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Skeletal muscle blood flow

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https://www.readbyqxmd.com/read/29131007/proteinase-activated-receptor-2-sensitivity-of-amplified-trpa1-activity-in-skeletal-muscle-afferent-nerves-and-exercise-pressor-reflex-in-rats-with-femoral-artery-occlusion
#1
Jihong Xing, Jianhua Li
BACKGROUND/AIMS: Limb ischemia occurs in peripheral artery disease (PAD). Sympathetic nerve activity (SNA) that regulates blood flow directed to the ischemic limb is exaggerated during exercise in this disease, and transient receptor potential channel A1 (TRPA1) in thin-fiber muscle afferents contributes to the amplified sympathetic response. The purpose of the present study was to determine the role of proteinase-activated receptor-2 (PAR2) in regulating abnormal TRPA1 function and the TRPA1-mediated sympathetic component of the exercise pressor reflex...
November 6, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29117630/biophysical-properties-of-microvascular-endothelium-requirements-for-initiating-and-conducting-electrical-signals
#2
Adam Kapela, Erik J Behringer, Steven S Segal, Nikolaos M Tsoukias
OBJECTIVE: Electrical signaling along the endothelium underlies spreading vasodilation and blood flow control. We use mathematical modeling to determine the electrical properties of the endothelium and gain insight into the biophysical determinants of electrical conduction. METHODS: Electrical conduction data along endothelial cell (EC) tubes (40 μm wide, 2.5 mm long) isolated from mouse skeletal muscle resistance arteries were analyzed using cable equations and a multicellular computational model...
November 8, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/29114523/skeletal-muscle-contraction-induced-vasodilation-in-the-microcirculation
#3
REVIEW
Kwang-Seok Hong, Kijeong Kim
Maximal whole body exercise leads skeletal muscle blood flow to markedly increase to match metabolic demands, a phenomenon termed exercise hyperaemia that is accomplished by increasing vasodilation. However, local vasodilatory mechanisms in response to skeletal muscle contraction remain uncertain. This review highlights metabolic vasodilators released from contracting skeletal muscle, endothelium, or blood cells. As a considerable skeletal muscle vasodilation potentially results in hypotension, sympathetic nerve activity needs to be augmented to elevate cardiac output and blood pressure during dynamic exercise...
October 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29096356/salvianolic-acid-a-attenuates-limb-ischemia-reperfusion-injury-in-skeletal-muscle-of-rats
#4
Yijia Xiang, Shiyong Ye, Changhong Cai, Junchong Chen, Xuyong Zhao, Ning Zhu, Chunlai Zeng
Ischemia and reperfusion(I/R) injury can cause complications in applying blood flow treatment for atherosclerosis occlusion syndrome. Platelet activation and inflammatory reaction play a role in the procession of I/R injury. This study was designed to investigate the effects of Salvianolic Acid A(SAA) on limb I/R injury via inhibition of platelet activation and inflammatory reaction. Rats were divided into sham, I/R, I/R+SAA-Low (5mg/kg) and I/R+SAA-high (10mg/kg) groups with a procession of 6h for ischemia and 24h for reperfusion in the femoral artery of the right hind limb, with the exception of the sham group...
October 30, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29096037/evaluation-of-pharmacokinetic-models-for-perfusion-imaging-with-dynamic-contrast-enhanced-magnetic-resonance-imaging-in-porcine-skeletal-muscle-using-low-molecular-weight-contrast-agents
#5
Stefan Hindel, Giorgos Papanastasiou, Peter Wust, Marc Maaß, Anika Söhner, Lutz Lüdemann
PURPOSE: Pharmacokinetic models for perfusion quantification with a low-molecular-weight contrast agent (LMCA) in skeletal muscle using dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) were evaluated. METHODS: Tissue perfusion was measured in seven regions of interest (ROIs) placed in the total hind leg supplied by the femoral artery in seven female pigs. DCE-MRI was performed using a 3D gradient echo sequence with k-space sharing. The sequence was acquired twice, first after LMCA and then after blood pool contrast agent injection...
