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Comparative lactate kinetics after short and prolonged submaximal exercise.

H Freund1, S Oyono-Enguéllé, A Heitz

  • 1Laboratoire de Pharmacologie Cellulaire et Moléculaire, Université Louis Pasteur Strasbourg, Illkirch-Graffenstaden, France.

International Journal of Sports Medicine
|August 1, 1990
PubMed
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Prolonged exercise impairs lactate removal. Extending cycling from 3 to 60 minutes significantly slowed the body's ability to clear lactate during recovery, impacting athletic performance.

Area of Science:

  • Exercise Physiology
  • Biochemistry
  • Sports Science

Background:

  • Lactate accumulation during exercise is a key factor in fatigue.
  • Understanding lactate kinetics during recovery is crucial for optimizing training and performance.

Purpose of the Study:

  • To investigate the effect of exercise duration on arterial blood lactate concentrations during and after cycling exercise.
  • To determine if the two-compartment model of lactate kinetics applies to prolonged exercise recovery.

Main Methods:

  • Arterial blood lactate levels were measured in two groups of male subjects (n=11 each) before, during, and after cycling exercise at 2 W.kg-1 body mass.
  • Exercise durations were 3 minutes for one group and 60 minutes for the second group.
  • Lactate recovery curves were analyzed using a bi-exponential time function to determine velocity constants.

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Main Results:

  • Lactate recovery curves followed a bi-exponential pattern (rapid increase, slow decrease) in both short and prolonged exercise groups.
  • Prolonged exercise (60 min) significantly decreased both velocity constants of the lactate recovery curve compared to short exercise (3 min).
  • The decrease in the slow component velocity constant was statistically significant (28%), indicating impaired lactate clearance after extended exercise.

Conclusions:

  • The two-compartment model for lactate kinetics is applicable to recovery from prolonged exercise.
  • Extended exercise duration (60 min vs. 3 min) significantly impairs the body's capacity to remove lactate post-exercise.
  • These findings suggest that training adaptations may be necessary to improve lactate metabolism following prolonged strenuous activity.