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Severe repetitive exercise and haematological status.

J H Ross, E C Attwood

    Postgraduate Medical Journal
    |July 1, 1984
    PubMed
    Summary

    Severe exercise initially lowers hematocrit and hemoglobin due to plasma volume expansion, not significant red blood cell breakdown. Oxygen levels remain stable, suggesting no need for increased hemoglobin during intense training.

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    Area of Science:

    • Exercise physiology
    • Hematology
    • Sports science

    Background:

    • Understanding physiological adaptations to intense physical exertion is crucial.
    • Hematological changes during exercise can impact oxygen transport.
    • Repetitive, severe exercise presents unique physiological challenges.

    Purpose of the Study:

    • To investigate the impact of severe repetitive exercise on key hematological parameters.
    • To elucidate the underlying mechanisms responsible for observed changes in hematocrit and hemoglobin.
    • To assess the relationship between hematological shifts and tissue oxygenation.

    Main Methods:

    • Monitoring hematological measurements (hematocrit, hemoglobin) over a 3-week period.
    • Implementing a protocol of increasingly severe repetitive exercise.
    • Analyzing potential contributing factors like hemolysis and plasma volume changes.

    Main Results:

    • A significant decrease in hematocrit and hemoglobin was observed within the first 2 weeks of exercise.
    • These decreases plateaued and were not evident in the third week.
    • Plasma volume expansion was identified as the primary driver, with hemolysis playing a minor role.

    Conclusions:

    • The reduction in hematocrit and hemoglobin during severe exercise is mainly attributed to plasma volume expansion.
    • Tissue oxygen tension remains adequate, indicating no physiological stimulus for increased hemoglobin concentration.
    • These findings offer insights into the adaptive responses of the circulatory system to intense training.

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