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https://www.readbyqxmd.com/read/28529487/cardiac-baroreflex-variability-and-resetting-during-sustained-mild-effort
#1
Mair Zamir, Mark B Badrov, T Dylan Olver, J Kevin Shoemaker
This exploratory study assessed the pattern of closed-loop baroreflex resetting using multi-logistic-curve analysis. Operating point gain and ranges of RR-interval (RRI) and systolic blood pressure (SBP) are derived to examine how these relate to sympathetic activation. Sustained low-intensity isometric handgrip exercise, with a period of post-exercise circulatory occlusion (PECO), provided a model to study baroreflex resetting because the progression toward fatigue at constant tension induces a continuous increase in volitional contribution to neuro-cardiovascular control...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28527222/functional-characterization-of-c-terminal-ryanodine-receptor-1-variants-associated-with-central-core-disease-or-malignant-hyperthermia
#2
Remai Parker, Anja H Schiemann, Elaine Langton, Terasa Bulger, Neil Pollock, Andrew Bjorksten, Robyn Gillies, David Hutchinson, Richard Roxburgh, Kathryn M Stowell
BACKGROUND: Central core disease and malignant hyperthermia are human disorders of skeletal muscle resulting from aberrant Ca2+ handling. Most malignant hyperthermia and central core disease cases are associated with amino acid changes in the type 1 ryanodine receptor (RyR1), the skeletal muscle Ca2+-release channel. Malignant hyperthermia exhibits a gain-of-function phenotype, and central core disease results from loss of channel function. For a variant to be classified as pathogenic, functional studies must demonstrate a correlation with the pathophysiology of malignant hyperthermia or central core disease...
May 15, 2017: Journal of Neuromuscular Diseases
https://www.readbyqxmd.com/read/28523848/dietary-supplementation-of-l-arginine-and-chromium-picolinate-in-sows-during-gestation-affects-the-muscle-fibre-characteristics-but-not-the-performance-of-their-progeny
#3
Zhan Shi, Wentao Song, Yuecheng Sun, Liansheng Wang, Baoming Shi, Anshan Shan, Zhongpeng Bi
BACKGROUND: The present study investigated the effects of dietary supplementation of L-arginine and chromium picolinate (CrP) in sows during gestation on the muscle fibre characteristics, performance and carcass characteristics of their progeny. Sixty healthy sows were randomly divided into four groups as 2 × 2 factorial experiment design: one group received the control diet, another received the control diet + 10 g kg(-1) L-arginine, the third group received the control diet + 400 ppb CrP and the fourth group received the control diet + 10 g kg(-1) L-arginine and 400 ppb CrP...
May 19, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28523133/uniportal-video-assisted-thoracic-surgery-for-major-lung-resections-pitfalls-tips-and-tricks
#4
Mahmoud Ismail, Marc Swierzy, Dania Nachira, Jens C Rückert, Diego Gonzalez-Rivas
Nearly six years since inception, uniportal video-assisted thoracic surgery (VATS) has become a growing part of major lung resections and has revolutionized the way thoracic surgeons treat pulmonary lesions. This technique is being touted for various benefits. It ensures direct visualization together with a better exposure of the lung and allows the chance of a digital palpation of the lesion through a small incision. Postoperative pain is reduced due to the involvement of only one intercostal space without rib spreading and muscle disruption...
April 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28518407/nad-a-big-player-in-cardiac-and-skeletal-muscle-remodeling-and-aging
#5
REVIEW
Pankaj Chaturvedi, Suresh C Tyagi
In the past decade, NAD+ has gained importance for its beneficial effects as antioxidant and antiaging molecule. A paper in science by Zhang et al (2016) has described that NAD+ when replenished, ameliorates muscle dystrophy in mice by improving mitochondrial function. NAD+ was also demonstrated by the authors to improve the life span of mice. Cox et al (2002) demonstrated the cardiac effects of NAD+ which mitigated chronic heart failure via mitochondrial redox state mechanism. Cox et al (2002) also demonstrated that NAD+ is provided in the drinking water, it improves cardiac relaxation in volume overload model of heart failure...
