Understanding VLamax: endurance type or sprinter?

What VLamax describes

VLamax is the maximal lactate production rate, expressed in mmol/L/s. It describes the rate at which glycolytic processes convert glucose to lactate. The article distinguishes endurance-oriented values below 0.3, intermediate values of 0.3–0.5 and higher values above 0.5 mmol/L/s; these categories depend on the event, rather than one universal ideal.

Why endurance athletes consider it

A high glycolytic capacity can support short, powerful efforts. For marathon and Ironman preparation, the article discusses the trade-off: greater carbohydrate use at a given intensity and a lower metabolic threshold can increase fueling demands.

Measure it with a sprint test, not a step-test estimate

The guide describes a 15-second maximal sprint with lactate measured before the effort and through recovery to capture the peak. The Mader formula relates the rise to the sprint duration. LactateThreshold’s Premium sprint calculator uses these inputs. It deliberately does not estimate VLamax from a step test, because that approach lacks validation; the German article cites Quittmann 2025.

Read the metabolic profile in context

The profile places VO2max on one axis and VLamax on the other.

• High VO2max and low VLamax: the endurance-oriented “diesel” profile
• High VO2max and high VLamax: power-endurance
• Lower VO2max and high VLamax: sprint-oriented
• Lower values on both axes: recreational profile

Match adaptation to the sport

The German guide discusses more low-intensity volume, fewer highly intense intervals and adequate sleep and recovery when an endurance athlete aims to reduce VLamax. The appropriate direction still depends on the demands of the chosen race.