Differences in the Offensive and Defensive Actions of the Goalkeepers at Women's FIFA World Cup 2011.

The aim of this study was to analyze the technical and tactical offensive and defensive actions of the goalkeepers and to determine the relationship between these actions and the qualifying results of their respective teams. The sample studied is made up of the goalkeepers (n = 20) of the senior national teams that participated in the FIFA Women's World Cup in Germany 2011. A descriptive analysis was developed comparing the offensive and defensive actions in competition carried out by the goalkeepers on qualified teams (pass the group stage) with the goalkeepers on unclassified teams (not pass the group stage). For the inter-group comparison, the value of the coefficient of variation was incorporated and the effect size calculated. All data were treated with a statistical significance level of p < 0.05. The results show that the goalkeepers on qualified teams have higher offensive registers, as well as a higher number of passes successfully completed in different areas of the field. The goalkeepers on unclassified teams show higher defensive records such as saves inside the area, foot stops and wrong clearances among others.

Game Demands of Seven-A-Side Soccer in Young Players.

Barbero-Alvarez, JC, Gómez-López, M, Castagna, C, Barbero-Alvarez, V, Romero, DV, Blanchfield, AW, and Nakamura, FY. Game demands of seven-a-side soccer in young players. J Strength Cond Res 31(7): 1771-1779, 2017-The aim of this study was to examine the activity patterns and physiological demands of 7-a-side youth soccer matches across 2 chronological age categories (U12 and U14). Twenty-two soccer players of a national youth soccer academy were investigated. Players of each age category performed 2 training matches (2 × 25 minutes) and were monitored by global positioning system and heart rate monitor units. Players of both categories covered similar total distance (5,348 ± 307 m), at similar mean heart rate values (86 ± 4% of maximum). However, the number of high-intensity runs (82.5 ± 17.4 vs. 69.7 ± 15.2) and total distance covered during sprints (264 ± 207 vs. 128 ± 74 m) were significantly (p ≤ 0.05) higher in U14 compared with U12. The results suggest a highly demanding nature of 7-a-side soccer for skilled players, with physical maturity possibly influencing the match-related high-intensity performance at these ages.

The Influence of Referee Bias on Extra Time in Elite Soccer Matches.

Referees have discretion over the addition of extra time at the end of the soccer game to compensate for lost time due to unusual stoppages. This study assesses if referees favor big teams by shortening close games where the big team is ahead and lengthening close games where the big team is behind. The sample comprises all 380 matches in the Spanish La Liga during the 2014-2015 season. The dependent variable was the extra time the referee decides to add to the second half. The independent variables were the score difference, opponent team's level of play, yellow cards, red cards, player substitutions, average attendance, and fouls committed. Linear regression analysis suggested that the greater the score difference between teams, the less extra time was added by the referee. However, in close games, referees tended to add more time for a higher level team when they were behind and add less time when they were ahead. Red cards and the number of fouls committed increased the extra time.

Physical and Physiological Responses of Amateur Football Players on Third-Generation Artificial Turf Systems During Simulated Game Situations.

Sánchez-Sánchez, J, García-Unanue, J, Felipe, JL, Jiménez-Reyes, P, Viejo-Romero, D, Gómez-López, M, Hernando, E, Burillo, P, and Gallardo, L. Physical and physiological responses of amateur football players on third generation artificial turf systems during simulated game situations. J Strength Cond Res 30(11): 3165-3177, 2016-The aim of this study is to evaluate the physical and physiological load imposed on amateur football players in a simulated game situation on different artificial turf systems. For that purpose, 20 football players (21.65 ± 3.10 year old) were monitored with Global Positioning Systems and heart rate bands during 45-minutes games on 4 selected artificial turf systems. The results show more covered distance in high-intensity ranges on the system with lower levels of damping and higher rates of rotational traction (p ≤ 0.05). Likewise, this system of artificial turf demonstrated a high number of sprints (12.65 ± 5.67) and more elevated maximum speed peaks during the last part of the game (28.16 ± 2.90 km·h) in contrast to the systems with better damping capacity (p ≤ 0.05). On the other hand, the physiological load was similar across the 4 artificial turf systems (p > 0.05). Finally, the regression analysis demonstrated a significant influence of the mechanical properties of the surface on global distance (15.4%), number (12.6%), and maximum speed (16.6%) of the sprints. To conclude, the mechanical variability of the artificial turf systems resulted in differences in the activity profiles and the players' perceptions during simulated football games.

