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Related Experiment Videos

Continuous increase in blood lactate concentration during different ramp exercise protocols.

M E Campbell1, R L Hughson, H J Green

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

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 1, 1989
PubMed
Summary

A continuous model accurately describes blood lactate concentration (La-) versus oxygen uptake (VO2) during exercise. This model outperforms the log-log model, especially at higher intensities, indicating a continuous relationship between La- and VO2.

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Area of Science:

  • Exercise Physiology
  • Biophysics
  • Sports Science

Background:

  • The relationship between blood lactate concentration ([La-]) and oxygen uptake (VO2) is crucial for understanding exercise physiology.
  • Previous models, such as the log-log transformation, have been used to describe this relationship.
  • The accuracy and physiological relevance of different modeling approaches require further investigation.

Purpose of the Study:

  • To evaluate the applicability of a continuous exponential model for describing the [La-] vs. VO2 relationship.
  • To compare the continuous model with a previously proposed log-log transformation model.
  • To assess the influence of different ramp exercise intensities on this relationship.

Main Methods:

  • Nine healthy male volunteers performed ramp exercise protocols with work rates increasing at 8, 15, or 50 W/min.

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  • A continuous model ([La-] = â + b exp(ĉVO2)) was statistically compared to a log-log transformation model.
  • Analysis of variance and paired t-tests were used to compare model errors.

    • Main Results:

    • The continuous model demonstrated significantly lower mean square errors compared to the log-log model across all ramp slopes (P < 0.01).
    • The log-log model's error increased significantly at or above the lactate threshold.
    • The lactate slope index (d[La-]/dVO2 = 1) occurred at higher VO2 values with increasing ramp slopes (P < 0.05).

    Conclusions:

    • Blood lactate concentration increases as a continuous function of oxygen uptake across various exercise intensities.
    • The continuous exponential model provides a more accurate and potentially more physiologically relevant description of the [La-] vs. VO2 relationship than the log-log model.
    • The findings support the use of continuous modeling for analyzing metabolic responses during exercise.