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Prediction of lactate threshold using the modified Conconi test in distance runners
M Kjertakov1, M Dalip2, R Hristovski3
1Independent Researcher.
Physiology International
|June 23, 2017
Summary
The modified Conconi test (CT) can predict lactate threshold (LT) in distance runners by identifying the heart rate deflection point (HRDP). This test offers a valid alternative for assessing LT when a clear HRDP is observed.
Area of Science:
- Exercise Physiology
- Sports Science
- Biotechnology
Background:
- Lactate threshold (LT) is a critical physiological marker for endurance performance in distance runners.
- Accurate LT assessment is essential for effective training program design.
- The modified Conconi test (CT) is a field test proposed to estimate LT non-invasively.
Purpose of the Study:
- To evaluate the validity of the modified Conconi test (CT) in predicting the lactate threshold (LT) in distance runners.
- To compare physiological markers (heart rate, running speed) at the heart rate deflection point (HRDP) from the CT with those determined during an incremental test.
- To assess the attainment of a steady state during prolonged exercise at speeds derived from the CT.
Main Methods:
- Twelve distance runners participated, performing both the modified CT and a direct incremental test with blood lactate (BLa) measurements.
- Heart rate (HR) and running speed (RS) at the HRDP in the CT were compared to LT markers.
- A 30-min prolonged exercise test (PET) was conducted at the CT-derived speed to analyze BLa and HR kinetics for steady-state achievement.
Main Results:
- The HRDP was identified in nine out of twelve runners; three showed a linear HR response.
- No significant differences were found between HR and RS at HRDP and LT in the nine identified runners.
- Significant correlation was observed between HR at HRDP and HR at LT (r=0.84, p=0.005), but not for RS (r=0.63, p=0.07).
Conclusions:
- The modified Conconi test (CT) demonstrates potential as a valid alternative method for assessing lactate threshold (LT) in distance runners who exhibit a discernible heart rate deflection point (HRDP).
- The test's ability to predict LT is supported by comparable heart rate values, although running speed correlation requires further investigation.
- The successful completion of prolonged exercise tests at CT-derived speeds, achieving steady-state conditions, further validates the modified CT's applicability.
