to Pc. Under other experimental conditions, this growth was absent...
November 22, 2016: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/27875930/hybrid-aorta-constructs-via-in-situ-crosslinking-of-poly-glycerol-sebacate-elastomer-within-a-decellularized-matrix
#17
Selcan Guler, Pezhman Hosseinian, Halil Murat Aydin
Decellularization of tissues and organs has high potential to obtain unique conformation and composition as native tissue structure but may result with weaken tissue mechanical strength. In this study poly(glycerol-sebacate) (PGS) elastomers were combined with decellularized aortae fragments to investigate the changes in mechanical properties. PGS prepolymer was synthesized via microwave irradiation then in-situ cross-linked within the decellularized aorta ECM. Tensile strength (σ) values were found comparable as 0...
November 22, 2016: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/27875630/eosinophilic-fasciitis-with-subjacent-myositis
#18
Julia B Whitlock, Elliot L Dimberg, Duygu Selcen, Devon I Rubin
Introduction Eosinophilic fasciitis (EF) is a rare disorder that can present with muscle symptoms that mimic other neuromuscular diseases. Methods We report a 43-year-old woman with chronic muscle aches, tightness, and stiffness with hypertrophied, well-defined muscles despite physical inactivity, and thickened skin with reduced elasticity and discoloration. Results Except for mild peripheral eosinophilia, laboratory studies, including blood count, electrolytes, paraneoplastic panel, muscle enzymes, thyroid function, and serum protein electrophoresis were normal...
November 22, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27874495/evolution-of-multiple-sclerosis-spasticity-associated-symptoms-latest-data
#19
Peter Flachenecker
In addition to muscle stiffness and increasing mobility restrictions, symptoms commonly associated with multiple sclerosis (MS) spasticity are spasms, sleep disturbances, pain, fatigue and bladder dysfunction. Treatment options include trigger factor avoidance, physiotherapy and antispasticity medication. Oral antispasticity agents commonly used in Germany are baclofen, tizanidine and gabapentin, but physician and patient satisfaction with their effectiveness is low. Over the past few years, randomized controlled trials, observational studies and registry data have demonstrated the positive risk:benefit profile of add-on 9-delta-tetra-hydrocannabinol:cannabidiol oromucosal spray for moderate-to-severe resistant MS spasticity...
December 2016: Neurodegenerative Disease Management
https://www.readbyqxmd.com/read/27874066/cl316-243-a-%C3%AE-3-adrenergic-receptor-agonist-induces-muscle-hypertrophy-and-increased-strength
#20
Daniela Puzzo, Roberto Raiteri, Clotilde Castaldo, Raffaele Capasso, Ester Pagano, Mariateresa Tedesco, Walter Gulisano, Lisaveta Drozd, Pellegrino Lippiello, Agostino Palmeri, Pietro Scotto, Maria Concetta Miniaci
Studies in vitro have demonstrated that β3-adrenergic receptors (β3-ARs) regulate protein metabolism in skeletal muscle by promoting protein synthesis and inhibiting protein degradation. In this study, we evaluated whether activation of β3-ARs by the selective agonist CL316,243 modifies the functional and structural properties of skeletal muscles of healthy mice. Daily injections of CL316,243 for 15 days resulted in a significant improvement in muscle force production, assessed by grip strength and weight tests, and an increased myofiber cross-sectional area, indicative of muscle hypertrophy...
November 22, 2016: Scientific Reports
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