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Related Experiment Video

Updated: Mar 9, 2026

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The oxygen uptake threshold during incremental exercise test.

Anton Usaj1, Franc Kandare2

  • 1Faculty of Sport, University of Ljubljana, Gortanova 22, 1000 Ljubljana, Slovenia, Slovenia.

Pflugers Archiv : European Journal of Physiology
|December 24, 2016
PubMed
Summary
This summary is machine-generated.

The oxygen uptake threshold (OUT) is a new, simple method to identify 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).

Keywords:
Key words oxygen uptakekineticsthreshold

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Area of Science:

  • Exercise Physiology
  • Human Performance
  • Cardiorespiratory Fitness

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, but methods to identify it are complex.
  • This study introduces a simpler method to identify this non-linear phenomenon.

Purpose of the Study:

  • To ascertain if a non-linear increase in Vo2, termed oxygen uptake threshold (OUT), can be identified using a simple two-line method.
  • To test the hypothesis that the non-linear Vo2 increase results from oxygen drift during higher intensity exercise.
  • To compare the power output at OUT with the lactate threshold (LT).

Main Methods:

  • Six cyclists performed an incremental exercise test on a cycloergometer.
  • Lactate threshold (LT) was determined using the intersection of two best-fitting lines in a log-log plot of lactate concentration versus power.
  • The time course of Vo2 during each exercise step was analyzed using an exponential rise to maximum model to detect oxygen drift.

Main Results:

  • The oxygen uptake threshold (OUT) was determined in 5 out of 6 subjects.
  • The lactate threshold (LT) was determined in all 6 subjects.
  • Power output at OUT (168 ± 13 W) was similar to that at LT (180 ± 25 W).
  • Vo2 showed steady values at low intensities but increased continuously (oxygen drift) at intensities above LT and OUT.

Conclusions:

  • The oxygen uptake threshold (OUT) is a realistic phenomenon identifiable with a simple method.
  • OUT is associated with continuous oxygen drift occurring at exercise intensities above the lactate threshold.
  • This finding provides a simpler approach to understanding non-linear Vo2 kinetics during exercise.