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Cardiovascular physiology

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https://www.readbyqxmd.com/read/28640770/physiological-responses-and-time-motion-analysis-of-small-combat-games-in-kickboxing-impact-of-ring-size-and-number-of-within-round-sparring-partners
#1
Ibrahim Ouergui, Nizar Houcine, Hamza Marzouki, Philip Davis, Emerson Franchini, Nabil Gmada, Ezzedine Bouhlel
Ouergui, I, Houcine, N, Marzouki, H, Davis, P, Franchini, E, Gmada, N, and Bouhlel, E. Physiological responses and time-motion analysis of small combat games in kickboxing: impact of ring size and number of within-round sparring partners. J Strength Cond Res 31(7): 1840-1846, 2017-The study aimed to investigate the physiological responses and time-structure of small combat games (SCGs) in kickboxing according to ring sizes and number of sparring partners. Twenty athletes from regional (n = 13) and national levels (n = 7) participated in the study (mean ± SD, age: 20...
July 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28631764/-hemodynamic-effects-of-positive-end-expiratory-pressure
#2
Marco Marini, Giorgio Caretta, Fabio Vagnarelli, Fabiana Lucà, Emilia Biscottini, Alberto Lavorgna, Vincenza Procaccini, Letizia Riva, Gabriele Vianello, Nadia Aspromonte, Andrea Mortara, Renata De Maria, Piera Capasso, Serafina Valente, Michele Massimo Gulizia
The application of a positive end-expiratory pressure (PEEP), the cornerstone of noninvasive ventilation (NIV), causes hemodynamic changes in the cardiovascular system. To understand the benefits of NIV it is necessary to resume concepts of cardiovascular physiology and pathophysiology about cardiac function determinants, venous return, ventricular interdependence and heart-lung interaction, and to understand how PEEP interacts with them. The hemodynamic effects of PEEP are mediated by the increase in transpulmonary pressure, which results in increased pulmonary vascular resistance and in an attending small reduction of venous return in conditions of euvolemia, in a substantial reduction of left ventricular afterload and a potential positive effect on left ventricular stroke volume...
June 2017: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/28628970/a-randomized-double-blind-clinical-study-on-blood-pressure-reduction-and-blood-lipid-profile-amelioration-on-treatment-with-ankascin-568
#3
Chien-Li Chen, Jen-Ho Tseng, Tzu-Ming Pan, Sheng-Huang Hsiao
Hypertension and cardiovascular complications are the leading causes of death worldwide. Antihypertensive drugs often cause various side effects, and improper use of antihypertensive medications can result in irreparable damage. Edible fungi of the Monascus species have been used as traditional Chinese medicines in Southeast Asia for several centuries. The fermented products of Monascus purpureus NTU 568 (ANKASCIN 568) possess a number of functional secondary metabolites including the anti-inflammatory pigments monascin and ankaflavin...
June 30, 2017: Chinese Journal of Physiology
https://www.readbyqxmd.com/read/28626082/significant-role-of-the-cardio-postural-interaction-in-blood-pressure-regulation-during-standing
#4
Da Xu, Ajay Verma, Amanmeet Garg, Michelle Bruner, Reza Fazel-Rezai, Andrew P Blaber, Kouhyar Tavakolian
Cardiovascular and postural control systems have been studied independently despite the increasing evidence showing the importance of cardio-postural interaction in blood pressure regulation. In this study, we aimed to assess the role of cardio-postural interaction in relation to cardiac baroreflex in blood pressure regulation under orthostatic stress before and after mild exercise. Physiological variables representing cardiovascular control (heart rate and systolic blood pressure), lower limb muscle activation (electromyography), and postural sway (center of pressure derived from force and moment data during sway) were measured from 17 healthy participants (25±2 years; 8 females) during a sit-to-stand test before and after sub-maximal exercise...
