Consumption of green tea favorably affects oxidative stress markers in weight-trained men

Panza, Vilma Simões Pereira; Wazlawik, Elisabeth; Schütz, Gustavo Ricardo; Comin, Leandro; Hecht, K; Silva, Edson Luiz da

doi:10.1016/j.nut.2008.01.009

Cited by 121 publications

(96 citation statements)

References 48 publications

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“…Studies examining the effects of green tea consumption on exercise-induced oxidative stress and exercise metabolism in humans are rather scarce and results of these studies are often inconclusive [16,20]. Previous studies have generally found that antioxidant supplements do not improve performance; however, there are many reports that exogenous antioxidant supplements may strengthen antioxidant defense system in healthy exercising humans and limit or even prevent the exercise-induced tissue damage or help the sportsmen to recover from the damage [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Blood serum DSC analysis of well-trained men response to CrossFit training and green tea extract supplementation

Michnik

Sadowska-Krępa

Domaszewski

et al. 2017

J Therm Anal Calorim

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Differential scanning calorimetry (DSC) has been used for the detection of post-exercise changes in blood serum resulting from participation in the CrossFit (CF) training combined with green tea extract (GTE) supplementation. Blood samples from 20 well-trained men were collected at rest, immediately post-exercise and after 1 h of recovery in two trials: first before and second after CF training combined with GTE or placebo administration in the supplemented (S) and control (C) groups, respectively. Selected muscle damage biomarkers have been compared in different phases of the experiment. A significant increase in blood lactate content has been observed post-exercise in both trials in both participants' groups. The opposite trends have been noted for the C and S groups in creatine kinase (CK) activity changes recorded during the first to the second trial: an increase in CK for the control and a decrease for the supplemented group in all phases of the experiment: pre-exercise, post-exercise and after recovery. In the second trial, all CK values for the S group have been found significantly lower than the corresponding values recorded in the C group. These results suggest a mitigate effect of GTE supplementation on post-training muscle damage. DSC results did not reveal clear effects of training nor GTE supplementation on serum denaturation transition. However, interesting dependences of thermodynamic parameters describing this transition have been observed in different phases of the experiment. Statistically significant negative correlations have been found between post-training VO 2max and post-exercise thermodynamic parameters associated with haptoglobin contribution to serum denaturation transition.

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Section: Introductionmentioning

confidence: 99%

Blood serum DSC analysis of well-trained men response to CrossFit training and green tea extract supplementation

Michnik

Sadowska-Krępa

Domaszewski

et al. 2017

J Therm Anal Calorim

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“…The catechins have been classified based on the number of hydroxyl groups within their chemical structures, including epicatechin (EC), gallocatechin, epigallocatechin (EGC), catechin gallate, gallocatechin gallate, epicatechin gallate (ECG), and epigallocatechin gallate (EGCG) (Higdon and Frei 2003;Hodgson et al 2013). Although many studies report positive effects of GTE on attenuating oxidative stress (Murase et al 2008;Panza et al 2008;Haramizu et al 2011) and improving endurance capacity (Murase et al , 2006Richards et al 2010), not all studies agree (Eichenberger et al 2009(Eichenberger et al , 2010. Moreover, to date, there is still little known about whether endurance training combined with GTE ingestion would impair the gain in endurance capacity following training in a sedentary population.…”

Section: Introductionmentioning

confidence: 99%

Green tea extract supplementation does not hamper endurance-training adaptation but improves antioxidant capacity in sedentary men

Kuo

Lin

Bernard

et al. 2015

Appl. Physiol. Nutr. Metab.

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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 ϳ14% (p = 0.041) and ϳ17% (p = 0.017) above the values of the CTRL group, respectively. Both Ex and ExGTE significantly decreased the increase of CK by ϳ11%-32% below that of CTRL following an exhaustive run (Ex: p = 0.007; ExGTE: p = 0.001). Moreover, TAS levels increased by ϳ11% 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.Key words: V O 2max , malondialdehyde (MDA), creatine kinase (CK), oxidative stress, catechins.Résumé : Cette étude se propose d'examiner l'effet de la supplémentation en extrait de thé vert (« GTE ») combinée à l'entraînement en endurance sur la capacité d'endurance et la performance chez des hommes sédentaires. Quarante hommes non entraînés (âge de 20 ± 1 ans) participent à cette étude. Les sujets sont assignés à l'un des quatre traitements : (i) placebocontrôle (« CTRL »), (ii) GTE, (iii) entraînement en endurance (Ex) et (iv) entraînement en endurance plus GTE (ExGTE). Durant les quatre semaines de l'intervention, l'entraînement physique consiste en trois séances de 20 min à une intensité sollicitant 75 % du consommation d'oxygène de réserve dans la condition de GTE (250 mg/jour) ou de placebo. On évalue la capacité d'endurance, le taux de malonaldéhyde (« MDA »), le statut antioxydant total (« TAS ») et la créatine kinase (« CK »). Ex et ExGTE, mais pas GTE suscitent une amélioration du temps de course jusqu'à épuisement (Ex: +8,2 %, p = 0,031; ExGTE: +14,3 %, p < 0,001); de plus, Ex et ExGTE suscitent une augmentation significative du consommation maximale d'oxygène de ϳ14 % (p = 0,041) et de ϳ17 % (p = 0,017) respectivement par rapport au groupe CTRL. EX et ExGTE suscitent une baisse significative de l'augmentation de CK de ϳ11-32 % par rap...

