The effect of green tea extract supplementation on exercise-induced oxidative stress parameters in male sprinters

Abstract

BackgroundAlthough 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. PurposeThe 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.MethodsSixteen 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.ResultsRepeated 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.ConclusionsSupplementation 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.

An Update on the Health Benefits of Green Tea

“…The results from recent studies have shown that green tea catechins can affect levels of ROS [79][80][81][82], increase levels of antioxidants [83][84][85][86], decrease levels of inflammatory substances [87,88], and increase TAC (TAS) [84,86,87]. An excellent summary of earlier studies that measured ROS and TAC can be found in a chapter by Serafini et al 2011 [67].…”

Implication of Oxidative Stress in Small Intestine Disorders, Constipation and Diarrhea: A Mini Review

“…SOD plays a crucial action in dismutation of superoxide radicals to H 2 O and oxygen. On the other hand, CAT protects the cells from toxic effects of ROS by transforming H 2 O 2 to H 2 O and O 2 [17]. In this respect, numerous studies have reported that castor oil-induced diarrhea causes depletion of antioxidant activities of SOD, CAT, and GPx, which explains the overproduction of ROS [18].…”

The effect of Opuntia ficus‐indica juice supplementation on oxidative stress, cardiovascular parameters, and biochemical markers following yo‐yo Intermittent recovery test

“…Hammouda, Chaouachi, Ferchichi, Kallel, & Souissi ()) proved a significant increase in blood lactate and an increase in biochemical markers of muscle damage (i.e., creatine kinase (CK) and LDH) and lipid profile during YYIRT. Although, research suggests that antioxidant supplementation has a potent role in postexercise recovery in athletes (Jówko et al., ). Hence, elite athletes are more vulnerable, than a sedentary person, to physical performance altered and physiological responses due to stress caused by free radical production (Hammouda et al., ; Prahalathan, Saravanakumar, & Raja, ).…”