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Muscular hypertrophy

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https://www.readbyqxmd.com/read/28725197/skeletal-muscle-remodeling-in-response-to-eccentric-vs-concentric-loading-morphological-molecular-and-metabolic-adaptations
#1
REVIEW
Martino V Franchi, Neil D Reeves, Marco V Narici
Skeletal muscle contracts either by shortening or lengthening (concentrically or eccentrically, respectively); however, the two contractions substantially differ from one another in terms of mechanisms of force generation, maximum force production and energy cost. It is generally known that eccentric actions generate greater force than isometric and concentric contractions and at a lower metabolic cost. Hence, by virtue of the greater mechanical loading involved in active lengthening, eccentric resistance training (ECC RT) is assumed to produce greater hypertrophy than concentric resistance training (CON RT)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28713535/strength-training-with-repetitions-to-failure-does-not-provide-additional-strength-and-muscle-hypertrophy-gains-in-young-women
#2
Saulo Martorelli, Eduardo Lusa Cadore, Mikel Izquierdo, Rodrigo Celes, André Martorelli, Vitor Alonso Cleto, José Gustavo Alvarenga, Martim Bottaro
This study investigated the effects of a 10-week resistance training to failure on neuromuscular adaptations in young women. Eighty-nine active young women were randomly assigned to one of three groups: 1) repetitions to failure (RF; three sets of repetitions to failure); 2) repetitions not to failure with equalized volume (RNFV; four sets of 7 repetitions); and 3) repetitions not to failure (RNF; three sets of 7 repetitions). All groups performed the elbow flexor exercise (bilateral biceps curl) and trained 2 days per week using 70% of 1RM...
June 24, 2017: European Journal of Translational Myology
https://www.readbyqxmd.com/read/28686688/therapeutic-impact-of-dietary-vitamin-d-supplementation-for-preventing-right-ventricular-remodeling-and-improving-survival-in-pulmonary-hypertension
#3
Hiroaki Tanaka, Masaharu Kataoka, Sarasa Isobe, Tsunehisa Yamamoto, Kohsuke Shirakawa, Jin Endo, Toru Satoh, Yoji Hakamata, Eiji Kobayashi, Motoaki Sano, Keiichi Fukuda
BACKGROUND: Pulmonary hypertension (PH), caused by elevated pulmonary vascular resistance, leads to right heart failure and ultimately death. Vitamin D deficiency can predispose individuals to hypertension and left ventricular dysfunction; however, it remains unknown how serum vitamin D level is related to PH and right ventricular (RV) dysfunction. METHODS: Serum 25-hydroxyvitamin D [25(OH)D] levels were assessed in PH patients for an association with disease severity...
2017: PloS One
https://www.readbyqxmd.com/read/28673252/comparative-muscle-transcriptome-associated-with-carcass-traits-of-nellore-cattle
#4
Bárbara Silva-Vignato, Luiz L Coutinho, Aline S M Cesar, Mirele D Poleti, Luciana C A Regitano, Júlio C C Balieiro
BACKGROUND: Commercial cuts yield is an important trait for beef production, which affects the final value of the products, but its direct determination is a challenging procedure to be implemented in practice. The measurement of ribeye area (REA) and backfat thickness (BFT) can be used as indirect measures of meat yield. REA and BFT are important traits studied in beef cattle due to their strong implication in technological (carcass yield) and nutritional characteristics of meat products, like the degree of muscularity and total body fat...
July 3, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28666030/contribution-of-reactive-oxygen-species-to-the-pathogenesis-of-pulmonary-arterial-hypertension
#5
Nikki L Jernigan, Jay S Naik, Laura Weise-Cross, Neil D Detweiler, Lindsay M Herbert, Tracylyn R Yellowhair, Thomas C Resta
Pulmonary arterial hypertension is associated with a decreased antioxidant capacity. However, neither the contribution of reactive oxygen species to pulmonary vasoconstrictor sensitivity, nor the therapeutic efficacy of antioxidant strategies in this setting are known. We hypothesized that reactive oxygen species play a central role in mediating both vasoconstrictor and arterial remodeling components of severe pulmonary arterial hypertension. We examined the effect of the chemical antioxidant, TEMPOL, on right ventricular systolic pressure, vascular remodeling, and enhanced vasoconstrictor reactivity in both chronic hypoxia and hypoxia/SU5416 rat models of pulmonary hypertension...
