Electrolytes and Immunity

Hydration at Altitude and in Extreme Climates: What Every Athlete Needs to Know

Whether you're training at high altitude, competing in the heat, or just pushing your limits outdoors, your hydration needs change drastically with the environment. Both recreational and elite athletes need to adapt their strategies to stay ahead of fatigue, dehydration, and impaired performance.

Increased fluid loss, shifting sweat rates, and the impact of lower oxygen availability all mean that simply drinking water won’t cut it. Hydration must be intentional, strategic, and tailored to your training conditions, especially when elevation and heat are involved.

How Climate and Altitude Affect Hydration and Performance

Hot and Humid Conditions

Training or racing in the heat increases your sweat rate, sometimes up to 1.5 - 2.5 litres per hour. This results in greater fluid and electrolyte losses, placing strain on your cardiovascular system and increasing the risk of dehydration, heat illness, and fatigue.

According to the IOC consensus statement on exercising in the heat, even moderate dehydration can impair performance and cognitive function, especially in endurance events.

Altitude (Above 2,000m)

At higher altitudes, the air is colder and drier, and you breathe more rapidly, which increases water loss through respiration. You may not feel as thirsty, but dehydration can sneak up quickly, impacting blood volume, aerobic performance, and recovery.

According to Clinical Sports Nutrition by Louise Burke, fluid needs can increase by 1 -2 litres per day at altitude due to increased respiratory losses and dry conditions.

Hydration Challenges in Harsh Environments

• Blunted thirst response at altitude and in cold climates.
• Excessive sweat losses in hot, humid environments without adequate electrolyte replacement.
• Risk of hyponatremia from overhydrating with plain water, especially during long-duration events.

Tailored Hydration Strategies for All Athletes

1. Pre-Conditioning: Acclimate to heat or altitude over several days if possible. Gradual exposure helps your body adjust fluid balance, sweat rate, and plasma volume.

2. Prioritise Electrolytes: Electrolytes (especially sodium and potassium) are key in both heat and altitude to prevent cramping, maintain blood pressure, and avoid dilutional hyponatremia.

3. Adjust Fluid Intake Based on Conditions:

• In hot weather, athletes may need up to 1.5x their usual fluid intake.
• At altitude, aim for regular, small sips throughout the day, even without thirst.
• Monitor urine color and frequency as a rough hydration guide.

4. Recovery Counts: Post-exercise, aim to replace 150% of fluid lost (weigh yourself pre- and post-session) along with electrolytes to speed up recovery.

Why Mydrate is Built for the Elements

Whether you’re trail running at 2,500m or training through a heatwave, Mydrate® was created to meet the demands of real athletes in real conditions:

Electrolyte Rich Formula: Sodium, potassium, magnesium, and calcium, balanced for rehydration in extreme climates.
Smart Hydration: No unnecessary sugars or artificial additives, just what your body needs.
Functional Support: Includes adaptogens like ginseng, traditionally used to support vitality and energy.

Train Anywhere. Hydrate Smarter. Perform at Your Peak.

Whether you're navigating heat, elevation, or both, understanding how your environment affects hydration is a game-changer. With science-backed strategies and Mydrate in your corner, you can perform stronger, recover faster, and train smarter, wherever the terrain takes you.

Mydrate: Hydration designed for real-world conditions.

References:

1. Racinais, S., et al. (2023). IOC consensus statement on recommendations and regulations for sport events in the heat. British Journal of Sports Medicine, 57(1), 8–25. https://bjsm.bmj.com/content/57/1/8Europe PMC+2British Journal of Sports Medicine+2Waseda Elsevier Pure+2
   
   
2. Burke, L., Deakin, V., & Minehan, M. (2021). Clinical Sports Nutrition (6th ed.). McGraw-Hill Education. https://books.google.com/books/about/Clinical_Sports_Nutrition_6th_Edition.html?id=zNCYzgEACAAJGoogle Books+2Google Books+2Open Library+2