For athletes constantly seeking an edge, the path to peak performance sometimes lies miles above sea level. High altitude fitness training, also known as elevation training, has become a cornerstone strategy for endurance athletes looking to unlock new levels of cardiovascular capacity. But is it just about struggling for air, or is there genuine science behind the hype?
Training where the air is thin forces the body to adapt in remarkable ways. By understanding the physiology and following a smart protocol, athletes can return to sea level stronger, faster, and more resilient. Here’s what you need to know about training at altitude.
The Physiological Edge: More Than Just Thin Air
When you exercise at high altitudes, the lower oxygen levels (hypoxia) place unique stress on the body. In response, it triggers a series of adaptations that can significantly boost endurance performance.
1. Supercharging Oxygen Delivery
The most celebrated benefit of altitude training is its impact on blood chemistry. A 2016 study found that training in low-oxygen conditions stimulates the production of erythropoietin (EPO) , a hormone that signals the body to produce more red blood cells. With more red blood cells, the blood becomes more efficient at carrying oxygen to working muscles. This helps delay fatigue and, crucially, this adaptation persists upon returning to sea level, giving athletes a sustained boost in oxygen delivery during competition.
2. Increasing Aerobic Capacity (VO2 Max)
Your VO2 max is the gold standard measure of aerobic endurance—the maximum amount of oxygen your body can utilize during intense exercise. Research indicates that altitude training can push this number higher. A 2013 study on elite distance runners showed improvements in VO2 max after 28 days of using the “live high, train low” (LHTL) method. Similarly, a 2020 study confirmed that just 11 days at altitude could enhance VO2 max, potentially translating to faster times at sea level.
3. Building a Higher Tolerance for Lactic Acid
Intense exercise leads to the production of lactic acid, the buildup of which causes that familiar burning sensation and eventual muscle fatigue. According to a 2018 review, altitude training can increase the body’s buffer capacity, allowing it to tolerate higher levels of lactate before fatigue sets in. This means you can sustain a higher intensity for longer periods.
How to Incorporate Altitude Training Safely
To reap the rewards without risking your health, a strategic approach is essential. Here are key techniques for integrating altitude training into your routine:
- Embrace the “Live High, Train Low” Model: This popular method involves sleeping and resting at high altitude to stimulate red blood cell production, but performing high-intensity workouts at lower altitudes. This allows you to train at maximum intensity while still getting the physiological adaptation from the altitude.
- Reduce Initial Intensity: Upon arriving at altitude, immediately cut your training intensity. You will be slower, and that’s normal. Pushing too hard too soon invites injury and altitude sickness. Give your body at least one to two weeks to acclimate.
- Practice Gradual Ascent: Avoid going from sea level to 10,000 feet overnight. Increase your elevation gradually over several days to allow your body to adjust.
- Incorporate Hill Intervals: A practical way to simulate altitude effects at home is through hill training. Running hard up a hill and jogging easily down mimics the intensity variation of altitude work and builds cardiovascular power.
- Master Breathing Exercises: Diaphragmatic breathing and other respiratory muscle training can improve lung capacity and efficiency, helping you cope better with thin air.
Potential Downsides and Crucial Precautions
Altitude training is not without risks. The most common pitfall is ascending too quickly or training too hard at elevation, leading to altitude sickness. Symptoms include headache, nausea, fatigue, and loss of appetite. In rare, severe cases, it can escalate to dangerous fluid buildup in the brain or lungs.
To mitigate these risks, athletes must:
- Stay Hyper-Hydrated: You lose more water through respiration in dry mountain air, so drinking plenty of fluids is critical.
- Climb Slowly and Listen to Your Body: If you feel unwell, descend and rest.
- Consult a Professional: Anyone with pre-existing conditions like diabetes, heart disease, or lung issues should get medical clearance before attempting altitude training.
- Check Your Iron Levels: Iron is essential for hemoglobin production. Working with a dietitian to correct any iron deficiencies before you go to altitude is crucial, as low iron will impair your body’s ability to produce those performance-boosting red blood cells.
The Takeaway
High altitude training is a potent tool for the dedicated athlete. By strategically stressing the body with low oxygen, you can trigger physiological adaptations—increased red blood cells, higher VO2 max, and greater lactate tolerance—that translate into superior endurance. The key is respect: respect for the altitude, a slow and steady approach, and a keen awareness of your body’s signals. Done right, training in the clouds can help you perform like never before on solid ground.