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A Lactate Kinetics Method for Assessing the Maximal Lactate Steady State Workload.

Gernot O Hering1, Ewald M Hennig2, Hartmut J Riehle1

  • 1Department of Sport and Health Science, University of Konstanz, Konstanz, Germany.

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Summary

Lactate threshold (LT) and maximal lactate steady state workload (MLSSW) are key exercise intensity markers. This study precisely defines their physiological range and demonstrates reliable methods for their assessment in athletes.

Keywords:
exercise physiologylactate kineticslactate thresholdmaximal lactate steady state workloadperformance testing

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biochemistry

Background:

  • The lactate threshold (LT) signifies rapid arterial lactate accumulation during incremental exercise.
  • Maximal lactate steady state workload (MLSSW) represents the highest intensity without lactate accumulation.
  • The precise physiological range and direct demonstration of LT and MLSSW remain underexplored.

Purpose of the Study:

  • To directly demonstrate the physiological range of LT and MLSSW.
  • To assess arterial lactate kinetics using minor workload variations around MLSSW.
  • To validate the reproducibility and applicability of LT determination based on MLSSW.

Main Methods:

  • Analysis of arterial lactate kinetics in 278 treadmill and 148 bicycle ergometer tests.
  • Utilizing small workload increments (0.1-0.15 m/s or 7-10 W) to identify LT.
  • Employing subsequent workload reductions to confirm MLSSW realization.

Main Results:

  • Minimal workload increases triggered a sharp rise in arterial lactate, indicating LT achievement.
  • Higher workload increments resulted in more pronounced lactate increases.
  • Workload reduction post-LT determination effectively identified MLSSW.
  • LT determined via MLSSW showed high day-to-day reproducibility (r=0.996) and validity in 10km (r=0.981) and half marathon settings (r=0.969).

Conclusions:

  • Exercise-related lactate metabolism is finely regulated.
  • Assessing lactate kinetics at MLSSW provides a reliable method for determining LT.
  • This approach offers a reproducible and valid measure for exercise intensity assessment in athletes.