scholarly journals Relationship of vitamin E metabolism and oxidation in exercising human subjects

2006 ◽  
Vol 96 (S1) ◽  
pp. S34-S37 ◽  
Author(s):  
Maret G. Traber
Keyword(s):  
Lipid Peroxidation ◽  
Vitamin E ◽  
Muscle Damage ◽  
Human Subjects ◽  
Double Blind Study ◽  
Hilly Terrain ◽  
Double Blind ◽  
Vitamins E And C ◽  
Relationship Of ◽  
Decrease Lipid Peroxidation

During endurance exercise, oxygen consumption by the skeletal muscle can increase 100–200 times. We previously found that during an ultramarathon race (50 km, forest trail through hilly terrain) compared with a day of rest, vitamin E disappeared faster (as measured using 2H-labelled α-tocopherol) and lipid peroxidation increased. Therefore, we hypothesized that prior supplementation with antioxidants (vitamins E and C) would decrease oxidative stress during distance running and, therefore, decrease lipid peroxidation and inflammation, decreaseDNA damage, decrease muscle damage and/or improve recovery. To test these hypotheses, we carried out a randomized, double-blind study in runners (n 11 females, 11 males) who were participants in an annual ultramarathon race. We found that supplementation with both vitamins E and C only prevented increases in lipid peroxidation, but had no apparent effect on DNA damage, inflammation or muscle damage. These results suggest that the mechanism of oxidative damage is operating independently of the inflammatory and muscle damage responses.

scholarly journals Variegate porphyria induces plasma and neutrophil oxidative stress: effects of dietary supplementation with vitamins E and C

2009 ◽  
Vol 103 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Miguel D. Ferrer ◽  
Pedro Tauler ◽  
Antoni Sureda ◽  
Clara Palacín ◽  
Josep A. Tur ◽  
...  
Keyword(s):  
Vitamin E ◽  
Vitamin C ◽  
Oxidative Damage ◽  
Antioxidant Activities ◽  
Dietary Supplementation ◽  
Antioxidant Defenses ◽  
Ros Production ◽  
Double Blind ◽  
Variegate Porphyria ◽  
Vitamins E And C

Our aim was to analyse the influence of variegate porphyria (VP) on the antioxidant defenses and markers of oxidative damage and inflammation in plasma and neutrophils and the effects of dietary supplementation with vitamins E and C on these parameters in plasma, neutrophils and erythrocytes. Twelve women affected by VP and twelve pair-matched healthy control women participated in a double-blind crossover study. Each participant took 50 mg/d of vitamin E and 150 mg/d of vitamin C, or a placebo, for 6 months, by consuming an almond-based beverage as the vehicle. Women affected by VP presented higher C-reactive protein and malondialdehyde (MDA) circulating levels. Plasma antioxidant defenses were not different between porphyric and control women. Neutrophils from VP women presented decreased catalase (CAT) and glutathione reductase (GR) activities together with increased protein carbonyl levels. Reactive oxygen species (ROS) production from stimulated neutrophils was also higher in porphyric women than their controls. Dietary supplementation was effective in increasing α-tocopherol levels in neutrophils and in reducing MDA levels in plasma. Erythrocyte CAT and GR activities were enhanced by the enriched beverage only in the control subjects. In conclusion, women affected by VP present a situation of inflammation, plasma oxidative damage and neutrophils more primed to the oxidative burst, with decreased antioxidant activities and increased ROS production capabilities and protein oxidative damage. Dietary supplementation with vitamin E (50 mg/d) and vitamin C (150 mg/d) for 6 months decreased plasma oxidative damage and enhanced the erythrocyte activities of CAT and GR.

A Placebo-Controlled Double-Blind Study Demonstrates the Clinical Efficacy of a Novel Herbal Formulation for Relieving Joint Discomfort in Human Subjects with Osteoarthritis of Knee

2018 ◽  
Vol 21 (5) ◽  
pp. 511-520 ◽  
Author(s):  
Vasu Karlapudi ◽  
Anjaneya Venkata Vara Prasad Mungara ◽  
Krishanu Sengupta ◽  
Barbara A. Davis ◽  
Siba Prasad Raychaudhuri
Keyword(s):  
Clinical Efficacy ◽  
Human Subjects ◽  
Blind Study ◽  
Double Blind Study ◽  
Double Blind ◽  
Osteoarthritis Of Knee ◽  
Herbal Formulation

