Using lactate threshold to predict 5-km treadmill running performance in veteran athletes

Area of Science:

• Exercise Physiology
• Sports Science
• Biochemistry

Background:

• Assessing endurance performance in veteran athletes is challenging due to age-related decreases in lactate concentration.
• Traditional lactate threshold methods may be less reliable in older populations.

Purpose of the Study:

• To evaluate the validity of the maximal deviation (Dmax) method for determining lactate threshold.
• To compare Dmax with other lactate threshold methods for predicting 5-km running performance in veteran athletes.

Main Methods:

• Veteran runners (36 total) underwent incremental exercise tests to determine lactate threshold using Dmax, log-log, visual, and 4-mmol/L methods.
• Participants completed a 5-km treadmill time trial on a separate occasion.
• Statistical analyses included correlation and Bland-Altman plots to assess agreement.

Main Results:

• Mean treadmill velocity at Dmax was not significantly different from 5-km time trial velocity (12.2 vs. 12.1 km/h).
• Dmax showed a strong correlation (r=0.92) and narrow limits of agreement with 5-km performance.
• Other methods exhibited weaker correlations and wider limits of agreement.

Conclusions:

• The Dmax method provides a valid measure of lactate threshold for predicting 5-km running performance in veteran athletes.
• Dmax is a reliable alternative to traditional methods, unaffected by age-related changes in lactate concentration.
• This method can be effectively applied to both male and female veteran runners.