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Muscle physiology

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https://www.readbyqxmd.com/read/28646812/oral-consumption-of-vitamin-k2-for-8-weeks-associated-with-increased-maximal-cardiac-output-during-exercise
#1
Brian K McFarlin, Andrea L Henning, Adam S Venable
Background • Vitamin K1 and K2 are not typically common in a Western diet because they are found in a variety of fermented foods. Vitamin K2 in particular has been demonstrated to restore mitochondrial function and has a key role in production of mitochondrial adenosine triphosphate. Thus, it is reasonable to speculate that dietary supplementation with vitamin K2 could increase the function of muscle with high mitochondrial content (ie, skeletal and cardiac muscle). Objective • The purpose of this study was to determine if 8 wk of dietary supplementation with Vitamin K2 could alter cardiovascular responses to a graded cycle ergometer test...
July 2017: Alternative Therapies in Health and Medicine
https://www.readbyqxmd.com/read/28645930/genomic-and-non-genomic-effects-of-androgens-in-the-cardiovascular-system-clinical-implications
#2
REVIEW
Angela K Lucas Herald, Rheure Alves-Lopes, Augusto C Montezano, S Faisal Ahmed, Rhian M Touyz
The principle steroidal androgens are testosterone and its metabolite 5α-dihydrotestosterone (DHT), which is converted from testosterone by the enzyme 5α-reductase. Through the classic pathway with androgens crossing the plasma membrane and binding to the androgen receptor (AR) or via mechanisms independent of the ligand-dependent transactivation function of nuclear receptors, testosterone induces genomic and non-genomic effects respectively. AR is widely distributed in several tissues, including vascular endothelial and smooth muscle cells...
July 1, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28645657/gross-pathology-physiological-and-toxicological-responses-in-relation-to-metals-and-persistent-organic-pollutants-pops-burden-in-tilapia-species-from-ogun-river-nigeria
#3
Oju R Ibor, Aina O Adeogun, Azubuike V Chukwuka, Augustine Arukwe
We have investigated gross pathology, physiological (steroid precursors) and toxicological responses (oxidative stress and phase II biotransformation) in relation to tissue contaminant burden in Tilapia species along the entire length (320 km) of Ogun River, Nigeria. The Ogun River is the longest and largest river in Southwestern Nigeria located along heavily industrialized cities and receives complex mixtures of effluents. A total of 1074 tilapias were collected from three sampling points (Abeokuta, Isheri and Ikorodu) and from an upstream control point (Igboho) and evaluated for gross pathological changes, hepatic transcript levels for oxidative stress and phase II biotransformation responses...
June 8, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28645314/neuromuscular-function-during-knee-extension-exercise-after-cold-water-immersion
#4
Hitoshi Wakabayashi, Titis Wijayanto, Yutaka Tochihara
BACKGROUND: Human adaptability to cold environment has been focused on in the physiological anthropology and related research area. Concerning the human acclimatization process in the natural climate, it is necessary to conduct a research assessing comprehensive effect of cold environment and physical activities in cold. This study investigated the effect of cold water immersion on the exercise performance and neuromuscular function during maximal and submaximal isometric knee extension...
June 23, 2017: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/28644398/a-novel-wearable-forehead-eog-measurement-system-for-human-computer-interfaces
#5
Jeong Heo, Heenam Yoon, Kwang Suk Park
Amyotrophic lateral sclerosis (ALS) patients whose voluntary muscles are paralyzed commonly communicate with the outside world using eye movement. There have been many efforts to support this method of communication by tracking or detecting eye movement. An electrooculogram (EOG), an electro-physiological signal, is generated by eye movements and can be measured with electrodes placed around the eye. In this study, we proposed a new practical electrode position on the forehead to measure EOG signals, and we developed a wearable forehead EOG measurement system for use in Human Computer/Machine interfaces (HCIs/HMIs)...