November 2, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29080996/impact-of-local-heating-and-cooling-on-skeletal-muscle-transcriptional-response-related-to-myogenesis-and-proteolysis
#6
Roksana B Zak, B M Hassenstab, L K Zuehlke, M W S Heesch, R J Shute, T L Laursen, D T LaSalle, D R Slivka
PURPOSE: To determine the impact of local muscle heating and cooling on myogenic and proteolytic gene responses following resistance exercise. METHODS: Recreationally trained males (n = 12), age 25.3 ± 1.5, % body fat 13.6 ± 1.92, completed four sets of 8-12 repetitions of unilateral leg press and leg extension while heating one leg, and cooling the other. Muscle biopsies were taken from the vastus lateralis of each leg pre and 4 h post exercise. RESULTS: MyoD, FOXO1, and MuRF1 mRNA increased with exercise regardless of temperature (p < 0...
October 28, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29069752/the-caudal-pedunculopontine-tegmental-nucleus-may-be-involved-in-the-regulation-of-skeletal-muscle-activity-by-melanocortin-sympathetic-pathway-a-virally-mediated-trans-synaptic-tracing-study-in-spinally-transected-transgenic-mice
#7
Zhi-Gang He, Bao-Wen Liu, Zhi-Xiao Li, Xue-Bi Tian, San-Guang Liu, Anne Manyande, Ding-Yu Zhang, Hong-Bing Xiang
Understanding neuroanatomical sympathetic circuitry and neuronal connections from the caudal pedunculopontine tegmental nucleus to skeletal muscle is important to the study of possible mechanisms of pedunculopontine tegmental nucleus (PPTg) and cuneiform nucleus (CnF) that are involved in the regulation of skeletal muscle activity of the sympathetic pathway. The aim of this study was to use virus PRV-614 to trace the melanocortin-sympathetic neural pathways from PPTg and CnF to a hindlimb muscle (gastrocnemius) in spinally transected MC4R-GFP transgenic mice...
September 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/29067667/flow-cytometry-defined-cd49d-expression-in-circulating-t-lymphocytes-is-a-biomarker-for-disease-progression-in-duchenne-muscular-dystrophy
#8
Wilson Savino, Fernanda Pinto-Mariz, Vincent Mouly
Duchenne muscular dystrophy (DMD) affects 1:3500-1:5000 male births, and is caused by X-linked mutations in the dystrophin gene, manifested by progressive muscle weakness and wasting due to the absence of dystrophin protein, leading to degeneration of skeletal muscle. DMD patients are clinically heterogeneous and the functional phenotype often cannot be correlated with the genotype. Therefore, defined reliable noninvasive biomarkers aiming at predicting if a given DMD child will progress more or less rapidly will be instrumental to better design inclusion of defined patients for future therapeutic assays...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29034529/reliability-of-muscle-blood-flow-and-oxygen-consumption-response-from-exercise-using-near-infrared-spectroscopy
#9
Adam A Lucero, Gifty Addae, Wayne Lawrence, Beemnet Neway, Daniel P Credeur, James Faulkner, David Rowlands, Lee Stoner
Near-infrared spectroscopy (NIRS), coupled with rapid venous (VO) and arterial occlusions (AO) can be used to non-invasively estimate resting local skeletal muscle blood flow (mBF) and oxygen consumption (mV̇O2 ), respectively. However, the day-to-day reliability of mBF and mV̇O2 responses to stressors such as incremental dynamic exercise has not been established. PURPOSE: To determine the reliability of NIRS derived mBF and mV̇O2 response from incremental dynamic exercise. METHODS: Measurements of mBF and mV̇O2 were collected in the vastus lateralis of twelve healthy, physically active adults [7 m and 5 f; 25 y (SD 6)] over 3 non-consecutive visits within 10 days...
October 16, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29031484/effects-of-leucine-enriched-essential-amino-acid-and-whey-protein-bolus-dosing-upon-skeletal-muscle-protein-synthesis-at-rest-and-after-exercise-in-older-women
#10
Daniel J Wilkinson, Syed S I Bukhari, Bethan E Phillips, Marie C Limb, Jessica Cegielski, Matthew S Brook, Debbie Rankin, William K Mitchell, Hisamine Kobayashi, John P Williams, Jonathan Lund, Paul L Greenhaff, Kenneth Smith, Philip J Atherton
BACKGROUND & AIMS: Impaired anabolic responses to nutrition and exercise contribute to loss of skeletal muscle mass with ageing (sarcopenia). Here, we tested responses of muscle protein synthesis (MPS), in the under represented group of older women, to leucine-enriched essential amino acids (EAA) in comparison to a large bolus of whey protein (WP). METHODS: Twenty-four older women (65 ± 1 y) received (N = 8/group) 1.5 g leucine-enriched EAA supplements (LEAA_1...
