中場進行醣類漱口對後續反覆衝刺運動表現之影響

Abstract

目的：探討中場進行醣類漱口 (carbohydrate mouth rinse, CMR) 與CMR + 攝入(carbohydrate mouth rinse + ingestion, CMRI) 的方式，對後續反覆衝刺運動表現之影響。方法：以12名高中以上甲組女子籃球選手為受試對象。受試者需先進行控制處理 (CON)，接著以隨機交叉平衡次序方式，分別進行其餘三種實驗處理，包括CMRI (含有6.4%葡萄糖、漱口後攝入)、CMR (含有6.4%葡萄糖、漱口後吐出) 與安慰劑處理，各處理間需間隔72小時。進入中場休息15分鐘時，分別給予四種不同的實驗處理，在每7.5分鐘給予25 mL溶液，於口中漱10秒，總共2次，接著進行20趟15公尺的反覆衝刺測驗 (repeated sprint ability test, RSA)。實驗中全程監測心跳率，並於股外側肌配戴近紅外線光譜儀，且依各時間點採取血乳酸、血糖與詢問運動自覺強度。結果：在RSA單趟衝刺速度上，CMRI的第13趟衝刺速度顯著高於CON與PLA (F = 3.370, p = .030)，CMRI與CMR與CON的第16趟衝刺速度，皆顯著高於PLA (F = 4.597, p = .009)，而PLA的第20趟衝刺速度則顯著低於CON (F = 3.198, p = .036)。有關血紅素差值的變化量，在Sprint11-20時，CMRI (p = .030, d = 0.78) 與CMR (p = .009, d = 0.89) 顯著低於CON，且CMRI顯著低於PLA (p =.043, d = 0.79)。另外，血糖、血乳酸與運動自覺強度皆無顯著差異。結論：在中場休息期間，利用CMRI的方式，可能有助於提升女子籃球選手下半場反覆衝刺的速度。此增補效益可能來自CMR與CMRI改善了肌肉中氧氣利用率。Purpose: To investigate the effects of half-time (HT) carbohydrate mouth rinse (CMR) and carbohydrate mouth rinse + ingestion (CMRI) on subsequent repeated sprint ability (RSA) performance. Methods: Twelve female basketball players completed a control trial (CON) and 3 treatments in a randomized crossover design: CMRI (6.4% glucose, mouth rinse followed by ingestion), CMR (6.4% glucose, mouth rinse) and placebo. During HT, 25 mL of solution was administered twice every 7.5 minutes, including a 10-second mouth rinse. RSA performance was assessed with 20 repetitions of a 15m sprint after HT. Heart rate, near-infrared spectroscopy, blood lactate, glucose, and RPE were monitored throughout the trial. Results: For each sprint speed, CMRI was significantly higher than CON and PLA in the 13th sprint (F = 3.370, p = .030). CMRI, CMR, and CON were significantly higher than PLA in the 16th sprint (F = 4.597, p = .009). PLA was significantly lower than CON in the 20th sprint (F = 3.198, p = .036). Regarding the changes in difference between oxy/deoxygenated hemoglobin, the CMRI (p = .030, d = 0.78) and CMR (p = .009, d = 0.89) at Sprint11-20 were significantly lower than CON, whereas CMRI was significantly lower than PLA (p = .043, d = 0.79). There were no significant differences in blood lactate, blood glucose, and RPE among treatments. Conclusion: During HT, CMRI might enhance the repeated sprint performance in female basketball players. This ergogenic effect is likely due to the improvements in the rate of oxygen utilization in the muscles facilitated by CMR and CMRI.