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Comparison of objective methods for determining ventilatory threshold.

Y Fukuba1, M Munaka, S Usui

  • 1Department of Biometrics, Hiroshima University, Japan.

The Japanese Journal of Physiology
|January 1, 1988
PubMed
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This study found that the ventilatory threshold (VT), determined by the ratio of ventilation to oxygen uptake (VE/VO2), closely estimates the lactate threshold (LT) in young men during cycle exercise. This objective method offers a reliable way to assess exercise intensity.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biomedical Engineering

Background:

  • The lactate threshold (LT) and ventilatory threshold (VT) are key indicators of exercise intensity and endurance performance.
  • Accurate determination of these thresholds is crucial for exercise prescription and physiological assessment.
  • Previous methods for determining VT have varied, leading to potential inconsistencies in its relationship with LT.

Purpose of the Study:

  • To compare and re-examine the relationship between lactate threshold (LT) and ventilatory threshold (VT).
  • To evaluate six objective methods for determining VT.
  • To establish the reliability of objective VT determination for estimating LT.

Main Methods:

  • Twenty-one young male subjects performed incremental cycle ergometer tests to volitional fatigue.

Related Experiment Videos

  • Gas exchange parameters (VE, VO2) were measured continuously, and blood lactate concentrations were determined at each work rate.
  • Six objective methods were used to determine VT, focusing on non-linear increases in VE and VE/VO2.

    • Main Results:

    • Objective VT determination methods based on the minimum value of VE/VO2 showed high consistency with LT.
    • For 16-20 out of 21 subjects, VT was within +/- 0.2 L/min of VO2 compared to LT.
    • VE/VO2 was identified as a more sensitive index for detecting VT than VE.

    Conclusions:

    • The objective VT determination method using the minimum VE/VO2 is a reliable and sensitive approach.
    • This method can facilitate the estimation of LT within an error of +/- 0.2 L/min VO2 in most individuals.
    • Objective VT assessment provides a practical tool for estimating LT in exercise physiology research and practice.