June 23, 2017: Sensors
https://www.readbyqxmd.com/read/28644076/a-novel-surgical-approach-to-avian-femorotibiotarsal-luxation-repair
#6
Anna E McRee, Thomas N Tully, Javier G Nevarez, Julia Sumner, Anderson Favero da Cunha
A 3-month-old male umbrella cockatoo (Cacatua alba) was presented because of acute non-weight-bearing lameness of the right leg. Marked soft tissue swelling was present around the femorotibiotarsal (stifle) joint, and the radiographic diagnosis was right medial femorotibiotarsal subluxation. Surgical management was elected, and the stifle joint was approached via a lateral parapatellar incision. Joint exploration revealed damage to the lateral meniscus, tendon of origin of the cranial tibial muscle, and cranial cruciate ligament...
June 2017: Journal of Avian Medicine and Surgery
https://www.readbyqxmd.com/read/28644055/regulation-of-transient-receptor-potential-melastatin-4-channel-by-sarcoplasmic-reticulum-inositol-triphosphate-receptors-role-in-human-detrusor-smooth-muscle-function
#7
Aaron Provence, Eric S Rovner, Georgi V Petkov
We recently reported key physiological roles for Ca(2+)-activated transient receptor potential melastatin 4 (TRPM4) channels in detrusor smooth muscle (DSM). However, the Ca(2+)-signaling mechanisms governing TRPM4 channel activity in human DSM cells are unexplored. As the TRPM4 channels are activated by Ca(2+), inositol 1,4,5-trisphosphate receptor (IP3R)-mediated Ca(2+) release from the sarcoplasmic reticulum represents a potential Ca(2+) source for TRPM4 channel activation. We used clinically-characterized human DSM tissues to investigate the molecular and functional interactions of the IP3Rs and TRPM4 channels...
June 23, 2017: Channels
https://www.readbyqxmd.com/read/28643899/lack-of-adaptation-during-prolonged-split-belt-locomotion-in-the-intact-and-spinal-cat
#8
Victoria Kuczynski, Alessandro Telonio, Yann Thibaudier, Marie-France Hurteau, Charline Dambreville, Etienne Desrochers, Adam Doelman, Tayler Ross, Alain Frigon
In humans, gait adapts to prolonged walking on a split-belt treadmill, where one leg steps faster than the other, by gradually restoring the symmetry of interlimb kinematic variables, such as double support periods and step lengths, and by reducing muscle activity (EMG, electromyography). The adaptation is also characterized by reversing the asymmetry of interlimb variables observed during the early split-belt period when returning to tied-belt locomotion, termed an after-effect. To determine if cats adapt to prolonged split-belt locomotion and to assess if spinal locomotor circuits participate in the adaptation, we measured interlimb variables and EMG in intact and spinal-transected cats before, during and after 10 min of split-belt locomotion...
June 23, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28643823/-chewing-on-bruxism-diagnosis-imaging-epidemiology-and-aetiology
#9
F Lobbezoo, R Jacobs, A De Laat, G Aarab, P Wetselaar, D Manfredini
Since the publication of a special issue on bruxism of the NTvT in July 2000, consensus has been reached on bruxism's definition as a repetitive masticatory muscle activity that is characterised by clenching and/or grinding while awake (awake bruxism) or during sleep (sleep bruxism). As yet, however, no consensus exists about the diagnosis of bruxism: sufficient evidence to establish the reliability and validity of the commonly used techniques (self-report, clinical examination, imaging, electromyography, polysomnography) has not yet been produced...
June 2017: Nederlands Tijdschrift Voor Tandheelkunde
https://www.readbyqxmd.com/read/28642969/diverse-metabolic-effects-of-o-glcnacylation-in-the-pancreas-but-limited-effects-in-insulin-sensitive-organs-in-mice
#10
Shogo Ida, Katsutaro Morino, Osamu Sekine, Natsuko Ohashi, Shinji Kume, Tokuhiro Chano, Kanako Iwasaki, Norio Harada, Nobuya Inagaki, Satoshi Ugi, Hiroshi Maegawa
AIMS/HYPOTHESIS: O-GlcNAcylation is characterised by the addition of N-acetylglucosamine to various proteins by O-GlcNAc transferase (OGT) and serves in sensing intracellular nutrients by modulating various cellular processes. Although it has been speculated that O-GlcNAcylation is associated with glucose metabolism, its exact role in whole body glucose metabolism has not been fully elucidated. Here, we investigated whether loss of O-GlcNAcylation globally and in specific organs affected glucose metabolism in mammals under physiological conditions...
