The main conclusion of the study was that the variation in the dimensions of the pitch caused a non-linear variation in the behavioural and conditional response in teams and players. On a conditional level, the values showed differences between the three formats studied, showing more similarities between LSG50 and LSG100 than with LSG75. The entropy was higher in SSG50 > LSG75 > LSG100. There was a moderate increase in DC and W2 (LSG50 > LSG75) and a moderate decrease in SI2, CH2, SI, L and CH (LSG75 > LSG50). The results showed small (LSG100 > LSG75) and moderate–long differences (LSG100 > LSG50) for CH, SI and L. The physical variables were: maximum speed (Vmax), number of accelerations (Acc) and decelerations (Dec) and total distance (TD). ![]() The inter-team variables were calculated by using the 20 outfield players: CH2, W2, L2, L/W2 and DC (distance between centroids). The intra-team variables were: convex hull (CH), stretch index (SI), width (W), length (L) and length/width (L/W). The aim of this study was to describe the effects on collective behaviour and the physical response of young elite football players (Under 15) in the same 11 versus 11 task in three different pitch lengths (100, 75 and 50 m, LSG100, LSG75 and LSG50, respectively), keeping the width constant (60 m). Soccer coaches can use such SSGs for an optimal tactical match preparation. Match-derived RPA in SSGs facilitates the tactical representativeness for the match. 4 + GKs than the match in under-13, under-15, and under-17. Subgroup analyses revealed similar team distances in matches and SSGs with the exception of larger interpersonal distances in 4 vs. Results demonstrated that in each age category, with an increase in number of players, team distances increased and tactical variability decreased. Corresponding tactical variability (coefficients of variation expressed as percentages) was determined for all players. Positional data were collected to calculate tactical variables (interpersonal distances, length, width, and surface areas) for all players and for 2- and 4-player subgroups. ![]() Soccer teams in 4 age categories (under-13, under-15, under-17, and under-19) played official matches and 4 vs. Therefore, this study aims to investigate tactical demands of matches and various SSGs-with a different number of players and played on 320 m2 RPA-in talented youth soccer players. In addition, subgroup analysis is necessary to deal with the different number of players in match and SSGs. To create a more precise replication of tactical match demands in SSGs with less than 11 players per team, a match-derived RPA (320 m2) may be considered because this affords a similar playing area per player. Typically, SSGs are played on a smaller relative pitch area (RPA i.e., ,150 m2) than the match (320 m2 RPA), which results in different tactical demands. Replicate (situations of) the official match across all age groups. Small-sided games (SSGs) are a promising training format in soccer to
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