Efecto de un calendario sobrecargado de partidos sobre el rendimiento físico en el fútbol de élite / Efeito de um calendário sobrecargado no desempenho no futebol de elite / The influence of a congested fixture calendar on physical performance in elite soccer

El objetivo de este trabajo consiste en analizar el impacto de disputar una alta carga de minutos de competición a lo largo de una temporada sobre el rendimiento físico en el fútbol de elite. La distancia recorrida a distintas velocidades y el porcentaje de tiempo realizando actividades de alta intensidad por 68 jugadores que disputaron la Copa Mundial de Brasil 2014 de la FIFA fueron analizados. Un análisis de cluster clasificó a los jugadores en tres grupos dependiendo del número de minutos disputados a lo largo de la temporada: alta, media y baja carga de competición. El marcador, el nivel del oponente y el puesto específico de los jugadores se incorporaron en el análisis como variables de control. Los datos fueron analizados mediante de un análisis de regresión lineal. En general, los resultados sugieren que jugar una alta carga de minutos de competición durante la temporada no afecta negativamente al rendimiento físico de los jugadores. Los mediocentros recorrieron una distancia total y a alta intensidad mayor que el resto de puestos específicos (p< 0,01). Tener el marcador a favor o en contra y la fortaleza o debilidad del oponente no modificó significativamente el rendimiento físico de los jugadores. Estos resultados podrían ser utilizados por entrenadores y analistas para mejorar el diseño de tareas y la evaluación del rendimiento de los equipos y de los jugadores (AU)

O objetivo deste trabalho consiste analisar o impacto de uma elevada carga de minutos de jogo ao longo de uma época sobre o rendimento físico no futebol de elite. Foram analisadas, em 68 jogadores que disputaram o Campeonato Mundial do Brasil 2014 da FIFA, a distância percorrida a diferentes velocidades e a percentagem de tempo realizando atividades de alta intensidade. Uma análise de cluster classificou os jogadores em três grupos dependendo do número de minutos disputados ao longo da época: alta, média ou baixa carga de competição. O resultado, o nível da equipa adversária e a posição específica dos jogadores incorporaram a análise como variáveis de controlo. Os dados foram analisados mediante uma análise de regressão linear. No geral, os resultados demonstram que jogar uma elevada carga de minutos de jogo durante a época não afeta negativamente o rendimento físico dos jogadores. Os médios centro percorreram uma distância total e a alta intensidade maior que o resto dos jogadores das outras posições específicas (p< 0,01). Ter o resultado a favor ou contra e a capacidade ou debilidade do adversário não modificou significativamente o rendimento físico dos jogadores. Estes resultados poderão ser utilizados por treinadores e observadores/analistas para melhorar a planificação de treinos e a avaliação do rendimento das equipas e dos jogadores (AU)

The aim of this paper is to analyze the impact of playing a high amount of minutes in competition during the season on elite soccer performance. Distances covered at various speeds and the time spent in highintensity activities by 68 players that completed the entire match in the FIFA World Cup Brazil 2014 were examined. A k mean analysis classified the players according to the number of minutes played throughout the season: high, medium and low amount of minutes. Additional variables such as the scoreline, quality of the opponent and playing position were included. Data were examined through linear regression analysis. Overall, the results suggested that playing a high amount of minutes during the season does not affect physical performances in elite soccer. Central Midfielders covered higher total distances and distances covered at high speed than the other playing positions (p< 0.01). Winning or losing match status was not associated with changes on the physical performance profiles of the players. These results could be used by coaches and analysts to improve the design of assignment and the team and players performance assessment (AU)

How important is it to score a goal? The influence of the scoreline on match performance in elite soccer.

The goal of this study was to examine the effects of three different scorelines (1 Goal Up, Level Score, 1 Goal Down) on match performance indicators in elite soccer. Ball possession decreased when teams were 1 goal up. High Range Budget Clubs (HRBC) and Upper-Mid Range Budget Clubs (UMRBC) dominated possession against their opponents whether winning, losing, or drawing. Lower-Mid Range Budget Clubs (LMRBC) and Low Range Budget Clubs (LRBC) had less possession than HRBC. The probability of reaching the final one-third of the pitch decreased when teams were 1 goal up. LMRBC and LRBC had less match final third entries than HRBC. Similarly, shots on goal decreased when teams were 1 goal up. These findings could be used by coaches and match analysts when they evaluate performance and develop training drills.

Relationship between performance characteristics and the selection process in youth soccer players.

The purpose of this study was to establish the anthropometric and physical profiles of elite young soccer players according to their playing position, and to determine their relevance for the selection process. One hundred and fifty-six young male soccer players participated in the study. Players were classified into the following groups: Goalkeepers (n=16), Central Defenders (n=26), External Defenders (n=29), Central Midfielders (n=34), External Midfielders (n=28), and Forwards (n=23). Anthropometric variables of participants (body height, body mass, body mass index, 6 skinfolds, 4 diameters, and 3 perimeters) were measured. Participants performed the Yo-Yo test, sprint tests (30 m flat sprint and Balsom agility test) and 2 jump tests (countermovement jump and the Abalakov test). At the end of the season, the technical staff of the club selected some of the players to continue playing on the same team and the rest were not selected. The results show that heavier and taller outfield players performed better in vertical jumps and sprint tests, whereas leaner outfield players performed better in the Yo-Yo test. Fat percentage of selected players was lower than that of the non-selected ones. The rest of the body components were similar in the selected and non-selected players within each playing position. Moreover, the selected players performed slightly better than the non-selected players in the physical test, but these differences were not statistically significant.