Kuo Yu-Chi, Lin Jung-Charng, Bernard Jeffrey R, Liao Yi-Hung
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.
b Graduate Institute of Coaching Science, Chinese Culture University, Taipei, Taiwan.
Appl Physiol Nutr Metab. 2015 Oct;40(10):990-6. doi: 10.1139/apnm-2014-0538. Epub 2015 May 8.
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.
本研究旨在探讨补充绿茶提取物（GTE）结合耐力训练对久坐男性耐力和运动表现的影响。40名未经训练的男性（年龄：20±1岁）参与了本研究。受试者被分配到4种治疗方案中的1种：（i）安慰剂对照（CTRL），（ii）GTE，（iii）耐力训练（Ex），以及（iv）GTE与耐力训练结合（ExGTE）。在为期4周的干预期间，运动训练规定为每周进行3次20分钟的训练，摄氧量储备为75%，同时提供GTE（250毫克/天）或安慰剂。检测了耐力、丙二醛（MDA）、总抗氧化状态（TAS）和肌酸激酶（CK）。Ex和ExGTE组（而非GTE组）的力竭跑步时间有所改善（Ex组：增加8.2%，p = 0.031；ExGTE组：增加14.3%，p < 0.001）；此外，Ex组和ExGTE组的最大摄氧量分别比CTRL组的值显著增加了约14%（p = 0.041）和约17%（p = 0.017）。Ex组和ExGTE组在力竭跑步后CK的增加量均比CTRL组显著降低了约11%-32%（Ex组：p = 0.007；ExGTE组：p = 0.001）。此外，训练后ExGTE组的TAS水平增加了约11%（p = 0.040），GTE组、Ex组和ExGTE组均显著减轻了运动诱导的MDA生成（分别为p = 0.01、p = 0.0见05、p = 0.011）。总之，本研究表明，在耐力训练期间每日摄入GTE不会损害耐力的提高。此外，耐力训练与GTE结合不仅能增加抗氧化能力而不减弱耐力训练适应性，还能进一步减轻急性运动诱导的CK释放。
