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Updated: Oct 7, 2025

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Fluid Restriction Negatively Influences Perceived Morning Alertness and Visuomotor Ability.

Courteney L Benjamin1, Elliot P Norton1, Benjamin M Shirley1

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Summary
This summary is machine-generated.

Maintaining adequate fluid intake significantly enhances alertness and reaction time in healthy young males. Fluid restriction negatively impacts cognitive performance and perceived alertness, highlighting the importance of hydration.

Keywords:
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Area of Science:

  • Sports Medicine
  • Human Physiology
  • Cognitive Performance

Background:

  • Hydration status is crucial for optimal physiological and cognitive functioning.
  • Fluid intake protocols can influence alertness and reaction time.
  • Understanding these effects is important for maintaining performance in various settings.

Purpose of the Study:

  • To evaluate the impact of two distinct fluid intake protocols on alertness and reaction time.
  • To compare the effects of prescribed fluid (PF) versus fluid restriction (FR) on cognitive performance.
  • To assess changes in reaction time and alertness before and after water ingestion.

Main Methods:

  • 12 healthy college-age males participated in a crossover study with two conditions: prescribed fluid (PF) and fluid restriction (FR).
  • Hydration status was assessed using urine specific gravity and urine color.
  • Participants completed visuomotor reaction time tests (central and peripheral) and rated their alertness and thirst.

Main Results:

  • Prescribed fluid intake led to significantly improved peripheral visuomotor reaction time (PVRT) compared to fluid restriction.
  • Both central and peripheral visuomotor reaction time improved after fluid ingestion.
  • Participants in the prescribed fluid state reported significantly higher alertness levels than those in the fluid-restricted state.

Conclusions:

  • Fluid restriction negatively impacts perceived alertness and peripheral visuomotor reaction time.
  • Adequate hydration, as achieved through the prescribed fluid protocol, is essential for maintaining cognitive performance and alertness.
  • These findings underscore the importance of consistent fluid intake for cognitive function in young adults.