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Altitude training and muscular metabolism
1Dept. Clinical Physiology, Karolinska Hospital, Stockholm, Sweden.
International Journal of Sports Medicine
|October 1, 1992
Summary
Training at moderate altitudes enhances muscle metabolism, increasing myoglobin and oxidative enzymes. This simulated altitude training boosts endurance capacity, even when training volume matches sea-level efforts.
Area of Science:
- Exercise Physiology
- Sports Science
- Altitude Training
Background:
- Moderate altitude training impacts muscle metabolism and aerobic capacity.
- VO2max (maximal oxygen uptake) decreases at altitudes as low as 900m for elite athletes and 1200m for sedentary/well-trained individuals.
- Understanding altitude's effect on muscle physiology is crucial for optimizing athletic performance.
Purpose of the Study:
- To determine the lowest altitude affecting aerobic capacity.
- To compare muscle metabolism changes between training at 2300m and sea level.
- To investigate the combined effects of hypoxia and training intensity on muscle adaptations.
Main Methods:
- Defined the minimum altitude that reduces aerobic capacity.
- Compared training at 2300m versus sea level.
- Maintained consistent relative and absolute work intensities during training protocols.
Main Results:
- VO2max reduction observed at 1200m (sedentary/trained) and 900m (elite athletes).
- Altitude training led to increased myoglobin, oxidative enzyme activity, and endurance.
- A decrease in specific glycolytic enzyme activities was noted with altitude training.
Conclusions:
- Hypoxic stimulus from moderate altitude training, when matched with sea-level training volume, enhances muscle oxidative enzymes and myoglobin.
- Altitude training offers significant benefits for muscle adaptation and endurance capacity.
- Individual responses to altitude may vary based on training status.