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Related Experiment Videos

Anaerobic threshold and lactate turnpoint.

H A Davis, J Bassett, P Hughes

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1983
    PubMed
    Summary

    This study identified two key exercise intensity thresholds: the anaerobic threshold (AT) and the lactate turnpoint (LTP). Both thresholds were predictable from ventilatory responses, suggesting a link to motor unit recruitment during incremental exercise.

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    Area of Science:

    • Exercise Physiology
    • Sports Science
    • Human Physiology

    Background:

    • Understanding physiological responses to exercise is crucial for performance optimization and training.
    • Lactate accumulation during exercise is a key indicator of metabolic stress and intensity.
    • Identifying distinct thresholds during incremental exercise can inform training protocols.

    Purpose of the Study:

    • To investigate venous lactate concentration and ventilatory responses during incremental exercise.
    • To identify and characterize a second breakpoint in lactate accumulation, termed the lactate turnpoint (LTP).
    • To examine the relationship between the anaerobic threshold (AT), LTP, and motor unit recruitment patterns.

    Main Methods:

    • 16 healthy men performed incremental cycle ergometer tests to exhaustion.
    • Venous lactate concentrations and ventilatory responses were measured.
    • A second test was conducted during induced lactic acidosis to observe lactate dynamics.

    Main Results:

    • A characteristic curvilinear increase in venous lactate was observed, with both AT and LTP identified.
    • In a second test, lactate removal was evident at work rates exceeding the AT.
    • Despite differences in lactate response, the two breakpoints (AT and LTP) occurred at similar work rates in both tests.

    Conclusions:

    • The findings support a relationship between AT, LTP, and motor unit recruitment with distinct enzyme profiles.
    • Both AT and LTP are predictable from ventilatory responses during incremental exercise.
    • The study provides insights into physiological markers of exercise intensity.

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