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https://www.readbyqxmd.com/read/28930871/reliability-and-measurement-error-of-tensiomyography-to-assess-mechanical-muscle-function-a-systematic-review
#1
Saúl Martín-Rodríguez, Irineu Loturco, Angus M Hunter, David Rodríguez-Ruiz, Diego Munguia-Izquierdo
Interest in studying mechanical skeletal muscle function through tensiomyography (TMG) has increased in recent years. This systematic review aimed to (a) report the reliability and measurement error of all TMG parameters [i.e., maximum radial displacement of the muscle belly (Dm), contraction time (Tc), delay time (Td), half-relaxation time (½ Tr), and sustained contraction time (Ts)] and (b) to provide critical reflection on how to perform accurate and appropriate measurements for informing clinicians, exercise professionals, and researchers...
September 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28930190/oligonol-a-low-molecular-weight-polyphenol-derived-from-lychee-alleviates-muscle-loss-in-diabetes-by-suppressing-atrogin-1-and-murf1
#2
Hung-Wen Liu, Yen-Ju Chen, Yun-Ching Chang, Sue-Joan Chang
Stimulation of the ubiquitin-proteasome pathway-especially E3 ubiquitin ligases Atrogin-1 and MuRF1-is associated with muscle loss in diabetes. Elevated lipid metabolites impair myogenesis. Oligonol, a low molecular weight polyphenol derived from lychee, exhibited anti-diabetic and anti-obesity properties, suggesting it could be a proper supplement for attenuating muscle loss. Dietary (10 weeks) oligonol supplementation (20 or 200 mg/kg diet) on the skeletal muscle loss was investigated in diabetic db/db mice...
September 20, 2017: Nutrients
https://www.readbyqxmd.com/read/28929630/muscle-length-matters-new-insights-into-the-neural-control-of-lengthening-muscle-actions-of-the-knee-extensors
#3
Martin Behrens
Every movement of the human organism requires an interaction of the central nervous system and skeletal muscles to generate muscle actions and thereby joint torques. This article is protected by copyright. All rights reserved.
September 20, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28928419/the-histone-deacetylase-sirt6-blocks-myostatin-expression-and-development-of-muscle-atrophy
#4
Sadhana A Samant, Abhinav Kanwal, Vinodkumar B Pillai, Riyue Bao, Mahesh P Gupta
Muscle wasting, also known as cachexia, is associated with many chronic diseases, which worsens prognosis of primary illness leading to enhanced mortality. Molecular basis of this metabolic syndrome is not yet completely understood. SIRT6 is a chromatin-bound member of the sirtuin family, implicated in regulating many cellular processes, ranging from metabolism, DNA repair to aging. SIRT6 knockout (SIRT6-KO) mice display loss of muscle, fat and bone density, typical characteristics of cachexia. Here we report that SIRT6 depletion in cardiac as well as skeletal muscle cells promotes myostatin (Mstn) expression...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28927901/age-related-reductions-in-muscle-quality-influence-the-relative-differences-in-strength-and-power
#5
Gena R Gerstner, Hayden K Giuliani, Jacob A Mota, Eric D Ryan
Age-related changes in the relative differences in isokinetic strength and power may reflect fast twitch fiber function. We aimed to examine the influence of muscle quality on the relative differences in strength and power in younger and older men. Twenty younger (20.1±1.5yrs) and 20 older (69.5±3.1yrs) healthy, recreationally active men performed two plantarflexion maximal voluntary isometric contractions (MVCs) and three maximal concentric isokinetic contractions at a slow (0.52rad·s(-1)) and fast (2.09rad·s(-1)) velocity...
September 16, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28927770/-pyomyositis-in-children-two-cases-of-staphylococcus-aureus-infection
#6
F Gravot, J Hébert, A Robert-Dehault, R Bouttier, F Le Gall, G Blondin, P Vic
Pyomyositis is a term used to denote primary pyogenic infection of a skeletal muscle. It is a rare disease that was first described in immunodeficient patients living in tropical climates. Lately, however, cases involving healthy children have been described in temperate climates. The origin of primary pyomyositis remains unclear, although it is thought to be caused by seeding from transient bacteremia. Onset of disease is insidious, therefore necessitating rapid diagnosis to successfully select appropriate antibiotic therapy and avoid complications...
