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Allman BR, Kreipke VC, Ormsbee MJ. What Else Is in Your Supplement? A Review of the Effectiveness of the Supportive Ingredients in Multi-ingredient Performance Supplements to Improve Strength, Power, and Recovery. Strength Cond J 2015. [DOI: 10.1519/ssc.0000000000000142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kuo YC, Lin JC, Bernard JR, Liao YH. Green tea extract supplementation does not hamper endurance-training adaptation but improves antioxidant capacity in sedentary men. Appl Physiol Nutr Metab 2015; 40:990-6. [PMID: 26319566 DOI: 10.1139/apnm-2014-0538] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The purpose of this study was to investigate the effect of green tea extract (GTE) supplementation combined with endurance training on endurance capacity and performance in sedentary men. Forty untrained men (age: 20 ± 1 years) participated in this study. Subjects were assigned to 1 of 4 treatments: (i) placebo-control (CTRL), (ii) GTE, (iii) endurance training (Ex), and (iv) endurance training with GTE (ExGTE). During the 4-week intervention, exercise training was prescribed as 75% oxygen uptake reserve for three 20-min sessions per week, and either GTE (250 mg/day) or placebo was provided. Endurance capacity, malondialdehyde (MDA), total antioxidant status (TAS), and creatine kinase (CK) were examined. Ex and ExGTE but not GTE improved exhaustive-run time (Ex: +8.2%, p = 0.031; ExGTE: +14.3%, p < 0.001); in addition, Ex and ExGTE significantly increased maximal oxygen uptake by ∼14% (p = 0.041) and ∼17% (p = 0.017) above the values of the CTRL group, respectively. Both Ex and ExGTE significantly decreased the increase of CK by ∼11%-32% below that of CTRL following an exhaustive run (Ex: p = 0.007; ExGTE: p = 0.001). Moreover, TAS levels increased by ∼11% in ExGTE after training (p = 0.040), and GTE, Ex, and ExGTE markedly attenuated exercise-induced MDA production (p = 0.01, p = 0.005, p = 0.011, respectively). In conclusion, this investigation demonstrated that daily ingestion of GTE during endurance training does not impair improvements in endurance capacity. Moreover, endurance training combined with GTE not only increases antioxidant capacity without attenuating endurance training adaptations, but also further attenuates acute exercise-induced CK release.
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Affiliation(s)
- Yu-Chi Kuo
- a Department of Exercise and Health Science, National Taipei University of Nursing and Health Sciences, No. 365, Ming-Te Road, Peitou Distric, Taipei City 11219, Taiwan
| | - Jung-Charng Lin
- b Graduate Institute of Coaching Science, Chinese Culture University, Taipei, Taiwan
| | - Jeffrey R Bernard
- c Department of Kinesiology, California State University, Stanislaus, Turlock, CA 95382, USA
| | - Yi-Hung Liao
- a Department of Exercise and Health Science, National Taipei University of Nursing and Health Sciences, No. 365, Ming-Te Road, Peitou Distric, Taipei City 11219, Taiwan
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Escudero-López B, Berná G, Ortega Á, Herrero-Martín G, Cerrillo I, Martín F, Fernández-Pachón MS. Consumption of orange fermented beverage reduces cardiovascular risk factors in healthy mice. Food Chem Toxicol 2015; 78:78-85. [PMID: 25666657 DOI: 10.1016/j.fct.2015.02.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Revised: 01/10/2015] [Accepted: 02/02/2015] [Indexed: 11/26/2022]
Abstract
The consumption of fruits prevents the risk of cardiovascular diseases. Alcoholic fermentation has been carried out in fruits resulting in products which provide high concentration of bioactive compounds and variable alcohol content. The aim of this study was to assess the potential beneficial effect of an orange beverage obtained by alcoholic fermentation and pasteurization of orange juice on cardiovascular risk biomarkers. For this purpose, four mice groups (n = 8) ingested orange beverage (equivalent volume to 250 mL/day in human), orange juice, alcoholic solution (at the proportional amount of orange beverage) or water during 12 weeks. The equivalent amount to double serving of orange beverage (500 mL/day) was administered to mice in a subsequent intervention, and a control group was also evaluated. Orange beverage consumption increased levels of glutathione and uric acid, improved lipid profile, decreased oxidized LDL and maintained levels of IL-6 and C-reactive protein. Synergistic effects between the bioactive compounds and the alcohol content of orange beverage may occur. The intake of double serving also increased antioxidant enzyme activities, bilirubin content and plasma antioxidant capacity. These results suggest that orange beverage may produce greater protection against cardiovascular risk factors than orange juice in healthy mice.
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Affiliation(s)
- Blanca Escudero-López
- Area of Nutrition and Food Sciences, Department of Molecular Biology and Biochemistry Engineering, Pablo de Olavide University, Carretera de Utrera Km 1, E-41013 Seville, Spain
| | - Genoveva Berná
- Area of Nutrition and Food Sciences, Department of Molecular Biology and Biochemistry Engineering, Pablo de Olavide University, Carretera de Utrera Km 1, E-41013 Seville, Spain; Spanish Biomedical Research Centre in Diabetes and Associated Metabolic Disorders (CIBERDEM), Spain
| | - Ángeles Ortega
- Area of Nutrition and Food Sciences, Department of Molecular Biology and Biochemistry Engineering, Pablo de Olavide University, Carretera de Utrera Km 1, E-41013 Seville, Spain; Spanish Biomedical Research Centre in Diabetes and Associated Metabolic Disorders (CIBERDEM), Spain
| | - Griselda Herrero-Martín
- Area of Nutrition and Food Sciences, Department of Molecular Biology and Biochemistry Engineering, Pablo de Olavide University, Carretera de Utrera Km 1, E-41013 Seville, Spain
| | - Isabel Cerrillo
- Area of Nutrition and Food Sciences, Department of Molecular Biology and Biochemistry Engineering, Pablo de Olavide University, Carretera de Utrera Km 1, E-41013 Seville, Spain; Associated Researcher at Autónoma de Chile University, Av. Pedro de Valdivia 641, Santiago de Chile, Chile
| | - Franz Martín
- Area of Nutrition and Food Sciences, Department of Molecular Biology and Biochemistry Engineering, Pablo de Olavide University, Carretera de Utrera Km 1, E-41013 Seville, Spain; Spanish Biomedical Research Centre in Diabetes and Associated Metabolic Disorders (CIBERDEM), Spain
| | - María-Soledad Fernández-Pachón
- Area of Nutrition and Food Sciences, Department of Molecular Biology and Biochemistry Engineering, Pablo de Olavide University, Carretera de Utrera Km 1, E-41013 Seville, Spain; Associated Researcher at Autónoma de Chile University, Av. Pedro de Valdivia 641, Santiago de Chile, Chile.
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Shi D, Liao S, Guo S, Li H, Yang M, Tang Z. Protective effects of selenium on aflatoxin B1-induced mitochondrial permeability transition, DNA damage, and histological alterations in duckling liver. Biol Trace Elem Res 2015; 163:162-8. [PMID: 25431300 DOI: 10.1007/s12011-014-0189-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 11/19/2014] [Indexed: 01/15/2023]
Abstract
Aflatoxin B1 (AFB1) is a mycotoxin that causes cytotoxicity through oxidative damage to its target organs. The liver is the first target of AFB1 damage. The aim of this study was to evaluate the protective effect of selenium on AFB1-induced hepatic mitochondrial damage in ducklings using molecular biological and histopathological techniques. Aflatoxin was administered via intragastric intubation (0.1 mg/kg body weight), daily for 21 days. The experimental group also received intragastric sodium selenite (1 mg/kg body weight), while the control group was given the same volume of dimethyl sulfoxide (DMSO). Sequence analysis of the mitochondrial DNA D-loop region showed that AFB1 induced damage. All AFB1-administrated ducklings were identified as having D-loop mitochondrial DNA mutations. Mutations were detected in two ducklings that had received both AFB1 and selenium. Mitochondrial swelling assays showed that opening of the mitochondrial permeability transition pores was increased in ducklings that had received AFB1 for 14 and 21 days (P < 0.05). Selenium significantly attenuated these adverse effects of AFB1. After AFB1 exposure, histological alterations were observed, including fat necrosis, steatosis, and formation of lymphoid nodules with infiltrated lymphocytes. These histological abnormalities were also attenuated by treatment with selenium. The overall data indicated that selenium exerts a potent protective effect against AFB1-induced hepatic mitochondrial damage, possibly through its antioxidant activity.
