Gam Sharon, Guelfi Kym J, Fournier Paul A
School of Sport Science, Exercise and Health, University of Western Australia, Australia.
Int J Sport Nutr Exerc Metab. 2013 Feb;23(1):48-56. doi: 10.1123/ijsnem.23.1.48. Epub 2012 Sep 4.
Studies have reported that rinsing the mouth with a carbohydrate (CHO) solution improves cycling time-trial performance compared with rinsing with a placebo solution. However, no studies have compared the effect of mouth rinsing with a no-mouth-rinse control condition. The aim of this study was to compare the effects of a CHO mouth rinse with those of a placebo rinse and a no-rinse condition. Ten male cyclists completed three 1,000-kJ cycling time trials in a randomized, counterbalanced order. At every 12.5% of the time trial completed, participants were required to rinse their mouths for 5 s with either a 6.4% maltodextrin solution (CHO), water (WA), or no solution (CON). Heart rate and ratings of perceived exertion (RPE) were recorded every 25% of the time trial completed. Time to completion was faster in both CHO (65.7 ± 11.07 min) and CON (67.6 ± 12.68 min) than in WA (69.4 ± 13.81 min; p = .013 and p = .042, respectively). The difference between CHO and CON approached significance (p = .086). There were no differences in heart rate or RPE between any conditions. In summary, repeated mouth rinsing with water results in decreased performance relative to not rinsing at all. Adding CHO to the rinse solution appears to oppose this fall in performance, possibly providing additional benefits to performance compared with not rinsing the mouth at all. This brings into question the magnitude of the effect of CHO mouth rinsing reported in previous studies that did not include a no-rinse condition.
研究报告称，与用安慰剂溶液漱口相比，用碳水化合物（CHO）溶液漱口可提高自行车计时赛成绩。然而，尚无研究将漱口与不漱口的对照条件的效果进行比较。本研究的目的是比较CHO漱口、安慰剂漱口和不漱口条件的效果。10名男性自行车运动员以随机、平衡的顺序完成了三次1000千焦的自行车计时赛。在每次完成计时赛的12.5%时，要求参与者用6.4%的麦芽糊精溶液（CHO）、水（WA）或不用溶液（CON）漱口5秒。在每次完成计时赛的25%时记录心率和主观用力程度（RPE）。CHO组（65.7±11.07分钟）和CON组（67.6±12.68分钟）完成比赛的时间均比WA组（69.4±13.81分钟）快（p值分别为0.013和0.042）。CHO组和CON组之间的差异接近显著水平（p = 0.086）。各条件之间的心率或RPE没有差异。总之，与完全不漱口相比，反复用水漱口会导致成绩下降。在漱口溶液中添加CHO似乎可以抵消这种成绩下降，与完全不漱口相比，可能对成绩有额外的益处。这使得之前未包括不漱口条件的研究中所报告的CHO漱口效果的大小受到质疑。
