James Ruth M, Ritchie Sarah, Rollo Ian, James Lewis J
Int J Sport Nutr Exerc Metab. 2017 Feb;27(1):25-31. doi: 10.1123/ijsnem.2016-0111. Epub 2016 Sep 6.
The aim of the current study was to investigate the influence of mouth rinsing carbohydrate at increasing concentrations on ~1 hr cycle time trial performance. Eleven male cyclists completed three experimental trials, following an overnight fast. Cyclists performed a ~1 hr time trial on a cycle ergometer, while rinsing their mouth for 5 s with either a 7% maltodextrin solution (CHO), 14% CHO or a taste-matched placebo (PLA) after every 12.5% of the set amount of work. Heart rate was recorded every 12.5% of the time trial, while RPE and GI comfort were determined every 25% of the time trial. The mouth rinse protocol influenced the time to complete the time trial (p < .001), with cyclists completing the time trial faster during 7% CHO (57.3 ± 4.5 min; p = .004) and 14% CHO (57.4 ± 4.1 min; p = .007), compared with PLA (59.5 ± 4.9 min). There was no difference between the two carbohydrate trials (p = .737). There was a main effect of time (P<0.001) for both heart rate and RPE, but no main effect of trial (p = .107 and p = .849, respectively). Scores for GI comfort ranged from 0-2 during trials, indicating very little GI discomfort during exercise. In conclusion, mouth rinsing and expectorating a 7% maltodextrin solution, for 5 s routinely during exercise was associated with improved cycle time trial performance approximately 1 h in duration. Increasing the carbohydrate concentration of the rinsed solution from 7% to 14% resulted in no further performance improvement.
本研究的目的是调查在约1小时的周期时间试验中，递增浓度的碳水化合物漱口对运动表现的影响。11名男性自行车运动员在禁食过夜后完成了三项实验性试验。自行车运动员在自行车测力计上进行约1小时的计时赛，在完成设定工作量的每12.5%后，用7%的麦芽糊精溶液（CHO）、14%的CHO或口味匹配的安慰剂（PLA）漱口5秒。在计时赛的每12.5%记录心率，在计时赛的每25%确定主观用力程度（RPE）和胃肠道舒适度（GI）。漱口方案影响了完成计时赛的时间（p < .001），与PLA组（59.5 ± 4.9分钟）相比，自行车运动员在7% CHO组（57.3 ± 4.5分钟；p = .004）和14% CHO组（57.4 ± 4.1分钟；p = .007）完成计时赛的速度更快。两种碳水化合物试验之间没有差异（p = .737）。心率和RPE均存在时间主效应（P<0.001），但试验无主效应（分别为p = .107和p = .849）。试验期间胃肠道舒适度评分在0-2分之间，表明运动期间胃肠道不适很小。总之，在运动期间常规漱口并吐出7%的麦芽糊精溶液5秒，与约1小时的周期时间试验表现改善有关。将漱口溶液的碳水化合物浓度从7%提高到14%并没有进一步提高运动表现。
