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Muscular hypertrophy

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https://www.readbyqxmd.com/read/29658408/the-compatibility-of-concurrent-high-intensity-interval-training-and-resistance-training-for-muscular-strength-and-hypertrophy-a-systematic-review-and-meta-analysis
#1
Angelo Sabag, Abdolrahman Najafi, Scott Michael, Tuguy Esgin, Mark Halaki, Daniel Hackett
The purpose of this systematic review and meta-analysis is to assess the effect of concurrent high intensity interval training (HIIT) and resistance training (RT) on strength and hypertrophy. Five electronic databases were searched using terms related to HIIT, RT, and concurrent training. Effect size (ES), calculated as standardised differences in the means, were used to examine the effect of concurrent HIIT and RT compared to RT alone on muscle strength and hypertrophy. Sub-analyses were performed to assess region-specific strength and hypertrophy, HIIT modality (cycling versus running), and inter-modal rest responses...
April 16, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29652692/potential-roles-of-vascular-endothelial-growth-factor-during-skeletal-muscle-hypertrophy
#2
Kimberly A Huey
Vascular endothelial growth factor (VEGF) deletion in adult mouse muscle fibers contributes to impaired contractile and muscular adaptations to a hypertrophic stimulus suggesting a critical role in adult muscle growth. This review will explore the hypothesis that VEGF is essential for adult muscle growth by impacting inflammatory processes, satellite-endothelial cell interactions, and contractile protein accumulation by functioning within known hypertrophic signaling pathways including insulin-like growth factor-1 (IGF-1-Akt) and Wnt-ß-catenin...
April 12, 2018: Exercise and Sport Sciences Reviews
https://www.readbyqxmd.com/read/29619802/improving-muscular-strength-and-hypertrophy-are-we-following-the-right-scientific-way
#3
Marcos D Polito
No abstract text is available yet for this article.
April 4, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29577809/spectrum-of-neuromuscular-disorders-with-hyperckemia-from-a-tertiary-care-pediatric-neuromuscular-center
#4
Fouad Al-Ghamdi, Basil T Darras, Partha S Ghosh
Elevated creatine kinase is a useful screening test in the diagnostic workup of patients with neuromuscular disorders. We did a retrospective study of children with hyperCKemia (>175 IU/L) who were followed in the neuromuscular program of a tertiary care pediatric center from 2005 to 2016. Patients with hyperCKemia were divided into 2 groups: myopathic and nonmyopathic. Within the myopathic group, there were 3 arbitrary subgroups based on creatine kinase values: A (creatine kinase >10 times normal), B (creatine kinase 5-10 times normal), and C (creatine kinase 1-5 times normal)...
January 1, 2018: Journal of Child Neurology
https://www.readbyqxmd.com/read/29572181/urinary-bladder-organ-hypertrophy-is-partially-regulated-by-akt1-mediated-protein-synthesis-pathway
#5
Li-Ya Qiao, Chunmei Xia, Shanwei Shen, Seong Ho Lee, Paul H Ratz, Matthew O Fraser, Amy Miner, John E Speich, Jeffrey J Lysiak, William D Steers
AIMS: The present study aims to investigate the role of Akt in the regulation of urinary bladder organ hypertrophy caused by partial bladder outlet obstruction (pBOO). MAIN METHODS: Male rats were surgically induced for pBOO. Real-time PCR and western blot were used to examine the levels of mRNA and protein. A phosphoinositide 3-kinase (PI3K) inhibitor LY294002 was used to inhibit the activity of endogenous Akt. KEY FINDINGS: The urinary bladder developed hypertrophy at 2 weeks of pBOO...
March 20, 2018: Life Sciences
https://www.readbyqxmd.com/read/29554080/characteristics-of-pulmonary-vascular-remodeling-in-a-novel-model-of-shunt-associated-pulmonary-arterial-hypertension
#6
Mingjie Zhang, Zhiyu Feng, Rui Huang, Chongrui Sun, Zhuoming Xu
BACKGROUND Establishing a shunt-induced pulmonary arterial hypertension (PAH) model in mice would be of great scientific value, but no such models have been reported to date. Here, we established a shunt-associated PAH in mice to investigate the characteristics of pulmonary vascular remodeling, which provides a new platform for the in-depth study of PAH associated with congenital heart disease (CHD). MATERIAL AND METHODS Eighty mice were randomly divided into the heavy shunt group (n=32), the small shunt group (n=32), the sham operation group (n=8), and the control group (n=8)...