June 16, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28626075/sex-differences-in-vascular-physiology-and-pathophysiology-estrogen-and-androgen-signaling-in-health-and-disease
#5
Austin C Boese, Seong Chul Kim, Ke-Jie Yin, Jean-Pyo Lee, Milton H Hamblin
Sex differences between women and men are often overlooked and underappreciated when studying the cardiovascular system. It has been long assumed that men and women are physiologically similar, and this notion has resulted in females being clinically evaluated and treated for cardiovascular pathophysiological complications as males. Currently, there is increased recognition of fundamental sex differences in cardiovascular function, anatomy, cell signaling, and pathophysiology. NIH has enacted guidelines expressly to gain knowledge about ways the sexes differ in both normal function and diseases at the various research levels (molecular, cellular, tissue, organ, system)...
June 16, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28626074/a-type-potassium-channels-contribute-to-prorenin-increase-of-firing-activity-in-hypothalamic-vasopressin-neurosecretory-neurons
#6
Soledad Pitra, Javier E Stern
Recent studies support an important contribution of prorenin (PR) and its receptor (PRR) to the regulation of hypothalamic sympathetic and neurosecretory outflows to the cardiovascular system, including systemic release of vasopressin (VP), both under physiological and cardiovascular disease conditions. Still, the identification of precise cellular mechanisms and neuronal/molecular targets remain unknown. We recently showed that PRR is expressed in VP neurons, and that their activation increases neuronal activity...
June 16, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28623384/the-role-of-cardiopulmonary-exercise-testing-for-decision-making-in-patients-with-repaired-tetralogy-of-fallot
#7
REVIEW
Frederic Dallaire, Rachel M Wald, Ariane Marelli
Tetralogy of Fallot is the most common form of cyanotic congenital heart disease. As a result of the surgical strategies employed at the time of initial repair, chronic pulmonary regurgitation (PR) is prevalent in this population. Despite sustained research efforts, patient selection and timing of pulmonary valve replacement (PVR) to address PR in young asymptomatic patients with repaired tetralogy of Fallot (rToF) remain a fundamental but as yet unanswered question in the field of congenital heart disease...
June 16, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28623159/epigenetic-biomarkers-and-cardiovascular-disease-circulating-micrornas
#8
David de Gonzalo-Calvo, Eduardo Iglesias-Gutiérrez, Vicenta Llorente-Cortés
MicroRNAs (miRNAs) are a class of small noncoding RNA (20-25 nucleotides) involved in gene regulation. In recent years, miRNAs have emerged as a key epigenetic mechanism in the development and physiology of the cardiovascular system. These molecular species regulate basic functions in virtually all cell types, and are therefore directly associated with the pathophysiology of a large number of cardiovascular diseases. Since their relatively recent discovery in extracellular fluids, miRNAs have been studied as potential biomarkers of disease...
June 13, 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/28619598/incremental-prognostic-value-of-a-complex-left-ventricular-remodeling-classification-in-asymptomatic-for-heart-failure-hypertensive-patients
#9
Iacopo Fabiani, Nicola Riccardo Pugliese, Salvatore La Carrubba, Lorenzo Conte, Francesco Antonini-Canterin, Paolo Colonna, Frank Benedetto, Enrico Calogero, Valentina Barletta, Scipione Carerj, Simona Buralli, Stefano Taddei, Maria Francesca Romano, Vitantonio Di Bello
We evaluated the prognostic impact of a complex remodeling classification (CRC) in asymptomatic patients with arterial hypertension (AH). We retrospectively included 749 hypertensive patients (female 325, 43.4% age 62 ± 11.3 years) in Stages A and B of heart failure. CRC was evaluated including indexed left ventricular mass, end-diastolic volume, and relative wall thickness. After 45-month follow-up, we considered a composite endpoint: total mortality, myocardial infarction, myocardial revascularization, cerebrovascular events, and acute pulmonary edema...
May 25, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/28619367/the-vasoprotective-axes-of-the-renin-angiotensin-system-physiological-relevance-and-therapeutic-implications-in-cardiovascular-hypertensive-and-kidney-diseases
#10
REVIEW
Xiao C Li, Jianfeng Zhang, Jia L Zhuo
The renin-angiotensin system (RAS) is undisputedly one of the most prominent endocrine (tissue-to-tissue), paracrine (cell-to-cell) and intracrine (intracellular/nuclear) vasoactive systems in the physiological regulation of neural, cardiovascular, blood pressure, and kidney function. The importance of the RAS in the development and pathogenesis of cardiovascular, hypertensive and kidney diseases has now been firmly established in clinical trials and practice using renin inhibitors, angiotensin-converting enzyme (ACE) inhibitors, type 1 (AT1) angiotensin II (ANG II) receptor blockers (ARBs), or aldosterone receptor antagonists as major therapeutic drugs...
