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Related Experiment Videos

The oxygen uptake threshold during incremental exercise test.

A Usaj1, F Kandare

  • 1Faculty of Sport, University of Ljubljana, Slovenia.

Pflugers Archiv : European Journal of Physiology
|September 27, 2000
PubMed
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A new simple method identified the oxygen uptake threshold (OUT), a non-linear increase in oxygen consumption (VO2) during incremental exercise. This phenomenon, linked to oxygen drift, occurs at higher exercise intensities above the lactate threshold (LT).

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • The relationship between oxygen consumption (VO2) and exercise intensity is typically linear during incremental exercise.
  • Recent studies suggest a non-linear increase in VO2, termed the oxygen uptake threshold (OUT), using complex methodologies.
  • The underlying mechanism of this non-linear VO2 increase requires further investigation.

Purpose of the Study:

  • To determine if the oxygen uptake threshold (OUT) can be identified using a simpler method involving two best-fitting lines.
  • To test the hypothesis that a non-linear VO2 increase results from continuous oxygen drift during higher intensity exercise.
  • To compare the power output at the OUT with the power output at the lactate threshold (LT).

Main Methods:

Related Experiment Videos

  • Six cyclists performed incremental exercise tests on a cyclo-ergometer.
  • The lactate threshold (LT) was determined using the intersection of two best-fitting lines in a log-log plot of lactate concentration versus power.
  • The oxygen uptake threshold (OUT) was assessed using a similar two-line fitting method on VO2 data, and the VO2 time course during each exercise step was analyzed.

    • Main Results:

    • The oxygen uptake threshold (OUT) was identified in five out of six subjects.
    • The lactate threshold (LT) was identified in all six subjects.
    • Power output at OUT (168 ± 13 W) was comparable to that at LT (180 ± 25 W), with observed oxygen drift above both thresholds.

    Conclusions:

    • The oxygen uptake threshold (OUT) is a discernible phenomenon during incremental exercise.
    • A simple two-line method can effectively identify the OUT.
    • The OUT is associated with continuous oxygen drift occurring at exercise intensities above the lactate threshold.