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Affiliation(s)
- Dayou Shi
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China
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Dos Santos JL, Dantas REA, Lima CA, de Araújo SS, de Almeida ECV, Marçal AC, Estevam CDS. Protective effect of a hydroethanolic extract from Bowdichia virgilioides on muscular damage and oxidative stress caused by strenuous resistance training in rats. J Int Soc Sports Nutr 2014; 11:58. [PMID: 25649187 PMCID: PMC4308926 DOI: 10.1186/s12970-014-0058-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 11/17/2014] [Indexed: 12/14/2022] Open
Abstract
Background Natural antioxidants can reduce oxidative damage caused by high-intensity resistance training (RT). We investigated the in vitro antioxidant potential of hydroethanolic extract (HEE) from Bowdichia virgilioides on muscular damage and oxidative stress in rats subjected to high-intensity RT. Methods Thirty-two male Wistar rats were divided into four experimental groups: 1) control group (CG), oral administration (P.O.) of vehicle; 2) trained group (TG), vehicle-treated with RT; 3) B. virgilioides untrained group (BVG), treated with B. virgilioides HEE (200 mg/kg P.O.); and 4) trained B. virgilioides group (TBVG), treated with B. virgiliodes HEE (200 mg/kg P.O.). All animals were habituated to the training apparatus for 1 week. CT and TBVG animals were subjected to the training protocol, which consisted of three sets of 10 repetitions with 75% of the load established using the one-repetition maximum, for four weeks. CG and BVG animals were manipulated and fixed to the apparatus three times a week with no load. Treatment with B. virgilioides HEE or vehicle treatment was initiated after 25 days of RT (5 days; one dose per day). At the end of the experiments, plasmatic and gastrocnemius samples from all groups were obtained for the assessment of lipid peroxidation and creatine kinase activity. Results Compared to TG rats, TBVG rats showed decreases in plasma and gastrocnemius tissue lipid peroxidation by 55.68% (p <0.0001) and 66.61% (p <0.0012), respectively. Further, compared to TG rats TBVG rats showed decreases in plasma and gastrocnemius tissue oxidative stress by 62.83% (p <0.0005) and 54.97% (p <0.0197), respectively. Conclusions B. virgilioides HEE treatment reduced markers of oxidative stress caused by high-intensity RT. Further, HEE treatment during training significantly reduced the markers of tissue damage.
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Affiliation(s)
- Jymmys Lopes Dos Santos
- Postgraduate program in Physical Education, Department of Physical Education, Federal University of Sergipe, São Cristóvão, SE 49100-000 Brazil ; Federal University of Sergipe, Cidade Universitária Prof. José Aloísio de Campos, Department of Morphology, Av. Marechal Rondon s/n, Jardim Rosa Elze, São Cristóvão, Sergipe 49100-000 Brazil
| | - Rafaela Eugênia Arce Dantas
- Federal University of Sergipe, Cidade Universitária Prof. José Aloísio de Campos, Department of Morphology, Av. Marechal Rondon s/n, Jardim Rosa Elze, São Cristóvão, Sergipe 49100-000 Brazil
| | - Clésio Andrade Lima
- Laboratory of Natural Product Chemistry and Biochemistry, Department of Physiology, Federal University of Sergipe, São Cristóvão, SE 49100-000 Brazil
| | - Silvan Silva de Araújo
- Laboratory of Natural Product Chemistry and Biochemistry, Department of Physiology, Federal University of Sergipe, São Cristóvão, SE 49100-000 Brazil
| | - Elis Cristiane Valença de Almeida
- Laboratory of Natural Product Chemistry and Biochemistry, Department of Physiology, Federal University of Sergipe, São Cristóvão, SE 49100-000 Brazil
| | - Anderson Carlos Marçal
- Federal University of Sergipe, Cidade Universitária Prof. José Aloísio de Campos, Department of Morphology, Av. Marechal Rondon s/n, Jardim Rosa Elze, São Cristóvão, Sergipe 49100-000 Brazil
| | - Charles Dos Santos Estevam
- Laboratory of Natural Product Chemistry and Biochemistry, Department of Physiology, Federal University of Sergipe, São Cristóvão, SE 49100-000 Brazil
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Abstract
Supplement use among athletes is widespread, including non-traditional and biological compounds. Despite increasing research, a comprehensive and critical review on polyphenol supplementation and exercise is still lacking. This review is relevant for researchers directly involved in the topic, as well as those with a broad interest in athletic performance enhancement and sports nutrition. The purpose of this review is to present background information on groups of polyphenols and their derivatives because their differing chemical structures influence mechanisms of action; to discuss the potential of plant, fruit and vegetable-based biological supplements, high in polyphenol content, to affect exercise performance and biomarkers of oxidative stress and exercise-induced muscle damage; and to critically discuss the exercise studies and biomarkers used. Subjects in the studies reviewed were either sedentary, healthy individuals, or active, recreationally trained or well-trained athletes. Polyphenol supplementation in exercise studies included mainly extracts (multicomponent or purified), juices, infusions or an increased intake of polyphenol-rich foods. This review includes details of supplement doses and exercise test protocols. Many studies considered only the performance or one or two selected biomarkers of antioxidant capacity instead of a comprehensive choice of biomarkers to assess damage to lipids or proteins. Evidence is insufficient to make recommendations for or against the use of polyphenol supplementation (neither specific polyphenols nor specific doses) for either recreational, competitive or elite athletes. Polyphenols have multiple biological effects, and future exercise studies must be designed appropriately and specifically to determine physiological interactions between exercise and the selected supplement, rather than considering performance alone.
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Affiliation(s)
- Kathryn H Myburgh
- Department of Physiological Sciences, Stellenbosch University, Private Bag X1, Matieland, Stellenbosch, 7602, South Africa,
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Sensitivity to hepatotoxicity due to epigallocatechin gallate is affected by genetic background in diversity outbred mice. Food Chem Toxicol 2014; 76:19-26. [PMID: 25446466 DOI: 10.1016/j.fct.2014.11.008] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 08/06/2014] [Accepted: 11/08/2014] [Indexed: 12/13/2022]
Abstract
Consumer use of herbal and dietary supplements has recently grown in the United States and, with increased use, reports of rare adverse reactions have emerged. One such supplement is green tea extract, containing the polyphenol epigallocatechin gallate (EGCG), which has been shown to be hepatotoxic at high doses in animal models. The Drug-Induced Liver Injury Network has identified multiple patients who have experienced liver injury ascribed to green tea extract consumption and the relationship to dose has not been straightforward, indicating that differences in sensitivity may contribute to the adverse response in susceptible people. The Diversity Outbred (DO), a genetically heterogeneous mouse population, provides a potential platform for study of interindividual toxicity responses to green tea extract. Within the DO population, an equal exposure to EGCG (50 mg/kg; daily for three days) was found to be tolerated in the majority of mice; however, a small fraction of the animals (16%; 43/272) exhibited severe hepatotoxicity (10-86.8% liver necrosis) that is analogous to the clinical cases. The data indicate that the DO mice may provide a platform for informing risk of rare, adverse reactions that may occur in consumer populations upon ingestion of concentrated herbal products.
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Acute ingestion of catechin-rich green tea improves postprandial glucose status and increases serum thioredoxin concentrations in postmenopausal women. Br J Nutr 2014; 112:1542-50. [PMID: 25230741 DOI: 10.1017/s0007114514002530] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Elevated postprandial hyperglycaemia and oxidative stress increase the risks of type 2 diabetes and CVD. Green tea catechin possesses antidiabetic properties and antioxidant capacity. In the present study, we examined the acute and continuous effects of ingestion of catechin-rich green tea on postprandial hyperglycaemia and oxidative stress in healthy postmenopausal women. Participants were randomly assigned into the placebo (P, n 11) or green tea (GT, n 11) group. The GT group consumed a catechin-rich green tea (catechins 615 mg/350 ml) beverage per d for 4 weeks. The P group consumed a placebo (catechins 92 mg/350 ml) beverage per d for 4 weeks. At baseline and after 4 weeks, participants of each group consumed their designated beverages with breakfast and consumed lunch 3 h after breakfast. Venous blood samples were collected in the fasted state (0 h) and at 2, 4 and 6 h after breakfast. Postprandial glucose concentrations were 3 % lower in the GT group than in the P group (three-factor ANOVA, group × time interaction, P< 0·05). Serum concentrations of the derivatives of reactive oxygen metabolites increased after meals (P< 0·05), but no effect of catechin-rich green tea intake was observed. Conversely, serum postprandial thioredoxin concentrations were 5 % higher in the GT group than in the P group (three-factor ANOVA, group × time interaction, P< 0·05). These findings indicate that an acute ingestion of catechin-rich green tea has beneficial effects on postprandial glucose and redox homeostasis in postmenopausal women.
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The effect of green tea extract supplementation on exercise-induced oxidative stress parameters in male sprinters. Eur J Nutr 2014; 54:783-91. [PMID: 25120110 PMCID: PMC4500852 DOI: 10.1007/s00394-014-0757-1] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 08/01/2014] [Indexed: 11/17/2022]
Abstract
Background Although research suggests that antioxidant supplementation can protect against exercise-induced muscle damage and oxidative stress, also delayed post-exercise muscle recovery and hindered adaptation to training were reported in the supplemented athletes.
