咖啡因漱口對龍舟選手專項運動表現的效果

Effect of Caffeine Mouth Rinse on Performance of Dragon Boat Athletes

目的：本研究旨在探討咖啡因漱口對龍舟選手前後兩次200公尺衝刺測驗的效果。方法：12名優秀龍舟選手，以單盲設計且重複次序隨機分配至咖啡因(CAF)、安慰劑(PLA)、控制組(CON)三種不同處理。研究對象於熱身後分別進行CAF、PLA、CON處理，CAF組以25 ml濃度2%的液態咖啡漱口，每次漱口10秒，每次間隔50秒，於運動測驗前漱口7次後，隨即在龍舟划船機上進行200公尺最大衝刺運動測驗，並於過程中記錄心跳率與運動自覺量表，結束後30分鐘再進行200公尺最大衝刺運動測驗。結果：以重複量數二因子變異數分析3組不同時間點的心跳率、RPE與最大衝刺測驗的運動表現，發現CAF、CON、PLA安靜心跳率分別為59.8±8.1、60.7±7.75、58.9±9.8 bpm；休息15分鐘平均心跳率分別為104.3±14.0、104.7±14.0、104.0±17.7 bpm；第一次運動心跳率分別為141.8±26.5、136.4±29.1、147.2±27.51 bpm；第二次運動心跳率分別為157.9±20.9、157.2±17.9、154.5±28.3 bpm，各時間點心跳率均未達顯著差異(p > .05)。第二次運動測驗後CAF的RPE顯著高於CON (18.0±1.7; 16.9±1.4，p < .05)其餘皆未達顯著水準。第一次與第二次200公尺最大衝刺測驗的時間、頻率、平均功率、分段平均功率皆未達顯著水準(p > .05)。結論：咖啡因漱口對心跳率不會產生改變，也無法提升龍舟選手的200公尺最大衝刺運動表現，咖啡因漱口反而增加第二次衝刺測驗的運動疲勞程度。

Purpose: This study was to investigate the difference in the amount of variation of caffeine mouth rinse on the two bout 200m sprint tests of dragon boat athletes. Methods: Twelve dragon boat athletes were assigned to three different experimental treatments in a single-blind design with random order of repetition. After the standardized warm-up, the subjects were given caffeine treatment (CAF), placebo treatment (PLA) and control (CON). The CAF was performed by mouth rinse 25 ml of liquid coffee at 2% concentration for 10 seconds each time with an interval of 50 seconds, and mouth rinse 7 times before the exercise test. The heart rate and rating of perceived exertion (RPE) were recorded before and after test. A second test was conducted 30 minutes after the first test, and the same indicators were collected as before the first test. Results: After repeated measures of univariate variance in order of CAF, CON, PLA, resting mean heart rate was 59.8±8.1, 60.7±7.75, 58.9±9.8 bpm, and resting 15-minute mean heart rate was 104.3±14.0 vs. 104.7±14.0, 104.0±17.7 bpm. First bout mean heart rate was 141.8±26.5 vs. 136.4±29.1, 147.2±27.51 bpm, the second bout mean heart rate was 157.9±20.9, 157.2±17.9, 154.5±28.3 bpm, did not reach significant differences. Completion time, frequency, average power, and segmental average power did not reach significant difference in the first and second 200 m sprint tests (p > .05). The RPE of CAF after the second bout significant higher than CON (18.0±1.7 vs. 16.9±1.4, p < .05). Conclusion: Caffeine mouth rinse did not improve dragon boat athletes' 200 m sprint performance, and caffeine mouth rinse increased exercise RPE in the second test.