Glycine Propionyl-L-carnitine Modulates Lipid Peroxidation and Nitric Oxide in Human Subjects

2009 ◽  
Vol 79 (3) ◽  
pp. 131-141 ◽  
Author(s):  
Richard J. Bloomer ◽  
Lesley C. Tschume ◽  
Webb A. Smith
Keyword(s):  
Nitric Oxide ◽  
Lipid Peroxidation ◽  
Aerobic Exercise ◽  
Human Subjects ◽  
Blood Lipid ◽  
Lipid Profiles ◽  
Post Intervention ◽  
Double Blind ◽  
Before And After ◽  
Main Effects

Objective: To determine the efficacy of glycine propionyl-L-carnitine (GPLC) to decrease lipid peroxidation, elevate nitric oxide, and improve blood lipid profiles in human subjects. Methods: Thirty untrained, normolipidemic subjects performed eight weeks of supervised aerobic exercise while supplementing GPLC at one of two doses (1 or 3 grams daily of PLC + glycine) or placebo, following random assignment in a double-blind manner. Fasting blood samples were analyzed at rest for malondialdehyde, nitric oxide, and lipids before and after the intervention. Results: Malondialdehyde was decreased (p<0.05) from pre- to post-intervention with 1 g GPLC (1.08±0.24 vs. 0.69±0.25 µmol·L -1) and 3 g GPLC (0.94±0.18 vs. 0.66±0.17 µmol·L -1), but did not change statistically (p>0.05) with placebo (1.12±0.21 vs. 1.03±0.23 µmol·L -1). Nitric oxide was increased (p<0.05) from pre- to post-intervention with 3 g GPLC (21.34±2.27 vs. 29.46±3.61 µmol·L -1), but did not change statistically (p>0.05) with 1 g GPLC (23.22±4.13 vs. 26.24±4.32 µmol·L -1) or placebo (24.31±3.90 vs. 26.14±4.11 µmol·L -1). No main effects or interaction effects were noted for blood lipids (p>0.05). Conclusion: GPLC supplementation combined with eight weeks of aerobic exercise decreases lipid peroxidation and elevates nitric oxide, but does not further improve blood lipid profiles in normolipidemic subjects.

Effects of vitamin E supplementation on exercise-induced oxidative stress: a meta-analysis

2014 ◽  
Vol 39 (9) ◽  
pp. 1029-1037 ◽  
Author(s):  
Vahan Stepanyan ◽  
Melissa Crowe ◽  
Nagaraja Haleagrahara ◽  
Bruce Bowden
Keyword(s):  
Oxidative Stress ◽  
Lipid Peroxidation ◽  
Vitamin E ◽  
Muscle Damage ◽  
Meta Analysis ◽  
Protective Effects ◽  
Study Selection ◽  
Exercise Induced ◽  
Study Designs ◽  
Selection Of

Tocopherols (commonly referred to as “vitamin E”) are frequently studied antioxidants in exercise research. However, the studies are highly heterogeneous, which has resulted in contradicting opinions. The aim of this review is to identify similar studies investigating the effects of tocopherol supplementation on exercise performance and oxidative stress and to perform minimally biased qualitative comparisons and meta-analysis. The literature search and study selection were performed according to Cochrane guidelines. A 2-dimensional study execution process was developed to enable selection of similar and comparable studies. Twenty relevant studies were identified. The high variability of study designs resulted in final selection of 6 maximally relevant studies. Markers of lipid peroxidation (malondialdehyde) and muscle damage (creatine kinase) were the 2 most frequently and similarly measured variables. Meta comparison showed that tocopherol supplementation did not result in significant protection against either exercise-induced lipid peroxidation or muscle damage. The complex antioxidant nature of tocopherols and low accumulation rates in muscle tissues could underlie an absence of protective effects.

scholarly journals Effects of Bezafibrate and Simvastatin on Endothelial Activation and Lipid Peroxidation in Hypercholesterolemia: Evidence of Different Vascular Protection by Different Lipid-Lowering Treatments