March 19, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29545554/systematic-evaluation-of-the-adaptability-of-the-non-radioactive-sunset-assay-to-measure-cardiac-protein-synthesis
#7
Venkatraman Ravi, Aditi Jain, Faiz Ahamed, Nowrin Fathma, Perumal Arumugam Desingu, Nagalingam R Sundaresan
Heart is a dynamic organ that undergoes remodeling in response to both physiological and pathological stimuli. One of the fundamental cellular processes that facilitates changes in the size and shape of this muscular organ is the protein synthesis. Traditionally changes in cardiac protein synthesis levels were measured by radiolabeled tracers. However, these methods are often cumbersome and suffer from radioactive risk. Recently a nonradioactive method for detecting protein synthesis under in vitro conditions called the Surface Sensing of Translation (SUnSET) was described in cell lines of mouse dendrites and T cells...
March 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29538386/prospective-association-between-handgrip-strength-and-cardiac-structure-and-function-in-uk-adults
#8
Sebastian E Beyer, Mihir M Sanghvi, Nay Aung, Alice Hosking, Jackie A Cooper, José Miguel Paiva, Aaron M Lee, Kenneth Fung, Elena Lukaschuk, Valentina Carapella, Murray A Mittleman, Soren Brage, Stefan K Piechnik, Stefan Neubauer, Steffen E Petersen
BACKGROUND: Handgrip strength, a measure of muscular fitness, is associated with cardiovascular (CV) events and CV mortality but its association with cardiac structure and function is unknown. The goal of this study was to determine if handgrip strength is associated with changes in cardiac structure and function in UK adults. METHODS AND RESULTS: Left ventricular (LV) ejection fraction (EF), end-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV), mass (M), and mass-to-volume ratio (MVR) were measured in a sample of 4,654 participants of the UK Biobank Study 6...
2018: PloS One
https://www.readbyqxmd.com/read/29533715/differential-effects-of-attentional-focus-strategies-during-long-term-resistance-training
#9
Brad Jon Schoenfeld, Andrew Vigotsky, Bret Contreras, Sheona Golden, Andrew Alto, Rachel Larson, Nick Winkelman, Antonio Paoli
The purpose of this study was to investigate the effects of using an internal versus external focus of attention during resistance training on muscular adaptations. Thirty untrained college-aged men were randomly assigned to an internal focus group (INTERNAL) that focused on contracting the target muscle during training (n = 15) or an external focus group (EXTERNAL) that focused on the outcome of the lift (n = 15). Training for both routines consisted of 3 weekly sessions performed on non-consecutive days for 8 weeks...
March 13, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29512306/preventing-muscle-wasting-by-osteoporosis-drug-alendronate-in-vitro-and-in-myopathy-models-via-sirtuin-3-down-regulation
#10
Hsien-Chun Chiu, Chen-Yuan Chiu, Rong-Sen Yang, Ding-Cheng Chan, Shing-Hwa Liu, Chih-Kang Chiang
BACKGROUND: A global consensus on the loss of skeletal muscle mass and function in humans refers as sarcopenia and cachexia including diabetes, obesity, renal failure, and osteoporosis. Despite a current improvement of sarcopenia or cachexia with exercise training and supportive therapies, alternative and specific managements are needed to discover for whom are unable or unwilling to embark on these treatments. Alendronate is a widely used drug for osteoporosis in the elderly and postmenopausal women...
March 6, 2018: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/29489727/high-frequency-resistance-training-is-not-more-effective-than-low-frequency-resistance-training-in-increasing-muscle-mass-and-strength-in-well-trained-men
#11
Gederson K Gomes, Cristiane M Franco, Paulo Ricardo P Nunes, Fábio L Orsatti
We studied the effects of two different weekly frequency resistance training (RT) protocols over eight weeks on muscle strength and muscle hypertrophy in well-trained men. Twenty-three subjects (age: 26.2±4.2 years; RT experience: 6.9±3.1 years) were randomly allocated into the two groups: low frequency (LFRT, n = 12) or high frequency (HFRT, n = 11). The LFRT performed a split-body routine, training each specific muscle group once a week. The HFRT performed a total-body routine, training all muscle groups every session...
