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Improved detection of lactate threshold during exercise using a log-log transformation.

W L Beaver, K Wasserman, B J Whipp

Journal of Applied Physiology (Bethesda, Md. : 1985)

|December 1, 1985

Summary

Arterial lactate concentration ([La-]) shows threshold behavior during incremental exercise. A log-log plot reveals a distinct transition from slow to rapid increase, accurately identifying the lactate threshold.

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Commentaries.

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Area of Science:

Exercise Physiology
Biochemistry
Sports Science

Background:

Arterial lactate concentration ([La-]) is a key indicator during exercise.
Understanding the relationship between lactate and oxygen uptake (VO2) is crucial for performance analysis.

Purpose of the Study:

To investigate the pattern of arterial lactate concentration increase during incremental exercise.
To identify and accurately determine the lactate threshold using a novel log-log transformation.

Main Methods:

Utilized a log-log transformation plotting log([La-]) vs. log(VO2).
Employed linear regression analysis to identify transition points in the data.
Compared results with traditional semilog plots.

Main Results:

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The log-log plot revealed distinct linear phases of slow and rapid lactate increase.
A significant lactate threshold was identified, showing accelerated increase beyond this point.
The increase followed a power law with an exponent of approximately 2.9.

Conclusions:

The log-log transformation provides a more accurate method for determining the lactate threshold.
Arterial lactate exhibits threshold behavior, transitioning from slow to rapid increase during incremental exercise.
This finding enhances the understanding of physiological responses to exercise intensity.