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Lactate kinetics and individual anaerobic threshold
International Journal of Sports Medicine
|August 1, 1981
Summary
This study introduces a diffusion-elimination model to understand lactate kinetics during exercise and recovery. It highlights that higher aerobic capacity correlates with lower lactate levels at the individual anaerobic threshold (IAT), necessitating personalized assessments.
Area of Science:
- Exercise Physiology
- Sports Science
- Biophysics
Background:
- Exercise at increasing workloads causes a curvilinear rise in blood lactate.
- Lactate kinetics post-exercise are governed by diffusion and elimination processes.
- Understanding these kinetics is crucial for performance assessment.
Purpose of the Study:
- To present a general diffusion-elimination model for blood lactate kinetics.
- To derive key physiological parameters like maximal elimination rate (Em) and individual anaerobic threshold (IAT).
- To analyze lactate kinetics and IAT in athletes.
Main Methods:
- Development of a general diffusion-elimination model for lactate.
- Application of the model to a highly trained athlete to calculate constants and variables.
- Determination of the IAT in 61 athletes across various disciplines.
Main Results:
- The model allows calculation of parameters including Em, IAT, muscle volume above IAT (Vm), and lactate gradient (Agrad).
- Demonstrated inverse relationship between aerobic capacity and lactate concentration at IAT.
- Significant interindividual variability in IAT lactate concentration was observed.
Conclusions:
- The diffusion-elimination model provides a framework for quantifying lactate kinetics.
- Increasing aerobic fitness is associated with lower blood lactate at the IAT.
- Individualized assessment of IAT is essential due to wide interindividual variations.