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The reliability of lactate measurements during exercise
1Department of Exercise Science, University of Massachusetts, Amherst 01003, USA.
International Journal of Sports Medicine
|August 28, 1998
Summary
Lactate threshold (LT) measurements for velocity, oxygen consumption, and heart rate are highly reliable across multiple testing days in endurance athletes. This indicates consistent and dependable physiological data for training and performance analysis.
Area of Science:
- Exercise Physiology
- Sports Science
- Biochemistry
Background:
- Lactate threshold (LT) is a key indicator of endurance performance.
- Reliable measurement of LT is crucial for effective training prescription.
- Previous studies have shown variability in LT measurement methods.
Purpose of the Study:
- To determine the day-to-day reliability of lactate threshold (LT) measurements.
- To assess the reliability of LT determined by various criteria and measures.
- To establish the consistency of LT(VEL), LT(VO2), and LT(HR) across repeated testing sessions.
Main Methods:
- Twelve endurance-trained males underwent three separate days of treadmill testing.
- Blood lactate concentration was measured at incremental exercise intensities (60-89% VO2max).
- LT was determined using fixed lactate concentrations (2.0, 2.5, 4.0 mmol), breakpoint analysis, and baseline increments, assessing velocity (LT(VEL)), VO2 (LT(VO2)), and HR (LT(HR)).
Main Results:
- High intraclass correlation coefficients (ICCs) were observed for all LT measures.
- LT(VEL) demonstrated excellent reliability (ICCs 0.98-0.99).
- LT(VO2) (ICCs 0.91-0.96) and LT(HR) (ICCs 0.75-0.96) also showed strong reliability.
Conclusions:
- Lactate threshold measurements, including velocity, oxygen consumption, and heart rate, are reliable across repeated testing days.
- The findings support the use of these LT measures for consistent physiological assessment in endurance athletes.
- These reliable LT metrics can inform training program development and performance monitoring.
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