The effects of acute oral GTE supplementation on exercise performance and energy metabolism during subsequent recovery periods in humans

• Main Authors: Chang, Chia-Chen, 張嘉珍
• Other Authors: Cheng, I-Shiung
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/v39swn

博士 === 國立臺灣師範大學 === 體育學系 === 106 === The purpose of the study was to investigate whether single-dose administration of green tea extracts (GTE) would enhance subsequent exercise performance, and the effect of second GTE supplementation immediately after exercise on substrate oxidation during exercise recovery periods. Eleven recruited healthy male performed a cycling exercise at 60％Wmax until exhaustion follow either 1500 mg GTE or placebo capsule with a 300 kcal breakfast meal, then second GTE /placebo administration immediately after exhausting exercise under a single- blinded cross-over design. Heart rate data, blood and gaseous exchange samples were collected during experimental period. Student’s paired t-test was performed to compare the differences of the exercise time to exhaustion at 60％Wmax and total energy expenditure. Other variables were assessed using repeated measures (trial × time) analysis of variance with Bonferroni post hoc test. The main results in this study showed (1) acute GTE supplementation enhanced exhausting time in ergometer cycling test (p < .05); (2) second GTE administration immediately after exhausting exercise will affect energy metabolism reliance on fat oxidation, based on gaseous exchange sample and serum non-esterified fatty acid concentration. In addition, serum ammonia level was significantly higher immediately after exercise in GTE trial (p < .05). However, GTE significantly lowered serum ammonia concentration at 180 min during recovery period. Blood glucose, serum urea and creatine kinase, and total energy expenditure were unchanged between GTE/placebo trials. Therefore, we suggest that (1) GTE enhances exhausting exercise performance; (2) post-exercise GTE administration increases energy reliance on fat oxidation.