February 27, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29478747/congenital-generalized-lipodystrophy-in-taiwan
#12
Rai-Hseng Hsu, Wei-De Lin, Mei-Chyn Chao, Hui-Pin Hsiao, Siew-Lee Wong, Pao-Chin Chiu, Shao-Yin Chu, Yu-Yuan Ke, Beng-Huat Lau, Yin-Hsiu Chien, Wuh-Liang Hwu, Fuu-Jen Tsai, Chung-Hsing Wang, Ni-Chung Lee
BACKGROUND: Congenital generalized lipodystrophy (CGL) is a rare disorder characterized by scarce adipose tissue. This disease is distributed worldwide, but little is known about these patients in the Chinese population. Here, we delineate the phenotype and prognosis of CGL in our cohort. METHODS: Patients diagnosed with CGL from 8 medical centers were reviewed. The initial presentation, laboratory findings, and molecular testing were retrospectively analyzed. RESULTS: A total of 16 patients were analyzed, and the current median age was 3...
February 22, 2018: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/29477554/blood-flow-restriction-training-after-achilles-tendon-rupture
#13
Bobby G Yow, David J Tennent, Thomas C Dowd, Jeremy P Loenneke, Johnny G Owens
Blood flow restriction (BFR) training is a technique shown to be safe and effective at increasing muscular strength and endurance in healthy fitness populations and is under study for its use in postinjury rehabilitation. BFR stimulates muscular strength and hypertrophy gains at much lower loads than traditional methods, allowing patients to begin the rehabilitation process much sooner. We report on 2 patients who incorporated BFR training into their traditional rehabilitation program after Achilles tendon ruptures...
February 21, 2018: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29472383/making-sense-of-the-clinical-spectrum-of-limb-girdle-muscular-dystrophies
#14
REVIEW
Satish V Khadilkar, Bhagyadhan A Patel, Jamshed A Lalkaka
The expansion of the spectrum of limb girdle muscular dystrophies (LGMDs) in recent years means that neurologists need to be familiar with the clinical clues that can help with their diagnosis. The LGMDs comprise a group of genetic myopathies that manifest as chronic progressive weakness of hip and shoulder girdles. Their inheritance is either autosomal dominant (LGMD1) or autosomal recessive (LGMD2). Their prevalence varies in different regions of the world; certain ethnic groups have documented founder mutations and this knowledge can facilitate the diagnosis...
February 22, 2018: Practical Neurology
https://www.readbyqxmd.com/read/29463847/small-vessel-vasculopathy-due-to-aberrant-autophagy-in-lamp-2-deficiency
#15
Huan T Nguyen, Satoru Noguchi, Kazuma Sugie, Yoshiyuki Matsuo, Chuyen T H Nguyen, Hitoshi Koito, Ichiro Shiojima, Ichizo Nishino, Hiroyasu Tsukaguchi
Lysosomal associated membrane protein 2 (LAMP2) is physiologically implicated in autophagy. A genetic LAMP2 defect causes Danon disease, which consists of two major phenotypes of myopathy and cardiomyopathy. In addition, arteriopathy may manifest on rare occasions but the pathological basis remains unknown. We encountered two Danon families that developed small-vessel vasculopathy in the coronary or cerebral arteries. To investigate the underlying mechanisms, we characterized the biological features of LAMP-2-deficient mice and cultured cells...
February 20, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29447936/inducing-hypertrophic-effects-of-type-i-skeletal-muscle-fibers-a-hypothetical-role-of-time-under-load-in-resistance-training-aimed-at-muscular-hypertrophy
#16
Jozo Grgic, Jan Homolak, Pavle Mikulic, Javier Botella, Brad J Schoenfeld
An emerging body of evidence is starting to suggest that the hypertrophy of skeletal muscle fibers might be load specific. In other words, it may be that resistance training with high loads (i.e., ≥60% of 1 repetition maximum [RM]) emphasizes a greater growth of type II muscle fibers, while resistance training with low loads (i.e., <60% of 1RM) might primarily augment hypertrophy of type I muscle fibers. Type I and type II muscle fibers possess certain distinct characteristics, with type II muscle fibers having faster calcium kinetics, faster shortening velocities, and ability to generate more power than type I muscle fibers...
