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Oxygen uptake kinetics during exercise.

F Xu1, E C Rhodes

  • 1School of Human Kinetics, University of British Columbia, Vancouver, Canada.

Sports Medicine (Auckland, N.Z.)
|June 16, 1999
PubMed
Summary
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Oxygen uptake (VO2) kinetics vary with exercise intensity. Below the lactate threshold (LT), VO2 response is linear, but above LT, a slow component emerges, influenced by factors like muscle recruitment and training.

Area of Science:

  • Exercise Physiology
  • Human Physiology
  • Sports Science

Background:

  • Oxygen uptake (VO2) kinetics describe how oxygen consumption changes during exercise.
  • VO2 kinetics exhibit distinct patterns below and above the lactate threshold (LT).
  • Factors like training, age, and health status can modify VO2 responses.

Purpose of the Study:

  • To elucidate the characteristics and control mechanisms of VO2 kinetics during exercise.
  • To investigate the factors contributing to the slow component of VO2 during heavy exercise.
  • To explore the impact of physical training on VO2 kinetics.

Main Methods:

  • Analysis of VO2 responses at different exercise intensities (below and above LT).
  • Examination of factors influencing VO2 kinetics, including oxygen delivery and utilization.

Related Experiment Videos

  • Investigation of the slow component of VO2 during heavy exercise and its potential causes.

    • Main Results:

    • Below LT, VO2 kinetics show a linear relationship with work rate.
    • Above LT, a complex VO2 response emerges with a slow component.
    • Potential causes for the slow component include increased lactate, epinephrine, and type IIb fiber recruitment.

    Conclusions:

    • The control mechanism of VO2 kinetics remains debated, with hypotheses focusing on oxygen delivery versus utilization.
    • The slow component of VO2 during heavy exercise is largely attributed to the exercising muscles, particularly type IIb fibers.
    • Physical training can reduce the slow component by altering motor unit recruitment patterns.