The impact of competition effort on the vital capacity of football players according to the playing positions. by فراس عبدالحميد خالد

“…The researchers concluded that the match effort has an effect on the level of vital capacity for all  Players are in different playing lines and that effect on the level of vital capacity was varied according to  The lines of play and the lines most affected was the midfield, followed by the defense line, then the offensive line and finally the goalkeepers. …”
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Changes of physical match performance after the COVID-19 lockdown in professional soccer players according to their playing position by Łukasz Radzimiński, Miguel Lorenzo-Martinez, Marek Konefał, Paweł Chmura, Marcin Andrzejewski, Zbigniew Jastrzębski, Alexis Padrón-Cabo

“…A reduction in high-speed running was observed in central defenders (p < 0.05), central midfielders (p < 0.01) and forwards (p < 0.05). No significant decrease in sprinting or maximal running velocity was observed. …”
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Technical Performance of Ethiopian Male Soccer National Team by Esayas Zenbaba

“…Technical performance variables analysis included: Tackle, clearance Interception passes, pass accuracy, crosses, cross accuracy, corner, shot, shot accuracy and goal and players were categorized into three as defence, midfield, and striker based on their position. To this end data were statistically analysed by descriptive statistics, one sample t test and one-way ANOVA and significant is set at p lt;0.05. …”
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Composição corporal, somatotipo e aptidão física de jovens atletas de futebol de campo by Rodolfo A. Dellagrana, Cassiano R. Rech, Henrique A. R. da Fonseca, Edson I. Kaminagakura, Wagner de Campos

“…The defenders and forwards are heavier and with larger amount of lean body mass (LBM) than midfielders and sidewards, furthermore, the defenders are higher than other players. …”
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Blood Pressure and Heart Rate Responses to an Isokinetic Testing Protocol in Professional Soccer Players by Arturo Pérez-Gosalvez, Francisco García-Muro San José, Ofelia Carrión-Otero, Tomás Pérez-Fernández, Luis Fernández-Rosa

“…The HR of the defenders was higher than those of the forwards and midfielders but was independent of the competitive level. …”
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Youth-to-senior transition in women's and girls' football: Towards a better understanding of relative age effects and gender-specific considerations. by Paolo Riccardo Brustio, Roberto Modena, Gennaro Boccia, Matteo Vogliazzo, Adam Leigh Kelly

“…In Under 17, goalkeepers, defenders, and midfielders of Q1 players were overrepresented. However, Q4 players recorded higher conversion rates than Q1 (Q1 = 16.4% vs. …”
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Sports injuries in soccer according to tactical position: a retrospective survey by Giuliano Moreto Onaka, Jair José Gaspar-Jr, Dayana das Graças, Fernando Sérgio Silva Barbosa, Paula Felippe Martinez, Silvio Assis de Oliveira-Junior

“…Muscle injuries in the back region were the most registered sports injuries among midfielders, while muscle damages in lower limbs were the primary injuries registered for other line positions. …”
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A TIME-MOTION ANALYSIS OF THE FOOTBALL WORLD CUP IN RUSSIA 2018 by Petar Peev, Vasil Tsvetkov, Nestor Youroukov

“…As a result of the research, we found that the goalkeeper had total distance covered of 4061,59 meters; defenders had a 9352 meters; midfielders had a 10708 meters and strikers had a 9731 meters. …”
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The relative age effect in FIFA U-17 World Cup: The role of the playing position and the continent by ALI IŞIN, TUBA MELEKOĞLU

“…When the players’ positions are compared, a relative age effect was found in defenders, midfielders and forward players.…”

Key performance indicators at FIFA Women's World Cup in different playing surfaces. by Jorge Garcia-Unanue, Alvaro Fernandez-Luna, Alvaro Fernandez-Luna, Pablo Burillo, Leonor Gallardo, Javier Sanchez-Sanchez, Samuel Manzano-Carrasco, Jose Luis Felipe

“…The variables were calculated for the total sample and independently by positions (defense, midfielders and forwards) for matches on natural grass (2011) and artificial turf (2015). …”
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Anthropometric and Hematological Profile of some selected Ethiopian Premier League Male Soccer Players in the Final Competitive Season by Ayichew Abay, Wondiye Aychiluhim

