How to Build a 4-Week Altitude Training Block (With Sample Weekly Plan)
A science-backed framework for structuring a 4-week altitude training block, with periodization principles, sample weekly schedules, and key physiological benchmarks for endurance athletes.
How to Build a 4-Week Altitude Training Block (With Sample Weekly Plan)
An altitude training plan is not simply taking your regular training schedule to a higher elevation. Altitude fundamentally changes how your body responds to exercise stress: recovery is slower, high-intensity work degrades faster, and the erythropoietic stimulus you're seeking requires careful management of load to avoid overtraining before the adaptations can consolidate. Get the structure right, and 4 weeks at altitude can produce measurable performance gains that last 3–6 weeks post-camp. Get it wrong, and you'll come home fatigued and slower.
This guide provides a periodization framework grounded in current sports science, a sample 4-week weekly plan, and the physiological benchmarks you should hit at each phase.
The Physiological Timeline: What Happens Week by Week
Understanding the timeline of altitude adaptation is essential to structuring training load correctly.
Days 1–5: Acute Response Phase
Your body is in stress-response mode. Plasma volume drops (hemoconcentration temporarily inflates hemoglobin readings). Ventilation rate increases significantly at rest and during exercise. Heart rate is elevated at any given training pace. Sleep is disrupted by Cheyne-Stokes periodic breathing. EPO surges within 24–48 hours of arrival — the erythropoietic signal is already firing.
Training implication: This is the worst time to train hard. Your muscles are being asked to work with less oxygen while your body hasn't yet built the machinery to compensate. Athletes who hammer high-intensity sessions on days 1–3 consistently report worse adaptation outcomes and higher AMS rates.
Days 6–14: Early Acclimatization Phase
Ventilation rate stabilizes at a new, higher baseline. Plasma volume begins to recover. The early EPO surge starts tapering (EPO peaks around day 2–3, then falls as the kidneys sense improved hemoglobin mass), but reticulocyte count (immature red blood cells) climbs, signaling bone marrow is responding. SpO₂ improves from arrival nadir by 2–4 percentage points. Sleep quality partially recovers.
Training implication: Carefully reintroduce intensity. Aerobic base work remains the emphasis. One quality session per week maximum. Monitor recovery closely — if you feel substantially worse after an interval session, the session was premature.
Days 15–21: Mid-Acclimatization Phase
The major physiological work is underway. Red blood cell mass begins increasing measurably. 2,3-DPG (an enzyme that facilitates oxygen unloading from hemoglobin to tissues) rises, improving peripheral oxygen delivery. Muscle buffering capacity adapts. Trained athletes often note a "breakthrough" around day 14–18 where training feels significantly easier than the first week.
Training implication: This is the most productive training window. Introduce structured quality work (threshold intervals, race-pace efforts). Volume and intensity can approach normal training loads if acclimatization markers are on track.
Days 22–28: Consolidation Phase
Hemoglobin mass continues accumulating. The physiological gains are largely in place. The final week is about maintaining the stimulus without creating pre-competition fatigue.
Training implication: Begin a partial taper. Reduce volume by 20–30% while preserving some intensity. Set up for the post-camp performance window.
Altitude Selection: Getting the Elevation Right
The most common error in altitude camp planning is selecting the wrong elevation.
Below 2,200 m: Insufficient hypoxic stimulus for meaningful EPO response or hematological adaptation. Fine for acclimatization before a race at that altitude, but not for performance-enhancement camps.
2,200–2,700 m: The evidence-based sweet spot for most endurance athletes. Sufficient hypoxic stimulus to drive EPO and red blood cell adaptation; low enough that training quality is preservable.
2,700–3,200 m: Greater hypoxic stimulus; however, training intensity must be significantly reduced, especially in the first two weeks. Best for LHTL protocols (sleeping high, training at lower elevation).
Above 3,200 m: Compromises training quality significantly. Most appropriate only for acclimatization before high-altitude events (e.g., Leadville, La Paz marathons) rather than performance-enhancement camps.
If using LHTL: The classic evidence-based protocol is sleeping at 2,500–3,000 m and training at 1,200–1,500 m. If a single location is required, aim for 2,200–2,500 m as the best compromise between training quality and hypoxic stimulus.
Sample 4-Week Altitude Training Block
This plan is designed for an intermediate-to-advanced endurance athlete (runner, cyclist, or triathlete) with a base training load of 10–14 hours per week at sea level. Adjust volume by ±20% for lighter or heavier training loads.
Week 1: Arrival and Aerobic Base (Load = 60–70% of normal)
Goal: Acclimatize, assess how your body responds, avoid digging a recovery hole.
| Day | Session | Notes |
|---|---|---|
| Mon | REST | Travel/arrival day. Hydrate aggressively. |
| Tue | 45–60 min easy aerobic (RPE 3–4/10) | No HR ceiling — just easy. SpO₂ check post-run. |
| Wed | 60–75 min easy aerobic + strides | 6 × 20-second strides at end. |
| Thu | REST or 30 min light recovery jog | Listen to body. AMS symptoms → full rest. |
| Fri | 60–90 min long easy run | Flat terrain. Maintain conversational pace. |
| Sat | 45–60 min aerobic + drills | Technique focus. |
| Sun | REST | Mandatory. |
Week 1 physiological benchmarks:
- Morning SpO₂ should improve from arrival nadir to ≥88% (at 2,500 m) by day 5
- Resting HR should begin declining from elevated arrival reading
- AMS symptoms (if present) should be largely resolved by day 4–5
Week 2: Progressive Loading (Load = 75–85% of normal)
Goal: Begin quality reintroduction. Add one structured workout.
