Human Movement Science Research Center, University of Costa Rica, Montes de Oca, San José 11-501-2060, Costa Rica.
Department of Nutrition, Hispanoamerican University, El Carmen, San José 10101, Costa Rica.
Nutrients. 2021 Dec 3;13(12):4357. doi: 10.3390/nu13124357.
Thirst has been used as an indicator of dehydration; however, as a perception, we hypothesized that it could be affected by received information related to fluid losses. The purpose of this study was to identify whether awareness of water loss can impact thirst perception during exercise in the heat.
Eleven males participated in two sessions in random order, receiving true or false information about their fluid losses every 30 min. Thirst perception (TP), actual dehydration, stomach fullness, and heat perception were measured every 30 min during intermittent exercise until dehydrated by ~4% body mass (BM). Post exercise, they ingested water ad libitum for 30 min.
Pre-exercise BM, TP, and hydration status were not different between sessions ( > 0.05). As dehydration progressed during exercise, TP increased significantly ( = 0.001), but it was the same for both sessions ( = 0.447). Post-exercise water ingestion was almost identical ( = 0.949) in the two sessions.
In this study, thirst was a good indicator of fluid needs during exercise in the heat when no fluid was ingested, regardless of receiving true or false water loss information.
口渴常被用作脱水的指标；然而，作为一种感知，我们假设它可能会受到与液体流失相关的信息的影响。本研究的目的是确定在热环境下运动时，对水分流失的认知是否会影响口渴感知。
11 名男性以随机顺序参加了两次实验，每 30 分钟接受一次关于他们液体流失的真实或虚假信息。在间歇性运动期间，每隔 30 分钟测量口渴感知（TP）、实际脱水程度、饱腹感和热感，直到体重减轻约 4%（BM）。运动后，他们可以自由饮水 30 分钟。
两次实验前的 BM、TP 和水合状态无差异（>0.05）。随着运动过程中的脱水进展，TP 显著增加（=0.001），但两个实验session 之间相同（=0.447）。两次实验后，运动后水的摄入几乎相同（=0.949）。
在这项研究中，当没有摄入液体时，口渴是热环境下运动时液体需求的良好指标，无论是否接受真实或虚假的水分流失信息。
