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Muscle strain

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https://www.readbyqxmd.com/read/28728078/femoral-head-necrosis-a-finite-element-analysis-of-common-and-novel-surgical-techniques
#1
Myriam Cilla, Sara Checa, Bernd Preininger, Tobias Winkler, Carsten Perka, Georg N Duda, Matthias Pumberger
BACKGROUND: Femoral head necrosis is a common cause of secondary osteoarthritis. At the early stages, treatment strategies are normally based on core decompression techniques, where the number, location and diameter of the drilling holes varies depending on the selected approach. The purpose of this study was to investigate the risk of femoral head, neck and subtrochanteric fracture following six different core decompression techniques. MATERIALS: Five common and a newly proposed techniques were analyzed in respect to their biomechanical consequences using finite element analysis...
July 6, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28727929/na-h-exchanger-and-proton-channel-in-heart-failure-associated-with-becker-and-duchenne-muscular-dystrophy
#2
Ghassan Bkaily, Danielle Jacques
Cardiomyopathy is found in patients with Duchenne (DMD) and Becker (BMD) muscular dystrophies which are linked muscle diseases caused by mutations in the dystrophin gene. Dystrophin defects are not limited to DMD but are also present in mild BMD. The hereditary cardiomyopathic hamster of the UM-X7.1 strain is a particular experimental model of heart failure (HF) leading to early death in muscular dystrophy (dystrophin deficiency and sarcoglycan mutation) and heart disease (δ-sarcoglycan deficiency and dystrophin mutation) in human DMD...
July 20, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28727745/evaluation-of-tissue-displacement-and-regional-strain-in-the-achilles-tendon-using-quantitative-high-frequency-ultrasound
#3
Stijn Bogaerts, Catarina De Brito Carvalho, Lennart Scheys, Kaat Desloovere, Jan D'hooge, Frederik Maes, Paul Suetens, Koen Peers
The Achilles tendon has a unique structure-function relationship thanks to its innate hierarchical architecture in combination with the rotational anatomy of the sub-tendons from the triceps surae muscles. Previous research has provided valuable insight in global Achilles tendon mechanics, but limitations with the technique used remain. Furthermore, given the global approach evaluating muscle-tendon junction to insertion, regional differences in tendon mechanical properties might be overlooked. However, recent advancements in the field of ultrasound imaging in combination with speckle tracking have made an intratendinous evaluation possible...
2017: PloS One
https://www.readbyqxmd.com/read/28725529/recent-progress-on-piezoelectric-and-triboelectric-energy-harvesters-in-biomedical-systems
#4
REVIEW
Qiang Zheng, Bojing Shi, Zhou Li, Zhong Lin Wang
Implantable medical devices (IMDs) have become indispensable medical tools for improving the quality of life and prolonging the patient's lifespan. The minimization and extension of lifetime are main challenges for the development of IMDs. Current innovative research on this topic is focused on internal charging using the energy generated by the physiological environment or natural body activity. To harvest biomechanical energy efficiently, piezoelectric and triboelectric energy harvesters with sophisticated structural and material design have been developed...
July 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28723948/integrative-functional-analyses-using-rainbow-trout-selected-for-tolerance-to-plant-diets-reveal-nutrigenomic-signatures-for-soy-utilization-without-the-concurrence-of-enteritis
#5
Jason Abernathy, Andreas Brezas, Kevin R Snekvik, Ronald W Hardy, Ken Overturf
Finding suitable alternative protein sources for diets of carnivorous fish species remains a major concern for sustainable aquaculture. Through genetic selection, we created a strain of rainbow trout that outperforms parental lines in utilizing an all-plant protein diet and does not develop enteritis in the distal intestine, as is typical with salmonids on long-term plant protein-based feeds. By incorporating this strain into functional analyses, we set out to determine which genes are critical to plant protein utilization in the absence of gut inflammation...