June 12, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28618995/the-complexity-of-omega-3-fatty-acids-modulation-of-signaling-pathways-related-to-pancreatic-cancer
#11
Carolina Torres, Andrew M Diaz, Daniel R Principe, Paul J Grippo
Cancer is a major public health problem worldwide and is the second leading cause of death in the United States. Although cancer death rate has dropped by 23% since 1991, there are certain types of cancer for which death rates are still increasing such as, pancreatic cancer. There is an urgent need to find new therapies that could help improve this dreadful outcome. In this regard, the role of nutrition in health and disease has attracted much attention. Several dietary ingredients are involved in metabolic, physiological, and cellular signaling affecting tumor growth and progression...
June 16, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28618917/reduced-cardiovascular-activation-following-chronic-stress-in-caregivers-of-people-with-anorexia-nervosa
#12
Ángel Romero-Martínez, Luis Moya-Albiol
Caring for offspring diagnosed with eating disorders (EDs) puts caregivers under high levels of chronic stress, which have negative consequences for their health. Unfortunately, caregivers have received little attention from mental health professionals. Chronic stress experienced by informal caregivers has been associated with the alteration of body homeostasis, and therefore, the functioning of various physiological systems. This could be the basis of health problems in informal caregivers of people with EDs...
June 15, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28617909/development-of-a-flow-evolution-network-model-for-the-stress-strain-behavior-of-poly-l-lactide
#13
Maureen L Dreher, Srinidhi Nagaraja, Jorgen Bergstrom, Danika Hayman
Computational modeling is critical to medical device development and has grown in its utility for predicting device performance. Additionally, there is an increasing trend to use absorbable polymers for the manufacturing of medical devices. However, computational modeling of absorbable devices is hampered by a lack of appropriate constitutive models that capture their viscoelasticity and post-yield behavior. The objective of this study was to develop a constitutive model that incorporated viscoplasticity for a common medical absorbable polymer...
June 15, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28616771/androgen-supplementation-improves-some-but-not-all-aspects-of-immune-senescence-in-aged-male-macaques
#14
Maham Rais, Randall M Wilson, Henryk F Urbanski, Ilhem Messaoudi
Aging leads to a progressive decline in immune function commonly referred to as immune senescence, which results in increased incidence and severity of infection. In addition, older males experience a significant disruption in their levels of circulating androgens, notably testosterone and dehydroepiandrosterone (DHEA), which has been linked to sarcopenia, osteoporosis, cardiovascular disease, and diabetes. Since sex steroid levels modulate immune function, it is possible that the age-related decline in androgen levels can also affect immune senescence...
June 14, 2017: GeroScience
https://www.readbyqxmd.com/read/28616554/alpha2a-adrenergic-receptor-and-enos-genetic-polymorphisms-are-associated-with-exercise-muscle-vasodilatation-in-apparently-healthy-individuals
#15
Rafael Amorim Belo Nunes, Lucia Pereira Barroso, Alexandre da Costa Pereira, Maria Urbana Pinto Brandão Rondon, Carlos Eduardo Negrão, José Eduardo Krieger, Alfredo José Mansur
PURPOSE: Muscle vasodilatation during exercise has been associated with cardiovascular health and may be influenced by genetic variability. The purpose of this study was to evaluate functional genetic polymorphisms of physiologic pathways related to the regulation of the cardiovascular function (alpha-adrenergic receptors, endothelial nitric oxide synthase and bradykinin B2 receptor) and exercise muscle vasodilatation in apparently healthy men and women. METHODS: We enrolled 689 individuals without established cardiovascular disease that had attended a check-up program...
