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Reliability of maximal lactate-steady-state.

T Hauser¹, D Bartsch, L Baumgärtel

¹Sportsmedicine/-biology, Chemnitz University of Technology, Chemnitz, Germany. thomas.hauser@s2002.tuchemnitz.de

International Journal of Sports Medicine

|September 14, 2012

Summary

Power (PMLSS) and heart rate (HRMLSS) at maximal lactate steady-state (MLSS) demonstrate reliable day-to-day performance in cyclists. Blood lactate concentration (BLCMLSS) at MLSS shows higher variability.

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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.
Understanding the reliability of physiological markers at MLSS is crucial for training.
Previous research has explored various lactate threshold concepts.

Purpose of the Study:

To analyze the day-to-day reliability and variability of power (PMLSS), blood lactate concentration (BLCMLSS), and heart rate (HRMLSS) at MLSS.
To determine the consistency of these physiological measures over time in male cyclists.

Main Methods:

32 male subjects performed constant-load tests for 30 minutes to determine 4 PMLSS.
Blood lactate concentration (BLCMLSS) was measured at multiple time points during each test.
Power (PMLSS), BLCMLSS, and heart rate (HRMLSS) were recorded, and coefficients of variability (CV) and Intra-Class Coefficients (ICC) were calculated.

Main Results:

Mean PMLSS was 244±45 W (75% VO2max), with a low CV of 3% and high ICC of 0.98.
Mean HRMLSS was 166±10 bpm, showing a CV of 6.3% and ICC of 0.92.
Mean BLCMLSS was 5.3±1.5 mmol/l, exhibiting a higher CV of 16.6% and ICC of 0.71.

Conclusions:

PMLSS and HRMLSS are reliable and consistent measures for assessing MLSS in cyclists.
BLCMLSS demonstrates greater day-to-day variability compared to PMLSS and HRMLSS.
These findings support the use of PMLSS and HRMLSS for monitoring training adaptations in endurance athletes.