2017: PloS One
https://www.readbyqxmd.com/read/28721578/preventive-chair-massage-with-algometry-to-maintain-psychosomatic-balance-in-white-collar-workers
#6
Anna Cabak, Mirosław Mikicin, Marek Łyp, Iwona Stanisławska, Ryszard Kaczor, Wiesław Tomaszewski
People working at computers often suffer from overload-related muscle pain, and physical and mental discomfort. The aim of the study was to evaluate the effectiveness of chair massage, conducted in the workplace among white-collar workers, in relieving symptoms of musculoskeletal strain related to prolonged sitting posture. The study was conducted in 124 white-collar workers, 55 women and 69 men, aged 33.7 ± 7.6 years. Subjects were randomly assigned to three groups: chair massage program, relaxing music sessions, and a control group, each of four-week duration...
July 19, 2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28717620/the-influence-of-muscle-tendon-forces-on-acl-loading-during-jump-landing-a-systematic-review
#7
REVIEW
Katja Oberhofer, S H Hosseini Nasab, Pascal Schütz, Barbara Postolka, Jess G Snedeker, William R Taylor, Renate List
BACKGROUND: The goal of this review is to summarise and discuss the reported influence of muscle-tendon forces on anterior cruciate ligament (ACL) loading during the jump-landing task by means of biomechanical analyses of the healthy knee. METHODS: A systematic review of the literature was conducted using different combinations of the terms "knee", "ligament", "load", "tension ", "length", "strain", "elongation" and "lengthening". 26 original articles (n=16 in vitro studies; n=10 in situ studies) were identified which complied with all inclusion/exclusion criteria...
January 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/28711604/an-animal-model-of-co-existing-sarcopenia-and-osteoporotic-fracture-in-senescence-accelerated-mouse-prone-8-samp8
#8
Ning Zhang, Simon Kwoon Ho Chow, Kwok Sui Leung, Ho Hin Lee, Wing Hoi Cheung
Sarcopenia and osteoporotic fracture are common aging-related musculoskeletal problems. Recent evidences report that osteoporotic fracture patients showed high prevalence of sarcopenia; however, current clinical practice basically does not consider sarcopenia in the treatment or rehabilitation of osteoporotic fracture. There is almost no report studying the relationship of the co-existing of sarcopenia and osteoporotic fracture healing. In this study, we validated aged senescence accelerated mouse prone 8 (SAMP8) and senescence accelerated mouse resistant 1 (SAMR1) as animal models of senile osteoporosis with/without sarcopenia...
July 12, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28711025/three-dimensional-mechano-electrochemical-model-for-smooth-muscle-contraction-of-the-urinary-bladder
#9
Robert Seydewitz, Robin Menzel, Tobias Siebert, Markus Böl
The urinary bladder is a central organ of vertebrates and imposes, based on its extreme deformation (volume changes up to several 100%), special requirements on the overall bladder tissue. However, studies focusing on three-dimensional modelling of bladder deformation and bladder function during micturition are rare. Based on three fields, namely, the membrane potential, calcium concentration, and placement, a mechano-electrochemical-coupled, three-dimensional model describing the contractile behaviour of urinary bladder smooth muscle is presented using a strain energy function...
April 12, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28710834/ultrastructure-of-skeletal-muscles-in-mice-lacking-muscle-specific-vegf-expression
#10
Oliver Baum, Lena Jentsch, Adolfo Odriozola, Stefan A Tschanz, I Mark Olfert
Vascular endothelial growth factor-A (VEGF) influences several physiological processes including endothelial cell function and maintenance of organ/tissue capillarity. While the functional aspects of VEGF were vigorously investigated, only little detail is known on structural integrity of skeletal muscle fibers and capillaries in mice lacking VEGF expression in their muscles. Therefore, we assessed systematically the architecture of the glycolytic plantaris and the oxidative soleus muscles obtained from muscle-specific VEGF knockout (mVEGF-KO, n=7) mice and their wild-type (WT, n=7) littermates by morphometry after transmission electron microscopy...