Purpose The purpose of the study was to evaluate the effects of green tea extract (GTE) supplementation on selected blood markers of oxidative stress and muscle damage in sprinters during preparatory phase of their training cycle. Methods Sixteen sprinters participated in a double-blind, randomized, placebo (PL)-controlled crossover study, including two 4-week treatment periods with PL and GTE (980 mg polyphenols daily). The sprinters performed two repeated cycle sprint tests (RST; 4 × 15 s, with 1-min rest intervals), after PL and GTE supplementation. Blood was sampled before (at rest), 5 min after RST, and after the 24-h recovery. The activities of superoxide dismutase (SOD) and glutathione peroxidase were measured in erythrocytes, and total polyphenols, total antioxidant capacity (TAC), uric acid (UA), albumin (AL), malondialdehyde (MDA), and creatine kinase (CK) were determined in blood plasma. Results Repeated cycle sprint test performed after PL induced an increase in MDA, TAC, and SOD. Moreover, an increase in UA, AL, and CK was observed after RST irrespective of experimental conditions (PL, GTE). Supplementation with GTE caused an increase in total polyphenols and TAC at rest, and a decrease in MDA and SOD after RST. No significant changes in sprint performance were noted after GTE, as compared to PL. Conclusions Supplementation with GTE prevents oxidative stress induced by RST in sprinters. Furthermore, GTE supplementation does not seem to hinder training adaptation in antioxidant enzyme system. On the other hand, neither prevention of exercise-induced muscle damage, nor an improvement in sprint performance is noted after GTE administration.
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Outlaw JJ, Wilborn CD, Smith-Ryan AE, Hayward SE, Urbina SL, Taylor LW, Foster CA. Effects of a pre-and post-workout protein-carbohydrate supplement in trained crossfit individuals. SPRINGERPLUS 2014; 3:369. [PMID: 25110627 PMCID: PMC4125607 DOI: 10.1186/2193-1801-3-369] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Accepted: 07/10/2014] [Indexed: 08/26/2023]
Abstract
PURPOSE The purpose was to assess effects of a pre- and a post-workout protein-carbohydrate supplement on CrossFit-specific performance and body composition. METHODS In an open label randomized study, 13 male and 16 female trained Crossfit participants (mean ± SD; age: 31.87 ± 7.61 yrs, weight: 78.68 ± 16.45 kg, percent body fat: 21.97 ± 9.02) were assessed at 0 and 6 weeks for body composition, VO2max, Wingate peak (WPP) and mean power (WMP), in addition to sport-specific workouts (WOD1: 500 m row, 40 wall balls, 30 push-ups, 20 box jumps, 10 thrusters for time; WOD2: 15 minutes to complete an 800 m run "buy in", followed by as many rounds as possible (AMRAP) of 5 burpees, 10 Kettlebell swings, 15 air squats). The supplement (SUP) group consisted of 19 g of a pre-workout drink (extracts of pomegranate, tart cherry, green and black tea) taken 30 minutes before and a post-workout protein (females: 20 g; males: 40 g) and carbohydrate (females: 40 g; males: 80 g) supplement consumed immediately after each workout. The control (CTL) group consumed only water one hour before or after workouts. Participants completed three (minimum) varied workouts per week at a CrossFit gym as typical to habitual training throughout the six week study. Data were analyzed by repeated measures ANOVA (p <0 .05), 95% Confidence Intervals, and Magnitude Inferences. RESULTS There were no time × group interactions for body composition, WMP, or WOD1 based on ANOVA statistics. VO2MAX, WPP, and WOD2 results revealed that the pre/post supplements were likely beneficial after 95% Confidence Intervals and Magnitude Inferences analysis. CONCLUSION The combination of proprietary supplements taken for 6 weeks may provide benefits during certain sport-specific performance in trained CrossFit athletes but not others.
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Affiliation(s)
- Jordan J Outlaw
- Human Performance Lab, Exercise and Sport Science Department, University of Mary Hardin-Baylor, 900 College Street, Belton, TX 76513 USA
| | - Colin D Wilborn
- Human Performance Lab, Exercise and Sport Science Department, University of Mary Hardin-Baylor, 900 College Street, Belton, TX 76513 USA
| | - Abbie E Smith-Ryan
- Department of Exercise and Sport Science, University of North Carolina Chapel Hill, 209 Fetzer Hall, CB# 8700, Chapel Hill, NC 27599 USA
| | - Sara E Hayward
- Human Performance Lab, Exercise and Sport Science Department, University of Mary Hardin-Baylor, 900 College Street, Belton, TX 76513 USA
| | - Stacie L Urbina
- Human Performance Lab, Exercise and Sport Science Department, University of Mary Hardin-Baylor, 900 College Street, Belton, TX 76513 USA
| | - Lem W Taylor
- Human Performance Lab, Exercise and Sport Science Department, University of Mary Hardin-Baylor, 900 College Street, Belton, TX 76513 USA
| | - Cliffa A Foster
- Human Performance Lab, Exercise and Sport Science Department, University of Mary Hardin-Baylor, 900 College Street, Belton, TX 76513 USA
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Grosso G, Stepaniak U, Topor-Mądry R, Szafraniec K, Pająk A. Estimated dietary intake and major food sources of polyphenols in the Polish arm of the HAPIEE study. Nutrition 2014; 30:1398-403. [PMID: 25280419 PMCID: PMC4192147 DOI: 10.1016/j.nut.2014.04.012] [Citation(s) in RCA: 171] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 04/08/2014] [Accepted: 04/08/2014] [Indexed: 12/30/2022]
Abstract
Objective The aim of this study was to estimate the intake of known individual polyphenols and their major dietary sources in the Polish arm of the HAPIEE (Health, Alcohol and Psychosocial factors In Eastern Europe) study. Methods A total of 10,477 random sample (45–69 y) of urban population of Krakow, Poland, completed a validated 148-item food frequency questionnaire. Polyphenol intake was calculated by matching food consumption data with the recently developed Phenol-Explorer database. Results The mean intake of polyphenols was 1756.5 ± 695.8 mg/d (median = 1662.5 mg/d). The main polyphenol groups were flavonoids (897 mg/d) and phenolic acids (800 mg/d). A total of 347 polyphenols from 19 polyphenol subclasses were found. The individual compounds with the highest intakes were isomers of chlorogenic acid (i.e., 5-caffeoylquinic acid and 4-caffeoylquinic acid) among hydroxycinnamic acids (average intake 150 mg/d), that largely originated from coffee, and compounds belonging to the catechin chemical family (i.e., [+]-gallocatechin, [-]-epigallocatechin 3-O-gallate, and [-]-epicatechin) among flavanols (average intake 50 mg/d), that mostly originated from tea and cocoa products. Conclusions The current study provides the most updated data for individual polyphenols intake in the diet of a well-established nutritional cohort. These findings will be useful to assess potential beneficial role on health of specific foods with high polyphenol content and characterize the effects of individual phenolic compounds.
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Affiliation(s)
- Giuseppe Grosso
- Department of Clinical and Molecular Biomedicine, Section of Pharmacology and Biochemistry, University of Catania, Catania, Italy; Department of Epidemiology and Population Studies, Jagiellonian University Medical College, Krakow, Poland.
| | - Urszula Stepaniak
- Department of Epidemiology and Population Studies, Jagiellonian University Medical College, Krakow, Poland
| | - Roman Topor-Mądry
- Department of Epidemiology and Population Studies, Jagiellonian University Medical College, Krakow, Poland
| | - Krystyna Szafraniec
- Department of Epidemiology and Population Studies, Jagiellonian University Medical College, Krakow, Poland
| | - Andrzej Pająk
- Department of Epidemiology and Population Studies, Jagiellonian University Medical College, Krakow, Poland
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Narotzki B, Reznick AZ, Navot-Mintzer D, Dagan B, Levy Y. Green tea and vitamin E enhance exercise-induced benefits in body composition, glucose homeostasis, and antioxidant status in elderly men and women. J Am Coll Nutr 2014; 32:31-40. [PMID: 24015697 DOI: 10.1080/07315724.2013.767661] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To investigate the effects of green tea plus vitamin E in addition to exercise on body composition and metabolic and antioxidant parameters in healthy elderly individuals. DESIGN Interventional randomized controlled prospective trial. METHODS For 12 weeks, 22 elderly men and women (age: 71.1 ± 1.2 years; body mass index: 28.3 ± 0.5 kg/m(2) [mean ± SE]) undertook 30 minutes of moderately intense walking 6 d/wk. They were randomly assigned to ingest either green tea plus vitamin E (GTVE; 3 cups and 400 IU, respectively; n = 11) or placebo (n = 11). Data on anthropometrics, fasting insulin and glucose levels, physical fitness, dietary intake, safety parameters, and biomarkers of oxidation status were recorded and analyzed at the start and end of the study. RESULTS Though dietary intake was unchanged, improved exercise capacity was followed by a significant reduction in body weight and fasting insulin levels in all participants. Additional consumption of GTVE resulted in a twofold increase in serum vitamin E (from 20.4 to 40.6 μmol/L, p < 0.001) and a decrease of men's and women's waist circumferences (from 100.8 and 95.7 to 96.9 and 85.0 cm, p < 0.05 and p < 0.01, respectively) and fasting glucose levels (from 5.30 to 4.98 mmol/L, p < 0.01). Plasma protein carbonyls dropped (from 0.93 to 0.77 nmol/mg protein, p < 0.05), whereas erythrocyte catalase activities increased (from 26.7 to 29.7 U/g hemoglobin, p < 0.05) in the GTVE group only. Oral peroxidase activities were increased in both groups. CONCLUSIONS A daily dose of GTVE in healthy elderly men and women may improve exercise-induced benefits in body composition and glucose tolerance and may also lower oxidative burden.
