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Related Experiment Videos

Relationship between the lactate and ventilatory thresholds during prolonged exercise

C E Loat1, E C Rhodes

  • 1J.M. Buchanan Exercise Science Laboratory School of Physical Education and Recreation, University of British Columbia, Vancouver, Canada.

Sports Medicine (Auckland, N.Z.)
|February 1, 1993
PubMed
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The relationship between blood lactate and ventilatory thresholds is unclear. Individual anaerobic threshold and ventilatory threshold are key for endurance performance, but assessment methods vary.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biochemistry

Background:

  • The anaerobic threshold is crucial for endurance performance and is assessed via blood lactate (lactate threshold) or ventilatory gases (ventilatory threshold).
  • The relationship between these two methods is not fully understood, with varying definitions for lactate threshold (fixed, variable, or individual anaerobic threshold).
  • Ventilatory threshold assessment uses diverse parameters, and its direct causal link to blood lactate accumulation is debated, supported by evidence from McArdle's disease patients.

Purpose of the Study:

  • To explore the relationship between blood lactate and ventilatory measures of anaerobic threshold.
  • To examine the role of different anaerobic threshold assessment methods in predicting endurance performance.
  • To highlight the importance of considering individual responses in interpreting anaerobic threshold data.

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Main Methods:

  • Review of existing literature on lactate threshold and ventilatory threshold measurement techniques.
  • Analysis of studies correlating anaerobic threshold measures with endurance performance outcomes.
  • Examination of evidence regarding the physiological underpinnings of the ventilatory response during exercise.

Main Results:

  • The correlation between lactate threshold and ventilatory threshold is inconclusive.
  • Both individual anaerobic threshold and ventilatory threshold show strong correlations with endurance performance across various distances.
  • Evidence suggests ventilatory responses may occur independently of significant lactate accumulation in certain conditions.

Conclusions:

  • Caution is advised when interpreting anaerobic threshold data due to diverse assessment protocols and individual variability.
  • The individual anaerobic threshold is proposed as a key indicator of maximal sustainable exercise intensity for endurance.
  • Further research is needed to clarify the precise relationship between lactate accumulation and ventilatory responses during exercise.