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Muscle physiology

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https://www.readbyqxmd.com/read/28820033/unregulated-saphenous-vein-graft-distension-decreases-tissue-viscoelasticity
#1
Eric S Wise, Kyle M Hocking, Brian C Evans, Craig L Duvall, Joyce Cheung-Flynn, Colleen M Brophy
OBJECTIVES: Unregulated intraoperative distension of human saphenous vein (SV) graft leads to supraphysiologic luminal pressures and causes acute physiologic and cellular injury to the conduit. The effect of distension on tissue viscoelasticity, a biophysical property critical to a successful graft, is not well described. In this investigation, we quantify the loss of viscoelasticity in SV deformed by distension and compare the results to tissue distended in a pressure-controlled fashion...
September 2017: Perfusion
https://www.readbyqxmd.com/read/28818539/playing-a-rigged-game-inequality-s-effect-on-physiological-stress-responses
#2
Martin S Shapiro, Rhanda Rylant, Amanda de Lima, Andrea Vidaurri, Herman van de Werfhorst
High income and wealth inequality corresponds with high rates of various health and social problems. One possible factor that could be contributing to this correlation is stress experienced by those being treated unfairly in an unequal society. The present experiment attempted to simulate aspects of income inequality in a lab setting while recording several measures of stress. Participants (n=96) were assigned to one of four groups and played a memory game against a confederate opponent to earn "money" to spend in a lab market...
August 14, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28818476/complex-anatomic-abnormalities-of-the-lower-leg-muscles-and-tendons-associated-with-phocomelia-a-case-report
#3
Thomas Hodo, Mark Hamrick, Yulia Melenevsky
Musculoskeletal anatomy is widely known to have components that stray from the norm in the form of variant muscle and tendon presence, absence, origin, insertion, and bifurcation. Although these variant muscles and tendons might be deemed incidental and insignificant findings by most, they can be important contributors to pathologic physiology or, more importantly, an option for effective treatment. In the present case report, we describe a patient with phocomelia and Müllerian abnormalities secondary to in utero thalidomide exposure...
August 14, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28818154/physiology-based-modeling-may-predict-surgical-treatment-outcome-for-obstructive-sleep-apnea
#4
Yanru Li, Jingying Ye, Demin Han, Xin Cao, Xiu Ding, Yuhuan Zhang, Wen Xu, Jeremy Orr, Rachel Jen, Scott Sands, Atul Malhotra, Robert Owens
STUDY OBJECTIVES: To test whether the integration of both anatomical and nonanatomical parameters (ventilatory control, arousal threshold, muscle responsiveness) in a physiology-based model will improve the ability to predict outcomes after upper airway surgery for obstructive sleep apnea (OSA). METHODS: In 31 patients who underwent upper airway surgery for OSA, loop gain and arousal threshold were calculated from preoperative polysomnography (PSG). Three models were compared: (1) a multiple regression based on an extensive list of PSG parameters alone; (2) a multivariate regression using PSG parameters plus PSG-derived estimates of loop gain, arousal threshold, and other trait surrogates; (3) a physiological model incorporating selected variables as surrogates of anatomical and nonanatomical traits important for OSA pathogenesis...
August 14, 2017: Journal of Clinical Sleep Medicine: JCSM: Official Publication of the American Academy of Sleep Medicine
https://www.readbyqxmd.com/read/28818044/effects-of-the-vertically-transmitted-microsporidian-facilispora-margolisi-and-the-parasiticide-emamectin-benzoate-on-salmon-lice-lepeophtheirus-salmonis
#5
Jordan D Poley, Ben J G Sutherland, Mark D Fast, Ben F Koop, Simon R M Jones
BACKGROUND: Microsporidia are highly specialized, parasitic fungi that infect a wide range of eukaryotic hosts from all major taxa. Infections cause a variety of damaging effects on host physiology from increased stress to death. The microsporidian Facilispora margolisi infects the Pacific salmon louse (Lepeophtheirus salmonis oncorhynchi), an economically and ecologically important ectoparasitic copepod that can impact wild and cultured salmonids. RESULTS: Vertical transmission of F...