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Affiliation(s)
- Baruch Narotzki
- Department of Anatomy and Cell Biology , Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
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Lin SP, Li CY, Suzuki K, Chang CK, Chou KM, Fang SH. Green tea consumption after intense taekwondo training enhances salivary defense factors and antibacterial capacity. PLoS One 2014; 9:e87580. [PMID: 24498143 PMCID: PMC3907556 DOI: 10.1371/journal.pone.0087580] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Accepted: 12/20/2013] [Indexed: 12/15/2022] Open
Abstract
The aim of this study was to investigate the short-term effects of green tea consumption on selected salivary defense proteins, antibacterial capacity and anti-oxidation activity in taekwondo (TKD) athletes, following intensive training. Twenty-two TKD athletes performed a 2-hr TKD training session. After training, participants ingested green tea (T, caffeine 6 mg/kg and catechins 22 mg/kg) or an equal volume of water (W). Saliva samples were collected at three time points: before training (BT-T; BT-W), immediately after training (AT-T; AT-W), and 30 min after drinking green tea or water (Rec-T; Rec-W). Salivary total protein, immunoglobulin A (SIgA), lactoferrin, α-amylase activity, free radical scavenger activity (FRSA) and antibacterial capacity were measured. Salivary total protein, lactoferrin, SIgA concentrations and α-amylase activity increased significantly immediately after intensive TKD training. After tea drinking and 30 min rest, α-amylase activity and the ratio of α-amylase to total protein were significantly higher than before and after training. In addition, salivary antibacterial capacity was not affected by intense training, but green tea consumption after training enhanced salivary antibacterial capacity. Additionally, we observed that salivary FRSA was markedly suppressed immediately after training and quickly returned to pre-exercise values, regardless of which fluid was consumed. Our results show that green tea consumption significantly enhances the activity of α-amylase and salivary antibacterial capacity.
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Affiliation(s)
- Shiuan-Pey Lin
- School of Pharmacy, China Medical University, Taichung, Taiwan
| | - Chia-Yang Li
- Department of Genome Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | | | - Chen-Kang Chang
- Sport Science Research Center, National Taiwan University of Physical Education and Sport, Taichung, Taiwan
| | - Kuei-Ming Chou
- Department of Combat Sports, National Taiwan University of Physical Education and Sport, Taichung, Taiwan
| | - Shih-Hua Fang
- Institute of Athletics, National Taiwan University of Physical Education and Sport, Taichung, Taiwan
- * E-mail:
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64
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Nieman DC, Gillitt ND, Knab AM, Shanely RA, Pappan KL, Jin F, Lila MA. Influence of a polyphenol-enriched protein powder on exercise-induced inflammation and oxidative stress in athletes: a randomized trial using a metabolomics approach. PLoS One 2013; 8:e72215. [PMID: 23967286 PMCID: PMC3744465 DOI: 10.1371/journal.pone.0072215] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2013] [Accepted: 07/04/2013] [Indexed: 01/04/2023] Open
Abstract
Objectives Polyphenol supplementation was tested as a countermeasure to inflammation and oxidative stress induced by 3-d intensified training. Methods Water soluble polyphenols from blueberry and green tea extracts were captured onto a polyphenol soy protein complex (PSPC). Subjects were recruited, and included 38 long-distance runners ages 19–45 years who regularly competed in road races. Runners successfully completing orientation and baseline testing (N = 35) were randomized to 40 g/d PSPC (N = 17) (2,136 mg/d gallic acid equivalents) or placebo (N = 18) for 17 d using double-blinded methods and a parallel group design, with a 3-d running period inserted at day 14 (2.5 h/d, 70% VO2max). Blood samples were collected pre- and post-14 d supplementation, and immediately and 14 h after the third day of running in subjects completing all aspects of the study (N = 16 PSPC, N = 15 placebo), and analyzed using a metabolomics platform with GC-MS and LC-MS. Results Metabolites characteristic of gut bacteria metabolism of polyphenols were increased with PSPC and 3 d running (e.g., hippurate, 4-hydroxyhippurate, 4-methylcatechol sulfate, 1.8-, 1.9-, 2.5-fold, respectively, P<0.05), an effect which persisted for 14-h post-exercise. Fatty acid oxidation and ketogenesis were induced by exercise in both groups, with more ketones at 14-h post-exercise in PSPC (3-hydroxybutyrate, 1.8-fold, P<0.05). Established biomarkers for inflammation (CRP, cytokines) and oxidative stress (protein carbonyls) did not differ between groups. Conclusions PSPC supplementation over a 17-d period did not alter established biomarkers for inflammation and oxidative stress but was linked to an enhanced gut-derived phenolic signature and ketogenesis in runners during recovery from 3-d heavy exertion. Trial Registration ClinicalTrials.gov, U.S. National Institutes of Health, identifier:
NCT01775384
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Affiliation(s)
- David C Nieman
- Human Performance Laboratory, Appalachian State University, North Carolina Research Campus, Kannapolis, North Carolina, United States of America.
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Alm-Eldeen AA, Mona MH, Shati AA, El-Mekkawy HI. Synergistic effect of black tea and curcumin in improving the hepatotoxicity induced by aflatoxin B1 in rats. Toxicol Ind Health 2013; 31:1269-80. [PMID: 23796760 DOI: 10.1177/0748233713491807] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Aflatoxin B1 (AFB1) is a toxic compound commonly found as a contaminant in human food. It is carcinogenic due its potential in inducing the oxidative stress and distortion of the most antioxidant enzymes. Since black tea possesses strong antioxidant activity, it protects cells and tissues against oxidative stress. Curcumin (CMN), a naturally occurring agent, has a combination of biological and pharmacological properties that include antioxidant activity. Therefore, the present study was carried out to investigate the possible role of separate and mixed supplementation of black tea extract and CMN in the hepatotoxicity induced by AFB1 in rats. A total of 48: adult male Sprague Dawley rats were randomly divided into eight groups with six rats in each group. Group 1 (normal control) includes rats that received no treatment. Groups 2, 3, and 4 (positive control) include rats that received olive oil, black tea extract, and CMN, respectively. Group 5 includes rats that received AFB1 at a dose of 750 μg/kg body weight (b.w.) dissolved in olive oil. Groups 6, 7, and 8 include rats that received AFB1 along with 2% black tea extract, CMN at a dose of 200 mg/kg b.w., and both black tea extract and CMN at the same previous doses, respectively. After 90 days, biochemical and histopathological examination was carried out for the blood samples and liver tissues. A significant decrease in the antioxidant enzymes and a significant increase in the lipid peroxidation and hydrogen peroxide in the rats treated with AFB1 were observed. Moreover, there were dramatic changes in the liver function biomarkers, lipid profile, and liver architecture. Supplementation of black tea extract or CMN showed an efficient role in repairing the distortion of the biochemical and histological changes induced by AFB1 in liver. This improvement was more pronounced when both CMN and black tea were used together.
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Affiliation(s)
- Abeer A Alm-Eldeen
- Department of Zoology, Faculty of Science, Tanta University, Tanta, Egypt
| | - Mohamed H Mona
- Department of Zoology, Faculty of Science, Tanta University, Tanta, Egypt
| | - Ali A Shati
- Department of Biology, Faculty of Science, King Khalid University, Abha, Saudi Arabia
| | - Haitham I El-Mekkawy
- Department of Biology, Faculty of Science, King Khalid University, Abha, Saudi Arabia
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66
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Effect of plant foods and beverages on plasma non-enzymatic antioxidant capacity in human subjects: a meta-analysis. Br J Nutr 2013; 109:1544-56. [PMID: 23507127 DOI: 10.1017/s0007114513000263] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Non-enzymatic antioxidant capacity (NEAC) represents a sensitive biomarker measuring the in vivo antioxidant potential of vegetable foods. To evaluate the effectiveness of plant-derived foods and beverages on the plasma non-enzymatic antioxidant system, we analysed all literature published upto May 2010. Data were extracted by two authors independently, and the effect size was summarised using standardised mean differences by a random-effects model. For the analysis, eighty-eight studies were included, reporting a total number of 122 interventions and involving 2890 subjects. There was overall evidence of the effectiveness of fruit, vegetables, dietary patterns based on plant foods, red wine and tea in increasing plasma NEAC. No changes were found for chocolate and fruit juices. We observed an overall effect size three times higher in subjects with risk factors when compared with healthy subjects. Total radical-trapping antioxidant parameter, oxygen radical absorbance capacity and ferric-reducing antioxidant power methods showed a similar increase in plasma NEAC following dietary supplementation, whereas Trolox equivalent antioxidant capacity did not respond to dietary supplementation. Data from the present meta-analysis show that plant-derived foods represent an effective strategy to enhance an endogenous antioxidant network in humans. This is particularly evident in the presence of oxidative stress-related risk factors.
