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Area of Science:

  • Exercise Physiology
  • Sports Nutrition
  • Cognitive Neuroscience

Background:

  • Dehydration negatively impacts physical performance and cognitive abilities.
  • The specific effects of pre-exercise hydration status on thermoregulation and cognition during prolonged exercise remain unclear.

Purpose of the Study:

  • To investigate how hydration status before exercise influences thermoregulation and cognitive function during continuous cycling.
  • To determine if inadequate hydration compromises executive function and visuospatial working memory.

Main Methods:

  • Thirty physically active men were randomized into well-hydrated (HYD) or insufficiently hydrated (HYP) groups based on urine specific gravity (USG).
  • Participants cycled at 50% maximal power output until 3% body-mass loss or 120 min, with core temperature and sweat rate monitored.
  • Executive function (Stroop Interference) and visuospatial working memory (Corsi Block-Tapping) were assessed pre- and post-exercise.

Main Results:

  • The well-hydrated group exhibited a significantly higher sweat rate and were more likely to reach 3% body-mass loss.
  • Despite differences in sweat rate, early core temperature did not differ between groups.
  • Inadequate hydration selectively impaired executive control, specifically slowing Stroop naming interference, while visuospatial working memory remained unaffected.

Conclusions:

  • Euhydration before prolonged exercise is recommended, as indicated by a morning urine specific gravity below 1.018.
  • Inadequate baseline hydration can impair inhibitory control during exercise, even when thermoregulatory responses appear similar.
  • Pre-exercise hydration strategies, including fluid intake and USG monitoring, may be necessary to preserve executive function for tasks requiring rapid decision-making and attention.