Oral rehydration vs intravenous rehydration💧
Which is best for hot environments.
Oral Rehydration Improved Exercise Performance and Decreased Core Temperature and Heart Rate Compared With Intravenous Rehydration in Recreationally Active Men
Study Details
This new study investigated oral vs IV rehydration after exercise in the heat in active men 🥵
Two experimental trials were performed during exercise in random order…
🥤 drink 25 ml of water every 5 minutes (ORAL)
💉 25 ml of isotonic saline infused intravenously every 5 minutes (IV)
Here is what they found ⬇️
Key Findings
In both trials participants started hydrated and ended dehydrated (~2.3% BW loss) with no differences between conditions for hydration status 📉
Thirst levels were higher in IV vs ORAL…
👉 From 20 to 50 mins
👉 After 65 mins
👉 Throughout 90 mins of cycling exercise 👉 Throughout the following 12-km time trial
Core temperature was also higher in IV vs ORAL…
👉 After 20 mins
👉 Throughout 90 mins of cycling exercise
👉 Throughout the following 12-km time trial
The time trial was significantly faster in ORAL (17.7 ± 4.6 mins) compared with IV (19.6 ± 6.2 mins) ✅
🫀 Heart rate was also lower in ORAL vs IV conditions
Conclusion
Oral rehydration enhances exercise performance in the heat and thermal management compared to IV rehydration🥤✅
This may indicate a significant perceptual benefit of hydrating orally during exercise 🧠
When the heat is on drink. Don’t drip.
Reference
https://pubmed.ncbi.nlm.nih.gov/41958221/
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