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Dell’agli M, Di Lorenzo C, Badea M, Sangiovanni E, Dima L, Bosisio E, Restani P. Plant Food Supplements with Anti-Inflammatory Properties: A Systematic Review (I). Crit Rev Food Sci Nutr 2012; 53:403-13. [DOI: 10.1080/10408398.2012.682123] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Mario Dell’agli
- a Department of Pharmacological and Biomolecular Sciences , Università degli Studi di Milano , Via Balzaretti 9, 20133 , Milano , Italy
| | - Chiara Di Lorenzo
- a Department of Pharmacological and Biomolecular Sciences , Università degli Studi di Milano , Via Balzaretti 9, 20133 , Milano , Italy
| | - Mihaela Badea
- b Faculty of Medicine , Transilvania University of Brasov, Str. Nicolae Balcescu 56 , Brasov , Romania
| | - Enrico Sangiovanni
- a Department of Pharmacological and Biomolecular Sciences , Università degli Studi di Milano , Via Balzaretti 9, 20133 , Milano , Italy
| | - Lorena Dima
- b Faculty of Medicine , Transilvania University of Brasov, Str. Nicolae Balcescu 56 , Brasov , Romania
| | - Enrica Bosisio
- a Department of Pharmacological and Biomolecular Sciences , Università degli Studi di Milano , Via Balzaretti 9, 20133 , Milano , Italy
| | - Patrizia Restani
- a Department of Pharmacological and Biomolecular Sciences , Università degli Studi di Milano , Via Balzaretti 9, 20133 , Milano , Italy
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Teixeira LG, Lages PC, Jascolka TL, Aguilar EC, Soares FLP, Pereira SS, Beltrão NRM, Matoso RDO, Nascimento AMD, Castilho ROD, Leite JIA. White tea (Camellia sinensis) extract reduces oxidative stress and triacylglycerols in obese mice. FOOD SCIENCE AND TECHNOLOGY 2012. [DOI: 10.1590/s0101-20612012005000099] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
White tea is an unfermented tea made from young shoots of Camellia sinensis protected from sunlight to avoid polyphenol degradation. Although its levels of catechins are higher than those of green tea (derived from the same plant), there are no studies addressing the relationship between this tea and obesity associated with oxidative stress.The objective of this study was to evaluate the effect of white tea on obesity and its complications using a diet induced obesity model. Forty male C57BL/6 mice were fed a high-fat diet to induce obesity (Obese group) or the same diet supplemented with 0.5% white tea extract (Obese + WTE) for 8 weeks. Adipose tissue, serum lipid profile, and oxidative stress were studied. White tea supplementation was not able to reduce food intake, body weight, or visceral adiposity. Similarly, there were no changes in cholesterol rich lipoprotein profile between the groups. A reduction in blood triacylglycerols associated with increased cecal lipids was observed in the group fed the diet supplemented with white tea. White tea supplementation also reduced oxidative stress in liver and adipose tissue. In conclusion, white tea extract supplementation (0.5%) does not influence body weight or adiposity in obese mice. Its benefits are restricted to the reduction in oxidative stress associated with obesity and improvement of hypertriacylglycerolemia.
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Minatti J, Wazlawik E, Hort MA, Zaleski FL, Ribeiro-do-Valle RM, Maraschin M, da Silva EL. Green tea extract reverses endothelial dysfunction and reduces atherosclerosis progression in homozygous knockout low-density lipoprotein receptor mice. Nutr Res 2012; 32:684-93. [PMID: 23084641 DOI: 10.1016/j.nutres.2012.08.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2011] [Revised: 07/31/2012] [Accepted: 08/03/2012] [Indexed: 11/28/2022]
Abstract
The aim of this study was to evaluate the effects of green tea extract (GTE) administration on vascular reactivity and atherosclerosis progression in low-density lipoprotein receptor knockout mice. We hypothesized that GTE intake may ameliorate atherosclerosis by improving endothelial dysfunction. Animals (n = 12 per group) were fed a hypercholesterolemic diet and received either water or GTE at a dose of 50, 100, or 300 mg/kg once a day by gavage (100 μL/10 g weight). After 4 weeks, atherosclerosis extension and vascular reactivity were evaluated in the aorta, and the levels of lipids, monocyte chemotactic protein-1 (MCP-1), and tumor necrosis factor α were measured in the plasma. Administration of GTE at a dose of 50 mg/kg significantly decreased the area of atherosclerotic lesions by 35%, improved the vascular reactivity in the isolated thoracic aorta, and lowered the plasma levels of both MCP-1 and triglycerides. Delivery of 100 mg/kg of GTE only promoted vasocontraction and vasorelaxation (P < .05), whereas a dose of 300 mg/kg was ineffective. Maximum contraction and relaxation negatively correlated with the lesion area (r = -0.755 and -0.767, respectively), whereas the plasma levels of MCP-1 and triglycerides positively correlated with plaque size (r = 0.549 and 0.421, respectively). In summary, our results supported the hypothesis that administration of GTE at low doses may contribute to a decrease in atherosclerosis progression by reversing endothelial dysfunction.
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Affiliation(s)
- Jaqueline Minatti
- Department of Nutrition, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, SC, Brazil
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Silva AA, Ferreira DOL, Santarosa BP, Dias A, Damasceno DC, Gonçalves RC. Effect of percutaneous transthoracic lung biopsy on oxidative metabolism in sheep. J S Afr Vet Assoc 2012; 83:14. [PMID: 23327126 DOI: 10.4102/jsava.v83i1.14] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Accepted: 03/16/2012] [Indexed: 11/01/2022] Open
Abstract
This study aimed to assess the effect of percutaneous transthoracic lung biopsy on the oxidative metabolism of sheep by measuring the oxidative stress markers of superoxide dismutase (SOD), total glutathione (GSH-t), peroxidase (GSH-Px) and thiobarbituric acid reactive substances (TBARS) in the red cells of these animals. Blood samples were collected from 20 clinically healthy sheep prior to, and 30 min after, percutaneous transthoracic lung biopsy. After biopsy, there was a significant decrease (p < 0.05) in SOD and GSH-Px activity, with no significant change (p ≥ 0.05) in GSH-t and TBARS concentrations. These results showed that percutaneous transthoracic lung biopsy did not significantly affect the oxidative metabolism of sheep 30 min after the procedure, which may be used widely in this species without causing serious tissue damage.
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Affiliation(s)
- Andreza A Silva
- Department of Veterinary Clinics, São Paulo State University, Brazil.
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71
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Caturla N, Funes L, Pérez-Fons L, Micol V. A randomized, double-blinded, placebo-controlled study of the effect of a combination of lemon verbena extract and fish oil omega-3 fatty acid on joint management. J Altern Complement Med 2012; 17:1051-63. [PMID: 22087615 DOI: 10.1089/acm.2010.0410] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES The aim of this study was to test the efficacy of an antioxidant/anti-inflammatory supplement containing standardized lemon verbena (Aloysia triphylla, Lippia citriodora) extract and fish oil omega-3 fatty acid in a human pilot trial as an alternative treatment for joint management. METHODS AND DESIGN First, antioxidant activity of the supplement was determined through an oxygen radical absorbance capacity (ORAC) assay. In a randomized, double-blinded placebo-controlled trial, 45 subjects with pain discomfort received the nutritional supplement or placebo for 9 weeks. Western Ontario MacMaster (WOMAC) and Lequesne's questionnaires, which are disease-specific measurements validated to measure joint dysfunction and pain, were administered and evaluated once per week in the placebo and intervention groups. OUTCOME MEASURES Pain and stiffness symptoms, and joint function were determined once per week through recording their respective WOMAC and Lequesne's scores in the placebo and intervention groups. Statistically significant differences were determined at every measurement point between the two groups. RESULTS Lemon verbena extract showed strong antioxidant properties as measured by the ORAC assay. The nutritional supplement containing standardized lemon verbena extract (14% verbascoside, w/w) and fish oil omega-3 fatty acid reduced symptoms of pain and stiffness significantly, and improved physical function as shown by WOMAC and Lequesne's scores after 9 weeks of treatment. WOMAC and Lequesne's total scores decreased 53% and 78%, respectively, at the end of the study compared to initial conditions. Onset of the effect was observed at the third and fourth weeks, when statistically significant differences were detected, compared to placebo. CONCLUSIONS This pilot study reveals that supplementation with lemon verbena combined with omega-3 fatty acids may be considered for further investigation as a complementary and alternative treatment for improving joint status in subjects with joint discomfort.
