keyword
MENU ▼
Read by QxMD icon Read
search

Muscle blood flow

keyword
https://www.readbyqxmd.com/read/29043659/magnitude-of-muscle-strength-and-mass-adaptations-between-high-load-resistance-training-versus-low-load-resistance-training-associated-with-blood-flow-restriction-a-systematic-review-and-meta-analysis
#1
REVIEW
Manoel E Lixandrão, Carlos Ugrinowitsch, Ricardo Berton, Felipe C Vechin, Miguel S Conceição, Felipe Damas, Cleiton A Libardi, Hamilton Roschel
BACKGROUND: Low-load resistance training (< 50% of one-repetition maximum [1RM]) associated with blood-flow restriction (BFR-RT) has been thought to promote increases in muscle strength and mass. However, it remains unclear if the magnitude of these adaptations is similar to conventional high-load resistance training (> 65% 1RM; HL-RT). OBJECTIVE: To compare the effects of HL- versus BFR-RT on muscle adaptations using a systematic review and meta-analysis procedure...
October 17, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29040598/effect-of-metformin-on-vascular-function-in-children-with-type-1-diabetes-a-12-month-randomized-controlled-trial
#2
Jemma J A Anderson, Jennifer J Couper, Lynne C Giles, Catherine E Leggett, Roger Gent, Brian Coppin, Alexia S Peña
Context: Children with type 1 diabetes have vascular dysfunction preceding atherosclerosis. Early interventions are needed to reduce cardiovascular disease. Objective: To evaluate the effect of metformin on vascular function in type 1 diabetes children. Design: 12 month double blind, randomized, placebo-controlled trial. Setting: Tertiary pediatric diabetes clinic. Participants: 90 type 1 diabetes children(8-18 years), above 50th percentile body mass index (BMI)...
October 9, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29040222/neurovascular-response-during-exercise-and-mental-stress-in-anabolic-steroid-users
#3
Rafael Armani Porello, Marcelo Rodrigues Dos Santos, Francis Ribeiro de Souza, Guilherme Wesley Peixoto da Fonseca, Ana Luiza Carrari Sayegh, Tiago Franco de Oliveira, César Abreu Akiho, Maurício Yonamine, Rosa Maria Rodrigues Pereira, Carlos Eduardo Negrão, Maria-Janieire de Nazaré Nunes Alves
PURPOSE: Increased resting muscle sympathetic nerve activity (MSNA) and lower forearm blood flow (FBF) were observed in young men who use anabolic androgenic steroids (AAS). However, the response of MSNA and FBF in AAS users triggered by muscle mechanoreflex and central command has never been tested. Additionally, we evaluated the blood pressure (BP) and heart rate (HR) responses during these maneuvers. METHODS: Nineteen AAS users (AASU) aged 31±6 yr and 18 AAS nonusers (AASNU) aged 29±4 yr were recruited...
October 16, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29037770/dietary-nitrate-supplementation-opposes-the-elevated-diaphragm-blood-flow-in-chronic-heart-failure-during-submaximal-exercise
#4
Joshua R Smith, Scott K Ferguson, K Sue Hageman, Craig A Harms, David C Poole, Timothy I Musch
Chronic heart failure (CHF) results in a greater cost of breathing and necessitates an elevated diaphragm blood flow (BF). Dietary nitrate (NO3‾) supplementation lowers the cost of exercise. We hypothesized that dietary NO3‾ supplementation would attenuate the CHF-induced greater cost of breathing and thus the heightened diaphragm BF during exercise. CHF rats received either 5days of NO3‾-rich beetroot (BR) juice (CHF+BR, n=10) or a placebo (CHF, n=10). Respiratory muscle BFs (radiolabeled microspheres) were measured at rest and during submaximal exercise (20m/min, 5% grade)...
October 13, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/29037406/monitoring-changes-in-body-surface-temperature-associated-with-treadmill-exercise-in-dogs-by-use-of-infrared-methodology
#5
Maria Rizzo, Francesca Arfuso, Daniela Alberghina, Elisabetta Giudice, Matteo Gianesella, Giuseppe Piccione
The aim of this study was to evaluate the influence of moderate treadmill exercise session on body surface and core temperature in dog measured by means of two infrared instruments. Ten Jack Russell Terrier/Miniature Pinscher mixed-breed dogs were subjected to 15min of walking, 10min of trotting and 10min of gallop. At every step, body surface temperature (Tsurface) was measured on seven regions (neck, shoulder, ribs, flank, back, internal thigh and eye) using two different methods, a digital infrared camera (ThermaCam P25) and a non-contact infrared thermometer (Infrared Thermometer THM010-VT001)...
