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Blood lactate concentrations during incremental work before and after maximum exercise.

H A Davis, G C Gass

    British Journal of Sports Medicine
    |December 1, 1979
    PubMed
    Summary
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    This study investigated blood lactate behavior during intense exercise. A distinct lactate threshold was identified, representing a balance between lactate release and removal, not the anaerobic threshold.

    Area of Science:

    • Exercise Physiology
    • Sports Science
    • Biochemistry

    Background:

    • Understanding exercise intensity thresholds is crucial for training and performance.
    • Lactate accumulation is a key indicator of metabolic stress during physical exertion.
    • Previous research has debated the precise definition and physiological correlates of the lactate threshold.

    Purpose of the Study:

    • To investigate venous blood lactate concentration changes during successive incremental exercise tests.
    • To identify the work rate at which lactate release and removal reach a balance.
    • To differentiate this balance point from the traditional anaerobic threshold.

    Main Methods:

    • Five male subjects underwent three incremental cycle ergometer tests.
    • Tests were separated by varying rest and high-intensity intervals.

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  • Venous blood lactate concentrations were measured throughout the tests.

    • Main Results:

    • Lactate concentrations decreased at higher work rates in the third test, unlike the first two.
    • A consistent work rate for rapid lactate increase was observed across all tests.
    • This point indicated a balance between lactate release and removal, not solely anaerobic production.

    Conclusions:

    • The identified threshold reflects a balance between lactate homeostasis and production, not the anaerobic threshold.
    • Steady-state exercise above this threshold may lead to sustained increases in blood lactate.
    • Further research is needed to fully elucidate the implications of this lactate balance threshold.