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Lactate removal ability and graded exercise in humans.
S Oyono-Enguelle1, J Marbach, A Heitz
1Laboratoire de Physiologie Appliquée, Groupe de Recherche Activités Physiques et Sportives, Strasbourg, France.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 1, 1990
Summary
Athletes with higher lactate removal capacity during exercise recovery can achieve higher work rates before blood lactate increases significantly. This enhanced lactate clearance is key to performance in trained individuals.
Area of Science:
- Exercise Physiology
- Sports Science
- Biochemistry
Background:
- Lactate accumulation during exercise is a key factor limiting performance.
- Understanding lactate kinetics during graded exercise is crucial for athletic training.
Purpose of the Study:
- To investigate the relationship between lactate removal during recovery and exercise intensity in athletes.
- To analyze lactate concentration dynamics during graded exercise and recovery.
Main Methods:
- Continuous monitoring of venous lactate concentrations every 5 seconds in nine athletes during graded exercise.
- Application of a continuous model to fit lactate concentration vs. work rate data.
- Analysis of recovery lactate time courses using a sum of two exponential functions.
Main Results:
- The continuous model accurately described individual lactate concentration curves during exercise.
- Lactate recovery followed a biexponential decay pattern.
- A higher lactate removal rate (gamma 2 nu) correlated with reaching higher work rates before lactate accumulation and with a slower rate of lactate increase during exercise.
Conclusions:
- Enhanced lactate removal capacity during recovery is associated with the ability to sustain higher work rates during graded exercise.
- Lactate removal plays a significant role in modulating blood lactate levels during exercise.
- These findings have implications for training strategies aimed at improving endurance performance.