October 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29036571/atrial-flow-dynamics-as-a-determinant-of-tissue-temperature-during-balloon-cryoablation
#6
Justin Ghosh, Mark A McGuire
Aims: Balloon cryoablation is an accepted method of achieving pulmonary vein isolation for the treatment of atrial fibrillation. The relationship between blood flow in the atrium and cryo energy delivery to the tissue remains poorly understood. Methods and results: Controlled cryoablations were performed in vitro using a pulmonary vein phantom constructed from bovine muscle, providing a 20 mm vein ostium. A temperature sensor was mounted within the 'vein wall' at a 1 mm tissue depth...
October 4, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29035613/quercetin-induced-amp-activated-protein-kinase-activation-attenuates-vasoconstriction-through-lkb1-ampk-signaling-pathway
#7
Seul Gi Kim, Jae-Ryong Kim, Hyoung Chul Choi
The vascular tone plays an important role in blood pressure and flow. It is influenced by the contraction of vascular smooth muscle cells (VSMCs), which in turn is regulated by the balance between the myosin light chain kinase (MLCK) and the phosphorylated myosin light chain (p-MLC). Quercetin is a common flavonoid which is found in many fruits and red wine. Although quercetin has been widely reported to be involved in cell proliferation, migration, and apoptosis in VSMCs, it has not yet been demonstrated whether quercetin is related to vasocontraction, a function regulated by the AMP-activated protein kinase (AMPK) signaling pathway...
October 16, 2017: Journal of Medicinal Food
https://www.readbyqxmd.com/read/29034529/reliability-of-muscle-blood-flow-and-oxygen-consumption-response-from-exercise-using-near-infrared-spectroscopy
#8
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/29032314/remodeling-of-arterial-wall-response-to-changes-in-both-blood-flow-and-blood-pressure
#9
Kozaburo Hayashi, Akihisa Makino, Daichi Kakoi
Many studies have been performed on arterial responses to chronic changes in blood flow (BF) and blood pressure (BP). However, little is known about the effects of simultaneous changes in BF and BP. The present study was carried out to know biomechanical responses of arterial wall to the combination of increased BP, i.e. hypertension (HT), with lower or higher BF than normal, and the results were compared with those observed under normal BP, i.e. normotension (NT), combined with these BF conditions. Eight weeks old rats were subjected to BF and/or BP changes for 8 weeks until 16 weeks of age...
October 7, 2017: Journal of the Mechanical Behavior of Biomedical Materials
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/29030339/muscle-%C3%AE-adrenergic-responsiveness-during-exercise-and-atp-induced-vasodilation-in-chronic-obstructive-pulmonary-disease-patients
#12
Ulrik Winning Iepsen, Gregers Druedal Wibe Munch, Camilla Koch Ryrsø, Niels H Secher, Peter Lange, Pia Thaning, Bente Klarlund Pedersen, Stefan P Mortensen
Sympathetic vasoconstriction is blunted in exercising muscle (functional sympatholysis) but becomes attenuated with age. We tested the hypothesis that functional sympatholysis is further impaired in chronic obstructive pulmonary disease (COPD) patients. We determined leg blood flow (LBF) and calculated leg vascular conductance (LVC) during 1) femoral-arterial Tyramine infusion (evokes endogenous norepinephrine release; 1 µmol min(-1) kg leg mass(-1)); 2) one-legged knee-extensor exercise with and without Tyramine infusion (10 W and 20% of maximal workload (WLmax)); 3) ATP (0...
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
#13
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/29026684/combined-multi-distance-frequency-domain-and-diffuse-correlation-spectroscopy-system-with-simultaneous-data-acquisition-and-real-time-analysis
#14
Stefan A Carp, Parisa Farzam, Norin Redes, Dennis M Hueber, Maria Angela Franceschini
Frequency domain near infrared spectroscopy (FD-NIRS) and diffuse correlation spectroscopy (DCS) have emerged as synergistic techniques for the non-invasive assessment of tissue health. Combining FD-NIRS oximetry with DCS measures of blood flow, the tissue oxygen metabolic rate can be quantified, a parameter more closely linked to underlying physiology and pathology than either NIRS or DCS estimates alone. Here we describe the first commercially available integrated instrument, called the "MetaOx", designed to enable simultaneous FD-NIRS and DCS measurements at rates of 10 + Hz, and offering real-time data evaluation...
