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Adaptation of cardiac myosin and creatine kinase to chronic hypoxia: role of anorexia and hypertension.
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The effects of chronic hypobaric hypoxia (CHH, 28 days, simulated altitude 5,500 m) on the cardiac expression of myosin heavy chain (MHC) and creatine kinase (CK) was studied in rat left (LV) and right (RV) ventricle. To separate the effects of hypoxia from its associated perturbations, anorexia and
Role of hypoxia-induced anorexia and right ventricular hypertrophy on lactate transport and MCT expression in rat muscle.
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To dissect the independent effects of altitude-induced hypoxemia and anorexia on the capacity for cardiac lactate metabolism, we examined the effects of 21 days of chronic hypobaric hypoxia (CHH) and its associated decrease in food intake and right ventricle (RV) hypertrophy on the monocarboxylate
Changes in ghrelin, CCK, GLP-1, and peroxisome proliferator-activated receptors in a hypoxia-induced anorexia rat model.
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BACKGROUND
A high-altitude environment causes appetite loss in unacclimatised humans, leading to weight reduction. Ghrelin, cholecystokinin (CCK), and glucagon like peptide-1 (GLP-1), are gut hormones involved in the regulation of food intake and energy metabolism. The liver is an important site of
Ameliorative Effect of Ananas comosus on Cobalt Chloride-Induced Hypoxia in Caco2 cells via HIF-1α, GLUT 1, VEGF, ANG and FGF
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In the present study, protective effects of Ananas comosus i.e., pineapple pulp (PA) against cobalt chloride (CoCl2)‑induced hypoxia in Caco-2 cells were evaluated. PA reduces levels of lipid peroxidation, reactive oxygen and nitrogen species. It was proved to be cytoprotective and
Hypoxia and circadian patterns.
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In mammals, biological time keeping is organised with a hierarchical and pyramidal structure, under the control of the master clock in the suprachiasmatic hypothalamic nuclei (SCN). Body temperature (Tb) and metabolic rate have robust circadian patterns, and probably represent primary variables
Acute Normobaric Hypoxia Exposure and Excess Post-Exercise Oxygen Consumption.
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BACKGROUND: Excess postexercise oxygen consumption (EPOC) is an elevation in oxygen consumption (Vo₂) following exercise. Altitude decreases maximal oxygen uptake; however, studies are equivocal concerning the effect on resting metabolic rate. The EPOC response has not been studied with normobaric
Changes in dietary protein intake fail to prevent decrease in muscle growth induced by severe hypoxia in rats.
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Muscle growth, fiber size, muscle and liver glycogen, plasma hormones, and muscle glutamine concentration were evaluated in rats chronically exposed (26 days) to a simulated hypobaric altitude (HA; 6,000 m) and fed diets of varying protein concentrations (10, 20, or 40 g protein/100 g of dry matter;
Effect of hypoxia on the circulating levels of essential mineral elements in rats.
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Changes occurring in concentrations of certain trace metals and electrolytes viz. chromium, copper, zinc, sodium, potassium, calcium, magenesium and chloride in plasma of rats exposed to intermittent hypobaric hypoxia were evaluated. Batches of Sprague-Dowley rats (12 in each group) were exposed for
Hypoxemia-induced leptin secretion: a mechanism for the control of food intake in diseased fish.
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Leptin is a potent anorexigen, but little is known about the physiological conditions under which this cytokine regulates food intake in fish. In this study, we characterized the relationships between food intake, O2-carrying capacity, liver leptin-A1 (lep-a1) gene expression, and plasma leptin-A1
Hypoxia-induced sickness behaviour.
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Sickness behaviour (SB) consists of the set of adaptive responses of the host to severe infections and inflammation. It includes, among others, the thermoregulatory responses such as regulated increase (fever) and/or decrease (anapyrexia) of body temperature (T(b)), decrease of motor activity
Effects of acute hypoxia and hyperthermia on the permeability of the blood-brain barrier in adult rats.
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Acute mountain sickness (AMS) develops within a few hours after arrival at high altitude and includes headache, anorexia, nausea, vomiting, and malaise. This afflicts 15-25% of the general tourist population at moderate altitudes. High-altitude cerebral edema (HACE) is considered to be the end stage
Regulation of body weight by leptin, with special reference to hypoxia-induced regulation.
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Since first cloned and reported by Zhang et al in 1994 (Nature 372:425), the obese gene and its product-leptin has been studied profoundly. Our knowledge in body weight regulation and the role played by leptin has increased substantially. Leptin serves as an adiposity signal to inform the brain of
Leptin receptor-deficient obese Zucker rats reduce their food intake in response to hypobaric hypoxia.
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Exposure to hypoxia induces anorexia in humans and rodents, but the role of leptin remains under discussion and that of orexigenic and anorexigenic hypothalamic neuropeptides remains unknown. The present study was designed to address this issue by using obese (Lepr(fa)/Lepr(fa)) Zucker rats, a rat
Chronic hypoxia delays myocardial lactate dehydrogenase maturation in young rats.
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The effect of exposure to hypobaric hypoxia for 4 weeks (oxygen pressure = 106 hPa), equivalent to 5500 m in altitude) on myocardial total lactate dehydrogenase (tLDH) activity and isoform (H and M) composition was comparatively studied in growing (4.5 weeks old) and in adult (4.5 months old) male
Effects of chronic hypoxia and dietary restriction on myocardial enzyme activities.
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Enzyme activities were measured in homogenates of left and right ventricles of guinea pigs after 14 and 28 days' exposure to 400 mmHg barometric pressure. All animals developed anorexia and right ventricular hypertrophy. Two control groups of animals were used, one free fed and the other restricted
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