The Scientific Benefits of Altitude Training on Cyclists' Hemoglobin

Introduction

Every winter, the world’s top road cyclists head to Tenerife in Spain (2,300m altitude), the Swiss Alps (1,800m altitude), or the Colorado Plateau (2,800m altitude) for training camps. Altitude training has one core goal: stimulating the body to produce more red blood cells and enhance oxygen-carrying capacity. But for Taiwanese cyclists, how should an altitude training strategy be planned?

Physiological Challenges of the Altitude Environment

At high altitudes, the partial pressure of oxygen (PO₂) decreases as elevation increases:

The hypoxic environment triggers a series of compensatory responses: increased heart rate, increased ventilation, and activation of hypoxia-inducible factor (HIF-1α). The activation of HIF-1α is the key trigger for the physiological adaptations of altitude training.

Main Physiological Adaptations of Altitude Training

Short-Term Adaptations (Days–2 weeks after arrival)

• Increased ventilation: Increased breathing compensates for hypoxia, leading to excessive CO₂ exhalation (respiratory alkalosis)
• Elevated heart rate: Heart rate is 10–20 bpm higher than at sea level at the same power output
• Decreased plasma volume (7–10 days): Initial blood “concentration” makes the red blood cell ratio appear elevated, but the actual red blood cell count has not increased
• Decreased performance: Performance typically declines during the first 1–2 weeks; no need to worry

Medium- to Long-Term Adaptations (2–4+ weeks)

• Elevated erythropoietin (EPO): The hypoxic environment stimulates the kidneys to secrete EPO, with elevations detectable within 24–48 hours
• Increased red blood cell production: EPO promotes the bone marrow to produce more red blood cells, which takes 2–4 weeks to become significantly reflected in the blood
• Increased hemoglobin concentration: Hemoglobin Mass can typically increase by 3–8% after altitude training
• Mitochondrial adaptations: The hypoxic environment also stimulates mitochondrial biogenesis and oxidative enzyme activity in muscle cells

Main Altitude Training Models

HiLo (Live High, Train Low) is currently the most scientifically recommended model: live at 1,800–2,500m altitude (to stimulate EPO and red blood cell production), and train at lower altitudes (<1,500m) (to maintain training intensity and quality).

Altitude Training Strategies for Taiwanese Cyclists

Taiwan’s Altitude Resources

Taiwan possesses uniquely advantageous high-altitude environments:

• Wuling (3,275m): The highest point on Taiwan’s road network, with accommodation available at Wuling Lodge
• Cingjing Farm (1,750m): Comfortable accommodation, suitable as a HiLo training base
• Taipingshan (2,000m): Pleasant climate, can serve as a training base

Recommended Plan (HiLo Adaptation):

1. Stay at Cingjing Farm or Lishan (1,700–2,000m altitude)
2. Descend daily to Puli or the Taichung area (altitude <400m) for high-intensity training
3. Duration: 3–4 weeks
4. Sleep at high altitude every night (14–16 hours/day) to provide continuous EPO stimulation

Timing of Altitude Training

• The effects of altitude adaptation peak approximately 2–4 weeks after returning to low altitude (red blood cell maturation takes time)
• The effects gradually diminish after lasting about 2–4 weeks
• It is recommended to schedule important races 2–3 weeks after returning to low altitude

Practical Recommendations

• Avoid high-intensity training during the first week at altitude to allow the body to adapt to the hypoxic environment first
• Iron supplementation (through diet or supplements) is crucial for altitude training—iron deficiency limits red blood cell production and is a common cause of failed altitude training
• The risk of dehydration is high at altitude (increased ventilation, water evaporation): daily water intake should be increased by 500–1000ml
• If persistent headache, nausea, or coordination difficulties occur, it may be acute mountain sickness (AMS), and you should descend immediately
• For cyclists who cannot travel to high altitudes, a hypoxic tent can simulate a hypoxic environment in the bedroom for 8–10 hours per night, with effectiveness approximately 50–70% of real altitude

Related Reading

• Benefits of Altitude Training for Cyclists: The Effects of Altitude on Red Blood Cells
• Benefits of High-Altitude Training for Cyclists: The Natural Advantages of Taiwan’s Wuling
• High-Altitude Training Guide: How Flatland Athletes Can Use the Altitude Effect to Improve Performance
• The Physiology of High-Altitude Cycling: Red Blood Cell Production and Performance Enhancement