View clinical trials related to Oxidative Stress.
Filter by:This study evaluate supplementation of vitamin E (alpha-tocopherol) in obese adolescent. Half of the patient will receive vitamin E and the other half received placebo
Diets containing excessive salt (>12 g/day) have negative effects on kidney and cardiovascular system. Considering this known fact, the investigators aimed to study if the amount of the water taken with excessive salt had any part on these negative effects by testing the blood pressure, serum osmolality, endothelial functions, cardiac function, inflammatory parameters and sympathetic nervous system. Excessive dietary salt raises the serum osmolality, which triggers the protection mechanisms of the body. The first mechanism is the secretion of vasopressin from posterior pituitary and the second one is the polyol mediated aldose reductase enzyme activation in renal tubules. In the beginning, water and a little amount of salt is reabsorbed from the kidneys for keeping the serum osmolality in normal ranges by the elevation of vasopressin. Besides the high levels of vasopressin for long durations may have a role in both developments of hypertension and the progression/development of chronic kidney disease. Polyol mediated aldose reductase enzyme turns glucose into sorbitol, which is turned to fructose by sorbitol dehydrogenase activity. Fructose is degraded by fructokinase activity into toxic substances. With this pathway, the acute energy need is satisfied, yet uric acid, local oxidative stress, and inflammatory mediators rise while nitric oxide levels decreasing. These facts are independent risk factors for both kidney disease progression and hypertension. In addition, excessive salt intake may elevate the transforming growth factor beta-1 (TGF-B1) levels, which activates the sympathetic system, inflammation, and endothelial dysfunction. According to these data, the investigators speculate that if they increase the amount of water intake while eating the high salt diet they may decrease the toxic effect of salt with less increase in serum osmolarity. To test this hypothesis, by regulating the salt and water amount in healthy people's diets, the investigators aimed to evaluate the following these parameters; biochemical parameters that could affect the blood and urine osmolality, blood pressure, vascular endothelial functions with the non-invasive flow-mediated dilatation technique and arterial stiffness, systolic and diastolic functions of the heart by transthoracic echocardiography. In addition, it was planned to evaluate the hormonal effects of arginine vasopressin, a long peptide with 39 amino acids, which is longer and easier to measure than vasopressin levels in serum by measuring the pituitary hormone-derived copeptin. Although, decreasing the salt intake is the first step of the treatment in hypertension, and kidney diseases, the compliance rate to less sodium intake is very low (<20%). The investigators aim is to evaluate the effects of water, which is taken acutely with the excessive salt intake on cardiovascular system and kidney. The findings of the study will important for public health. If the investigators prove their hypothesis, they may recommend increasing high water intake before feeling thirst of which may contribute to decreasing the prevalence of hypertension and kidney disease.
This experiment consists on a 20-day reduction in daily step in free-living active individuals to induce physical inactivity. This will be used to test the efficacy of the anti-oxidant cocktail we aim to test as a new countermeasure in 2016 during the 60-d bed rest planed by ESA/CNES. The objective of this study is to investigate whether the cocktail of natural antioxidants XXS-2A comprising vitamin E and coupled with omega-3 helps to prevent and / or reduce the glucose intolerance and improve oxidative defenses induced by 20 days of physical inactivity through daily step reduction Although physical inactivity is reported to affect glucose tolerance within days of inactivity, we selected a period of 20 days for the effect of the cocktail to take place and assess secondary molecular mechanisms. The effect of this short period of inactivity on metabolism will moreover be boosted during the last 10 days by taking fructose, a sugar found in abundance in fruits, honey and juices, which is known to quickly trigger metabolic deregulation.
Prospective observational study to determine predictors that related to cardiac troponin I (cTnI) release, malondialdehyde (MDA) and high sensitivity C Reactive Protein (hs-CRP) after Tour de Borobudur (TdB) 2017
Dark chocolate (DC) is rich in epicatechin which augments nitric oxide (NO) production through endothelium-dependent influences. The increased bioavailability and activity of NO have been demonstrated to statistically increase flow-mediated dilation in healthy subjects and in hypertensive patients. DC supplementation has been hailed for its positive effects on cardiovascular health and it has been proposed as a booster of physical performance in athletes, however the mechanisms by which DC improves oxidative stress, vascular function and athletic performance are not fully understood. The investigators designed a human study assessing how DC improves NO bioavailability and activity in elite athletes. Twenty-four elite soccer players (aged 18-35 years old, all males) are divided in 2 groups and randomly assigned to receive DC (85% cocoa), 40g per day or white/milk chocolate (<35% cocoa) for 30 days. The primary outcome measure is the evaluation of Soluble NOX2-derived peptide (sNOX2-dp), a direct marker of NADPH oxidase activation. The secondary outcome measures are other markers of oxidative stress, as the soluble P-selectin (sPs), Vitamin E, soluble CD40 Ligand (sCD40L), a marker of in vivo platelet activation and flow-mediated dilation assessed by vascular ultrasound. All parameters are assessed at baseline and after 30 days in both groups.
The purpose of the present study is to investigate the effect of pre-exercise supplementation of Corinthian currant on metabolism, performance and blood redox status during, and after an acute bout of prolonged exercise. Methods: Eleven healthy male adults (18 - 45y) performed an acute bout of prolonged cycling in a crossover fashion. Each bout consisted of a 90 min constant-intensity (70 - 75% VO2max) submaximal glycogen depletion trial, followed by a time trial (TT) to exhaustion (95% VO2max), with a wash out period of 2 weeks between bouts. During each experimental condition and 30 min prior to exercise, participants consumed an isocaloric (1.5 g CHO/kg body mass) amount of randomly assigned Corinthian currants, glucose drink, or water. Blood was drawn at baseline, 30 min after the supplement consumption (pre-exercise) and at 30, 60, 90 min of submaximal trial, after TT, and 1 h after the end of exercise (post TT), for the assessment of metabolic changes and redox status alterations.
This study aims to evaluate whether dietary supplementation with fish oil can protect against the cardiopulmonary alterations linked to air pollution
This is a randomized controlled trial of a human-derived human milk fortifier (H2MF) vs standard bovine-derived human milk fortifier (HMF) evaluating fecal microbiota and fecal and urinary biomarkers of oxidative stress in premature infants.
This project aims to evaluate if after 14 days of grape juice ingestion there is improvement of the parameters of strength, fatigue and oxidative stress in judo fighters. The study will be a randomized, blind, crossover clinical trial of 20 Judo athletes. Judo wrestling simulations will be performed on 3 different days.
The purpose of this research project is to determine if use of optimized target oxygen strategy during delivery room resuscitation can reduce oxidative stress in premature newborns. Objective is to compare oxidative stress markers between preterm neonates resuscitated in the delivery room using three different target oxygen strategies. OX50 target oxygen strategy is currently in use and recommended by neonatal resuscitation program. In this strategy oxygen is adjusted to meet the goal transitional saturations which are approximated 50th centile saturations observed in healthy term newborns. In OX25 target oxygen strategy oxygen will be adjusted to meet the goal transitional saturations which are 25th percentile transitional saturations observed in healthy term newborns. In OX75 target oxygen strategy oxygen will be adjusted to meet the goal transitional saturations which are 75th percentile transitional saturations observed in healthy term newborns.