2017: PloS One
https://www.readbyqxmd.com/read/28638346/micrornas-in-muscle-characterizing-the-powerlifter-phenotype
#6
Randall F D'Souza, Thomas Bjørnsen, Nina Zeng, Kirsten M M Aasen, Truls Raastad, David Cameron-Smith, Cameron J Mitchell
Powerlifters are the epitome of muscular adaptation and are able to generate extreme forces. The molecular mechanisms underpinning the significant capacity for force generation and hypertrophy are not fully elucidated. MicroRNAs (miRs) are short non-coding RNA sequences that control gene expression via promotion of transcript breakdown and/or translational inhibition. Differences in basal miR expression may partially account for phenotypic differences in muscle mass and function between powerlifters and untrained age-matched controls...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28637880/a-study-comparing-vein-integrity-and-clinical-outcomes-vico-in-open-vein-harvesting-and-two-types-of-endoscopic-vein-harvesting-for-coronary-artery-bypass-grafting-the-vico-randomised-clinical-trial
#7
Bhuvaneswari Krishnamoorthy, William R Critchley, Alexander J Thompson, Katherine Payne, Julie Morris, Rajamiyer V Venkateswaran, Ann L Caress, James E Fildes, Nizar Yonan
Background -Current consensus statements maintain that endoscopic vein harvesting (EVH) should be standard care in coronary artery bypass surgery (CABG) but vein quality and clinical outcomes have been questioned. The Vein Integrity and Clinical Outcome (VICO) trial was designed to assess the impact of different vein harvesting methods on vessel damage and if this contributes to clinical outcomes following CABG. Methods -A single centre, randomised clinical trial of patients undergoing CABG with an internal mammary artery, and with one to four vein grafts were recruited...
June 21, 2017: Circulation
https://www.readbyqxmd.com/read/28617715/strength-and-muscular-adaptations-following-6-weeks-of-rest-pause-versus-traditional-multiple-sets-resistance-training-in-trained-subjects
#8
Jonato Prestes, Ramires Alsamir Tibana, Eduardo de Araujo Sousa, Dahan da Cunha Nascimento, Pollyanna de Oliveira Rocha, Nathalia Ferreira Camarço, Nuno Manuel Frade de Sousa, Jeffrey M Willardson
The purpose of the present study was to compare the longitudinal effects of six weeks of rest-pause versus traditional multiple-set RT on muscle strength, hypertrophy, localized muscular endurance, and body composition in trained subjects. Eighteen trained subjects (mean ± SD; age = 30.2 ± 6.6 years; weight = 74.8 ± 17.2 kg; height = 171.4 ± 10.3 cm) were randomly assigned to either a traditional multiple-set group (n = 9; 7 males and 2 females; 3 sets of 6 repetitions with 80% of 1-RM and 2 min rest intervals between sets) or a rest-pause group (n = 9; 7 males and 2 females)...
April 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28607086/specific-targeting-of-tgf-%C3%AE-family-ligands-demonstrates-distinct-roles-in-the-regulation-of-muscle-mass-in-health-and-disease
#9
Justin L Chen, Kelly L Walton, Adam Hagg, Timothy D Colgan, Katharine Johnson, Hongwei Qian, Paul Gregorevic, Craig A Harrison
The transforming growth factor-β (TGF-β) network of ligands and intracellular signaling proteins is a subject of intense interest within the field of skeletal muscle biology. To define the relative contribution of endogenous TGF-β proteins to the negative regulation of muscle mass via their activation of the Smad2/3 signaling axis, we used local injection of adeno-associated viral vectors (AAVs) encoding ligand-specific antagonists into the tibialis anterior (TA) muscles of C57BL/6 mice. Eight weeks after AAV injection, inhibition of activin A and activin B signaling produced moderate (∼20%), but significant, increases in TA mass, indicating that endogenous activins repress muscle growth...
June 27, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28603219/central-hemodynamics-for-management-of-arteriosclerotic-diseases
#10
Junichiro Hashimoto
Arteriosclerosis, particularly aortosclerosis, is the most critical risk factor associated with cardiovascular, cerebrovascular, and renal diseases. The pulsatile hemodynamics in the central aorta consists of blood pressure, flow, and stiffness and substantially differs from the peripheral hemodynamics in muscular arteries. Arteriosclerotic changes with age appear earlier in the elastic aorta, and age-dependent increases in central pulse pressure are more marked than those apparent from brachial pressure measurement...
