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Variations in lactate apparent clearance during rest and exercise in normal man
M A Francaux1, P A Jacqmin, X G Sturbois
1Physical Education Unit, Faculty of Medecine, University of Louvain, Belgium.
Archives Internationales De Physiologie, De Biochimie Et De Biophysique
|September 1, 1993
Summary
A new kinetic model reveals blood lactate concentration alone is a poor indicator of lactate production. Lactate production linearly correlates with exercise intensity, while clearance decreases significantly during high-intensity recovery.
Area of Science:
- Exercise Physiology
- Biokinetics
- Metabolic Research
Background:
- Lactate metabolism is crucial for understanding exercise physiology.
- Traditional methods often rely on blood lactate concentration, which may not fully represent metabolic processes.
- A more refined approach is needed to accurately study lactate kinetics.
Purpose of the Study:
- To introduce a simple kinetic model for analyzing lactate metabolism.
- To investigate lactate metabolism without requiring labeled molecules, based on pharmacokinetic principles.
- To compare lactate metabolism during different recovery intensities following intensive exercise.
Main Methods:
- Developed a kinetic model based on pharmacokinetic theory.
- Studied six male subjects undergoing intensive exercise followed by passive recovery (RE), moderate exercise (ME), and heavy exercise (HE).
- Measured blood lactate concentration before exercise and during the first hour of recovery.
Main Results:
- Apparent lactate clearance increased significantly from RE to ME (2.83-fold) and RE to HE (1.96-fold).
- Steady-state blood lactate concentration (La(ss)) increased moderately from RE to ME and markedly during HE.
- Apparent lactate production (F"K0) increased linearly with exercise recovery intensity.
Conclusions:
- Blood lactate concentration is not a precise indicator of lactate production in humans.
- Apparent lactate production is a linear function of exercise intensity.
- High-intensity exercise recovery leads to increased blood lactate due to decreased apparent clearance.