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Oxygen deficit during incremental exercise

H A Davis, G C Gass, D Eager

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1981
    PubMed
    Summary
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    This study calculated oxygen deficit during incremental exercise, finding it smaller than during steady-state exercise. This method can assess anaerobic capacity but cannot differentiate between lactacid and alactacid components.

    Area of Science:

    • Exercise Physiology
    • Sports Science
    • Human Performance

    Background:

    • Traditionally, oxygen deficit and debt are measured during constant workload exercise.
    • Incremental exercise tests offer a more dynamic assessment of physiological responses.

    Purpose of the Study:

    • To determine oxygen deficit and debt during progressively incremented exercise.
    • To evaluate the feasibility of incremental exercise tests for assessing anaerobic capacity.

    Main Methods:

    • Five male subjects underwent two successive incremental exercise tests to exhaustion on a cycle ergometer.
    • Oxygen deficit was calculated by comparing measured oxygen uptake to steady-state uptake at equivalent work rates.
    • The anaerobic threshold (AT) was identified using respiratory gas analysis.

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    Main Results:

    • The oxygen deficit measured before the AT during incremental exercise was smaller than that observed during steady-state exercise at low intensities.
    • The total oxygen deficit during incremental exercise could represent anaerobic capacity, within motivational limits.
    • The lactacid and alactacid components of the oxygen deficit could not be differentiated.
    • A significant portion of the alactacid component of the oxygen deficit occurred after the AT onset.

    Conclusions:

    • Incremental exercise tests can be utilized to determine the total oxygen deficit, serving as an indicator of anaerobic capacity.
    • This methodology, however, does not allow for the distinction between the lactacid and alactacid components of the oxygen deficit.
    • Further research may be needed to refine methods for differentiating these components during incremental exercise.