May 18, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28516388/effects-of-different-selenium-sources-on-growth-performance-antioxidant-capacity-and-meat-quality-of-local-chinese-subei-chickens
#6
J L Li, L Zhang, Z Y Yang, Z Y Zhang, Y Jiang, F Gao, G H Zhou
Despite increasing evidence indicating the essential involvement of selenium (Se) on growth performance, antioxidant capacity, and meat quality of commercial broilers, the effects of different Se sources on local Chinese Subei chickens is unclear. A total of 360 50-day-old male chickens were individually weighed and randomly allocated to four treatment groups. Chickens in each of the four groups were fed diets supplemented with 0.3 mg Se/kg as sodium Se (SS), Se-enriched yeast (SY), selenomethionine (Met-Se), or nano red element Se (Nano-Se) for 40 days...
May 17, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28515640/carcass-and-meat-characteristics-and-gene-expression-in-intramuscular-adipose-tissue-of-korean-native-cattle-fed-finishing-diets-supplemented-with-5-palm-oil
#7
Sungkwon Park, Zhang Yan, Changweon Choi, Kyounghoon Kim, Hyunjeong Lee, Youngkyoon Oh, Jinyoung Jeong, Jonggil Lee, Stephen B Smith, Seongho Choi
We hypothesized that supplementing finishing diets with palm oil would promote adipogenic gene expression but depress stearoyl-CoA desaturase (SCD) gene expression in intramuscular (i.m.) adipose tissues of Hanwoo steers during fattening period (from 16 to 32 mon of age). Fourteen Hanwoo steers were allotted randomly to 2 groups of 7 steers based on initial BW and fed either a basal diet (control) or the basal diet supplemented with 5% palm oil (BDSP). At slaughter, i.m. adipose tissue was harvested for analysis of adipogenic gene expression and fatty acid composition...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/28513088/psoas-muscle-area-is-not-representative-of-total-skeletal-muscle-area-in-the-assessment-of-sarcopenia-in-ovarian-cancer
#8
Iris J G Rutten, Jorne Ubachs, Roy F P M Kruitwagen, Regina G H Beets-Tan, Steven W M Olde Damink, Toon Van Gorp
BACKGROUND: Computed tomography measurements of total skeletal muscle area can detect changes and predict overall survival (OS) in patients with advanced ovarian cancer. This study investigates whether assessment of psoas muscle area reflects total muscle area and can be used to assess sarcopenia in ovarian cancer patients. METHODS: Ovarian cancer patients (n = 150) treated with induction chemotherapy and interval debulking were enrolled retrospectively in this longitudinal study...
May 16, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28511934/repeated-manganese-administration-produced-abnormal-expression-of-circadian-clock-genes-in-the-hypothalamus-and-liver-of-rats
#9
Huan Li, Ximin Fan, Ying Luo, Sheng Song, Jie Liu, Qiyuan Fan
Manganese (Mn) neurotoxicity displays non-motor dysfunction and motor impairment like Parkinson's disease (PD), and is called as Manganism. Circadian disruption is a non-motor symptom found in PD and Manganism. Clock genes are essential to drive and maintain circadian rhythm, but little is known about Mn exposure on circadian clock genes expression. Both the brain and liver are targets of Mn, we hypothesize that repeated Mn administration could affect clock gene expression in the hypothalamus and livers. Male Sprague-Dawley rats were intraperitoneally injected Mn(2+)1mg and 5mg /kg as MnCl2•4H2O, every other day for 30 days...
May 13, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28510119/genetic-epidemiology-of-titin-truncating-variants-in-the-etiology-of-dilated-cardiomyopathy
#10
REVIEW
Ali M Tabish, Valerio Azzimato, Aris Alexiadis, Byambajav Buyandelger, Ralph Knöll
Heart failure (HF) is a complex clinical syndrome defined by the inability of the heart to pump enough blood to meet the body's metabolic demands. Major causes of HF are cardiomyopathies (diseases of the myocardium associated with mechanical and/or electrical dysfunction), among which the most common form is dilated cardiomyopathy (DCM). DCM is defined by ventricular chamber enlargement and systolic dysfunction with normal left ventricular wall thickness, which leads to progressive HF. Over 60 genes are linked to the etiology of DCM...