August 17, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28816745/restoration-of-normal-sympathetic-neural-function-in-heart-failure-following-baroreflex-activation-therapy-final-43-month-study-report
#6
Raffaella Dell'Oro, Edoardo Gronda, Gino Seravalle, Giuseppe Costantino, Luca Alberti, Barbara Baronio, Tiziana Staine, Emilio Vanoli, Giuseppe Mancia, Guido Grassi
BACKGROUND: Baroreflex activation therapy (BAT) exerts in severe heart failure sympathoinhibitory effects, improving clinical variables and reducing hospitalization rate. The current follow-up study was aimed at determining the long-term effects of BAT, assessing whether BAT in heart failure allows to restore physiological levels of sympathetic function. METHODS: Seven patients out of the 11 heart failure patients aged 66.5 ± 3 years (mean ± SEM) in New York Heart Association Class III with left ventricular ejection fraction 40% or less and impaired functional capacity recruited in the study survived at the final follow-up (43...
August 14, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28814736/emotions-alter-muscle-proprioceptive-coding-of-movements-in-humans
#7
Rochelle Ackerley, Jean-Marc Aimonetti, Edith Ribot-Ciscar
Emotions can evoke strong reactions that have profound influences, from gross changes in our internal environment to small fluctuations in facial muscles, and reveal our feelings overtly. Muscles contain proprioceptive afferents, informing us about our movements and regulating motor activities. Their firing reflects changes in muscle length, yet their sensitivity can be modified by the fusimotor system, as found in animals. In humans, the sensitivity of muscle afferents is modulated by cognitive processes, such as attention; however, it is unknown if emotional processes can modulate muscle feedback...
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28814636/muscle-proprioceptors-in-adult-rat-mechanosensory-signaling-and-synapse-distribution-in-spinal-cord
#8
Jacob A Vincent, Hanna M Gabriel, Adam S Deardorff, Paul Nardelli, Robert E W Fyffe, Thomas J Burkholder, Timothy C Cope
The characteristic signaling and intra-spinal projections of muscle proprioceptors best described in the cat are often generalized across mammalian species. However, species-dependent adaptations within this system seem necessary to accommodate asymmetric scaling of length, velocity, and force information required by the physics of movement. In the present study we report mechanosensory responses and intraspinal destinations of three classes of muscle proprioceptors. Proprioceptors from triceps surae muscles in adult female Wistar rats anesthetized with isoflurane were physiologically classified as muscle spindle group Ia or II or as tendon organ group Ib afferents, studied for their firing responses to passive-muscle stretch, and in some cases, labeled and imaged for axon projections and varicosities in spinal segments...
August 16, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28814064/electrical-properties-assessed-by-bioelectrical-impedance-spectroscopy-as-biomarkers-of-age-related-loss-of-skeletal-muscle-quantity-and-quality
#9
Yosuke Yamada, Bjoern Buehring, Diane Krueger, Rozalyn M Anderson, Dale A Schoeller, Neil Binkley
Skeletal muscle, in addition to being comprised of a heterogeneous muscle fiber population, also includes extracellular components that do not contribute to positive tensional force production. Here we test segmental bioelectrical impedance spectroscopy (S-BIS) to assess muscle intracellular mass and composition. S-BIS can evaluate electrical properties that may be related to muscle force production. Muscle fiber membranes separate the intracellular components from the extracellular environment and consist of lipid bilayers which act as an electrical capacitor...
