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Performing at extreme altitude: muscle cellular and subcellular adaptations
1Department of Anatomy, University of Bern, Buehlstrasse 26, 9, 3000 Bern, Switzerland.
European Journal of Applied Physiology
|August 5, 2003
Summary
High-altitude climbing causes muscle damage due to hypoxia and stress, leading to reduced aerobic capacity. Sherpas may possess antioxidant mechanisms protecting their muscles from these extreme altitude effects.
Area of Science:
- Physiology
- Altitude Medicine
- Muscle Biology
Background:
- Successful high-altitude climbing (>8000m) requires understanding physiological and structural adaptations.
- Extreme environments pose significant challenges to human performance and tissue integrity.
Purpose of the Study:
- To elucidate the functional and structural consequences of prolonged exposure to extreme altitudes.
- To identify specific muscle tissue alterations under conditions of severe hypoxia and stress.
Main Methods:
- Combined whole-body physiological measurements with biochemical, histochemical, and morphometric analyses of muscle biopsies.
- Investigated muscle tissue changes in response to extreme altitude exposure.
Main Results:
- Established specific phenotypical alterations in muscle tissue due to prolonged extreme hypoxia and stress.
- Demonstrated that reduced aerobic work capacity results from loss of muscle mass and oxidative capacity, while capillarity is maintained.
- Observed an increase in muscle lipofuscin, indicative of lipid peroxidation and potential mitochondrial loss.
Conclusions:
- Muscle degradation at extreme altitudes is characterized by loss of mass and oxidative capacity, with maintained capillarity.
- Increased lipofuscin suggests lipid peroxidation and mitochondrial damage.
- Sherpas may exhibit enhanced antioxidant mechanisms that protect their muscles against the detrimental effects of extreme altitude hypoxia.