September 23, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29030342/the-sex-specific-impact-of-aging-on-the-blood-pressure-response-to-exercise
#11
Joel D Trinity, Gwenael Layec, Corey R Hart, Russell S Richardson
An exaggerated blood pressure (BP) response to exercise has been linked to cardiovascular disease (CVD), but little is known about the impact of age and sex on this response. Therefore, this study examined the hemodynamic and skeletal muscle metabolic response to dynamic plantar flexion exercise, at 40% of WRmax, in 40 physical activity-matched young (n=20, 23±1 yr) and old (n=20, 73±2 yr), equally distributed, male and female subjects. Central hemodynamics and BP (finometer), popliteal artery (PA) blood flow (Doppler ultrasound), and skeletal muscle metabolism (phosphorous magnetic resonance spectroscopy, (31)P-MRS) were measured during 5 mins of plantar flexion exercise...
October 13, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29027210/oedema-fibrosis-in-duchenne-muscular-dystrophy-role-of-cardiovascular-magnetic-resonance-imaging
#12
REVIEW
Sophie Mavrogeni, Antigoni Papavasiliou, Katerina Giannakopoulou, George Markousis-Mavrogenis, Maria Roser Pons, Evangelos Karanasios, Ioannis Nikas, George Papadopoulos, Genovefa Kolovou, George P Chrousos
Duchenne muscular dystrophy (DMD) is an X-linked muscle disorder characterized by progressive, irreversible loss of cardiac and skeletal muscular function. Muscular enlargement in DMD is attributed to oedema, due to the increased cytoplasmic Na+ concentration. The aim in this review is to present the current experience and emphasize the role of cardiovascular magnetic resonance (CMR) in the diagnosis of this condition. DMD patients' survival depends on ventilatory assistance, as respiratory muscle dysfunction was the most common cause of death in the past...
October 13, 2017: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28986234/effects-of-blood-flow-restricted-exercise-training-on-muscular-strength-and-blood-flow-in-older-adults
#13
Jahyun Kim, James A Lang, Neha Pilania, Warren D Franke
BACKGROUND: In young adults, blood flow restricted exercise (BFRE) at relatively low intensities can increase muscle strength as effectively as conventional high intensity training. Ischemic exercise can also increase collateral blood flow in skeletal muscle. However, the effects of chronic BFRE on muscle strength and blood flow in older adults remain unknown. The purpose of this study was to compare the effects of 4weeks of BFRE training on skeletal muscle strength and blood flow between young and older subjects and between older adults performing BFRE and conventional high intensity resistance exercise...
December 1, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28982945/exercise-training-improves-blood-flow-to-contracting-skeletal-muscle-of-older-men-via-enhanced-cgmp-signaling
#14
Peter Piil, Tue Smith Jørgensen, Jon Egelund, Rasmus Damsgaard, Lasse Gliemann, Ylva Hellsten, Michael Nyberg
Physical activity has the potential to offset age-related impairments in the regulation of blood flow and O2 delivery to the exercising muscles; however, the mechanisms underlying this effect of physical activity remain poorly understood. The present study examined the role of cGMP in training-induced adaptations in the regulation of skeletal muscle blood flow and oxidative metabolism during exercise in aging humans. We measured leg hemodynamics and oxidative metabolism during exercise engaging the knee-extensor muscles in young (n=15, 25 ± 1 years) and older (n=15, 72 ± 1 years) subjects before and after a period of aerobic high-intensity exercise training...
October 5, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28982943/effects-of-exercise-training-on-calf-muscle-oxygen-extraction-and-blood-flow-in-patients-with-peripheral-artery-disease
#15
Wesley B Baker, Zhe Li, Steven S Schenkel, Malavika Chandra, David R Busch, Erin Kristine Englund, Kathryn H Schmitz, Arjun G Yodh, Thomas F Floyd, Emile R Mohler
We employed near-infrared optical techniques, diffuse correlation spectroscopy (DCS) and frequency-domain near-infrared spectroscopy (FD-NIRS), to test the hypothesis that supervised exercise training increases skeletal muscle microvascular blood flow and oxygen extraction in patients with peripheral artery disease (PAD) who experience claudication. PAD patients (n=64) were randomly assigned to exercise and control groups. Patients in the exercise group received three months of supervised exercise training...
