Evaluating the maximal rate of lactate accumulation and estimated maximal lactate steady state in cycling

May 8, 2025European journal of applied physiology

Maximum lactate buildup and steady lactate levels during cycling

AI simplified

Circadian Biology on OpenScience ↗PubMed ↗DOI ↗

Abstract

Good reliability was found for the maximal rate of blood lactate accumulation (VLa) with an intraclass correlation coefficient of 0.80 and for calculated power output at maximal lactate steady state (cP-MLSS) with an intraclass correlation coefficient of 0.99.

cP-MLSS was calculated based on VLa and body mass.
Lactate threshold (LT) measured 277 ± 41 W while cP-MLSS measured 282 ± 43 W.
No significant difference was found between cP-MLSS and LT values.
Limits of agreement for cP-MLSS and LT were relatively wide, ranging from -39 to 29 W.
Further research is needed to validate VLa and cP-MLSS as parameters in training and performance contexts.

AI simplified

This study examined the reliability of the maximal rate of blood lactate (BLa) accumulation (VLa) and the, thereof, derived calculated power output at maximal Lasteady state (cP-MLSS). Additionally, cP-MLSS was compared with the second Lathresholds determined by experts (LT), being an accurate and often used threshold concept. 13 physically active male participants (length: 182 ± 4 cm; body mass: 76.3 ± 5.8 kg) completed a step incremental protocol to determine(60.5 ± 5.8 mL·min·kg) and LT. Additionally, a 15-s isokinetic sprint test was conducted on four separate occasions to determine VLa. cP-MLSS was calculated using a mathematical model based on VLa,and body mass. Intraclass correlation coefficients (ICC) and coefficients of variation (CV%) were used to assess reliability. A paired sample T test was used to compare cP-MLSS (mean value of the 4 test days) and LT. We found good reliability for VLa(ICC = 0.80) and excellent reliability for cP-MLSS (ICC = 0.99). Moreover, LT(277 ± 41 W) and cP-MLSS (282 ± 43 W) were not significantly different. However, comparison revealed relatively wide limits of agreement (-39 to 29 W). This study concludes that VLaand cP-MLSS are reliable measures but need further research and refinement to be used as valid parameters in training and performance contexts. ----1 -1max2-expert2-expert max max2-Expert max2-expert max V ˙ O2max V ˙ O2max

Full Text

Full text is available at the source.

View full text (PDF) ↗View full text (HTML) ↗

Evaluating the maximal rate of lactate accumulation and estimated maximal lactate steady state in cycling

Abstract

Full Text

You found one interesting study. We’ll send the next 7.

what lands in your inbox each week:

Recent issues from the circadian biology brief