Voluntary drinking behaviour, fluid balance and psychological affect when ingesting water or a...

Area of Science:

• Exercise Physiology
• Sports Nutrition
• Hydration Science

Background:

• Adequate hydration and fluid intake are crucial for maintaining performance and well-being during exercise.
• The composition of beverages can influence voluntary consumption and physiological responses during physical activity.
• Understanding the impact of different fluid options is essential for athletes and physically active individuals.

Purpose of the Study:

• To investigate the effects of drink composition on voluntary intake, hydration status, physiological responses, and affective states during simulated gymnasium exercise.
• To compare the efficacy of a carbohydrate-electrolyte solution (CES) against water (W) and no fluids (NF) in a controlled exercise setting.

Main Methods:

• A randomized, counterbalanced design involving 12 physically active adults.
• Participants performed simulated gymnasium exercise including cardiovascular and resistance training intervals.
• Ad libitum access to water (W), carbohydrate-electrolyte solution (CES), or no fluids (NF) was provided during exercise and recovery.

Main Results:

• Fluid intake was significantly greater with CES compared to W (P<0.01).
• More adequate hydration was achieved with CES compared to W and NF (P<0.01).
• Plasma glucose concentrations were highest with CES, and pleasure ratings were better maintained compared to W and NF (P<0.01).

Conclusions:

• Carbohydrate-electrolyte solutions promote more adequate hydration during gymnasium exercise compared to water or no fluid intake.
• CES intake positively influences affective states, maintaining better mood and pleasure during exercise.
• These findings highlight the benefits of CES for optimizing hydration and psychological well-being during moderate-intensity exercise protocols.