High Altitude Training

How Altitude Works:

The Hypoxic Response:

• At altitude, air pressure drops → less oxygen per breath
• Body detects low oxygen via kidneys (HIF pathway)
• Kidneys release erythropoietin (EPO)
• EPO signals bone marrow to produce more red blood cells
• More red blood cells = higher oxygen-carrying capacity

Key Adaptations:

• Hematological: Increased red blood cell mass, hemoglobin, hematocrit
• Ventilatory: Improved breathing efficiency, higher ventilatory response
• Muscular: Enhanced mitochondrial function, capillary density
• Metabolic: Improved fat oxidation, glycogen sparing

Altitude Thresholds:

Timeline of Adaptations:

• Hours: Increased ventilation, heart rate
• Days 1-3: EPO peaks (2-3x baseline)
• Week 1-2: Red blood cell production increases
• Week 2-4: Measurable hemoglobin mass increase
• Week 3-6: Performance benefits manifest

Research Highlights:

• Levine & Stray-Gundersen (1997): Landmark LHTL study showing 3% improvement in 5K time
• Chapman et al. (1998): Identified responders vs non-responders based on EPO response
• Bonetti & Hopkins (2009): Meta-analysis found 1-4% performance improvement

Live High, Train Low (LHTL) - Gold Standard:

Natural Altitude Camps:

• Popular locations: Boulder/Flagstaff (USA), Font Romeu (France), Iten (Kenya), St. Moritz (Switzerland)
• Live at altitude, drive down to train
• Most practical for professional athletes

Altitude Tent Protocol:

• Set up tent in bedroom
• Start at equivalent of 2,000m, progress to 2,500-3,000m
• Sleep 8-10 hours per night in tent
• First week: adaptation (expect some sleep disruption)
• Weeks 2-4: full protocol
• Train normally during day

Altitude Mask Training (Different Mechanism):

• Does NOT simulate altitude (no low oxygen)
• Creates breathing resistance (inspiratory muscle training)
• May have some benefits, but not through EPO pathway
• See Inspiratory Muscle Training instead

Intermittent Hypoxic Training (IHT):

• Short exposures (1-2 hours) to hypoxia
• Less effective than LHTL
• May help with acclimatization before altitude travel

Camp Timing:

• Return from altitude 2-3 weeks before goal race
• Benefits peak 14-21 days post-altitude
• Some athletes compete directly from altitude

Training Adjustments at Altitude:

• Reduce intensity first 3-5 days
• Expect 5-15% performance decrease
• Increase hydration (higher fluid losses)
• Allow more recovery between sessions

Acute Mountain Sickness (AMS):

• Headache, nausea, fatigue, dizziness
• Usually occurs above 2,500m
• Most people acclimatize within 1-3 days
• Descend if symptoms worsen

Sleep Disruption:

• Very common first 1-2 weeks
• Periodic breathing patterns
• May affect recovery initially
• Usually resolves with acclimatization

Overtraining Risk:

• Altitude is a stressor
• Combined with hard training can lead to overreaching
• Monitor HRV and subjective fatigue
• Reduce training load initially

Altitude Tent Considerations:

• CO2 buildup if tent not properly ventilated
• Some find enclosed sleeping claustrophobic
• Need to monitor oxygen levels
• Partner may not want to sleep in tent

Contraindications:

• Severe anemia (get iron checked first)
• Uncontrolled hypertension
• Severe lung disease
• History of altitude sickness
• Pregnancy

Iron Requirements:

• Red blood cell production requires iron
• Many athletes become iron depleted at altitude
• Check ferritin before altitude camp
• Supplement if ferritin <50 ng/mL

Ideal Candidates:

• Competitive endurance athletes (runners, cyclists, triathletes, swimmers)
• Already training at high volume (10+ hours/week)
• Have specific performance goals
• Live near mountains OR can afford simulation equipment
• Have 3-4+ weeks to commit to protocol

Good Fit:

• Athletes preparing for major competition
• Those seeking marginal gains at elite level
• Professionals with access to altitude camps
• Serious amateurs with budget for altitude tent

Not Worth It For:

• Recreational athletes (better to focus on training fundamentals)
• Those with limited time (<3 weeks)
• Beginners (other interventions will give bigger gains)
• Anyone with altitude-related health concerns

Responder Considerations:

• ~50% of athletes are "responders" with strong EPO response
• ~25% are "non-responders" with minimal benefit
• ~25% have variable responses
• Only way to know is to try (or genetic testing)

