Estimation of the Maximal Lactate Steady State in Junior Soccer Players

Abstract

This study aimed to predict the velocity corresponding to the maximal lactate steady state (MLSS_V) from non-invasive variables obtained during an incremental maximal running test (University of Montreal Track Test, UMTT) and to determine whether a single constant velocity test (CVT), performed several days after the UMTT, could estimate the MLSS_V. During a period of 3 weeks, 20 male junior soccer players performed: 1) a UMTT, and 2) several 20-min CVTs to determine MLSS_V to a precision of 0.35 km·h⁻¹. Maximal aerobic velocity (MAV) and velocity at 80% of maximum heart rate (V_80%HRmax) were strong predictors of MLSS_V. A regression equation was obtained: MLSS_V=(1.106·MAV) – (0.309·V_80%HRmax) – 3.024; R²=0.60. Running velocity during CVT (V_CVT) and blood lactate at 10 (La₁₀) and 20 (La₂₀) minutes further improved the MLSS_V prediction: MLSS_V=V_CVT+0.26 – (0.812·ΔLa_20–10); R²=0.66. MLSS_V can be estimated from MAV and V_80%HRmax during a single incremental maximal running test among a homogeneous group of soccer players. This estimation can be improved by performing an additional CVT. In terms of accuracy, simplicity and cost-effectiveness, the reported regression equations can be used for the assessment and training prescription of endurance in team sport players.

Key words

physical fitness - endurance training - anaerobic threshold - lactate threshold - team sports

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