| Day | Session | Notes |
|---|---|---|
| Mon | 60–75 min easy aerobic | SpO₂ and HR morning check. |
| Tue | 60–90 min with tempo intervals: 3 × 10 min at threshold | Adjust pace — your threshold pace will be 8–12 sec/km slower than sea level. |
| Wed | 45–60 min recovery run | Keep HR low; true recovery pace. |
| Thu | 90 min long aerobic run | Some elevation gain if terrain allows. |
| Fri | REST | |
| Sat | 75–90 min including fartlek | 8–10 × 1 min at 5K effort with 2 min jog recovery. |
| Sun | 45–60 min easy |
Week 2 physiological benchmarks:
- Morning SpO₂ should be stable or improving daily
- Threshold sessions feel hard but doable — if they feel impossible, you've ascended too high or too fast
- Recovery between sessions improving versus Week 1
Week 3: Quality Phase (Load = 90–100% of normal)
Goal: Peak training load of the camp. Maximum productive training window.
| Day | Session | Notes |
|---|---|---|
| Mon | 60–75 min easy aerobic | |
| Tue | VO₂ max workout: 5 × 5 min at hard effort (SpO₂ will drop to 80–85%) | 3 min recovery jog between. This session is demanding — rate of perceived exertion will be high. |
| Wed | 45–60 min active recovery | Easy spin or jog only. |
| Thu | 75–90 min long aerobic + threshold finish: 20 min at threshold pace | Finish of long run at elevated effort. |
| Fri | REST or 30 min easy | |
| Sat | Race-pace simulation: 3 × 15 min at 10K goal pace | Critical quality session. |
| Sun | 90–120 min long run (aerobic, Zone 2) | Longest aerobic run of the camp. |
Week 3 physiological benchmarks:
- You should feel noticeably stronger at a given RPE compared to Week 1
- SpO₂ during VO₂ max intervals may drop to 78–83% — this is normal at altitude
- Recovery between hard days improving; 48 hours typically sufficient
Week 4: Consolidation and Taper (Load = 65–75% of normal)
Goal: Lock in adaptations, reduce accumulated fatigue, prepare for post-camp performance window.
| Day | Session | Notes |
|---|---|---|
| Mon | 45–60 min easy aerobic | |
| Tue | Short quality: 4 × 5 min at threshold + 4 × 1 min at VO₂ max | Reduced total volume, maintained intensity. |
| Wed | REST | |
| Thu | 60 min aerobic with 6 × 30-sec strides | |
| Fri | 45 min easy + relaxed strides | |
| Sat | Final camp run: 45–60 min including some race pace | Last quality stimulus. |
| Sun | Travel/departure or complete REST |
Key Nutritional Considerations at Altitude
Iron Supplementation
Altitude training dramatically increases iron demand. The EPO-driven red blood cell production surge requires abundant iron substrate. Arrive at altitude with ferritin ≥ 50 ng/mL (ideally ≥ 80 ng/mL). Athletes with depleted iron stores will not generate the hematological adaptations the camp is designed to produce.
Have ferritin tested 4–6 weeks before the camp. If below 40 ng/mL, work with a sports medicine physician on repletion protocol before the camp.
Carbohydrate and Caloric Intake
Altitude suppresses appetite via leptin and ghrelin dysregulation. Many athletes unintentionally under-fuel for the first 1–2 weeks, which impairs recovery and muscle repair. Eat by schedule, not hunger, especially in Week 1.
Carbohydrate demand is elevated because the body shifts toward glycolytic (carbohydrate-burning) metabolism under hypoxia. Maintain carbohydrate intake at or above sea-level levels: 6–10 g/kg/day depending on training volume.
Hydration
Altitude increases insensible fluid losses via increased respiratory rate and drier air. Daily fluid requirements increase by approximately 0.5–1 L above sea-level needs. Urine should remain pale yellow. Dehydration worsens AMS, impairs SpO₂, and reduces training quality.
Planning Your Post-Camp Performance Window
The adaptations made at altitude — particularly the red blood cell mass increase — are not destroyed the moment you descend. They persist for 3–6 weeks post-camp. However, the optimal window for performance (when hematological gains are maximal but fatigue has cleared) is typically days 14–21 post-descent.
Timing your target race: Plan key races for 2–3 weeks after the end of your altitude block. Races in the first week post-descent often underperform because fatigue hasn't yet cleared. Races 4+ weeks post-descent miss the hemoglobin mass peak.
Key Takeaways
- Week 1 is for acclimatization, not training gains — protect this week and resist the urge to train hard.
- The productive quality window opens in Week 3, once acclimatization markers normalize.
- Target altitude 2,200–2,500 m for the best balance of erythropoietic stimulus and training quality.
- Plan key races 14–21 days post-camp to align with peak hematological adaptation.
- Arrive with ferritin ≥ 50 ng/mL and maintain carbohydrate and hydration intake even when appetite is suppressed.
- Monitor morning SpO₂ and resting HR daily — these are your real-time indicators of whether training load is appropriate.
Structure Your Next Altitude Block
Want a customized version of this plan based on your event, current training load, and target altitude? Our Altitude Training Plan Builder generates a week-by-week periodized block tailored to your goals. Subscribe to our newsletter for more altitude physiology deep-dives and training plan templates.