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General introduction to altitude adaptation and mountain sickness
1Department of Internal Medicine, Division of Sports Medicine, Medical University Clinic, Heidelberg, Germany. heidelberg.de
Scandinavian Journal of Medicine & Science in Sports
|September 9, 2008
Summary
Altitude acclimatization improves oxygen delivery to tissues through physiological adaptations like increased red blood cells and enhanced blood oxygenation. While peak oxygen uptake remains unchanged, prolonged exposure aids well-being and performance at varying altitudes.
Area of Science:
- Physiology
- Environmental Medicine
- Sports Science
Background:
- Altitude exposure triggers physiological responses to maintain oxygen supply to tissues.
- Acclimatization involves complex adaptations in ventilation, cardiovascular function, and blood composition.
Purpose of the Study:
- To detail the physiological adaptations to altitude exposure.
- To describe the effects of altitude on oxygen transport and physical performance.
- To provide recommendations for safe ascent and training at altitude.
Main Methods:
- Review of physiological responses to acute and prolonged altitude exposure.
- Analysis of changes in oxygen-carrying capacity, cardiac output, and blood oxygen saturation.
- Examination of altitude-related illnesses and performance impacts.
Main Results:
- Altitude acclimatization enhances oxygen delivery via increased erythropoiesis and hemoglobin mass, improving blood oxygen-carrying capacity.
- While arterial oxygen content normalizes, peak oxygen uptake is not significantly altered after prolonged exposure.
- Adaptations begin at 1000 m a.s.l. and become prominent from 2000 m a.s.l., with reduced maximal heart rate at higher altitudes.
- Acute mountain sickness occurs at 2500-3000 m a.s.l.; severe edema is rare below 3000-4000 m a.s.l.
Conclusions:
- Gradual ascent and staged acclimatization are recommended to minimize altitude sickness and optimize well-being.
- Understanding altitude effects is crucial for developing strategies for performance enhancement using hypoxic training.
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