March 2018: Medical Hypotheses
https://www.readbyqxmd.com/read/29429571/ndufb8-mutations-cause-mitochondrial-complex-i-deficiency-in-individuals-with-leigh-like-encephalomyopathy
#17
Dorota Piekutowska-Abramczuk, Zahra Assouline, Lavinija Mataković, René G Feichtinger, Eliška Koňařiková, Elżbieta Jurkiewicz, Piotr Stawiński, Mirjana Gusic, Andreas Koller, Agnieszka Pollak, Piotr Gasperowicz, Joanna Trubicka, Elżbieta Ciara, Katarzyna Iwanicka-Pronicka, Dariusz Rokicki, Sylvain Hanein, Saskia B Wortmann, Wolfgang Sperl, Agnès Rötig, Holger Prokisch, Ewa Pronicka, Rafał Płoski, Giulia Barcia, Johannes A Mayr
Respiratory chain complex I deficiency is the most frequently identified biochemical defect in childhood mitochondrial diseases. Clinical symptoms range from fatal infantile lactic acidosis to Leigh syndrome and other encephalomyopathies or cardiomyopathies. To date, disease-causing variants in genes coding for 27 complex I subunits, including 7 mitochondrial DNA genes, and in 11 genes encoding complex I assembly factors have been reported. Here, we describe rare biallelic variants in NDUFB8 encoding a complex I accessory subunit revealed by whole-exome sequencing in two individuals from two families...
March 1, 2018: American Journal of Human Genetics
https://www.readbyqxmd.com/read/29417026/duchenne-muscular-dystrophy-case-report-and-review
#18
Rupam Sinha, Soumyabrata Sarkar, Tanya Khaitan, Soumyajit Dutta
Muscular dystrophies are a clinically and heterogeneous group of disorders that all share clinical characteristics of progressive muscular weakness. Duchenne muscular dystrophy (DMD) is the most common X-linked disorder muscular dystrophy in children, presenting in early childhood and characterized by proximal muscle weakness and calf hypertrophy in affected boys. There is usually delay in motor development and eventually wheelchair confinement followed by premature death from cardiac or respiratory complications...
July 2017: Journal of Family Medicine and Primary Care
https://www.readbyqxmd.com/read/29405193/-the-forensic-medical-characteristic-of-sudden-death-associated-with-metabolic-syndrome
#19
Yu I Pigolkin, Zh V Dorosheva, N S Oganesyan, D V Gornostaev
The detection of grade II-III central obesity on a corpse in conjunction with the identification of two additional criteria (such as arterial hypertension and impaired glucose tolerance) provides, if combined with the autopsy data (including the visual reduction of muscular mass, the increased total amount of the adipose tissue, gynecomastia in men together with hypertrophied abdominal adipose tissue accumulation, decreased face and body pilosis), a basis for diagnostics of metabolic syndrome (MS). The objective parameters for this purpose are waist circumference measurements, corpse weight and height, the degree of visceral obesity, narrowing of the renal arteries as a result of their compression by the surrounding adipose tissue, and accumulation of epicardial fat confirmed by the results of the biochemical analysis...
2018: Sudebno-meditsinskaia Ekspertiza
https://www.readbyqxmd.com/read/29394360/the-roles-of-muscle-stem-cells-in-muscle-injury-atrophy-and-hypertrophy
#20
So-Ichiro Fukada
Skeletal muscle is composed of multinuclear cells called myofibers. Muscular dystrophy (a genetic muscle disorder) induces instability in the cell membrane of myofibers and eventually causes myofiber damage. Non-genetic muscle disorders, including sarcopenia, diabetes, bedridden immobility, and cancer cachexia, lead to atrophy of myofibers. In contrast, resistance training induces myofiber hypertrophy. Thus, myofibers exhibit a plasticity that is strongly affected by both intrinsic and extrinsic factors. There is no doubt that muscle stem cells (MuSCs, also known as muscle satellite cells) are indispensable for muscle repair/regeneration, but their contributions to atrophy and hypertrophy are still controversial...
January 31, 2018: Journal of Biochemistry
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