September 1, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28813886/exploratory-design-of-a-compliant-mechanism-for-a-dynamic-hand-orthosis-lessons-learned
#10
Ronald A Bos, Dick H Plettenburg, Just L Herder
This study does not describe a success-story. Instead, it describes an exploratory process and the lessons learned while designing a compliant mechanism for a dynamic hand orthosis. Tools from engineering optimization and rapid prototyping techniques were used, with the goal to design a mechanism to compensate for hypertonic or contracted finger muscles. Results show that the mechanism did not reach its design constraints, mostly because it could not provide for the necessary stiffness and compliance at the same time...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813874/effect-of-human-robot-interaction-on-muscular-synergies-on-healthy-people-and-post-stroke-chronic-patients
#11
A Scano, A Chiavenna, M Caimmi, M Malosio, L M Tosatti, F Molteni
Robot-assisted training is a widely used technique to promote motor re-learning on post-stroke patients that suffer from motor impairment. While it is commonly accepted that robot-based therapies are potentially helpful, strong insights about their efficacy are still lacking. The motor re-learning process may act on muscular synergies, which are groups of co-activating muscles that, being controlled as a synergic group, allow simplifying the problem of motor control. In fact, by coordinating a reduced amount of neural signals, complex motor patterns can be elicited...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813700/regenerative-medicine-approaches-for-age-related-muscle-loss-and-sarcopenia-a-mini-review
#12
Juan Diego Naranjo, Jenna L Dziki, Stephen F Badylak
Sarcopenia is a complex and multifactorial disease that includes a decrease in the number, structure and physiology of muscle fibers, and age-related muscle mass loss, and is associated with loss of strength, increased frailty, and increased risk for fractures and falls. Treatment options are suboptimal and consist of exercise and nutrition as the cornerstone of therapy. Current treatment principles involve identification and modification of risk factors to prevent the disease, but these efforts are of limited value to the elderly individuals currently affected by sarcopenia...
August 17, 2017: Gerontology
https://www.readbyqxmd.com/read/28812042/visual-outcomes-24%C3%A2-months-after-laserace
#13
AnnMarie Hipsley, David Hui-Kang Ma, Chi-Chin Sun, Mitchell A Jackson, Daniel Goldberg, Brad Hall
BACKGROUND: To evaluate the effects on near and intermediate visual performance after bilateral Laser Anterior Ciliary Excision (LaserACE) procedure. METHODS: LaserACE surgery was performed using the VisioLite 2.94 μm erbium: yttrium-aluminum-garnet (Er:YAG) ophthalmic laser system in 4 oblique quadrants on the sclera over the ciliary muscle in 3 critical zones of physiological importance (over the ciliary muscles and posterior zonules) with the aim to improve natural dynamic accommodative forces...
2017: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/28811360/involvement-of-midkine-in-the-development-of-pulmonary-fibrosis
#14
Kenichi Misa, Yoshinori Tanino, Xintao Wang, Takefumi Nikaido, Masami Kikuchi, Yuki Sato, Ryuichi Togawa, Mishie Tanino, Shinya Tanaka, Kenji Kadomatsu, Mitsuru Munakata
Midkine is a low-molecular-weight heparin-binding protein that is strongly expressed mainly in the midgestation period and has various physiological activities such as in development and cell migration. Midkine has been reported to be strongly expressed in cancer cells and in inflammation and repair processes, and to be involved in the pathogenesis of various diseases. However, its role in the lung is poorly understood. In this study, we analyzed the clinical characteristics of idiopathic pulmonary fibrosis patients in relation to midkine expression and used a mouse bleomycin-induced pulmonary fibrosis model to investigate the role of midkine in pulmonary fibrosis...
August 2017: Physiological Reports
https://www.readbyqxmd.com/read/28811296/a-novel-d2o-tracer-method-to-quantify-rna-turnover-as-a-biomarker-of-de-novo-ribosomal-biogenesis-in-vitro-in-animal-models-and-in-human-skeletal-muscle
#15
Matthew S Brook, Daniel J Wilkinson, W Kyle Mitchell, Jonathan L Lund, Bethan E Phillips, Nathaniel J Sweczyk, Heikki Kainulainen, Sanna Lensu, Lauren G Koch, Steve L Britton, Paul L Greenhaff, Kenneth Smith, Philip J Atherton
Current methods to quantify RNA dynamics are beset with limitations. Here, we developed a novel stable isotope (D2O)-methodology to quantify RNA synthesis (i.e. ribosomal biogenesis) in cells, animal models, and humans. Firstly, proliferating C2C12 cells were incubated in D2O-enriched media and myotubes (±) 50ng.ml(-1) IGF-1. Secondly, rat quadriceps [untrained n=9; 7-wks interval-"like" training n=13] were collected after ~3-wks D2O (70-Atom%) administration, with body-water enrichment (BWE) monitored via blood sampling...