June 10, 2017: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/28594869/compound-heterozygous-mutations-in-glycyl-trna-synthetase-gars-cause-mitochondrial-respiratory-chain-dysfunction
#11
Michael Nafisinia, Lisa G Riley, Wendy A Gold, Kaustuv Bhattacharya, Carolyn R Broderick, David R Thorburn, Cas Simons, John Christodoulou
Glycyl-tRNA synthetase (GARS; OMIM 600287) is one of thirty-seven tRNA-synthetase genes that catalyses the synthesis of glycyl-tRNA, which is required to insert glycine into proteins within the cytosol and mitochondria. To date, eighteen mutations in GARS have been reported in patients with autosomal-dominant Charcot-Marie-Tooth disease type 2D (CMT2D; OMIM 601472), and/or distal spinal muscular atrophy type V (dSMA-V; OMIM 600794). In this study, we report a patient with clinical and biochemical features suggestive of a mitochondrial respiratory chain (MRC) disorder including mild left ventricular posterior wall hypertrophy, exercise intolerance, and lactic acidosis...
2017: PloS One
https://www.readbyqxmd.com/read/28587894/burrowing-as-a-novel-voluntary-strength-training-method-for-mice-a-comparison-of-various-voluntary-strength-or-resistance-exercise-methods
#12
P Roemers, P N Mazzola, P P De Deyn, W J Bossers, M J G van Heuvelen, E A van der Zee
BACKGROUND: Voluntary strength training methods for rodents are necessary to investigate the effects of strength training on cognition and the brain. However, few voluntary methods are available. NEW METHOD: The current study tested functional and muscular effects of two novel voluntary strength training methods, burrowing (digging a substrate out of a tube) and unloaded tower climbing, in male C57Bl6 mice. To compare these two novel methods with existing exercise methods, resistance running and (non-resistance) running were included...
June 3, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28581498/dystrophin-glycoprotein-complex-sequesters-yap-to-inhibit-cardiomyocyte-proliferation
#13
Yuka Morikawa, Todd Heallen, John Leach, Yang Xiao, James F Martin
The regenerative capacity of the adult mammalian heart is limited, because of the reduced ability of cardiomyocytes to progress through mitosis. Endogenous cardiomyocytes have regenerative capacity at birth but this capacity is lost postnatally, with subsequent organ growth occurring through cardiomyocyte hypertrophy. The Hippo pathway, a conserved kinase cascade, inhibits cardiomyocyte proliferation in the developing heart to control heart size and prevents regeneration in the adult heart. The dystrophin-glycoprotein complex (DGC), a multicomponent transmembrane complex linking the actin cytoskeleton to extracellular matrix, is essential for cardiomyocyte homeostasis...
July 13, 2017: Nature
https://www.readbyqxmd.com/read/28577964/rp5063-a-novel-multimodal-serotonin-receptor-modulator-prevents-monocrotaline-induced-pulmonary-arterial-hypertension-in-rats
#14
Laxminarayan Bhat, Jon Hawkinson, Marc Cantillon, Dasharatha G Reddy, Seema R Bhat, Charles E Laurent, Annie Bouchard, Marzena Biernat, Dany Salvail
Pulmonary arterial hypertension (PAH), a condition characterized by pulmonary vasculature constriction and remodeling, involves dysregulation of the serotonin (5-HT) receptors 5-HT2A and 5-HT2B. A rat model of monocrotaline (MCT)-induced PAH was used to examine the potential beneficial effects of RP5063, a 5-HT receptor modulator. After a single 60mg/kg dose of MCT, rats were gavaged twice-daily (b.i.d.) with vehicle, RP5063 (1, 3, or 10mg/kg), or sildenafil (50mg/kg) for 28 days. RP5063 at a dose as low as 1mg/kg, b...
May 31, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28576279/-atypical-reaction-to-anesthesia-in-duchenne-becker-muscular-dystrophy
#15
Helga Cristina Almeida da Silva, Marcia Hiray, Mariz Vainzof, Beny Schmidt, Acary Souza Bulle Oliveira, José Luiz Gomes do Amaral
BACKGROUND AND OBJECTIVES: Duchenne/Becker muscular dystrophy affects skeletal muscles and leads to progressive muscle weakness and risk of atypical anesthetic reactions following exposure to succinylcholine or halogenated agents. The aim of this report is to describe the investigation and diagnosis of a patient with Becker muscular dystrophy and review the care required in anesthesia. CASE REPORT: Male patient, 14 years old, referred for hyperCKemia (chronic increase of serum creatine kinase levels - CK), with CK values of 7,779-29,040IU...
