Pre-exercise sodium hyperhydration enhances hydration status during exercise in the heat 🌡️
Improve your hydration in the heat.
Hydration Responses to Pre-Exercise Sodium Hyperhydration at Rest and During Cycling in the Heat and Across Menstrual Cycle Phases
Study Details
This new study recruited 12 female cyclists / triathletes to a crossover trial where they ingested either 30 ml/kg fat-free mass fluid with either…
🧂 Sodium chloride (7.5 g/L)
🥤 Placebo (sucrose)
…2 hr before 75 min of steady-state cycling (60% VO2peak) and a 200 kJ time trial (TT) 🚴♀️
The trial was completed in a hot environment (34°C / 60% RH) 🌡️
Key Findings
During the pre-exercise period sodium hyperhydration…
💧 Increased fluid retention (509 ml)
🚽 Reduced urine volume (-107.4 ml)
During exercise, sodium hyperhydration…
⚖️ Lowered body mass loss during steady state (-0.20%) and TT (-0.15%)
🥵 Reduced sweat rates during steady state only (-0.08 L/hr)
Further analysis across menstrual cycle phases also showed greater effects in the early-follicular (EF) vs mid-luteal (ML) phases for reductions in…
📉 Body mass loss (-0.26%)
💦 Sweat rate (-0.1 L/hr)
🔬 Post-TT arginine vasopressin (-10.8 pg/ml)
Conclusion
Sodium hyperhydration effectively enhanced fluid retention and reduced body mass loss during exercise in the heat ✅
However, practitioners should pay attention to menstrual cycle phases to inform hydration practices and expected outcomes 🔍
Reference
https://pubmed.ncbi.nlm.nih.gov/41373963/
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