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Green tea extract supplementation gives protection against exercise-induced oxidative damage in healthy men. Nutr Res 2012; 31:813-21. [PMID: 22118751 DOI: 10.1016/j.nutres.2011.09.020] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Revised: 09/08/2011] [Accepted: 09/29/2011] [Indexed: 01/14/2023]
Abstract
The purpose of this study was to evaluate the effects of a long-term (4-week) green tea extract (GTE) supplementation in combination with strength training on selected blood markers of oxidative stress and muscular damage after a short-term exercise in previously untrained men. We hypothesized that GTE supplementation would elevate antioxidant potential and attenuate exercise-induced oxidative stress and muscular damage. Thirty-five male students were exposed to 4 weeks of strength training and received (in a randomized, double-blind design) GTE (n = 17; 640 mg polyphenols/d) or placebo (P; n = 18). Before (term I) and after 4 weeks of strength training and supplementation (term II), students performed a short-term muscular endurance test. Blood samples were collected at rest, 5 minutes after the muscular endurance test, and after 24 hours of recovery. Supplementation with GTE enhanced plasma total polyphenols at rest and 5 minutes after the muscular endurance test. Supplementation also contributed to the rise of resting total antioxidant status in plasma. Throughout the experiment (terms I and II), a reduction in plasma lipid hydroxyperoxides was observed 24 hours after the muscular endurance test. Four weeks of strength training resulted in an increase in plasma lipid hydroxyperoxides at rest, but only in the P group. In term I, the muscular endurance test induced an increase in activity of creatine kinase in plasma after 24 hours of recovery in both the P and GTE groups. In term II, plasma creatine kinase activity after 24 hours of recovery was elevated only in the P group. In conclusion, in previously untrained men, dietary supplementation with GTE (in combination with strength training) enhances the antioxidant defense system in plasma at rest and, in turn, may give protection against oxidative damage induced by both short-term muscular endurance test and long-term strength training.
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Effects of grape seed extract supplementation on exercise-induced oxidative stress in rats. Br J Nutr 2011; 108:249-56. [PMID: 22011589 DOI: 10.1017/s0007114511005496] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The aim of the present study was to investigate the effects of grape seed extract (GSE) supplementation on exercise performance and oxidative stress in acutely and chronically exercised rats. A total of sixty-four male rats were used in the study. Rats were divided into six groups: control, chronic exercise control, acute exercise control (AEC), GSE-supplemented control, GSE-supplemented chronic exercise and GSE-supplemented acute exercise groups. Chronic exercise consisted of treadmill running at 25 m/min, 45 min/d, 5 d a week for 6 weeks. Rats in the acute exercise groups were run on the treadmill at 30 m/min until exhaustion. GSE were given at 100 mg/kg of body weight with drinking water for 6 weeks. Plasma was separated from blood samples for the analysis of oxidative stress markers. There was no significant difference in time of exhaustion between the acute exercise groups. Plasma malondialdehyde (MDA) levels were higher in the acute exercise groups and lower in the chronic exercise groups. GSE supplementation decreased MDA levels. Xanthine oxidase and adenosine deaminase activities were higher in the AEC group compared to all the other groups. NO levels were increased with both chronic exercise and GSE supplementation. Superoxide dismutase and glutathione peroxidase activities were lower in the acute exercised groups and higher in the chronic exercised groups. GSE supplementation caused an increase in antioxidant enzyme activities. In conclusion, GSE supplementation prevents exercise-induced oxidative stress by preventing lipid peroxidation and increasing antioxidant enzyme activities.
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Ellinger S, Müller N, Stehle P, Ulrich-Merzenich G. Consumption of green tea or green tea products: is there an evidence for antioxidant effects from controlled interventional studies? PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2011; 18:903-915. [PMID: 21802928 DOI: 10.1016/j.phymed.2011.06.006] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Revised: 02/16/2011] [Accepted: 06/09/2011] [Indexed: 05/31/2023]
Abstract
PURPOSE Epidemiological data suggest that green tea (GT) consumption may protect against cardiovascular diseases (CVDs) and different types of cancer. This effect is attributed primarily to the antioxidant properties of flavanols from GT. This review provides an overview of controlled intervention studies investigating the effect of GT consumption on antioxidant effects ex vivo and in vivo. METHODS The Medline and Cochrane databases were searched independently by two investigators for controlled intervention studies (English) on GT consumption and antioxidant effects published up to June 2010. Thirty-one studies investigating antioxidant effects ex vivo [plasma antioxidant capacity (AC), DNA's resistance against oxidative induced damage) or in vivo (lipid and protein oxidation, DNA damage] met the criteria. Results were compared by considering the participants, the dose of GT, the amount of ingested flavanols, the duration of supplementation and the investigated biomarkers. RESULTS The comparison between the studies was difficult as relevant data, e.g., on flavanol concentration in plasma (10 of 31 studies) or on major antioxidants contributing to AC, were often missing. Lipid peroxidation and DNA damage were commonly investigated. Data on protein oxidation are scarce. An antioxidant effect of at least one parameter (increase in AC or reduction of oxidative stress marker) was observed in 15 out of 22 studies by daily consumption of GT, primarily in participants exposed to oxidative stress (smokers or mixed collectives of smokers and non-smokers and physical activity) and in 6 out of 9 studies investigating the bolus consumption of GT. CONCLUSION There is limited evidence that regular consumption of GT in amounts of at least 0.6-1.5 l/day may increase AC and reduce lipid peroxidation (especially oxidation of LDL). This may contribute to the protection against CVDs and different types of cancer. Beneficial effects seem to be more likely in participants exposed to oxidative challenge.
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Affiliation(s)
- S Ellinger
- Department of Nutrition and Food Science-Nutritional Physiology, University of Bonn, D-53115 Bonn, Germany.
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Hirota R, Ngatu NR, Miyamura M, Nakamura H, Suganuma N. Goishi tea consumption inhibits airway hyperresponsiveness in BALB/c mice. BMC Immunol 2011; 12:45. [PMID: 21831323 PMCID: PMC3173379 DOI: 10.1186/1471-2172-12-45] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Accepted: 08/11/2011] [Indexed: 11/10/2022] Open
Abstract
Background Airway hyperresponsiveness (AHR) is one of the important traits that characterize bronchial asthma. Goishi tea is a post-heating fermented tea that has been reported to have higher free radical scavenging activity. In this study, we evaluated the prophylactic effects of Goishi tea on AHR in BALB/c mice. Results The number of inflammatory cells in BAL fluid was considerably reduced in Goishi tea/Der f and Gallic acid/Der f groups as compared with Tap water/Der f group. Regarding inflammatory cells in BAL, a significant reduction of eosinophils and neutrophils was observed in Goishi tea-treated mice (p < 0.01), as well as in the Gallic acid/Der f group (p < 0.05), as compared with Tap water/Der f group. In asthmatic mice (Tap water/Der f group), the intensity of airway resistance increased simultaneously with the increase in acetylcholine concentration in a dose-dependant way. AHR was significantly inhibited in Goishi tea/Der f and Gallic acid/Der f (p < 0.01) groups as compared with the Tap water/Der f group. Regarding serum specific-IgG1, significantly lower levels of this antibody were observed in Goishi tea/Der f and Gallic acid/Der f groups as compared with the Tap water/Der f group (p < 0.05). In addition, adiponectin level was significantly higher in the Goishi tea group as compared with the Tap water treated mice (p < 0.01). Conclusions The results suggest that Goishi tea consumption exerted an inhibitory effect on eosinophilic and neutrophilic infiltration in the lung, attenuated the increase in airway resistance and increased the production of adiponectin; thus reducing Der f induced allergic inflammatory process in mice.
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Affiliation(s)
- Ryoji Hirota
- Department of Environmental Medicine, Kochi Medical School, Kochi University, Japan.
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The putative effects of green tea on body fat: an evaluation of the evidence and a review of the potential mechanisms. Br J Nutr 2011; 106:1297-309. [DOI: 10.1017/s0007114511003849] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The increase in the prevalence of obesity in recent years has prompted research into alternative methods of modulating body weight and body fat. The last decade has reflected this with a surge in studies investigating the potential of green tea as a natural agent of weight loss, with a view to confirming and elucidating the mechanisms underlying its effect on the body. Currently, it is widely believed that the polyphenolic components present in green tea have an anti-obesogenic effect on fat homeostasis, by increasing thermogenesis or reducing fat absorption among other ways. The data published to date, however, are inconsistent, with numerous putative modes of action suggested therein. While several unimodal mechanisms have been postulated, a more plausible explanation of the observed results might involve a multimodal approach. Such a mechanism is suggested here, involving simultaneous inhibition of the enzymes catechol-O-methyltransferase, acetyl-CoA carboxylase, fatty acid synthase and impeding absorption of fat via the gut. An evaluation of the available evidence supports a role of green tea in weight loss; however the extent of the effects obtained is still subject to debate, and requires more objective quantification in future research.