July 15, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28705295/strength-training-for-women-as-a-vehicle-for-health-promotion-at-work
#11
Kai Nestler, Alexander Witzki, Ulrich Rohde, Thomas Rüther, Kim Alexander Tofaute, Dieter Leyk
BACKGROUND: Women, on average, have less muscle strength than men. This anthropometric-physiological trait may make them more vulnerable to ex - cessive physical strain, injury, and inability to work. Strength training is used for preventive health maintenance and to lessen musculoskeletal symptoms. In this context, we studied whether the degree of muscle strength has any effect on women's health in everyday working life, and also the effects of strength training for women on their health in the workplace...
June 30, 2017: Deutsches Ärzteblatt International
https://www.readbyqxmd.com/read/28704177/morphology-and-contractile-gene-expression-of-adipose-derived-mesenchymal-stem-cells-in-response-to-short-term-cyclic-uniaxial-strain-and-tgf-%C3%AE-1
#12
Neda Rashidi, Mohammad Tafazzoli-Shadpour, Nooshin Haghighipour, Mohammad-Mehdi Khani
Previous studies have shown smooth muscle induction in adipose-derived mesenchymal stem cells (ASCs) caused by long-term cyclic stretch. Here we examined the capability of the short-term straining with time steps of 4, 8, 16 and 24 h alone or combined with TGF-β1 on smooth muscle induction of rabbit ASCs. Alterations in cell morphology were quantified through the cell shape index and orientation angle, and expression levels of α-SMA, SM22-α, h-caldesmon and calponin3 markers were examined using the real-time polymerase chain reaction (PCR) method...
July 12, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28698572/the-effect-of-calorie-restriction-on-mouse-skeletal-muscle-is-sex-strain-and-time-dependent
#13
Luisa Boldrin, Jacob A Ross, Charlotte Whitmore, Bruno Doreste, Charlotte Beaver, Ayad Eddaoudi, Daniel J Pearce, Jennifer E Morgan
Loss of skeletal muscle mass and function occurs with increasing age. Calorie restriction (CR) increases the lifespan of C57Bl/6 mice, but not in the shorter-lived DBA/2 strain. There is some evidence that calorie restriction reduces or delays many of the age-related defects that occur in rodent skeletal muscle. We therefore investigated the effect of short (2.5 month) and longer term (8.5 and 18.5 months) CR on skeletal muscle in male and female C57Bl/6 and DBA/2 mice. We found that short-term CR increased the satellite cell number and collagen VI content of muscle, but resulted in a delayed regenerative response to injury...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28696855/don-t-forget-the-abdominal-wall-imaging-spectrum-of-abdominal-wall-injuries-after-nonpenetrating-trauma
#14
Shanna A Matalon, Reza Askari, Jonathan D Gates, Ketan Patel, Aaron D Sodickson, Bharti Khurana
Abdominal wall injuries occur in nearly one of 10 patients coming to the emergency department after nonpenetrating trauma. Injuries range from minor, such as abdominal wall contusion, to severe, such as abdominal wall rupture with evisceration of abdominal contents. Examples of specific injuries that can be detected at cross-sectional imaging include abdominal muscle strain, tear, or hematoma, including rectus sheath hematoma (RSH); traumatic abdominal wall hernia (TAWH); and Morel-Lavallée lesion (MLL) (closed degloving injury)...
July 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28694237/phase-transitions-during-compression-and-decompression-of-clots-from-platelet-poor-plasma-platelet-rich-plasma-and-whole-blood
#15
Xiaojun Liang, Irina Chernysh, Prashant K Purohit, John W Weisel
Blood clots are required to stem bleeding and are subject to a variety of stresses, but they can also block blood vessels and cause heart attacks and ischemic strokes. We measured the compressive response of human platelet-poor plasma (PPP) clots, platelet-rich plasma (PRP) clots and whole blood clots and correlated these measurements with confocal and scanning electron microscopy to track changes in clot structure. Stress-strain curves revealed four characteristic regions, for compression-decompression: (1) linear elastic region; (2) upper plateau or softening region; (3) non-linear elastic region or re-stretching of the network; (4) lower plateau in which dissociation of some newly made connections occurs...
