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Functional adaptations to physical activity and inactivity

B Saltin, L B Rowell

    Federation Proceedings
    |April 1, 1980
    PubMed
    Summary
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    Physical activity enhances maximal aerobic power by improving oxygen transport to muscles. Training increases blood flow and capillary density, boosting oxidative capacity for better submaximal work performance.

    Area of Science:

    • Exercise physiology
    • Cardiovascular adaptation
    • Metabolic system function

    Background:

    • Focuses on physiological system alterations during physical activity adaptation.
    • Highlights the role of circulatory, respiratory, and metabolic systems.
    • Challenges traditional performance-centric views of adaptation.

    Purpose of the Study:

    • To emphasize the magnitude of functional changes in physiological systems with adaptation to physical activity.
    • To propose that oxygen transport by the circulation limits maximal aerobic power.
    • To explain the mechanisms behind increased aerobic power and submaximal work capacity.

    Main Methods:

    • Review and synthesis of existing literature on exercise physiology and adaptation.
    • Analysis of physiological responses to physical conditioning.

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  • Focus on circulatory, respiratory, and metabolic system changes.

    • Main Results:

    • Maximal aerobic power is primarily limited by oxygen transport to working muscles.
    • Physical conditioning increases maximal aerobic power mainly through enhanced muscle blood flow and capillary density.
    • Skeletal muscle's oxidative potential increases post-training, augmenting submaximal work capacity.

    Conclusions:

    • Adaptation to physical activity involves significant functional alterations in key physiological systems.
    • Cardiovascular adaptations, specifically increased muscle blood flow and capillary density, are crucial for enhancing maximal aerobic power.
    • Improved skeletal muscle oxidative capacity is a key factor in augmenting submaximal work performance.