2003 ◽  
Vol 88 (11) ◽  
pp. 5341-5347 ◽  
Author(s):  
Giovambattista Desideri ◽  
Giuseppe Croce ◽  
Marzia Tucci ◽  
Gabriella Passacquale ◽  
Simona Broccoletti ◽  
...  
Keyword(s):  
Lipid Peroxidation ◽  
Vitamin E ◽  
Adhesion Molecule ◽  
Prostaglandin F2α ◽  
Endothelial Activation ◽  
Lipid Lowering ◽  
Intercellular Adhesion Molecule ◽  
Vascular Protection ◽  
Double Blind ◽  
Vitamin E Supplementation

Abstract Hypercholesterolemia is combined with enhanced lipid peroxidation, which can promote atherogenesis by inducing endothelial adhesion molecule expression. Statins may protect vascular endothelium in hypercholesterolemia by reducing enhanced plasma levels of low-density lipoprotein and decreasing oxidative stress. Herein, we describe increased circulating levels of soluble intercellular adhesion molecule-1, vascular cell adhesion molecule-1, and E-selectin and total 8-iso-prostaglandin F2α (8-iso-PGF2α) concentrations, as indexes of endothelial activation and lipid peroxidation, respectively, in 67 hypercholesterolemic patients compared with 32 normocholesterolemic subjects. Significant cholesterol reductions were achieved in hypercholesterolemic patients after 6 months under either simvastatin (40 mg/d) or bezafibrate (800 mg/d) treatment, given according to a randomized double-blind trial. Simvastatin but not bezafibrate simultaneously reduced soluble adhesin and total 8-iso-PGF2α concentrations also. Vitamin E supplementation (400 IU/d) further reduced indexes of endothelial activation and lipid peroxidation in simvastatin-treated patients and significantly reduced the above indexes in bezafibrate-treated patients. Changes in circulating soluble adhesion molecule levels were directly correlated with changes in total 8-iso-PGF2α concentrations in simvastatin-treated patients also receiving vitamin E supplementation. All together, our data demonstrated that hypercholesterolemia was combined with endothelial activation and lipid peroxidation, which were efficaciously counteracted by simvastatin but not bezafibrate treatment. Thus, a different vascular protection can be achieved by different lipid-lowering treatments.

Effect of Eccentric Exercise and Vitamin E Supplementation on Indices of Lipid Peroxidation, Muscle Damage and Muscle Soreness

1994 ◽  
Vol 87 (s1) ◽  
pp. 83-83
Author(s):  
AMcE Jenkinson ◽  
C Riddoch ◽  
RJ Maughan ◽  
PC Morrice ◽  
KM Brown ◽  
...  
Keyword(s):  
Lipid Peroxidation ◽  
Vitamin E ◽  
Muscle Damage ◽  
Eccentric Exercise ◽  
Muscle Soreness ◽  
Vitamin E Supplementation

Effect of Intramuscular Vitamin E on Mortality and Intracranial Hemorrhage in Neonates of 1000 Grams or Less

PEDIATRICS ◽  
1990 ◽  
Vol 85 (4) ◽  
pp. 578-584
Author(s):  
Wendy H. Fish ◽  
Mervyn Cohen ◽  
Deborah Franzek ◽  
Janice M. Williams ◽  
James A. Lemons
Keyword(s):  
Vitamin E ◽  
Intracranial Hemorrhage ◽  
Serum Levels ◽  
Tocopheryl Acetate ◽  
Control Group ◽  
Double Blind Study ◽  
Total Hospital ◽  
Double Blind ◽  
Intramuscular Injections ◽  
Grade Ii

A randomized, double-blind study to determine the effect of intramuscular vitamin E on mortality and intracranial hemorrhage (ICH) was performed. One hundred forty-nine neonates with birth weights ≤l000 g and ≤24 hours of age were grouped by weight (501 to 750 g and 751 to 1000 g) and randomized to treatment or control. The treatment group received intramuscular injections of vitamin E (dl-α-tocopherol) on days 1, 2, 4, and 6 of life. The control group received intramuscular injections of placebo on the same schedule. All neonates initially received oral vitamin E (100 mg/kg/day dl-α-tocopheryl acetate), which was subsequently adjusted to keep serum levels at 0.5 to 3.5 mg/dL. Ultrasonographic examinations of the head were performed as possible on days 1, 5 to 7, and 12 to 14. Hemorrhage was defined as mild if less than or equal to grade II ICH, or severe if grade III or IV. No significant differences in neonatal or total hospital mortality between groups were found. However, all ICH, as well as severe ICH, were significantly less in the vitamin E-treated 501 to 750-g subgroup (all ICH: 60% vs 29%; severe ICH: 32% vs 4%). When survivors were analyzed separately, a significant decrease in severe ICH was seen in the vitamin E-treated neonates (25% vs 5%). Necrotizing enterocolitis and sepsis did not occur more frequently in the neonates treated with intramuscular injections of vitamin E. Other than two cases of mild induration at injection sites, no deleterious side effects of treatment were identified. Vitamin E may have a role in the prevention of severe ICH in premature neonates weighing between 501 and 750 g.