July 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28692350/the-muscular-dystrophic-chicken-is-hypernatremic
#16
N Saito, H Hirayama, K Yoshimura, Y Atsumi, M Mizutani, K Kinoshita, A Fujiwara, T Namikawa
1. The WWP1 gene, the mutation of which causes muscular dystrophy in chickens, is expressed not only in the pectoral muscle, but also in a number of tissues such as the kidney. Therefore, this study examined some parameters related to kidney function in muscular dystrophic (MD) chickens. 2. Plasma osmolality, Na(+) and K(+) concentrations, aldosterone levels, and the expression of aquaporin (AQP) 2, AQP3, and α subunits of the amiloride-sensitive epithelial sodium channel (αENaC) were analysed in the kidneys of 5-week-old MD chickens and White Leghorn (WL) chickens under physiological conditions or after one day of water deprivation...
July 10, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28685835/pharmacokinetics-and-tissue-distribution-of-enrofloxacin-after-single-intramuscular-injection-in-pacific-white-shrimp
#17
X Fang, J Zhou, X Liu
The pharmacokinetic properties and tissue distribution of enrofloxacin (EF) were investigated after single intramuscular (i.m.) dose of 10 mg/kg body weight (b.w.) in Pacific white shrimp at 22 to 25°C. EF and its metabolite ciprofloxacin (CF) were determined by high-performance liquid chromatography. After i.m. administration, EF was absorbed quickly, and the peak of EF concentration (Cmax ) reached at first time point in hemolymph. The volume of distribution Vd(area) of EF was 3.84 L/kg, indicating that the distribution of EF was good...
July 7, 2017: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28684625/wnt-signalling-controls-the-response-to-mechanical-loading-during-zebrafish-joint-development
#18
L H Brunt, K Begg, E Kague, S Cross, C L Hammond
Joint morphogenesis requires mechanical activity during development. Loss of mechanical strain causes abnormal joint development, which can impact long term joint health. While cell orientation and proliferation are known to shape the joint, dynamic imaging of developing joints in vivo has not been possible in other species. Using genetic labelling techniques in zebrafish we were able, for the first time, to dynamically track cell behaviours in intact moving joints. We identify that proliferation and migration, which contribute to joint morphogenesis, are mechanically controlled and are significantly reduced in immobilised larvae...
July 6, 2017: Development
https://www.readbyqxmd.com/read/28684374/investigating-crispr-cas-systems-in-clostridium-botulinum-via-bioinformatics-tools
#19
Manica Negahdaripour, Navid Nezafat, Nasim Hajighahramani, Seyyed Soheil Rahmatabadi, Younes Ghasemi
The Clustered regularly interspaced short palindromic repeats (CRISPR) systems are a type of innate immunity found in some prokaryotes, which protect them against alien genetic elements by targeting foreign nucleic acids. Some other functions are also attributed to these systems. Clostridium botulinum bacteria produce botulinum neurotoxins (BoNT), one of the deadliest known toxins for humans and some animals. Food poisoning due to these bacteria is still a challenge in food industries. On the other hand, BoNT has been widely investigated for therapeutic applications including different muscle disorders...
July 3, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28681850/coordinated-force-generation-of-skeletal-myosins-in-myofilaments-through-motor-coupling
#20
Motoshi Kaya, Yoshiaki Tani, Takumi Washio, Toshiaki Hisada, Hideo Higuchi
In contrast to processive molecular motors, skeletal myosins form a large motor ensemble for contraction of muscles against high loads. Despite numerous information on the molecular properties of skeletal myosin, its ensemble effects on collective force generation have not been rigorously clarified. Here we show 4 nm stepwise actin displacements generated by synthetic myofilaments beyond a load of 30 pN, implying that steps cannot be driven exclusively by single myosins, but potentially by coordinated force generations among multiple myosins...
July 6, 2017: Nature Communications
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