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 (V80%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.

Predicting Maximal Lactate Steady State from Carminatti’s Shuttle Run Test in Soccer Players

“…The MLSS is not a practical and accessible measure, especially in team sports such as soccer, because it involves several bouts at different speeds on different days, and this modality involves a high number of athletes [9,10]. Previously, the prediction of MLSS was conducted in soccer players by using invasive procedures or multiple trials procedures [12][13][14][15][16]. Additionally, the determination of MLSS in the current study was derived from a very specific pattern of exercise, similar in nature to soccer.…”

“…The submaximal estimates of MLSS derived from T-Car incremental test were: a) Heart rate deflection point (HRDP): defined as the intensity of transition of a linear (or quasi-linear) increase of HR to an non-linear increase in the HR, the point of deflection was defined by visual inspection [18]; b) Heart rate deflection point Dmax method (HRDPDmax): calculated by a third order polynomial regression, from the HR versus speed values. The two endpoints of the curve were connected by a straight line, and the most distant point of the curve to the line was considered as the HRDPDmax, only values of HR ≥ 140 bpm were used in this analysis [19]; c) Fixed percentage of 80.4 % of sPeak (80.4 %sPeak): determined by linear interpolation between two stages at speed equivalent to 80.4 % of T-Car sPeak [5]; d) Fixed percentage of HRmax of 90 % (90 %HRmax): determined by interpolation between two stages at HR equivalent to 90 % of HRmax [16,20]; and e) Fixed percentage of HRmax of 91.4 % (91.4 %HRmax): determined by interpolation between two stages at HR equivalent to 91.4 % of HRmax [21]. Originally, the 80.4 %sPeak and 91.4%HRmax were derived from a large sample size (n = 112) as the percentages of sPeak and HRmax, respectively, equivalent to HRDPDmax using the T-Car test [21], and the 90 %HRmax was used in previous studies [16,20].…”

“…In short, the continuous MLSS determination is based on several 30-min trials performed on different days, including blood [La − ] samples [10], which makes it more impractical and not widely accessible. In an attempt to make it easier to determine MLSS with 1-day tests and/or without any invasive procedures, studies of MLSS prediction in soccer players have focused on critical speed [12], [La − ] minimum test [13], [La − ]-derived thresholds [12,14,15], and use of field incremental test parameters [16]. However, those studies determined the MLSS during continuous exercise models (pauses only for [La -] sample) [12][13][14][15][16], which is not in accordance with the specificity regarding the intermittent character of soccer.…”

Considerations regarding Maximal Lactate Steady State determination before redefining the gold‐standard

“…Notwithstanding this statement was not evidence-supported. It seems therefore worth mentioning that the review overlooked studies where MLSSint was determined with a precision of 0.2-0.35 km h −1 without exceeding the typical number of trials required for MLSSint determination (Garcia-Tabar & Gorostiaga, 2018;Llodio, Garcia-Tabar, Sánchez-Medina, Ibáñez, & Gorostiaga, 2015;Llodio, Gorostiaga, Garcia-Tabar, Granados, & Sánchez-Medina, 2016). Moreover these studies demonstrated that 1-2 tests are enough to precisely estimate the MLSSint.…”

Промена На Крвните Лактати При Ергометриско Тестирање Кај Професионални Фудбалери За Време На Една Натпреварувачка Полусезона

“…Тие нашле дека испитувањето на анаеробниот праг во споменатите услови може да ги утврди субмаксималните физиолошки варијабли кај млади фудбалери. [11]. Се покажа дека испитувањето на оваа варијабла може да помогне во процесот на тренирање кај младите фудбалери.…”