May 30, 2017: Revista Brasileira de Anestesiologia
https://www.readbyqxmd.com/read/28530448/carbohydrates-alone-or-mixing-with-beef-or-whey-protein-promote-similar-training-outcomes-in-resistance-training-males-a-double-blind-randomized-controlled-clinical-trial
#16
Fernando Naclerio, Marco Seijo-Bujia, Eneko Larumbe-Zabala, Conrad P Earnest
Beef powder is a new high-quality protein source scarcely researched relative to exercise performance. The present study examined the impact of ingesting hydrolyzed beef protein, whey protein, and carbohydrate on strength performance (1RM), body composition (via plethysmography), limb circumferences and muscular thickness (via ultrasonography), following an 8-week resistance-training program. After being randomly assigned to one of the following groups: Beef, Whey, or Carbohydrate, twenty four recreationally physically active males (n=8 per treatment) ingested 20 g of supplement, mixed with orange juice, once a day (immediately after workout or before breakfast)...
May 22, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28526870/time-course-responses-of-circulating-micrornas-to-three-resistance-training-protocols-in-healthy-young-men
#17
Shufang Cui, Biao Sun, Xin Yin, Xia Guo, Dingming Chao, Chunni Zhang, Chen-Yu Zhang, Xi Chen, Jizheng Ma
Circulating microRNAs (c-miRNAs) in human plasma have been described as a potential marker of exercise. The present study investigated the effects of three acute resistance training (RT) protocols on the time-course changes of the c-miRNAs profiles in young males. The subjects (n = 45) were randomly divided into three groups: muscular strength endurance (SE), muscular hypertrophy (MH) and maximum strength (MS). Venous blood samples were obtained before exercise and immediately, 1 h and 24 h after each RT protocol to assess the following biological parameters: c-miRNAs, anabolic and catabolic hormones, inflammatory cytokines and muscle damage markers...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28523323/discovery-of-a-new-mutation-in-the-desmin-gene-in-a-young-patient-with-cardiomyopathy-and-muscular-weakness
#18
Ruxandra Oana JurcuŢ, Alexandra Eugenia Bastian, Sebastian Militaru, Aura Popa, Emilia Manole, Bogdan Alexandru Popescu, Jonna Tallila, Bogdan Ovidiu Popescu, Carmen Doina Ginghină
A 25-year-old woman with a five years history of syncope, mild left ventricular hypertrophy and moderately enlarged atria, was diagnosed with third degree atrioventricular heart block alternating with atrioventricular heart block 2:1, and received a dual chamber pacemaker. After three years of evolution, she developed atrial fibrillation, marked biatrial enlargement, severely depressed longitudinal myocardial velocities, associated with mild girdle weakness and slight increase in creatine kinase level. The diagnosis of restrictive cardiomyopathy with mild skeletal myopathy imposed the screening for a common etiology...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28513326/the-effects-of-blood-flow-restricted-electrostimulation-on-strength-hypertrophy
#19
Joshua Slysz, Jamie F Burr
CONTEXT: The combined effect of neuromuscular electrical muscle stimulation (NMES) and blood flow restriction (BFR) on muscle mass and strength has not been thoroughly investigated. OBJECTIVE: To examine the effects of combined and independent BFR and a low-intensity NMES on skeletal muscle adaptation. DESIGN: Exploratory Study. SETTING: Laboratory. PARTICIPANTS: Twenty recreationally active subjects...
May 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28480792/a-rare-presentation-of-meralgia-paraesthetica-in-limb-girdle-muscular-dystrophy
#20
Ozgur Zeliha Karaahmet, Eda Gurcay, Duygu Ozturk, Sukran Guzel, Aytul Cakci
A 44-year-old female with paraesthesia and pain on the left anterolateral thigh who had been diagnosed with limb-girdle muscular dystrophy by electromyography and muscle biopsy is presented. Neurological examination revealed atrophy of the proximal muscles of both shoulders, plus pseudo hypertrophy of both calves. Electromyography exhibited a myopathic pattern. Musculoskeletal ultrasound imaging demonstrated a fusiform nerve swelling below the inguinal ligament suggesting lateral femoral cutaneous nerve compression, consistent with meralgia paraesthetica...
January 1, 2017: Scottish Medical Journal
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