Hydration Strategies for Swimmers

Definition of Hydration Strategies

Hydration strategies refer to individualized approaches that manage:

• Pre–exercise hydration status
• Fluid intake during training
• Electrolyte replacement

These strategies aim to maintain fluid balance, support thermoregulation, and preserve performance capacity.

Performance Relevance

Hydration affects:

• Cardiovascular stability
• Thermoregulation
• Cognitive function
• Perceived exertion
• Training quality

Swimmers often underestimate sweat loss due to the aquatic environment, making structured hydration strategies essential.

Core Principle

Effective hydration for swimmers requires personalized protocols based on pre–exercise hydration status, sweat rate, and electrolyte needs.
Sports drinks generally outperform water for maintaining hydration markers, but many swimmers begin training hypohydrated, highlighting a major implementation gap.

Key Evidence

Component 1: Sports Drinks Maintain Hydration Better Than Water

Prado et al.; Henkin et al.

2005–2009

Sports Drinks Maintain Hydration Better Than Water

Prado et al. (2009), studying 8 swimmers, found that:

• Sports drinks provided better hydration status classification
• Compared to water or no fluid intake

Henkin et al. (2005), also with 8 swimmers, showed that:

• Smaller volumes of sports drink maintained euhydration
• More effectively than pure water

This suggests electrolyte–containing fluids support hydration more efficiently.

Component 2: Many Swimmers Begin Training Hypohydrated

Jansen et al.; Adams et al.; Altavilla et al.

2015–2017

Many Swimmers Begin Training Hypohydrated

Jansen et al. (2015) and Adams et al. (2016) found that:

• 67–78% of adolescent swimmers (n=46)
• Began training hypohydrated
• Despite free access to fluids

Altavilla et al. (2017), studying 86 swimmers, reported:

• Poor hydration knowledge
• Limited understanding of fluid needs

This highlights a major educational gap in youth swimming populations.

Component 3: Personalized Hydration Strategies Are Recommended

Maughan & Shirreffs

2008–2010

Personalized Hydration Strategies Are Recommended

Maughan & Shirreffs (2008, 2010) recommend:

• Assessing pre–exercise hydration using urine markers
• Developing individualized hydration plans
• Accounting for sweat rate, training load, and environmental conditions

These guidelines form the foundation of modern hydration planning.

Component 4: Evidence Base Is Modest but Consistent

Multiple Authors

Various

Evidence Base Is Modest but Consistent

Most studies use small sample sizes, but findings consistently support:

• Individualized hydration
• Electrolyte replacement
• Pre–exercise hydration assessment
• Sports drink advantages over water

Chen et al. (2025) emphasize the need for standardized protocols to improve research quality.

Component 5: Integrated Interpretation of Evidence

Multiple Authors

Various

Integrated Interpretation of Evidence

Hydration strategies for swimmers must be individualized, incorporating pre–exercise hydration assessment, fluid intake during training, and electrolyte replacement.
Sports drinks generally maintain hydration markers better than water, yet many swimmers begin training hypohydrated, underscoring the need for education and personalized planning.

Conclusion

Hydration strategies for swimmers must be individualized, incorporating pre–exercise hydration assessment, fluid intake during training, and electrolyte replacement.
Sports drinks generally maintain hydration markers better than water, yet many swimmers begin training hypohydrated, underscoring the need for education and personalized planning.

Citation

• Adams, J., et al. (2016). Fluid Balance of Adolescent Swimmers During Training.
• Altavilla, C., et al. (2017). Hydration and nutrition knowledge in adolescent swimmers.
• Domínguez, R., et al. (2017). Nutritional needs in the professional practice of swimming.
• Henkin, S. D., et al. (2005). Body Fluid Balance Of Competitive Male Swimmers.
• Jansen, L. T., et al. (2015). Fluid Balance of Adolescent Swimmers During Training.
• Maughan, R., & Shirreffs, S. (2008, 2010). Development of individual hydration strategies.
• Prado, E., et al. (2009). Hydration state in swimmers after different hydric replacement forms.
• Qian, D., & Cui, Q. (2025). Optimizing endurance performance in elite swimmers.