Track and Treadmill Lactate Assessments Are Not Interchangeable for Training Prescription in Elite Distance Runners

Area of Science:

• Exercise Physiology
• Sports Biomechanics
• Running Performance Analysis

Background:

• Understanding physiological and biomechanical differences between track and treadmill running is crucial for accurate training prescription in elite distance runners.
• Previous research has not fully elucidated these differences at race-relevant intensities.

Purpose of the Study:

• To characterize and compare physiological (blood lactate) and biomechanical (ground contact time) parameters during track versus treadmill running in elite distance runners.
• To assess the predictive validity of track and treadmill running assessments for 10,000m race performance.

Main Methods:

• Nine elite male distance runners completed incremental exercise tests on a 300-m track and a motorized treadmill.
• Blood lactate concentration and running velocity were measured at each stage.
• Ground contact time was analyzed at higher intensities.

Main Results:

• Blood lactate concentration was significantly higher on the track across all stages, with the difference increasing progressively.
• Running velocities at fixed blood lactate concentrations (4 and 6 mmol·L⁻¹) were lower during track running.
• Track-based velocity at 6 mmol·L⁻¹ showed superior predictive validity for 10,000m performance compared to treadmill assessment.

Conclusions:

• Track and treadmill lactate assessments are not interchangeable for training prescription.
• Track-based assessments should be prioritized when feasible due to higher predictive validity.
• Practitioners should adjust prescribed velocities by approximately 7-8 s·km⁻¹ when transferring training zones between track and treadmill, with adjustments being speed-dependent.