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

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Title:	Green tea extract supplementation does not hamper endurance-training adaptation but improves antioxidant capacity in sedentary men
Authors:	Kuo, Yu-Chi Lin, Jung-Charng Bernard, Jeffrey R. Liao, Yi-Hung
Contributors:	Grad Inst Coaching Sci
Keywords:	(V)over dotO(2max) malondialdehyde (MDA) creatine kinase (CK) oxidative stress catechins
Date:	2015-10
Issue Date:	2015-10-23 10:18:45 (UTC+8)
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 similar to 14% (p = 0.041) and similar to 17% (p = 0.017) above the values of the CTRL group, respectively. Both Ex and ExGTE significantly decreased the increase of CK by similar to 11%-32% below that of CTRL following an exhaustive run (Ex: p = 0.007; ExGTE: p = 0.001). Moreover, TAS levels increased by similar to 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.
Relation:	APPLIED PHYSIOLOGY NUTRITION AND METABOLISM 卷: 40 期: 10 頁碼: 990-996
Appears in Collections:	[Graduate Institute of Sport Coaching Science ] journal articles

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