June 22, 2017: Diabetologia
https://www.readbyqxmd.com/read/28642261/transforming-growth-factor-beta-stimulates-smad1-5-signaling-in-pulmonary-artery-smooth-muscle-cells-and-fibroblasts-of-the-newborn-mouse-through-alk1
#11
Huili Zhang, Lili Du, Ying Zhong, Kathleen C Flanders, Jesse D Roberts
The intracellular signaling mechanisms through which TGFβ regulates pulmonary development are incompletely understood. Canonical TGFβ signaling involves Smad2/3 phosphorylation, Smad2/3·Smad4 complex formation and nuclear localization, and gene regulation. Here we show that physiologically relevant TGFβ1 levels also stimulate Smad1/5 phosphorylation, typically a mediator of bone morphogenetic protein (BMP) signaling, in mouse pup pulmonary artery smooth muscle cells (mPASMC) and lung fibroblasts and other interstitial lung cell lines...
June 22, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28640448/overview-of-the-muscle-cytoskeleton
#12
Christine A Henderson, Christopher G Gomez, Stefanie M Novak, Lei Mi-Mi, Carol C Gregorio
Cardiac and skeletal striated muscles are intricately designed machines responsible for muscle contraction. Coordination of the basic contractile unit, the sarcomere, and the complex cytoskeletal networks are critical for contractile activity. The sarcomere is comprised of precisely organized individual filament systems that include thin (actin), thick (myosin), titin, and nebulin. Connecting the sarcomere to other organelles (e.g., mitochondria and nucleus) and serving as the scaffold to maintain cellular integrity are the intermediate filaments...
June 18, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28640447/role-of-serca-pump-in-muscle-thermogenesis-and-metabolism
#13
Muthu Periasamy, Santosh Kumar Maurya, Sanjaya Kumar Sahoo, Sushant Singh, Sanjaya Kumar Sahoo, Felipe C G Reis, Naresh Chandra Bal
In muscle cells, the sarcoplasmic reticulum (SR) not only acts as a Ca2+ store, but also regulates the contractile characteristics of the muscle. Ca2+ release from the SR is the primary mechanism for activating muscle contraction and reuptake of Ca2+ by the sarcoplasmic reticulum Ca2+ ATPase (SERCA) pump causes muscle relaxation. The SERCA pump isoforms are encoded by three genes, SERCA 1, 2, and 3, which are differentially expressed in muscle and determine SR Ca2+ dynamics by affecting the rate and amount of Ca2+ uptake, thereby affecting SR store and release of Ca2+ in muscle...
June 18, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28639573/a-transcriptomic-analysis-of-physiological-significance-of-hypoxia-inducible-factor-1%C3%AE-in-myogenesis-and-carbohydrate-metabolism-of-genioglossus-in-mice
#14
Tong Hao, Yue-Hua Liu, Yuan-Yuan Li, Yun Lu, Hong-Yi Xu
BACKGROUND: Chronic intermittent hypoxia is the most remarkable feature of obstructive sleep apnea/hypopnea syndrome and it can induce the change of hypoxia-inducible factor-1α (HIF-1α) expression and contractile properties in the genioglossus. To clarify the role of HIF-1α in contractile properties of the genioglossus, this study generated and compared high-throughput RNA-sequencing data from genioglossus between HIF-1α conditional knockout (KO) mice and littermate wild-type (WT) mice...
July 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28637975/projection-and-synaptic-connectivity-of-trigeminal-mesencephalic-nucleus-neurons-controlling-jaw-reflexes
#15
Atsushi Yoshida, Masayuki Moritani, Yoshitaka Nagase, Yong Chul Bae
Neurons in the trigeminal mesencephalic nucleus (Vmes) receive deep sensation (proprioception) from jaw-closing muscle spindles and periodontal ligaments and project primarily to the jaw-closing motoneuron pool (jaw-closing nucleus) of the trigeminal motor nucleus and to the supratrigeminal nucleus. Numerous articles have described the morphology and physiology of the central projections of Vmes afferents originating from the muscle spindles and periodontal ligaments. However, no report has provided a detailed description of projection and synaptic connectivity, especially of single afferents, and their functional implications...