October 5, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28981145/rapid-versus-slow-ascending-vasodilatation-intercellular-conduction-versus-flow-mediated-signalling-with-tetanic-versus-rhythmic-muscle-contractions
#16
Shenghua Y Sinkler, Steven S Segal
In response to exercise, vasodilatation initiated within the microcirculation of skeletal muscle ascends the resistance network into upstream feed arteries (FAs) located external to the tissue. Ascending vasodilatation (AVD) is essential to reducing FA resistance that otherwise restricts blood flow into the microcirculation. We tested the hypothesis that signalling events underlying AVD vary with the intensity and duration of muscle contraction. In the gluteus maximus muscle of anaesthetized male C57BL/6 mice (age, 3-4 months), brief tetanic contraction (100 Hz, 500 ms) evoked rapid onset vasodilatation (ROV) in FAs that peaked within 4 s...
October 5, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28975653/analysis-of-skeletal-muscle-microcirculation-in-a-porcine-polytrauma-model-with-haemorrhagic-shock
#17
Zhi Qiao, Klemens Horst, Michel Teuben, Johannes Greven, Luxu Yin, Yannik Kalbas, René H Tolba, Hans-Christoph Pape, Frank Hildebrand, Roman Pfeifer
Polytraumatised patients with haemorrhagic shock are prone to develop systemic complications, such as SIRS (systemic inflammatory response syndrome), ARDS (acute respiratory distress syndrome) and MOF (multiple organ failure). The pathomechanism of severe complications following trauma is multifactorial, and it is believed that microcirculatory dysfunction plays an important role. The aim of this study was to determine the changes in the microcirculation in musculature over time during shock and subsequent resuscitation in a porcine model of haemorrhagic shock and polytrauma...
October 3, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28967239/effect-of-martial-arts-training-on-il-6-and-other-immunological-parameters-among-trinidadian-subjects
#18
Geeta Kurhade, B Shivananda Nayak, Arvind Kurhade, Chandrasekhar Unakal, Krutika Kurhade
BACKGROUND: Persistent bouts of extended exercise and heavy training are associated with depressed immune cell function. It has recently been demonstrated that IL-6 is produced locally in contracting skeletal muscles and acts on a wide range of tissues. Larger amounts of IL-6 are produced in response to exercise than any other cytokines. Though the majority of existing data obtained following prolonged exercise, it remains to be explained the effect of martial arts training on IL-6 and other immunological parameters and associated changes to the duration of this type of exercise...
September 29, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28960141/tailoring-iridium-luminescence-and-gold-nanoparticle-size-for-imaging-of-microvascular-blood-flow
#19
Nicola J Rogers, Hannah C Jeffery, Sunil Claire, David J Lewis, Gerald Zikeli, Nikolas J Hodges, Stuart Egginton, Gerard B Nash, Zoe Pikramenou
AIM: Imaging of blood flow in narrow channels and close to vessel walls is important in cardiovascular research for understanding pathogenesis. Our aim was to provide novel nanoprobes with visible emission and long lifetimes as trackers of flow. MATERIALS & METHODS: Gold nanoparticles coated with an iridium complex were prepared. Luminescence imaging was used to monitor their flows in different hematocrit blood and in murine tissues. RESULTS: The velocities are independent of hematocrit level and the nanoparticles entering blood circulation can be clearly detected in vessels in lungs, mesentery and the skeletal muscle...
September 29, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28940557/skeletal-muscle-protein-accretion-rates-and-hindlimb-growth-are-reduced-in-late-gestation-intrauterine-growth-restricted-fetal-sheep
#20
Paul J Rozance, Laura Zastoupil, Stephanie R Wesolowski, David A Goldstrohm, Brittany Strahan, Melanie Cree-Green, Melinda Sheffield-Moore, Giacomo Meschia, William W Hay, Randall B Wilkening, Laura D Brown
KEY POINTS: Adults who were affected by intrauterine growth restriction (IUGR) suffer from reductions in muscle mass, which may contribute to insulin resistance and the development of diabetes. We demonstrate slower hindlimb linear growth and muscle protein synthesis rates that match the reduced hindlimb blood flow and oxygen consumption rates in IUGR fetal sheep. These adaptations resulted in hindlimb blood flow rates in IUGR that were similar to control fetuses on a weight-specific basis...
September 22, 2017: Journal of Physiology
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