Abstract
- Background
Fluids and electrolytes—principally sodium—are recommended to athletes across all stages of exercise to sustain total body water and cellular homeostasis. Fluid deficits (hypohydration) significantly elevate cardiovascular and thermal strain while degrading aerobic exercise performance. Vigorous exertion combined with warm or hot environmental exposure induces substantial sweat production, causing significant simultaneous water and electrolyte losses.
- Methods
This review synthesizes the physiological rationale, metabolic losses, and clinical hydration strategies for fluid and electrolyte management before, during, and after athletic training or competition. The review focuses on daily turnover rates, sweat composition, and protocols for optimizing total body water (euhydration) restoration across different recovery timeframes.
- Results
Active athletes training in hot weather can experience substantial daily losses of water (4--L) and sodium (3500-7000 mg), generating acute fluid and electrolyte deficits. Complete re-establishment of euhydration requires replacing both water and sodium. While standard dietary intake and regular fluid consumption are sufficient for rehydration when recovery time is unconstrained, rapid recovery timelines (<24 hours) or severe hypohydration states (>5% total body mass loss) necessitate aggressive, targeted fluid and electrolyte intake protocols to ensure full physical restoration before subsequent competition.
- Conclusions
Replacing fluid and sodium deficits is essential for preserving performance and mitigating heat-related strain in athletes. Rehydration strategies should be tailored based on the magnitude of fluid loss and the urgency of recovery.
https://pubmed.ncbi.nlm.nih.gov/22150427/