scholarly journals Dehydroepiandrosterone Treatment Is Not Beneficial to the Immune Response to Influenza in Elderly Subjects*

1997 ◽  
Vol 82 (9) ◽  
pp. 2911-2914
Author(s):  
H. D. Danenberg ◽  
A. Ben-Yehuda ◽  
Z. Zakay-Rones ◽  
D. J. Gross ◽  
G. Friedman
Keyword(s):  
Immune Response ◽  
Antibody Titer ◽  
Human Subjects ◽  
Serum Levels ◽  
The Elderly ◽  
Elderly Subjects ◽  
Double Blind Study ◽  
Double Blind ◽  
Age Related ◽  
Dhea Treatment

Abstract Background. Dehydroepiandrosterone (DHEA) is a native steroid with an immunomodulating activity that was suggested to counterregulate some phenomena of immunosenescence. Recently, it was shown to reverse the age-associated decline of immune response against influenza vaccine in aged mice. The present study was designed to evaluate the effect of DHEA on the immunization of elderly volunteers against influenza. Methods. Seventy-one elderly volunteers age 61–89 yr were enrolled in a prospective randomized, double-blind study to receive either DHEA (50 mg qd p.o. for four consecutive days starting two days before immunization) or placebo. Antibody response to the vaccine was measured before and 28 days after vaccination. Results. DHEA treatment significantly increased serum DHEA-sulfate (DHEA-S). No enhancement in established immunity was observed. A significant decrease in attainment of protective antibody titer (1:40 or higher) against the A/Texas strain in subjects with nonprotective baseline antibody titer was recorded following DHEA treatment compared with placebo (52% vs. 84%, P &lt; 0.05). Baseline DHEA-S serum levels were inversely related to attainment of immunization in DHEA-treated subjects. Influenza-like morbidity during the winter was low in the study group with no difference between the DHEA and placebo groups. Conclusions. Although highly effective in aged rodents, a short course of DHEA treatment did not improve the age-related declined response to immunization against influenza in human subjects. Higher baseline DHEA-S levels are not predictive of better immunization against influenza in the elderly.

Effects of Astaxanthin Supplementation on Lipid Peroxidation

2007 ◽  
Vol 77 (1) ◽  
pp. 3-11 ◽  
Author(s):  
Karppi ◽  
Rissanen ◽  
Nyyssönen ◽  
Kaikkonen ◽  
Olsson ◽  
...  
Keyword(s):  
Lipid Peroxidation ◽  
Fatty Acids ◽  
Placebo Group ◽  
Intervention Group ◽  
Control Group ◽  
Double Blind Study ◽  
Carotenoid Pigment ◽  
Double Blind

Astaxanthin, the main carotenoid pigment in aquatic animals, has greater antioxidant activity in vitro (protecting against lipid peroxidation) and a more polar configuration than other carotenoids. We investigated the effect of three-month astaxanthin supplementation on lipid peroxidation in healthy non-smoking Finnish men, aged 19–33 years by using a randomized double-blind study design. Also absorption of astaxanthin from capsules into bloodstream and its safety were evaluated. The intervention group received two 4-mg astaxanthin (Astaxin®) capsules daily, and the control group two identical-looking placebo capsules. Astaxanthin supplementation elevated plasma astaxanthin levels to 0.032 μmol/L (p < 0.001 for the change compared with the placebo group). We observed that levels of plasma 12- and 15-hydroxy fatty acids were reduced statistically significantly in the astaxanthin group (p = 0.048 and p = 0.047 respectively) during supplementation, but not in the placebo group and the change of 15-hydroxy fatty acid was almost significantly greater (p = 0.056) in the astaxanthin group, as compared with the placebo group. The present study suggests that intestinal absorption of astaxanthin delivered as capsules is adequate, and well tolerated. Supplementation with astaxanthin may decrease in vivo oxidation of fatty acids in healthy men.

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