Hypohydration during exercise in children: effect on thirst, drink preferences, and rehydration

Area of Science:

• Pediatric Exercise Science
• Sports Nutrition
• Hydration Physiology

Background:

• Understanding fluid balance in young athletes is crucial for performance and health.
• Exercise in heat can lead to dehydration, impacting thirst and drink choices.
• Limited research exists on children's spontaneous rehydration and drink preferences during recovery.

Purpose of the Study:

• To investigate changes in thirst and drink preferences in children during exercise-induced hypohydration.
• To examine spontaneous rehydration patterns and fluid intake in children post-exercise.
• To compare the effectiveness of different flavored drinks (grape, orange, apple, water) on rehydration.

Main Methods:

• Twenty-four children (9-13 years) underwent intermittent cycling in heat (35°C, 20% RH).
• Children were exposed to four drink conditions: apple, orange, water, and grape.
• Thirst, drink preferences, and body weight changes were monitored during dehydration and recovery.

Main Results:

• Thirst intensity increased across all drink types during dehydration.
• Grape was the most preferred drink, but orange and apple desirability increased significantly.
• Spontaneous fluid intake during recovery led to rehydration exceeding baseline levels, with grape and orange showing greater rehydration magnitude.

Conclusions:

• Mild hypohydration during exercise enhances children's thirst and drink desirability.
• Children exhibit spontaneous fluid intake ('overshoot') during recovery post-exercise.
• Flavored drinks, particularly grape and orange, may promote greater rehydration in children compared to water.