May 5, 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/28508509/investigating-the-inter-subunit-subdomain-interactions-and-motions-relevant-to-disease-mutations-in-the-n-terminal-domain-of-ryanodine-receptors-by-molecular-dynamics-simulation
#11
Wenjun Zheng, Zheng Liu
The ryanodine receptors (RyR) are essential to calcium signaling in striated muscles, and numerous disease mutations have been identified in two RyR isoforms, RyR1 in skeletal muscle and RyR2 in cardiac muscle. A deep understanding of the activation/regulation mechanisms of RyRs has been hampered by the shortage of high-resolution structures and dynamic information for this giant tetrameric complex in different functional states. Toward elucidating the molecular mechanisms of disease mutations in RyRs, we performed molecular dynamics simulation of the N-terminal domain (NTD) which is not only the best-resolved structural component of RyRs, but also a hotspot of disease mutations...
May 15, 2017: Proteins
https://www.readbyqxmd.com/read/28507342/effects-of-dietary-methionine-on-breast-muscle-growth-myogenic-gene-expression-and-igf-i-signaling-in-fast-and-slow-growing-broilers
#12
Chao Wen, Xueying Jiang, Liren Ding, Tian Wang, Yanmin Zhou
This study investigated the responses of fast- (FG) and slow- (SG) growing broilers to dietary methionine (Met) status. The broilers were subjected to low (LM, 0.38 and 0.28 g/100 g), adequate (AM, 0.51 and 0.42 g/100 g) and high (HM, 0.65 and 0.52 g/100 g) Met during 1-21 and 22-42 d, respectively. Compared with the LM diets, the AM and HM diets increased body weight gain only in the FG broilers. The HM diets increased breast muscle yield only in the FG broilers, although insulin-like growth factor-I (IGF-I) concentration was increased in both strains of broilers...
May 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28507235/assessing-the-strength-of-cardiac-and-sympathetic-baroreflex-controls-via-transfer-entropy-during-orthostatic-challenge
#13
Alberto Porta, Andrea Marchi, Vlasta Bari, Beatrice De Maria, Murray Esler, Elisabeth Lambert, Mathias Baumert
The study assesses the strength of the causal relation along baroreflex (BR) in humans during an incremental postural challenge soliciting the BR. Both cardiac BR (cBR) and sympathetic BR (sBR) were characterized via BR sequence approaches from spontaneous fluctuations of heart period (HP), systolic arterial pressure (SAP), diastolic arterial pressure (DAP) and muscle sympathetic nerve activity (MSNA). A model-based transfer entropy method was applied to quantify the strength of the coupling from SAP to HP and from DAP to MSNA...
June 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28503323/severe-cervical-flexion-myelopathy-with-long-tract-signs-a-case-report-and-a-review-of-literature
#14
Takahito Fujimori, Akiko Tamura, Toshitada Miwa, Motoki Iwasaki, Takenori Oda
INTRODUCTION: Hirayama disease, a type of cervical flexion myelopathy, is a rare neurological disease characterized by muscular atrophy of the forearms and hands. Generally, the pathology is limited to the gray matter of the anterior horns in the lower cervical spinal cord. However, in rare cases the damage can spread to the white matter and present as long tract signs. CASE PRESENTATION: We report on a 30-year-old female whose onset presented as unilateral muscle atrophy of the right hand in her teens...
2017: Spinal Cord Series and Cases
https://www.readbyqxmd.com/read/28503265/the-effects-of-caffeine-on-the-long-bones-and-testes-in-immature-and-young-adult-rats
#15
Yoojin Kwak, Hyeonhae Choi, Jaesook Roh
This study was to evaluate the age-dependent effects of caffeine exposure on the long bones and reproductive organs using male rats. A total of 15 immature male rats and 15 young adult male rats were allocated randomly to three groups: a control group and two groups fed caffeine with 120 and 180 mg/kg/day for 4 weeks. Exposure to caffeine at either dose significantly reduced body weight gain; a proportional reduction in muscle and fat mass in immature animals, whereas a selective reduction in fat mass with relatively preserved muscle mass in young adult animals...