September 15, 2017: Archives de Pédiatrie: Organe Officiel de la Sociéte Française de Pédiatrie
https://www.readbyqxmd.com/read/28926107/fenofibrate-reverses-changes-induced-by-high-fat-diet-on-metabolism-in-mice-muscle-and-visceral-adipocytes
#7
Flávia de Toledo Frias, Karina Cunha E Rocha, Mariana de Mendonça, Gilson Massahiro Murata, Hygor Nunes Araujo, Luís Gustavo Oliveira de Sousa, Érica de Souza, Sandro Massao Hirabara, Nayara de Carvalho Leite, Everardo Magalhães Carneiro, Rui Curi, Leonardo Reis Silveira, Alice Cristina Rodrigues
The effect of fenofibrate on the metabolism of skeletal muscle and visceral white adipose tissue of diet-induced obese (DIO) mice was investigated. C57BL/6J male mice were fed either a control or high-fat diet for eight weeks. Fenofibrate (50 mg/Kg b.w., daily) was administered by oral gavage during the last two weeks of the experimental period. Insulin-stimulated glucose metabolism in soleus muscles, glucose tolerance test, insulin tolerance test, indirect calorimetry, lipolysis of visceral white adipose tissue, expression of miR-103-3p in adipose tissue and miR-1a, miR-133a/b, miR-206, let7b-5p, miR-23b-3p, miR-29-3p, miR-143-3p in soleus muscle, genes related to glucose and fatty acid metabolism in adipose tissue and soleus muscle, and proteins (phospho-AMPKα2, Pgc1α, Cpt1b), intramuscular lipid staining, and activities of fatty acid oxidation enzymes in skeletal muscle were investigated...
September 19, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28925476/late-onset-pompe-disease-in-a-54-year-old-sportsman-with-an-episode-of-syncope-a-case-report
#8
M Walczak-Galezewska, D Skrypnik, M Szulinska, K Musialik, K Skrypnik, P Bogdanski
Pompe disease is an extra-rare metabolic storage disease with deficiency of acid-alpha-glucosidase (GAA) enzyme activity, which leads to the pathologic accumulation of glycogen in target tissues (skeletal muscles, heart, brain). Clinical features and severity vary by the age of onset, rate of extent of organ involvement. In the late-onset Pompe disease (LOPD) form, essential cardiomyopathy seems to be uncommon. Muscles weakness and respiratory failure are the main symptoms of adult patient with Pompe disease...
August 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28924252/comprehensive-analysis-of-lncrnas-and-mrnas-in-skeletal-muscle-of-rainbow-trout-oncorhynchus-mykiss-exposed-to-estradiol
#9
Jian Wang, Prasanthi P Koganti, Jianbo Yao, Shuo Wei, Beth Cleveland
Estradiol (E2) is a steroid hormone that negatively affects muscle growth in rainbow trout (Oncorhynchus mykiss), but the mechanisms directing with this response are not fully understood. To better characterize the effects of E2 in muscle, we identified differentially regulated mRNAs and lncRNAs in juvenile rainbow trout exposed to E2. Here, we performed next-generation RNA sequencing and comprehensive bioinformatics analyses to characterize the transcriptome profiles, including mRNAs and long noncoding RNAs (lncRNAs), in skeletal muscle of rainbow trout injected with E2...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28924247/low-level-activity-thresholds-for-changes-in-nmr-biomarkers-and-genes-in-high-risk-subjects-for-type-2-diabetes
#10
Karl-Heinz Herzig, Juhani Leppäluoto, Jari Jokelainen, Emmanuelle Meugnier, Sandra Pesenti, Harri Selänne, Kari A Mäkelä, Riikka Ahola, Timo Jämsä, Hubert Vidal, Sirkka Keinänen-Kiukaanniemi
Our objectives were to determine if there are quantitative associations between amounts and intensities of physical activities (PA) on NMR biomarkers and changes in skeletal muscle gene expressions in subjects with high risk for type 2 diabetes (T2D) performing a 3-month PA intervention. We found that PA was associated with beneficial biomarker changes in a factor containing several VLDL and HDL subclasses and lipids in principal component analysis (P = <0.01). Division of PA into quartiles demonstrated significant changes in NMR biomarkers in the 2nd - 4th quartiles compared to the 1st quartile representing PA of less than 2850 daily steps (P = 0...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28923931/endothelial-insulin-receptors-differentially-control-insulin-signaling-kinetics-in-peripheral-tissues-and-brain-of-mice
#11
Masahiro Konishi, Masaji Sakaguchi, Samuel M Lockhart, Weikang Cai, Mengyao Ella Li, Erica P Homan, Christian Rask-Madsen, C Ronald Kahn
Insulin receptors (IRs) on endothelial cells may have a role in the regulation of transport of circulating insulin to its target tissues; however, how this impacts on insulin action in vivo is unclear. Using mice with endothelial-specific inactivation of the IR gene (EndoIRKO), we find that in response to systemic insulin stimulation, loss of endothelial IRs caused delayed onset of insulin signaling in skeletal muscle, brown fat, hypothalamus, hippocampus, and prefrontal cortex but not in liver or olfactory bulb...
