Effect of Eight-week Green Tea Extracts Supplementation on Glycogen Synthesis in Exercised Human Skeletal Muscle

• Main Authors: CHEN,HAO-WEN, 陳顥文
• Other Authors: CHENG,YI-SHIUNG
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/24972888410367658461

碩士 === 國立臺中教育大學 === 體育學系碩士班 === 102 === Previous studies showed that green tea extracts (GTE) are able to reduce body fat mass in mice and humans. The mechanism behind this phenomenon and GTE impact on metabolic consequences in human skeletal muscle remains unclear. Therefore, the present study investigated whether GTE supplementation enhanced fatty acid oxidation and attenuated glucose utilization resulting in enough glycogen reserves in exercised human skeletal muscle. Eight male athletes (age 21.9 ± 0.77 years) participated in this study, and served as eight weeks GTE supplementation (500 mg GTE/day for 8-week). Before and after GTE supplementation, subjects were separately performed a single bout of 60-min cycling exercise at 70-75 % (VO2 max) and consumed a carbohydrate meal (2 g carbohydrate/kg body weight, 80 % carbohydrate, 8 % fat, 12 % protein) immediately after exercise. Biopsied muscle samples were obtained from vastus lateralis immediately and 3 h after exercise. Simultaneously, blood were collected every 30-min and gaseous samples were collected every 60-min during 3-h recovery. The results in this study were shown that the rate of muscle glycogen synthesis with GTE administration was significant higher after eight weeks oral GTE supplementation (p<.05). On the other hand, GTE had advantages for enhancing fat oxidation, based on the evidences from gaseous exchanges method and higher responses in circulating non-esterify fatty acid (NEFA) after 8 weeks GTE supplementation (p<0.05). The present study suggested that eight weeks oral GTE supplementation can be used as ergogenic aids, evidences from our results showed the beneficial effect of GTE on glycogen synthesis in exercised human skeletal muscle.