綠茶萃取物補充對運動表現與後續恢復期能量代謝的影響

本研究探討運動前單次補充去咖啡因綠茶萃取物 (green tea extracts, GTE) 是否能提升力竭性運動表現，以及於運動結束後立即再次補充GTE對後續恢復期間身體能量代謝的影響。本實驗採用單盲交叉設計，招募11位健康男性受試者重複進行綠茶試驗 (GTE) 與安慰組試驗 (Placebo)，兩次試驗至少間隔7天以上。受試者在試驗當天早上食用1份300大卡的輕食，隨後，立即補充1500 mg GTE或安慰劑膠囊，安靜休息2小時後，在原地腳踏車上進行單次固定強度 ( 60％最大功率) 至力竭的運動，運動後隨即再補充1500 mg 相同成份的膠囊。運動期間全程監控心率變化；補充前、運動前、後採集手臂靜脈血液，以及運動結束後3小時期間，每60分鐘採血；運動後3小時期間，每60分鐘收集氣體變化。除了運動至力竭的時間與總能量消耗以配對 t 檢定外，所有參數皆以重複量數二因子 (試驗×時間) 變異數進行分析，若交互作用達顯著差異，以 Bonferroni 法進行事後比較。本研究結果 (1) 運動前單次GTE補充明顯提升運動至力竭的時間 (p < .05)；(2) 血清非酯化脂肪酸濃度和氣體呼吸交換率數據顯示，力竭運動後立即補充GTE，恢復期間身體能量傾向脂肪氧化作用。另外，GTE 的血氨在運動結束時顯著高於 Placebo，而運動恢復期間第180分鐘明顯低於 Placebo (p < .05)。GTE 和 Placebo 的血糖、血清尿素與血清肌酸激酶、總能量消耗皆未達顯著差異。本研究結論 (1) 運動前補充 GTE 可以提升力竭運動表現；(2) 運動後立即再次補充 GTE 使身體能量代謝傾向於脂肪氧化作用。

關鍵字

力竭性運動；疲勞；能量消耗；脂肪氧化作用

並列摘要

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.

並列關鍵字

exhaustive exercise ； fatigue ； energy expenditure ； fat oxidation

參考文獻

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綠茶萃取物補充對運動表現與後續恢復期能量代謝的影響

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