December 2016: IJC Heart & Vasculature
https://www.readbyqxmd.com/read/28615947/treatment-of-secondary-hyperparathyroidism-the-clinical-utility-of-etelcalcetide
#16
REVIEW
Mario Cozzolino, Andrea Galassi, Ferruccio Conte, Michela Mangano, Luca Di Lullo, Antonio Bellasi
Secondary hyperparathyroidism (SHPT), a very frequent, severe, and worsening complication of chronic kidney disease, is characterized by high serum parathyroid hormone (PTH), parathyroid gland hyperplasia, and disturbances in mineral metabolism. Clinically, SHPT shows renal osteodystrophy, vascular calcification, cardiovascular damage, and fatal outcome. Calcium-sensing receptor (CaSR) is the main physiological regulator of PTH secretion; its activation by calcium rapidly inhibits PTH. Another important player in regulating mineral metabolism is vitamin D receptor (VDR), which is under the influence of vitamin D and influences the intestinal absorption of calcium and phosphate, PTH gene expression, and bone calcium mobilization...
2017: Therapeutics and Clinical Risk Management
https://www.readbyqxmd.com/read/28615705/a-long-term-and-slow-releasing-hydrogen-sulfide-donor-protects-against-myocardial-ischemia-reperfusion-injury
#17
Xiaotian Sun, Wenshuo Wang, Jing Dai, Sheng Jin, Jiechun Huang, Changfa Guo, Chunsheng Wang, Liewen Pang, Yiqing Wang
Hydrogen sulfide (H2S) has been recognized as an important gasotransmitter exerting various physiological effects, especially in the cardiovascular system. Herein we investigated the cardioprotective effects of a novel long-term and slow-releasing H2S donor, DATS-MSN, using in vivo myocardial ischemia/reperfusion (I/R) models and in vitro hypoxia/reoxygenation cardiomyocyte models. Unlike the instant-releasing pattern of sodium hydrosulphide (NaHS), the release of H2S from DATS-MSN was quite slow and continuous both in the cell culture medium and in rat plasma (elevated H2S concentrations during 24 h and 72 h reperfusion)...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28615314/mitochondria-and-reactive-oxygen-species-contribute-to-neurogenic-hypertension
#18
REVIEW
Samuel H H Chan, Julie Y H Chan
Beyond its primary role as fuel generators, mitochondria are engaged in a variety of cellular processes, including redox homeostasis. Mitochondrial dysfunction, therefore, may have a profound impact on high-energy-demanding organs such as the brain. Here, we review the roles of mitochondrial biogenesis and bioenergetics, and their associated signaling in cellular redox homeostasis, and illustrate their contributions to the oxidative stress-related neural mechanism of hypertension, focusing on specific brain areas that are involved in the generation or modulation of sympathetic outflows to the cardiovascular system...
July 2017: Physiology
https://www.readbyqxmd.com/read/28614056/spermine-and-spermidine-reversed-age-related-cardiac-deterioration-in-rats
#19
Hao Zhang, Junying Wang, Lingxu Li, Nannan Chai, Yuhan Chen, Feixiang Wu, Weihua Zhang, Lina Wang, Sa Shi, Li Zhang, Shuling Bian, Changqing Xu, Ye Tian, Yajun Zhao
Aging is the most important risk factor for cardiovascular disease (CVD). Slowing or reversing the physiological impact of heart aging may reduce morbidity and mortality associated with age-related CVD. The polyamines, spermine (SP) and spermidine (SPD) are essential for cell growth, differentiation and apoptosis, and levels of both decline with age. To explore the effects of these polyamines on heart aging, we administered SP or SPD intraperitoneally to 22- to 24-month-old rats for 6 weeks. Both treatments reversed and inhibited age-related myocardial morphology alterations, myocardial fibrosis, and cell apoptosis...
May 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/28613982/dietary-phosphorus-intake-and-the-kidney
#20
Alex R Chang, Cheryl Anderson
Although phosphorus is an essential nutrient required for multiple physiological functions, recent research raises concerns that high phosphorus intake could have detrimental effects on health. Phosphorus is abundant in the food supply of developed countries, occurring naturally in protein-rich foods and as an additive in processed foods. High phosphorus intake can cause vascular and renal calcification, renal tubular injury, and premature death in multiple animal models. Small studies in human suggest that high phosphorus intake may result in positive phosphorus balance and correlate with renal calcification and albuminuria...
June 14, 2017: Annual Review of Nutrition
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