September 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28923841/a-novel-notch-yap-circuit-drives-stemness-and-tumorigenesis-in-embryonal-rhabdomyosarcoma
#12
Katherine K Slemmons, Lisa E S Crose, Stefan Riedel, Manuela Sushnitha, Brian C Belyea, Corinne M Linardic
Rhabdomyosarcoma (RMS), a cancer characterized by skeletal muscle features, is the most common soft tissue sarcoma of childhood. While low and intermediate-risk groups have seen improved outcomes, high-risk patients still face a 5-year survival of <30%, a statistic that has not changed in over 40 years. Understanding the biologic underpinnings of RMS is critical. The developmental pathways of Notch and YAP have been identified as potent but independent oncogenic signals that support the embryonal variant of RMS (eRMS)...
September 18, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28921743/exercise-training-dose-differentially-alters-muscle-and-heart-capillary-density-and-metabolic-functions-in-an-obese-rat-with-metabolic-syndrome
#13
Marcus Vinicius Machado, Aline Bomfim Vieira, Fabiana Gomes da Conceição, Alessandro Rodrigues Nascimento, Antonio Claudio Lucas da Nóbrega, Eduardo Tibirica
We evaluated the effect of frequency, duration and intensity of exercise training on metabolic parameters and structural capillary density in obese rats with metabolic syndrome (MS). Wistar-Kyoto rats were fed a either standard commercial diet (CON) or high-fat diet (HFD). Animals that received the HFD were randomly separated into either a sedentary (SED) group or 8 different exercise groups that varied by the frequency, duration and intensity of training. After 12 weeks of aerobic exercise training, body composition, aerobic capacity, hemodynamic variables, metabolic parameters and capillary density in the heart and skeletal muscle were evaluated...
September 17, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28921683/corticospinal-responses-following-strength-training-a-systematic-review-and-meta-analysis
#14
REVIEW
Dawson J Kidgell, Daniel R Bonanno, Ashlyn K Frazer, Glyn Howatson, Alan J Pearce
Strength-training results in changes in skeletal muscle, however, changes in the central nervous system also occur. Over the last 15 years, non-invasive brain stimulation techniques, such as transcranial magnetic stimulation, have been used to study the neural adaptations to strength-training. This review explored the hypothesis that the neural adaptations to strength-training may be due to changes in corticospinal excitability and inhibition and, such changes, contribute to the gain in strength following strength-training...
September 18, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28920922/g%C3%AE-13-ablation-reprograms-myofibers-to-oxidative-phenotype-and-enhances-whole-body-metabolism
#15
Ja Hyun Koo, Tae Hyun Kim, Shi-Young Park, Min Sung Joo, Chang Yeob Han, Cheol Soo Choi, Sang Geon Kim
Skeletal muscle is a key organ in energy homeostasis owing to its high requirement for nutrients. Heterotrimeric G proteins converge signals from cell-surface receptors to potentiate or blunt responses against environmental changes. Here, we show that muscle-specific ablation of Gα13 in mice promotes reprogramming of myofibers to the oxidative type, with resultant increases in mitochondrial biogenesis and cellular respiration. Mechanistically, Gα13 and its downstream effector RhoA suppressed nuclear factor of activated T cells 1 (NFATc1), a chief regulator of myofiber conversion, by increasing Rho-associated kinase 2-mediated (Rock2-mediated) phosphorylation at Ser243...
