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Related Experiment Videos

The ventilatory threshold gives maximal lactate steady state.

Y Yamamoto1, M Miyashita, R L Hughson

  • 1Department of Kinesiology, University of Waterloo, Ontario, Canada.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1991
PubMed
Summary

The ventilatory threshold (Thv) accurately identifies the maximal lactate steady state (MLSS) during exercise. This means Thv indicates the highest sustainable work rate without significant blood lactate accumulation, crucial for endurance performance.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • The maximal lactate steady state (MLSS) represents the highest exercise intensity sustainable without progressive blood lactate accumulation.
  • Identifying MLSS is critical for optimizing training programs and predicting endurance capacity.

Purpose of the Study:

  • To determine if the ventilatory threshold (Thv) can reliably indicate the maximal lactate steady state (MLSS).
  • To assess the highest work rate (W) at which blood lactate concentration ([la]b) remains stable during constant intensity exercise.

Main Methods:

  • Healthy male subjects performed ramp exercise tests to determine the work rate at ventilatory threshold (WThv).
  • Subjects then completed 30-minute constant intensity exercise trials at WThv and 4.9% above WThv.

Related Experiment Videos

  • Blood lactate concentrations ([la]b) were measured at 15 and 30 minutes during the constant intensity trials.

    • Main Results:

    • The ventilatory threshold (Thv) determination showed a low coefficient of variation (2.6%).
    • Exercise at WThv did not result in significant increases in blood lactate ([la]b) over 30 minutes.
    • Exercise at 4.9% above WThv led to a significant increase in [la]b from 15 to 30 minutes.

    Conclusions:

    • The ventilatory threshold (Thv) serves as a valid indicator for establishing the maximal lactate steady state (MLSS).
    • Sustained exercise at the work rate identified by Thv can be performed without continuous blood lactate accumulation.