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Methods for estimating the maximal lactate steady state in trained cyclists.

C R Harnish1, T C Swensen, R R Pate

  • 1Department of Exercise Science, School of Public Health, University of South Carolina, Columbia, SC, USA. crharnish@earthlink.net

Medicine and Science in Sports and Exercise
|June 19, 2001
PubMed
Summary

Cyclists can estimate their maximal lactate steady state (MLSS) speed using either a 5-km or 40-km time trial. Both tests provide valid estimates of MLSS intensity in trained cyclists.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biochemistry

Background:

  • Maximal lactate steady state (MLSS) is a key indicator of endurance performance in cyclists.
  • Accurate estimation of MLSS is crucial for effective training program design.
  • Current methods for determining MLSS can be time-consuming and require extensive laboratory testing.

Purpose of the Study:

  • To assess the validity of simulated 5-km and 40-km time trials (TT) for estimating the average speed at MLSS in cyclists.
  • To compare the physiological responses during TTs with those at MLSS.

Main Methods:

  • Nine trained cyclists completed a VO2max test, simulated 5-km and 40-km TTs, and multiple 30-minute MLSS trials.
  • Physiological parameters including oxygen consumption (VO2), heart rate (HR), and blood lactate concentration (HLa) were measured.

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Main Results:

  • MLSS speed was 36.8 ± 1.0 km/h, representing 80.1% of VO2peak.
  • Average speed during the 40-km TT (36.6 ± 0.9 km/h) did not differ significantly from MLSS speed.
  • The 5-km TT average speed was approximately 92.1% of MLSS speed, indicating a strong correlation.

Conclusions:

  • Both simulated 5-km and 40-km time trials are valid and practical methods for estimating MLSS in trained cyclists.
  • Individual variation in blood lactate at MLSS suggests personalized assessment is important.
  • These findings offer a more accessible approach to determining optimal training intensities.