April 2017: Toxicological Research
https://www.readbyqxmd.com/read/28502541/prolonged-stance-phase-during-walking-in-intermittent-claudication
#16
Lindy N M Gommans, Annemieke T Smid, Marc R M Scheltinga, Ernst Cancrinus, Frans A M Brooijmans, Kenneth Meijer, Joep A W Teijink
BACKGROUND: Patients with intermittent claudication (IC) tend to walk slower and consume approximately 40% more oxygen during walking compared with healthy individuals. An unfavorable locomotion pattern has been suggested to explain this metabolic inefficiency. However, detailed knowledge of gait parameters in IC is lacking. METHODS: In a cross-sectional study, the gait pattern of newly diagnosed IC patients was compared with that of healthy controls. Spatiotemporal gait parameters such as step length and duration of stance phase were obtained by a photoelectric technique (OptoGait; Microgate, Bolzano, Italy)...
May 11, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28499867/glycine-nitronyl-nitroxide-conjugate-protects-human-umbilical-vein-endothelial-cells-against-hypoxia-reoxygenation-injury-via-multiple-mechanisms-and-ameliorates-hind-limb-ischemia-reperfusion-injury-in-rats
#17
Xiang Gao, Yue Bi, Kui Chi, Yang Liu, Tao Yuan, Xueyan Li, Wei Bi
Oxidative stress and inflammation play important roles in the pathogenesis of ischemia/reperfusion (I/R)-injury. The administration of antioxidants and anti-inflammatory agents has been applied to prevent I/R-injury for several decades. Of the numerous compounds administrated therapeutically in anti-oxidative stress, nitronyl nitroxide has gained increasing attention due to its continuous ability to scavenge active oxygen radicals. However, its effect is not ideal in clinical therapy. In previous study, we linked the anti-inflammatory amino acid glycine to nitronyl nitroxide and developed a novel glycine-nitronyl nitroxide (GNN) conjugate, which showed a synergetic protection against renal ischemia/reperfusion injury...
June 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28499770/development-of-active-nanoparticle-antimicrobial-technologies-for-muscle-based-packaging-applications
#18
REVIEW
Michael A Morris, Sibu C Padmanabhan, Malco C Cruz-Romero, Enda Cummins, Joseph P Kerry
Fresh and processed muscle-based foods are highly perishable food products and packaging plays a crucial role in providing containment so that the full effect of preservation can be achieved through the provision of shelf-life extension. Conventional packaging materials and systems have served the industry well, however, greater demands are being placed upon industrial packaging formats owing to the movement of muscle-based products to increasingly distant markets, as well as increased customer demands for longer product shelf-life and storage capability...
April 28, 2017: Meat Science
https://www.readbyqxmd.com/read/28492810/rimonabant-improves-metabolic-parameters-partially-attributed-to-restoration-of-high-voltage-activated-ca2-channels-in-skeletal-muscle-in-hfd-fed-mice
#19
B Chen, N Hu
Cannabinoid type 1 receptor (CB1R) inhibition tends to be one of the promising strategies for the treatment of obesity and other related metabolic disorders. Although CB1R inhibition may cause adverse psychiatric effects including depression and anxiety, the investigation of the role of peripheral CB1R on weight loss and related metabolic parameters are urgently needed. We first explored the effect of rimonabant, a selective CB1R antagonist/inverse agonist, on some metabolic parameters in high fat-diet (HFD)-induced obesity in mice...
May 4, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28489457/adverse-events-associated-with-a-large-dose-of-intravenous-lipid-emulsion-for-suspected-local-anesthetic-toxicity
#20
Daniel J Corwin, Alexis Topjian, Brenda L Banwell, Kevin Osterhoudt
BACKGROUND: Intravenous lipid emulsion (ILE) has gained favor as a rescue treatment for cardiovascular collapse due to intravenous local anesthetic overdose, however, goals of ILE therapy are still being defined. We describe a case of a girl given 66 mL/kg of 20% lipid emulsion (ILE) in the treatment of presumed mepivacaine toxicity. CASE REPORT: An 11-year-old girl weighing 55.6 kg developed pallor, rolling back of the eyes, and rhythmic muscle twitching after receiving a mandibular nerve block injection with a 1...
July 2017: Clinical Toxicology
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