Thirst during hot-weather cycling affected concentration ratings, not executive-test scores

In 12 men, water and intravenous saline produced similar hydration, but saline left participants thirstier and more thermally strained; flanker-task and mood scores did not differ.

By Nootropik News Editorial Team News/source date: 10 September 2026 Published: 5 October 2026 · 04:04 (UTC+3) Updated: 5 October 2026 · 04:04 (UTC+3)

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Study design

Twelve men cycled for 90 minutes at 55% of VO2max in 35°C heat, then completed a 12 km cycling time trial. In one crossover condition they drank 25 mL water every five minutes; in the other, they received the same volume of isotonic saline intravenously. Researchers assessed thirst, perceived symptoms, mood and a modified flanker task.

Findings

Body-mass loss and urine specific gravity did not differ between conditions, indicating similar hydration status. Thirst was higher with intravenous saline; participants also rated performance decrements, difficulty concentrating and thermal strain higher. Flanker-task and mood outcomes did not significantly differ.

Limits and disclosures

The crossover experiment included only 12 men and tested a specific exercise-in-heat protocol. It suggests that thirst can affect subjective concentration and thermal discomfort even when measured hydration is similar, but it did not demonstrate an executive-function test effect or establish results for other people or settings.

This sourced news summary and translation were prepared with AI assistance. Source links, the news date and research limitations are disclosed; this is not a claim of independent medical expert review. News production method.

Sources

A randomized trial on thirst satiation during exercise in the heat: Effects on thermal strain, perceived concentration, and executive function — Nutrition and Health / SAGE · 10 September 2026

Research news is not medical advice or a recommendation to use a substance. Read findings in the context of the study design, participants and limitations. Editorial standards.

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