Claveau Pascale, Deshayes Thomas A, Jeker David, Pancrate Timothée, Goulet Eric D B
Faculty of Physical Activity Sciences, University of Sherbrooke, Sherbrooke, QC, Canada.
Research Centre on Aging, University of Sherbrooke, Sherbrooke, QC, Canada.
Appl Physiol Nutr Metab. 2021 Aug 30:1-8. doi: 10.1139/apnm-2021-0476.
The terms drinking to thirst and ad libitum drinking are used interchangeably, but should they? We investigated the differences in how athletes consumed fluids during exercise when instructed to drink according to thirst or ad libitum. Using a randomized, crossover, and counterbalanced design, 10 males (27 ± 4 y) cycled 120 km (48 ± 4% of peak power, 33 °C, 40% relative humidity) on 2 occasions, while drinking water according to thirst or ad libitum. Participants covered the cycling trials in 222 ± 11 min ( = 0.29). Although the body mass loss at the end of exercise and total volume of water consumed were similar between trials, thirst perception before each sip and the volume consumed per sip were significantly higher with thirst than ad libitum drinking, whereas the total number of sips was significantly lower with thirst than ad libitum drinking. Perceived exertion, rectal temperature, and heart rate were all significantly higher with thirst than ad libitum drinking, but the difference was trivial. In conclusion, thirst and ad libitum drinking are associated with different drinking patterns, but equally maintain fluid balance during prolonged exercise. The terms drinking to thirst and ad libitum drinking can be used interchangeably to guide fluid intake during prolonged exercise. Both strategies are associated with different patterns of fluid ingestion during prolonged exercise, but are equally effective in maintaining fluid balance. Perceived exertion, rectal temperature, and heart rate are regulated dissimilarly by thirst and ad libitum drinking, but the difference is trivial.
“口渴时饮水”和“随意饮水”这两个术语通常可互换使用，但真的应该如此吗？我们研究了运动员在运动期间按照口渴指示饮水或随意饮水时的液体摄入差异。采用随机、交叉和平衡设计，10名男性（27±4岁）在两种情况下分别骑行120公里（功率峰值的48±4%，33°C，相对湿度40%），同时按照口渴指示或随意饮水。参与者完成骑行试验的时间为222±11分钟（=0.29）。尽管运动结束时的体重减轻和饮水总量在两次试验中相似，但口渴时每次饮水前的口渴感和每次饮水量均显著高于随意饮水，而口渴时的饮水次数显著低于随意饮水。口渴时的主观用力感觉、直肠温度和心率均显著高于随意饮水，但差异很小。总之，口渴时饮水和随意饮水与不同的饮水模式相关，但在长时间运动中同样能维持液体平衡。“口渴时饮水”和“随意饮水”这两个术语可互换使用，以指导长时间运动期间的液体摄入。两种策略在长时间运动期间与不同的液体摄入模式相关，但在维持液体平衡方面同样有效。口渴时饮水和随意饮水对主观用力感觉、直肠温度和心率的调节方式不同，但差异很小。
