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Related Experiment Videos

Effect of incremental test protocol on the lactate minimum speed.

H Carter1, A M Jones, J H Doust

  • 1Chelsea School Research Centre, University of Brighton, Eastbourne, East Sussex, United Kingdom.

Medicine and Science in Sports and Exercise
|June 23, 1999
PubMed
Summary

The lactate minimum speed (LMS) test is not a valid method for estimating lactate threshold (LT). The test results are significantly influenced by the initial running speed (RS) used in the incremental phase.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biochemistry

Background:

  • The lactate minimum test (LMT) is used to determine the lactate minimum speed (LMS), a physiological marker.
  • Accurate determination of LMS is crucial for effective endurance training prescription.
  • The influence of initial running speed (RS) on LMS has not been thoroughly investigated.

Purpose of the Study:

  • To investigate how altering the initial running speed (RS) in the incremental phase of the lactate minimum test affects the determined lactate minimum speed (LMS).

Main Methods:

  • Eight well-trained endurance runners performed incremental treadmill tests with varying initial running speeds.
  • Blood lactate concentrations were measured at each stage until volitional fatigue.
  • Lactate minimum speed (LMS) was determined using spline function analysis.

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Main Results:

  • Lactate minimum speed (LMS) could not be determined at the two highest initial running speeds (RS).
  • LMS varied significantly based on the initial RS, ranging from 13.8 km/h to 15.8 km/h.
  • LMS differed significantly from the lactate threshold (LT) speed, except when the test began at 1.0 or 1.5 km/h below the LT speed.

Conclusions:

  • The lactate minimum speed (LMS) test is not a valid method for estimating the lactate threshold (LT).
  • The test's outcome is heavily influenced by the chosen starting speed for the incremental exercise.
  • Further research is needed to validate or refine the lactate minimum test protocol.