August 15, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28810996/rhabdomyolysis-after-crawling-military-training
#16
Danit Atias-Varon, Haggai Sherman, Ran Yanovich, Yuval Heled
INTRODUCTION: Rhabdomyolysis is a syndrome characterized by muscle necrosis followed by release of intracellular muscle contents into the circulation. Exertional rhabdomyolysis (ER) occurs in response to nonfamiliar and/or excessive, prolonged, or repetitive exercises, with eccentric characteristics. In military populations, due to the type of intense, all out physical loads, ER is a significant threat, particularly when training under heat stress. However, many other etiologies exist, and clinical presentations vary greatly...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28810121/comparative-proteomic-and-transcriptomic-analysis-of-follistatin-induced-skeletal-muscle-hypertrophy
#17
Caroline Barbé, Fabrice Bray, Marine Gueugneau, Stéphanie Devassine, Pascale Lause, Caroline Tokarski, Christian Rolando, Jean-Paul Thissen
Skeletal muscle, the most abundant body's tissue, plays vital roles in locomotion and metabolism. Myostatin is a negative regulator of skeletal muscle mass. In addition to increase muscle mass, Myostatin inhibition impacts on muscle contractility and energy metabolism. To decipher the mechanisms of action of the Myostatin inhibitors, we used proteomic and transcriptomic approaches to investigate the changes induced in skeletal muscles of transgenic mice overexpressing Follistatin, a physiological Myostatin inhibitor...
August 15, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28807149/muscling-in-on-trp-channels-in-vascular-smooth-muscle-cells-and-cardiomyocytes
#18
REVIEW
Lucía Alonso-Carbajo, Miklos Kecskes, Griet Jacobs, Andy Pironet, Ninda Syam, Karel Talavera, Rudi Vennekens
The human TRP protein family comprises a family of 27 cation channels with diverse permeation and gating properties. The common theme is that they are very important regulators of intracellular Ca(2+) signaling in diverse cell types, either by providing a Ca(2+) influx pathway, or by depolarising the membrane potential, which on one hand triggers the activation of voltage-gated Ca(2+) channels, and on the other limits the driving force for Ca(2+) entry. Here we focus on the role of these TRP channels in vascular smooth muscle and cardiac striated muscle...
September 2017: Cell Calcium
https://www.readbyqxmd.com/read/28807147/trpp2-ion-channels-critical-regulators-of-organ-morphogenesis-in-health-and-disease
#19
REVIEW
Tilman Busch, Michael Köttgen, Alexis Hofherr
Ion channels control the membrane potential and mediate transport of ions across membranes. Archetypical physiological functions of ion channels include processes such as regulation of neuronal excitability, muscle contraction, or transepithelial ion transport. In that regard, transient receptor potential ion channel polycystin 2 (TRPP2) is remarkable, because it controls complex morphogenetic processes such as the establishment of properly shaped epithelial tubules and left-right-asymmetry of organs. The fascinating question of how an ion channel regulates morphogenesis has since captivated the attention of scientists in different disciplines...
September 2017: Cell Calcium
https://www.readbyqxmd.com/read/28804461/the-effect-of-resistance-exercise-on-inflammatory-and-myogenic-markers-in-patients-with-chronic-kidney-disease
#20
Emma L Watson, Joao L Viana, David Wimbury, Naomi Martin, Neil J Greening, Jonathan Barratt, Alice C Smith
Background: Muscle wasting is a common complication of Chronic Kidney Disease (CKD) and is clinically important given its strong association with morbidity and mortality in many other chronic conditions. Exercise provides physiological benefits for CKD patients, however the molecular response to exercise remains to be fully determined. We investigated the inflammatory and molecular response to resistance exercise before and after training in these patients. Methods: This is a secondary analysis of a randomized trial that investigated the effect of 8 week progressive resistance training on muscle mass and strength compared to non-exercising controls...
2017: Frontiers in Physiology
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