September 18, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28920852/experimental-transmission-to-a-calf-of-an-isolate-of-spanish-classical-scrapie
#16
Rosa Bolea, Carlos Hedman, Óscar López-Pérez, Belén Marín, Enríc Vidal, Martí Pumarola, Fabien Corbière, Antonio Romero, Bernardino Moreno, Inmaculada Martín-Burriel, Olivier Andréoletti, Juan José Badiola
Multiple theories exist regarding the origin of bovine spongiform encephalopathy (BSE). An early and prominent theory proposed that BSE was the result of the adaptation of sheep scrapie to cattle. The reports to date indicate that the distribution of the pathological prion protein (PrPSc) in experimental bovine scrapie is largely restricted to the central nervous system (CNS). Here, we describe pathological findings in a calf intracerebrally inoculated with a Spanish classical scrapie isolate. While clinical disease was observed 30 months after inoculation and PrPSc was detected in the CNS, the corresponding phenotype differed from that of BSE...
September 18, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28920458/nordic-walking-increases-circulating-vegf-more-than-traditional-walking-training-in-postmenopause
#17
P Izzicupo, M A D'Amico, A Di Blasio, G Napolitano, A Di Baldassarre, B Ghinassi
OBJECTIVES: Nordic walking (NW) is widely practiced by postmenopausal women. Its effects are peculiar owing to the involvement of more muscle groups than in traditional walking training (WT). Since mechanical load promotes secretion of vascular endothelial growth factor (VEGF) from both skeletal muscle and muscle endothelium, the aim of the study was to compare the effect of NW and WT on VEGF levels. METHOD: Thirty postmenopausal women were randomly assigned to NW or WT...
September 17, 2017: Climacteric: the Journal of the International Menopause Society
https://www.readbyqxmd.com/read/28919880/non-mammalian-vertebrates-distinct-models-to-assess-the-role-of-ion-gradients-in-energy-expenditure
#18
REVIEW
Caroline E Geisler, Kyle P Kentch, Benjamin J Renquist
Animals store metabolic energy as electrochemical gradients. At least 50% of mammalian energy is expended to maintain electrochemical gradients across the inner mitochondrial membrane (H(+)), the sarcoplasmic reticulum (Ca(++)), and the plasma membrane (Na(+)/K(+)). The potential energy of these gradients can be used to perform work (e.g., transport molecules, stimulate contraction, and release hormones) or can be released as heat. Because ectothermic species adapt their body temperature to the environment, they are not constrained by energetic demands that are required to maintain a constant body temperature...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28919865/coping-with-salt-water-habitats-metabolic-and-oxidative-responses-to-salt-intake-in-the-rufous-collared-sparrow
#19
Pablo Sabat, Cristóbal Narváez, Isaac Peña-Villalobos, Carolina Contreras, Karin Maldonado, Juan C Sanchez-Hernandez, Seth D Newsome, Roberto Nespolo, Francisco Bozinovic
Many physiological adjustments occur in response to salt intake in several marine taxa, which manifest at different scales from changes in the concentration of individual molecules to physical traits of whole organisms. Little is known about the influence of salinity on the distribution, physiological performance, and ecology of passerines; specifically, the impact of drinking water salinity on the oxidative status of birds has been largely ignored. In this study, we evaluated whether experimental variations in the salt intake of a widely-distributed passerine (Zontotrichia capensis) could generate differences in basal (BMR) and maximum metabolic rates (Msum), as well as affect metabolic enzyme activity and oxidative status...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28919162/mir-101-1-expression-pattern-in-qinchuan-cattle-and-its-role-in-the-regulation-of-cell-differentiation
#20
Jiyao Wu, Dandan He, Binglin Yue, Chunlei Zhang, Xingtang Fang, Hong Chen
MiRNAs have emerged as key regulators of skeletal muscle development, but the knowledge of miRNAs in the molecular network of muscle development remains poorly understood. In this study, we designed to examine the biological function of bovine-miR-101-1. The bovine miR-101-1 was detected in the skeletal muscle of fetal, calf and adult cattle. Its abundance was significantly higher in the skeletal muscle of calf cattle than that in fetal and adult cattle. In the course of C2C12 myoblast differentiation, the expression of miR-101-1 gradually increased...
September 14, 2017: Gene
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