High-altitude training

Altitude training is one of the most effective yet demanding methods for improving performance in competitive cycling. Professional teams use it strategically before mountain stages and Grand Tours; ambitious amateurs head to the Alps or highlands – but without solid knowledge, overtraining, performance drops, or health risks are likely. This guide explains the physiological foundations, common methods, and practical implementation for racers at all performance levels.

What Is Altitude Training?

Altitude training refers to a deliberate stay in a reduced-oxygen atmosphere to trigger physiological adaptations in the body. From around 1,500 meters, the partial pressure of oxygen drops noticeably, so less O₂ diffuses into the blood. The body responds with structural and functional changes that can improve aerobic capacity after returning to low altitude.

In cycling, altitude training is especially relevant for climbers, GC riders, stage races with high-altitude stages, and competitions at elevation.

Physiological Foundations

Oxygen Transport and RBC production

At altitude, the body registers a relative lack of oxygen (Hypoxic stress). The kidneys release more erythropoietin (EPO), which stimulates red blood cell production in the bone marrow. More erythrocytes mean higher hemoglobin concentration and thus improved oxygen transport to working muscles – a key advantage on long climbs and under high load.

Further Adaptations

Beyond erythropoiesis, capillary density, mitochondrial count, and lactate tolerance increase. Breathing economy improves, so oxygen is used more efficiently.

Acute Altitude Response

In the first days, performance drops: higher heart rate, headaches, and sleep disturbances are typical. After 10–14 days the state stabilizes; full acclimatization takes three to four weeks.

Altitude Training Methods

Live High, Train High (LHTH)

The athlete lives and trains at altitude. This classic method maximizes hypoxic stimulus but often leads to reduced training intensity because high wattages are harder to achieve at elevation. LHTH suits endurance blocks focused on volume and moderate intensity.

Live High, Train Low (LHTL)

With LHTL, the athlete sleeps and spends most of the day at altitude (from 2,000 m) but trains part of the time at low altitude or moderate elevation at full intensity. Hypoxic stimulus is preserved while quality sessions such as threshold or interval training remain unrestricted. LHTL is considered the gold standard in professional cycling today.

LLTH and Intermittent Training

With Live Low, Train High, the athlete simulates altitude only during training – evidence is mixed. Intermittent stays (2–3 weeks, several times per season) fit well into periodization.

Optimal Altitude and Duration

Altitude Zones

Timing

The duration of an altitude stay depends on the season goal:

1. Short stay (7–10 days): Acclimatization for individual high-altitude races, limited hemoglobin effect
2. Standard block (3–4 weeks): Optimal balance of adaptation and training quality
3. Extended stay (5–6 weeks): For pros with sufficient recovery capacity
4. Re-exposure: 10–14 days before an important mountain race as a refresher

Training at Altitude

Intensity Adjustment

At altitude, maximum power drops by roughly 1–2 % per 300 m of elevation gain. A rider who holds 300 watts at threshold at low altitude often reaches only 260–270 watts at 2,500 m. Therefore:

• Base endurance is the focus at altitude – ideal for base endurance training
• Intensive sessions should be postponed in the first days or moved to low altitude
• Heart rate instead of watts as guidance during acclimatization
• Cadence slightly higher to compensate for reduced power

Typical Weekly Structure at an Altitude Camp

• Monday: Rest day or active recovery (easy ride 60–90 min)
• Tuesday: Long base endurance ride (3–5 h), rolling terrain
• Wednesday: Moderate intervals in zone 2 or threshold training at low altitude (LHTL)
• Thursday: Medium base endurance ride (2–3 h)
• Friday: Quality session – threshold or interval training in the lowlands
• Saturday: Long base endurance ride with group
• Sunday: Short easy session or full rest day

Nutrition and Hydration

Fluid needs increase at altitude. Iron-rich nutrition supports erythropoiesis; calorie intake must cover the higher basal metabolic rate. Alcohol disrupts sleep and acclimatization and should be avoided.

Risks and Countermeasures

Acute Mountain Sickness (AMS)

With ascent that is too rapid or individual sensitivity, symptoms of acute mountain sickness can occur: headache, nausea, dizziness, sleep disturbances. With severe symptoms (HACE, HAPE), immediate descent is life-saving.

Warning signs: persistent headache, vomiting, confusion, shortness of breath at rest – descend immediately with severe symptoms.

Overtraining and Immune System

Longer stays raise cortisol levels and weaken the immune system. Adequate sleep and recovery and controlled load are essential.

Hematocrit and Health

Too large an increase in hematocrit raises blood viscosity and thus thrombosis risk. Professionals are monitored medically on a regular basis. Amateurs should consider performance diagnostics including a blood panel before and after an altitude block.

Altitude Training for Different Rider Types

Climbers and GC Riders

For riders targeting points in Grand Tours and summer high-mountain stages, two altitude blocks per season are common: one in winter (base block) and one 3–4 weeks before the main stage.

Sprinters, Hobby and Masters Riders

Sprinters use moderate altitude stays (10–14 days) mainly for aerobic base. Amateurs are best starting with 10–14 days at 1,800–2,200 m and keeping intensity deliberately low in the first days.

Checklist: Preparing for an Altitude Camp

• Medical examination and current blood panel
• FTP test or VO₂max test as baseline
• Set altitude and duration (3–4 weeks from 2,000 m recommended)
• Research accommodation and training routes
• Clarify LHTL logistics (commuting to the valley for quality sessions)
• Nutrition plan with focus on iron and fluids
• Sleep hygiene: dark room, no late meals
• Emergency plan for AMS symptoms (descent route, doctor)
• Equipment check: warm clothing for descents, sun protection
• Plan return travel 10–14 days before target race

Simulating Altitude Training at Home

Altitude tents and hypoxia generators simulate 2,000–3,000 m while sleeping (LHTL principle). Effectiveness is scientifically debated – home solutions can supplement but do not replace a real altitude stay.

Integration into Season Planning

Altitude training does not work in isolation but only in the context of a holistic training fundamentals strategy. The optimal sequence:

1. Build a solid aerobic base at low altitude (8–12 weeks)
2. First altitude block in the winter/early spring phase
3. Race phase with moderate volume and targeted intensity
4. Second altitude block before the main season
5. Tapering with reduced volume and maintenance stimulus
6. Competition in the supercompensation performance window

Professional teams use camps in Sierra Nevada, Livigno, or Colorado; amateurs find suitable regions in the Bavarian Alps or South Tyrol.

Conclusion

Altitude training increases aerobic capacity – provided planning and intensity are right. LHTL offers the best balance of hypoxic stimulus and training quality. Beginners should start moderately and shorter rather than too high and too long.

Related Topics

• Periodization – Systematic training build-up across the season
• Base Endurance – Foundation for effective altitude training
• Performance Diagnostics – Measuring FTP, lactate, and VO₂max before and after altitude blocks
• Recovery – Rest as the key to supercompensation
• Summer High Mountains – Races for which altitude training is especially relevant