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“…This may result from redistribution of the tissue reserves of antioxidants to the oxidative site and/or from the upregulation of endogenous antioxidants as previously reported by Watson et al [33]. Studies carried out by McAnulty et al [34] revealed that the antioxidant potential of plasma generally increases after endurance or resistance exercise even in the absence of oxidative stress evidence Panza et al [35] reported on the protective effects of polyphenols extracted from green tea in weight-trained man as FRAP values were signifi cantly higher in the supplemented groups before and after exercise compared to the placebo group. Results obtained by Panza et al [35] are different from ours as in our study there was no statistically signifi cant FRAP change between groups, nor before and after exercise during the supplementation period (September).…”

Section: Discussionmentioning

confidence: 68%

“…Studies carried out by McAnulty et al [34] revealed that the antioxidant potential of plasma generally increases after endurance or resistance exercise even in the absence of oxidative stress evidence Panza et al [35] reported on the protective effects of polyphenols extracted from green tea in weight-trained man as FRAP values were signifi cantly higher in the supplemented groups before and after exercise compared to the placebo group. Results obtained by Panza et al [35] are different from ours as in our study there was no statistically signifi cant FRAP change between groups, nor before and after exercise during the supplementation period (September). Such differences can be attributed to different experimental designs (humans vs. dogs, time of sampling, type of exercise, supplements used, and so on).…”

Section: Discussionmentioning

confidence: 99%

Effects Of Rose-Hip And Grapeseed Dietary Supplementation On Serum Oxidative Stress Parameters In Dogs Before And After Physical Exercise

Kukovska¹,

Celeska

Ruskovska

et al. 2015

Acta Veterinaria

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The aim of this study was to evaluate the effects of 60 days of rose-hip and grapeseed dietary supplementation of a balanced home-cooked diet on serum oxidative stress parameters: ROMs, MDA and FRAP in army service dogs before and after regular physical exercise. The dogs were fed a balanced cooked diet as instructed by army standards until the initial blood sampling in June. Thereon the dogs were randomly allotted to 4 groups according to the dietary regime: dogs maintained on a balanced cooked diet according to army standards, branded dry dog food, cooked diet with added 500 mg rose-hip extract, and cooked diet with added 100 mg grapeseed extract for a 60 day period from June to September after which all 4 groups were fed the standard cooked meal diet. Sampling was performed at the beginning of the experiment (June), 60 days from the start of the treatment (September) and finally 60 days after the end of supplementation (November). Statistical analysis of the results included descriptive statistical parameters: mean (M), standard deviation (SD), and variation coefficient (CV%). In order to test the statistical significance of the differences between treatments a multifactor variance test (ANOVA) was performed for ROM, MDA and FRAP and the combined effects of diet, exercise and time period were observed. The initial (in June) increase in MDA and ROMs after exercise indicates the presence of oxidative stress 30 minutes after exercise. However, the antioxidative effects of rose-hip and grapeseed extracts are not conclusive, as multifactor ANOVA testing of time, diet, and exercise factors did not reveal for MDA statistically significant differences either at 60 days of supplementation nor 60 days after withdrawal of the supplements. Only one distinct exception was recorded for the prolonged antioxidative effects reflected in significantly decreased (p<0.01) ROMs before and after exercise in dogs fed the branded dry food 60 days after the end of such dietary regime (November). FRAP values tend to be higher (p>0.05) after exercise compared to before exercise in all experimental groups in November, indicating on a possible redistribution and upregulation of endogenous antioxidants during the experiment.

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Consumption of green tea favorably affects oxidative stress markers in weight-trained men

Cited by 121 publications

References 48 publications

Blood serum DSC analysis of well-trained men response to CrossFit training and green tea extract supplementation

Blood serum DSC analysis of well-trained men response to CrossFit training and green tea extract supplementation

Green tea extract supplementation does not hamper endurance-training adaptation but improves antioxidant capacity in sedentary men

Effects Of Rose-Hip And Grapeseed Dietary Supplementation On Serum Oxidative Stress Parameters In Dogs Before And After Physical Exercise

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