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[Physical training in high altitude]

P R Moret, P Bopp, A Righetti

    Schweizerische Medizinische Wochenschrift
    |November 7, 1981
    PubMed
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    High altitude exposure in the Himalayas altered heart muscle

    Area of Science:

    • Cardiovascular Physiology
    • Altitude Medicine
    • Exercise Physiology

    Background:

    • Understanding myocardial substrate utilization is crucial for assessing cardiac function under stress.
    • High altitude environments present unique challenges to cardiovascular adaptation.
    • Previous research has not fully elucidated the impact of prolonged high-altitude exposure on myocardial substrate metabolism.

    Purpose of the Study:

    • To investigate the effects of high-altitude exposure on hemodynamic parameters and myocardial substrate (lactate and free fatty acids) extraction in mountain climbers.
    • To determine if physical training combined with hypoxemia alters myocardial substrate metabolism.
    • To analyze changes in myocardial extraction of lactate and free fatty acids at rest and during exercise post-expedition.

    Main Methods:

    Related Experiment Videos

    • Studied 9 mountain climbers before and after a 4-week expedition to 5500-7000 m in the Himalayas.
    • Measured hemodynamic parameters, VO2 max, and myocardial extraction of lactate and free fatty acids (FFA) at rest and during bicycle exercise.
    • Utilized a combined approach of physiological measurements and substrate analysis.

    Main Results:

    • Hemodynamic parameters, VO2 max, lactate production, and FFA decrease during exercise remained unchanged.
    • Myocardial extraction of lactate increased both at rest and during exercise after the high-altitude stay.
    • Myocardial extraction of free fatty acids (FFA) decreased at rest and during exercise post-expedition.

    Conclusions:

    • Prolonged high-altitude exposure significantly alters myocardial substrate preference, increasing lactate uptake and decreasing FFA uptake.
    • These metabolic shifts in the heart muscle may represent an adaptive response to chronic hypoxemia.
    • Further research is needed to understand the long-term implications and functional significance of these myocardial metabolic adaptations.