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Zheng XX, Xu YL, Li SH, Liu XX, Hui R, Huang XH. Green tea intake lowers fasting serum total and LDL cholesterol in adults: a meta-analysis of 14 randomized controlled trials. Am J Clin Nutr 2011; 94:601-10. [PMID: 21715508 DOI: 10.3945/ajcn.110.010926] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND The effect of green tea beverage and green tea extract on lipid changes is controversial. OBJECTIVE We aimed to identify and quantify the effect of green tea and its extract on total cholesterol (TC), LDL cholesterol, and HDL cholesterol. DESIGN We performed a comprehensive literature search to identify relevant trials of green tea beverages and extracts on lipid profiles in adults. Weighted mean differences were calculated for net changes in lipid concentrations by using fixed-effects or random-effects models. Study quality was assessed by using the Jadad score, and a meta-analysis was conducted. RESULTS Fourteen eligible randomized controlled trials with 1136 subjects were enrolled in our current meta-analysis. Green tea consumption significantly lowered the TC concentration by 7.20 mg/dL (95% CI: -8.19, -6.21 mg/dL; P < 0.001) and significantly lowered the LDL-cholesterol concentration by 2.19 mg/dL (95% CI: -3.16, -1.21 mg/dL; P < 0.001). The mean change in blood HDL-cholesterol concentration was not significant. Subgroup and sensitivity analyses showed that these changes were not influenced by the type of intervention, treatment dose of green tea catechins, study duration, individual health status, or quality of the study. Overall, no significant heterogeneity was detected for TC, LDL cholesterol, and HDL cholesterol; and results were reported on the basis of fixed-effects models. CONCLUSION The analysis of eligible studies showed that the administration of green tea beverages or extracts resulted in significant reductions in serum TC and LDL-cholesterol concentrations, but no effect on HDL cholesterol was observed.
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Affiliation(s)
- Xin-Xin Zheng
- Key Laboratory for Clinical Cardiovascular Genetics and Sino-German Laboratory for Molecular Medicine, Cardiovascular Institute, FuWai Hospital, Chinese Academy of Medical Sciences, Beijing, China
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Effect of quercetin and glucuronide metabolites on the monoamine oxidase-A reaction in mouse brain mitochondria. Nutrition 2011; 27:847-52. [DOI: 10.1016/j.nut.2010.09.002] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2010] [Revised: 09/03/2010] [Accepted: 09/03/2010] [Indexed: 12/24/2022]
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79
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Khatiwada J, Verghese M, Davis S, Williams LL. Green tea, phytic acid, and inositol in combination reduced the incidence of azoxymethane-induced colon tumors in Fisher 344 male rats. J Med Food 2011; 14:1313-20. [PMID: 21501094 DOI: 10.1089/jmf.2010.0302] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Experimental as well as epidemiologic studies in human populations provide evidence that consumption of phytochemicals reduces the incidence of degenerative diseases. Green tea (GT) catechins are known for their antioxidative potential. Phytic acid (PA) also acts as a natural antioxidant and may have numerous health benefits. This experiment was designed to investigate the inhibitory effects of combinations of 1% and 2% GT, PA, and inositol (I) in reducing the incidence of azoxymethane-induced colon tumors in Fisher 344 male rats. After an acclimatization period of 1 week, nine groups of rats (15 rats per group) were initially assigned to consume AIN 93 G diet and later AIN 93 M diet after 20 weeks of age. Treatments were given in drinking water. All rats received azoxymethane injections (16 mg/kg of body weight) subcutaneously at 7 and 8 weeks of age. Rats were killed at 45 weeks of age by CO(2) euthanasia. Tumor incidence (93.76%) and the number of tumors per tumor-bearing rat ratio (2.25) were significantly (P<.05) higher in the control group compared with treatment groups. Glutathione S-transferase activity was significantly (P<.05) higher in rats fed combinations of 2% GT+PA+I and GT+PA (33.25 ± 1.23 and 29.83 ± 1.10 μmol/mL, respectively) compared with other groups. These findings suggest that the synergistic effect of the 2% level of GT, PA, and I may reduce the incidence of colon tumors and therefore have potential as a chemopreventive agent.
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Affiliation(s)
- Janak Khatiwada
- Center for Excellence in Post-Harvest Technologies, North Carolina A&T State University, Kannapolis, North Carolina 28081-4332, USA.
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80
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Serafini M, Rio D, N’Dri Y, Bettuzzi S, Peluso I. Health Benefits of Tea. OXIDATIVE STRESS AND DISEASE 2011. [DOI: 10.1201/b10787-13] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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81
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Ameen Abdulmajeed N. Therapeutic ability of some plant extracts on aflatoxin B1 induced renal and cardiac damage. ARAB J CHEM 2011. [DOI: 10.1016/j.arabjc.2010.06.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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82
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Wang HC, Brumaghim JL. Polyphenol Compounds as Antioxidants for Disease Prevention: Reactive Oxygen Species Scavenging, Enzyme Regulation, and Metal Chelation Mechanisms in E. coliand Human Cells. ACS SYMPOSIUM SERIES 2011. [DOI: 10.1021/bk-2011-1083.ch005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Hsiao C. Wang
- Chemistry Department, Clemson University, Clemson, South Carolina 29634-0973
| | - Julia L. Brumaghim
- Chemistry Department, Clemson University, Clemson, South Carolina 29634-0973
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83
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Abdeen SM, Mathew TC, Dashti HM, Asfar S. Protective effects of green tea on intestinal ischemia-reperfusion injury. Nutrition 2010; 27:598-603. [PMID: 21167681 DOI: 10.1016/j.nut.2010.05.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2009] [Revised: 03/04/2010] [Accepted: 05/25/2010] [Indexed: 10/18/2022]
Abstract
OBJECTIVE The intestinal mucosa is known to be adversely affected by ischemia-reperfusion (I/R). Previously we showed that green tea protects the intestinal mucosa from fasting-induced damage. The aim of this study is to determine whether green tea has any protective role in I/R of the intestine. METHODS Three groups of male rats were used in this study. Group I (I/R) underwent I/R of the intestine (30 min of ischemia followed by 1 h of reperfusion). Group II (green tea + I/R) was given green tea for 2 wk before inducing I/R. Group III (control) had sham I/R. After the experiments, the jejunum was removed and the tissues were processed for histopathologic examination and immunohistochemical analysis for cell proliferation markers and antioxidant enzymes. RESULTS The intestinal mucosa in group II was preserved compared with that in group I. The expressions of cellular proliferation markers (proliferating cell nuclear antigen and Ki-67) and cellular antioxidants (superoxide dismutase and catalase) in group II were similar to those in group III and much less than in group I, reflecting the protective effects of green tea in group II animals. CONCLUSION In this animal model, administration of green tea before inducing I/R protects the intestinal mucosa from injury.
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Affiliation(s)
- S M Abdeen
- Department of Pathology, Faculty of Medicine, Kuwait University, Safat, Kuwait
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84
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Chang WH, Hu SP, Huang YF, Yeh TS, Liu JF. Effect of purple sweet potato leaves consumption on exercise-induced oxidative stress and IL-6 and HSP72 levels. J Appl Physiol (1985) 2010; 109:1710-5. [DOI: 10.1152/japplphysiol.00205.2010] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to evaluate the effects of purple sweet potato leaves (PSPL) consumption on oxidative stress markers in a healthy, nontrained, young male population after completing a running exercise protocol. A crossover design was applied, with 15 subjects participating in a two-step dietary intervention period. Each subject was given a high- (PSPL group) or low-polyphenol (control group) diet for 7 days with a 14-day washout period. After each dietary intervention period, all subjects performed 1 h of treadmill running at a speed corresponding to 70% of each subject's individual maximal oxygen uptake (V̇o2max). Blood samples were taken before exercise and at 0, 1, and 3 h after exercise. Compared with the control group, PSPL consumption significantly increased plasma total polyphenols concentration and total antioxidant power (i.e., the ferric-reducing ability of plasma) in the PSPL group. The markers of oxidative damage, plasma TBARS and protein carbonyl, significantly decreased. Plasma IL-6 concentration also decreased. However, no significant difference was found in HSP72 levels between the two groups. These findings indicate that consuming a high-polyphenol diet for 7 days can modulate antioxidative status and decrease exercise-induced oxidative damage and pro-inflammatory cytokine secretion.