September 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29025901/effects-of-age-and-exercise-training-on-coronary-microvascular-smooth-muscle-phenotype-and-function
#15
Judy M Muller-Delp, Kazuki Hotta, Bei Chen, Bradley Jon Behnke, Joshua J Maraj, Michael D Delp, Tiffani R Lucero, Jeremy A Bramy, David B Alarcon, Hannah E Morgan, Morgan R Cowan, Anthony D Haynes
Coronary microvascular function and blood flow responses during acute exercise are impaired in the aged heart, but can be restored by exercise training. Coronary microvascular resistance is directly dependent on vascular smooth muscle function in coronary resistance arterioles; therefore, we hypothesized that age impairs contractile function and alters the phenotype of vascular smooth muscle in coronary arterioles. We further hypothesized that exercise training restores contractile function and reverses age-induced phenotypic alterations of arteriolar smooth muscle...
October 12, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29016842/comparison-of-emg-activity-and-blood-flow-during-graded-exertion-in-the-orbicularis-oris-muscle-of-adult-subjects-with-and-without-lip-incompetence-a-cross-sectional-survey
#16
Jun-Ichi Takada, Jun J Miyamoto, Chiemi Sato, Ayano Dei, Keiji Moriyama
Background/Objectives: The peri-oral muscles-including orbicularis oris-are critical in maintaining equilibrium in tooth position. Lip incompetence (LI) can thus be a factor in malocclusion. We therefore aimed to validate a technique to evaluate not only muscle activity via electromyography (EMG) but also muscle endurance and fatigue via blood flow (BF) for LI. Subjects/Methods: Subjects were classified into increased muscle tension/lip incompetent (experimental) and normal muscle tension/lip competent (control) groups...
August 21, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/29016764/development-of-a-novel-shock-wave-catheter-ablation-system-a-validation-study-in-pigs-in-vivo
#17
Michinori Hirano, Hiroaki Yamamoto, Yuhi Hasebe, Koji Fukuda, Susumu Morosawa, Hirokazu Amamizu, Kazuma Ohyama, Hironori Uzuka, Kazuyoshi Takayama, Hiroaki Shimokawa
Aims: Although the radiofrequency catheter ablation (RFCA) is widely used for the treatment of tachyarrhythmias, it has three fundamental weaknesses as a thermal ablation system, including a limited lesion depth, myoendocardial injury linking to thromboembolism, and prolonged inflammation followed by subsequent recurrences. In order to overcome these limitations, we have been developing a shock wave (SW) catheter ablation (SWCA) system as a novel non-thermal therapy. In the present study, we validated our new SWCA system with increased SW intensity...
August 2, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28994159/calcium-and-electrical-dynamics-in-lymphatic-endothelium
#18
Erik J Behringer, Joshua P Scallan, Mohammad Jafarnejad, Jorge A Castorena-Gonzalez, Scott D Zawieja, James E Moore, Michael J Davis, Steven S Segal
Subsequent to a rise in intracellular Ca(2+) ([Ca(2+) ]i ), hyperpolarization of the endothelium coordinates vascular smooth muscle relaxation along resistance arteries during blood flow control. In the lymphatic vasculature, collecting vessels generate rapid contractions coordinated along lymphangions to propel lymph, but the underlying signalling pathways are unknown. We tested the hypothesis that lymphatic endothelial cells (LECs) exhibit Ca(2+) and electrical signalling properties that facilitate lymph propulsion...
October 9, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28987643/blood-flow-restricted-resistance-training-in-older-adults-at-risk-of-mobility-limitations
#19
Summer B Cook, Dain P LaRoche, Michelle R Villa, Hannah Barile, Todd M Manini
High-load resistance training (HL) may be contraindicated in older adults due to pre-existing health conditions (e.g. osteoarthritis). Low-load blood flow restricted (BFR) resistance training offers an alternative to HL with potentially similar strength improvement. PURPOSE: To compare muscle strength, cross-sectional area (CSA), physical function, and quality of life (QOL) following 12-weeks of HL or BFR training in older adults at risk of mobility limitations. METHODS: Thirty-six males and females (mean: 75...
October 5, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28986360/exaggerated-cardiovascular-responses-to-treadmill-running-in-rats-with-peripheral-arterial-insufficiency
#20
J Matthew Kuczmarski, Kellee Unrath, Gail D Thomas
Patients with atherosclerotic peripheral artery disease (PAD) have an augmented pressor response to treadmill walking, but the underlying mechanisms remain poorly understood and difficult to isolate due to the confounding presence of numerous cardiovascular risk factors. In this study, we tested the hypothesis that a chronic deficit in muscle blood flow capacity would be sufficient to trigger an exaggerated pressor response to dynamic exercise. Sprague Dawley rats (5 male, 5 female) were instrumented with radiotelemetery devices in order to measure the cardiovascular responses to treadmill running before and after bilateral femoral artery ligation, which has been shown previously to reduce the blood flow capacity of the distal hindlimb muscles by >60%...
October 6, 2017: American Journal of Physiology. Heart and Circulatory Physiology
keyword
keyword
41611
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"