What to Measure:

Blood Markers (Pre/Post Camp):

• Hemoglobin (expect 1-2 g/dL increase)
• Hematocrit (expect 2-4% increase)
• Ferritin (ensure adequate iron)
• Reticulocyte count (shows red cell production)

Performance Metrics:

• VO2max testing (expect 2-5% improvement)
• Time trial performances
• Lactate threshold pace
• Power at threshold

Daily Monitoring:

• SpO2 (pulse oximeter) - expect 88-94% at 2,500m
• Resting heart rate
• HRV trends
• Sleep quality
• Subjective energy/fatigue

Tools:

• Pulse oximeter - essential for tent users
• Oura Ring or WHOOP for HRV/sleep
• Training log for performance tracking
• Blood tests before and after camp

Expected Timeline:

• Week 1: Performance decrease, adaptation symptoms
• Week 2-3: Stabilization, beginning of adaptations
• Week 4+: Performance improvements emerge
• Post-altitude: Benefits peak 2-3 weeks after return

Altitude Tent Systems:

• Hypoxico ($5,000-8,000) - Industry leader, used by Olympic programs
• Altitude Tech ($3,000-5,000) - Good mid-range option
• Higher Peak ($2,500-4,000) - Budget-friendly

Components:

• Hypoxic generator (creates low-oxygen air)
• Tent enclosure (fits over bed)
• Pulse oximeter (monitor SpO2)
• Oxygen analyzer (verify tent levels)

Monitoring Equipment:

• Pulse Oximeter ($20-50) - Essential for safety
• Altitude watch - Tracks elevation if training in mountains

Altitude Masks (Different Purpose):

• Training Mask, Elevation Mask, etc.
• Do NOT simulate altitude (no hypoxia)
• Provide inspiratory muscle training instead
• Much cheaper ($30-80) but different mechanism

Natural Altitude (Living in Mountains):

• Free if you already live there
• Travel/accommodation costs for camps vary widely
• Professional camps: $2,000-5,000+ for 3-4 weeks

Altitude Tents:

Rental Options:

• Many companies rent altitude systems
• $500-1,500/month typical
• Good for trying before buying

Ongoing Costs:

• Electricity for generator
• Replacement filters
• Oxygen analyzer calibration

Cost-Benefit Analysis:

• Professional athletes: Usually worth it (sponsor funded)
• Serious amateurs: Rental for key training blocks
• Most athletes: Focus on other interventions first

Researchers:

• Benjamin Levine, MD - Pioneer of LHTL research at UT Southwestern
• Robert Chapman, PhD - Leading altitude physiology researcher
• Randall Wilber, PhD - USOC altitude expert

Practitioners:

• Elite endurance coaches worldwide use altitude camps
• Kenyan and Ethiopian runners train at natural altitude
• Many Olympic programs have altitude facilities

Athletes:

• Eliud Kipchoge - Trains in Iten, Kenya (2,400m)
• Mo Farah - Used altitude camps extensively
• Most elite marathoners and distance runners

Professional Use:

• Virtually all elite endurance programs use altitude
• USOC has altitude training facilities
• European cycling teams use altitude camps routinely
• Professional triathlon heavily uses altitude tents

Research Consensus:

• One of the most studied performance interventions
• Consistent findings across decades of research
• Individual variation is real but predictable

Common Experiences:

• "First week is rough, then you adapt"
• "The fitness gains are real and measurable"
• "Expensive but worth it for serious competition"
• "Sleep quality suffered but performance improved"

Criticisms:

• "Expensive and time-consuming"
• "Benefits lost within 2-4 weeks at sea level"
• "Not everyone responds equally"
• "Altitude tents are noisy and uncomfortable"

Essential Combinations:

• Iron supplementation - Required for red blood cell production
• Adequate sleep - Recovery crucial during adaptation
• Proper hydration - Fluid losses increased at altitude

Pairs Well With:

• Zone 2 Cardio - Base building at altitude
• HRV Training - Monitor adaptation and recovery
• Sleep Environment - Optimize tent sleeping
• Electrolytes - Replace increased losses

Timing Considerations:

• Avoid starting new hard training blocks at altitude
• First week should be reduced intensity
• Peak hard training in weeks 2-4
• Plan return timing carefully (2-3 weeks before race)

What to Avoid:

• Don't combine with other major stressors (caloric restriction, new supplements)
• Avoid altitude masks during altitude tent use (different mechanisms)
• Don't compete immediately upon arriving at altitude