2017: Journal of Oral Science
https://www.readbyqxmd.com/read/28637676/editorial-focus-on-balance-between-s-nitrosylation-and-denitrosylation-modulates-myoblast-proliferation-independently-of-soluble-guanylyl-cyclase-activation
#16
Hugo P Monteiro, Fernando T Ogata
Myogenesis involves a complex series of signaling events that will result in the formation of muscle fibers. The participation of nitric oxide (NO) in myogenesis is well established. NO generation in skeletal muscle comes from the neuronal isoform of the NO synthase (nNOS). NO signals through cGMP production and s-nitrosylation of proteins in skeletal muscle. In skeletal muscle, nNOS interacts with two domains of caveolin-3 which is part of caveolae, and forms a signaling complex through additional interactions with Src kinase and p21Ras...
June 21, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28637604/cervical-flexion-rotation-test-and-physiological-range-of-motion-a-comparative-study-of-patients-with-myogenic-temporomandibular-disorder-versus-healthy-subjects
#17
Tzvika Greenbaum, Zeevi Dvir, Shoshana Reiter, Ephraim Winocur
BACKGROUND: Temporomandibular Disorders (TMD) refer to several common clinical disorders which involve the masticatory muscles, the temporomandibular joint (TMJ) and the adjacent structures. Although neck signs and symptoms are found with higher prevalence in TMD patients compared to the overall population, whether limitation of cervical mobility is an additional positive finding in this cohort is still an open question. OBJECTIVE: To compare the physiological cervical range of motion (CROM) and the extent of rotation during cervical flexion (flexion-rotation test, FRT) in people with TMD (muscular origin) and healthy control subjects...
February 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28636643/neuromuscular-electrical-stimulation-prevents-skeletal-muscle-dysfunction-in-adjuvant-induced-arthritis-rat
#18
Koichi Himori, Daisuke Tatebayashi, Keita Kanzaki, Masanobu Wada, Håkan Westerblad, Johanna T Lanner, Takashi Yamada
Skeletal muscle weakness is a prominent feature in patients with rheumatoid arthritis (RA). In this study, we investigated whether neuromuscular electrical stimulation (NMES) training protects against skeletal muscle dysfunction in rats with adjuvant-induced arthritis (AIA). AIA was produced by intraarticular injection of complete Freund's adjuvant into the knees of Wistar rats. For NMES training, dorsiflexor muscles were stimulated via a surface electrode (0.5 ms pulse, 50 Hz, 2 s on/4 s off). NMES training was performed every other day for three weeks and consisted of three sets produced at three min intervals...
2017: PloS One
https://www.readbyqxmd.com/read/28636434/selective-breeding-and-short-term-access-to-a-running-wheel-alter-stride-characteristics-in-house-mice
#19
Gerald C Claghorn, Zoe Thompson, Jarren C Kay, Genesis Ordonez, Thomas G Hampton, Theodore Garland
Postural and kinematic aspects of running may have evolved to support high runner (HR) mice to run approximately threefold farther than control mice. Mice from four replicate HR lines selectively bred for high levels of voluntary wheel running show many differences in locomotor behavior and morphology as compared with four nonselected control (C) lines. We hypothesized that HR mice would show stride alterations that have coadapted with locomotor behavior, morphology, and physiology. More specifically, we predicted that HR mice would have stride characteristics that differed from those of C mice in ways that parallel some of the adaptations seen in highly cursorial animals...
September 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28633885/characteristics-of-paraspinal-muscle-spindle-response-to-mechanically-assisted-spinal-manipulation-a-preliminary-report
#20
William R Reed, Joel G Pickar, Randall S Sozio, Michael A K Liebschner, Joshua W Little, Maruti R Gudavalli
OBJECTIVES: The purpose of this preliminary study is to determine muscle spindle response characteristics related to the use of 2 solenoid powered clinical mechanically assisted manipulation (MAM) devices. METHODS: L6 muscle spindle afferents with receptive fields in paraspinal muscles were isolated in 6 cats. Neural recordings were made during L7 MAM thrusts using the Activator V (Activator Methods Int. Ltd., Phoenix, AZ) and/or Pulstar (Sense Technology Inc., Pittsburgh, PA) devices at their 3 lowest force settings...
June 17, 2017: Journal of Manipulative and Physiological Therapeutics
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