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Affiliation(s)
- Wen-Hsin Chang
- School of Nutrition and Health Sciences, Taipei Medical University, Taipei, Taiwan
| | - Shene-Pin Hu
- School of Nutrition and Health Sciences, Taipei Medical University, Taipei, Taiwan
| | - Ying-Fen Huang
- School of Nutrition and Health Sciences, Taipei Medical University, Taipei, Taiwan
| | - Tzu-Shao Yeh
- School of Nutrition and Health Sciences, Taipei Medical University, Taipei, Taiwan
| | - Jen-Fang Liu
- School of Nutrition and Health Sciences, Taipei Medical University, Taipei, Taiwan
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Abstract
Flavonoids are a large class of naturally occurring compounds widely present in fruits, vegetables and beverages derived from plants. These molecules have been reported to possess a wide range of activities in the prevention of common diseases, including CHD, cancer, neurodegenerative diseases, gastrointestinal disorders and others. The effects appear to be related to the various biological/pharmacological activities of flavonoids. A large number of publications suggest immunomodulatory and anti-inflammatory properties of these compounds. However, almost all studies are in vitro studies with limited research on animal models and scarce data from human studies. The majority of in vitro research has been carried out with single flavonoids, generally aglycones, at rather supraphysiological concentrations. Few studies have investigated the anti-inflammatory effects of physiologically attainable flavonoid concentrations in healthy subjects, and more epidemiological studies and prospective randomised trials are still required. This review summarises evidence for the effects of fruit and tea flavonoids and their metabolites in inflammation and immunity. Mechanisms of effect are discussed, including those on enzyme function and regulation of gene and protein expression. Animal work is included, and evidence from epidemiological studies and human intervention trials is reviewed. Biological relevance and functional benefits of the reported effects, such as resistance to infection or exercise performance, are also discussed.
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86
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Effect of lemon verbena supplementation on muscular damage markers, proinflammatory cytokines release and neutrophils’ oxidative stress in chronic exercise. Eur J Appl Physiol 2010; 111:695-705. [DOI: 10.1007/s00421-010-1684-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2010] [Indexed: 11/27/2022]
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87
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Abstract
The 'Total antioxidant capacity' (TAC) is a parameter frequently used for characterization of food products and of the antioxidant status of the body. This mini-review shows shortcomings of TAC assays and points of concern that should be considered when performing and interpreting results of such assays. The term TAC is not optimal since the assay measures only part of antioxidant capacity, usually excluding enzymatic activities. Antioxidant and oxidant-regenerating enzymes in blood cells and the blood vessel wall have a profound impact on the antioxidant properties of blood plasma, which is not reflected in the in vitro assays of isolated plasma. The term 'Non-enzymatic antioxidant capacity' (NEAC) is suggested as more relevant than TAC. NEAC is estimated by various methods, which yield different values and results obtained using different methods do not always show satisfactory correlation. One reason for the discrepancy of results is the use of different oxidants in NEAC assays. The use of hydroxyl radical as the oxidant is not recommended in view of the high and non-specific reactivity of this species.
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A gel-based proteomic analysis of the effects of green tea polyphenols on ovariectomized rats. Nutrition 2010; 27:681-6. [PMID: 20708377 DOI: 10.1016/j.nut.2010.05.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 05/30/2010] [Accepted: 05/30/2010] [Indexed: 02/07/2023]
Abstract
OBJECTIVE Our recent study demonstrated the protective action of green tea polyphenols (GTPs) against bone loss in ovariectomized (OVX) rats through their antioxidant capacities to scavenge reactive oxygen species. The objective of the present study was to evaluate the alterations of liver protein profiles in estrogen-deficient middle-aged rats after GTP treatment by a gel-based proteomic approach. This may lead to understanding the mechanisms of GTPs in promoting bone health. METHODS Liver samples were obtained from 14-mo-old female OVX rats treated with no GTPs (OVX) or 0.5% (w/v) GTPs (OVX + GTP) in drinking water for 16 wk (n = 10/group). Two-dimensional difference gel electrophoresis combined with mass spectrometry was used to compare the liver protein profiles of pooled samples from the OVX and OVX + GTP groups. Liver proteins were labeled in duplicate by reversing the fluorescent dyes. RESULTS Approximately 800 protein spots were detected. The expression levels of superoxide dismutase-1 and adenosine triphosphate synthase were 2.0-fold and 1.5-fold higher in the OVX + GTP group versus the OVX group, respectively, whereas the expression level of catechol-O-methyltransferase was 1.5-fold lower in the OVX + GTP group versus the OVX group. The changes of superoxide dismutase-1 and catechol-O-methyltransferase in individual liver samples were confirmed by western blots. CONCLUSION Our data provide further evidence for the antioxidant role of GTPs by increasing superoxide dismutase-1 and adenosine triphosphate synthase and the estrogen-associated effect of GTPs by decreasing catechol-O-methyltransferase.
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Kang KW, Oh SJ, Ryu SY, Song GY, Kim BH, Kang JS, Kim SK. Evaluation of the total oxy-radical scavenging capacity of catechins isolated from green tea. Food Chem 2010. [DOI: 10.1016/j.foodchem.2010.01.055] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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90
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Lu JL, Wu MY, Yang XL, Dong ZB, Ye JH, Borthakur D, Sun QL, Liang YR. Decaffeination of tea extracts by using poly(acrylamide-co-ethylene glycol dimethylacrylate) as adsorbent. J FOOD ENG 2010. [DOI: 10.1016/j.jfoodeng.2009.11.018] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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91
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TOH KAZUKO, YOKOYAMA HIDEKATSU, NODA HIROYUKI, YUGUCHI YOSHIAKI. ANTIOXIDANT CAPACITY OF LIGNIN FROM GREEN TEA WASTE. J Food Biochem 2010. [DOI: 10.1111/j.1745-4514.2009.00324.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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92
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KALAFATI MARIA, JAMURTAS ATHANASIOSZ, NIKOLAIDIS MICHALISG, PASCHALIS VASSILIS, THEODOROU ANASTASIOSA, SAKELLARIOU GIORGOSK, KOUTEDAKIS YIANNIS, KOURETAS DIMITRIS. Ergogenic and Antioxidant Effects of Spirulina Supplementation in Humans. Med Sci Sports Exerc 2010; 42:142-51. [DOI: 10.1249/mss.0b013e3181ac7a45] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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93
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Clement Y. Can green tea do that? A literature review of the clinical evidence. Prev Med 2009; 49:83-7. [PMID: 19465043 DOI: 10.1016/j.ypmed.2009.05.005] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2009] [Revised: 05/01/2009] [Accepted: 05/16/2009] [Indexed: 01/15/2023]
Abstract
OBJECTIVE Habitual green tea consumption has long been associated with health benefits including chemoprevention and cardiovascular protection. This non-systematic literature review presents the clinical evidence to date. METHOD A literature review of peer-reviewed articles on observational and interventional studies was conducted to include green tea, its extract or its purified polyphenol (-)-epigallocatechin-3-gallate (EGCG). Electronic databases searched included PubMed (1966-2009) and the Cochrane Library (Issue 4, 2008). RESULTS Observational studies are inconclusive on the benefits of habitual consumption of green tea in the prevention of most cancers. However, there are trends towards prevention in breast and prostate cancers. Interventional studies have demonstrated reduction in relapses following surgical resection in colorectal adenomas and increased survival rates in epithelial ovarian cancer. Observational studies indicate that green tea may provide protection against hypertension and reduce the risk for stroke, and interventional studies are providing biochemical and physiological evidence. CONCLUSION Although the overall clinical evidence is inconclusive, habitual green tea consumption may be providing some level of chemoprevention in prostate and breast cancer. Green tea may also attenuate the risk factors association with the development of atherosclerosis thus reducing the incidence of cardiovascular events and stoke.
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Affiliation(s)
- Yuri Clement
- Pharmacology Unit, Faculty of Medical Sciences, The University of the West Indies, St. Augustine, Trinidad and Tobago.
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Abstract
Physical training is known to induce a biochemical adaptive response which might require an increase in the ingestion and/or the absorption of micronutrients. A question that is still being raised is whether acute or chronic exercise modifies antioxidant requirements. First, the present review brings to light the most crucial studies on the topic. Second, it interprets the established relationships between antioxidant micronutrient intakes and the adaptive response of antioxidant systems. Finally, it exposes the major questions connected with antioxidant micronutrient requirements for athletes. To this effect, the training-load interaction with nutrition is taken into account. As oxidative stress cannot be avoided, the imbalance between oxidants and antioxidants can be alleviated to minimise oxidative damage and outcomes. There is growing evidence that one specific antioxidant cannot by itself prevent oxidative stress-induced damage, as direct adverse effects of supplementation are attributed to undesirable synergic effects. Other effects can be supposed that limit the endogenous adaptive effect of training. High doses of antioxidant supplements can minimise the effects of radical oxygen species themselves or generate pro-oxidant effects. Effects are only exhibited when nutritional status is deficient. There are no convincing effects of supplementation in well-trained athletes. Risk/benefit analysis emerges on evidence for an unknown risk of supranutritional intakes, a supposed impairment of adaptive effects and a still unknown long-term risk. Appropriate status can be achieved by a diversified and balanced diet, adapted to specific needs, by awareness of high-density food intakes (avoiding products containing a low density of micronutrients).
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M. Mohamed A, S. Metwall N. Antiaflatoxigenic Activities of Some Plant Aqueous Extracts Against Aflatoxin-B1 Induced Renal and Cardiac Damage. ACTA ACUST UNITED AC 2008. [DOI: 10.3923/jpt.2009.1.16] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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