“…Further a statistically significant change was observed is only WBC, RBC and MCH hematological variables were observed when compared among the different playing positions (Goalkeepers, defenders, midfielders and attackers). It was concluded that there is no significant difference in anthropometric, physiological and hematological variables except (WBC, RBC and MCH) soccer players between playing position, although the values of the measured hematological parameters fell within the reference range. …”
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Accelerometry-based variables in professional soccer players: Comparisons between periods of the season and playing positions by Filipe Clemente, Rui Silva, Rodrigo Ramirez-Campillo, José Afonso, Bruno Mendes, Yung-Sheng Chen

“…Comparisons between playing positions showed that midfielders had the highest weekly acute load of HMLD (6901 arbitrary units [AU]), while central defenders had the lowest (4986 AU). …”
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Difference in sprinting stiffness, peak power, peak force and peak velocity between soccer players in different game positions by Oh, Jun Wei

“…The objective of this study is to investigate if there is any difference in the sprinting stiffness (Kvert and Kleg) and peak FVP between three groups of soccer players: Defenders (DEF), Midfielders (MID) and Attackers (ATT), and to help with categorization of soccer players using sprinting stiffness and peak FVP. …”
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Relationship between fluid loss variation and physical activity during official games in elite soccer players. [Relaciones entre la variación de pérdida de líquidos y la actividad... by Leo Djaoui, Vincent Pialoux, Emmanuel Vallance, Adam Owen, Alexandre Dellal

“…The aim of the present study was to analyse the relationships between fluid ingestion, changes in body mass and physical activity amongst elite soccer players. 32 elite French soccer players were divided into six playing positions: goalkeepers (GK), central defenders (CD), full backs (FB), central midfielders (CM), wide midfielders (WM) and forwards (FW) and participated in official friendly matches within two consecutive pre-season periods. …”
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General perceptual-cognitive abilities: Age and position in soccer. by Nils Schumacher, Mike Schmidt, Kai Wellmann, Klaus-Michael Braumann

“…Further, we found statistical tendencies for group differences regarding the visual reaction time (VRT), indicating that midfielders outperform defenders and strikers in simple reaction tasks. …”
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Comparisons Of Weekly Training Volumes Across A Season In Collegiate Female Lacrosse Athletes by Monica Wojciechowski, Claire Schumann, Jennifer Bunn

“…Data were collected via wearable microtechnology across a total of 17 games and 64 training sessions on a total of 15 participants (attackers n=5, midfielders n=5, defenders n=5). ACWRs were calculated weekly by dividing the workload from the past seven days by the workload from the past 28 days for each metric. …”
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Medical Checks for Professional Football Players in Franceville, Gabon by Hervé Martial Ekomy, Joefred Mbogho Abogo, Herman Begouabe, Armel Kinga, Brice Angwe Eboue, Laetitia Pauline Abang Ekouaghe, Jayanta Karmakar, Cedric Sima Obiang

“…Metabolic, inflammatory, infectious, electrolyte and anaemia syndromes were found in 22.64%, 24.53%, 19.81%, 7.55% and 12.26%, respectively. Midfielders and defenders have shown the greatest changes in biological parameters. …”
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A View of the CP/DP-(non)parallelism from the Cartographic Perspective by Christopher Laenzlinger

“…An example of structural parallelism lies in the division of the clause and the noun phrase into three domains: (i) the Nachfeld (right periphery), which is the thematic domain; (ii) the Mittelfeld (midfield), which is the inflection, agreement, Case and modification domain and (iii) the Vorfeld (left periphery), which is the discourse- and operator-related domain. …”
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Classified metabolic power-based measures in professional football players: comparison between playing positions and match period by Zeki Akyildiz, Erhan Çene, Coşkun Parim, Onat Çetin, Çağatay Turan, Yılmaz Yüksel, Rui Silva, Ana Filipa Silva, Hadi Nobari

“…Results Significant between-position differences were observed for IP (p: 0.000; d: 0.284), HP (p ≤ 0.001; d = 0.45), EP (p ≤ 0.001; d = 0.44), and for MP (p ≤ 0.001; d = 0.56), with the central defenders (CD) showing the lower values, and the central midfielders (CM) showing the higher values for the overall measures. …”
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Exercise intensity during official soccer matches by Daniel Barbosa Coelho, Rodney Coelho da Paixão, Emerson Cruz de Oliveira, Lenice Kappes Becker, João Batista Ferreira-Júnior, Leonardo Gomes Coelho, João Carlos Dias, Emerson Silami-Garcia

“…The aims of the study were: 1) to analyze the exercise intensity in several phases (six phases of 15 min) of soccer matches; 2) to compare the match time spent above anaerobic threshold (AT) between different age groups (U-17 and U-20); and 3) to compare the match time spent above AT between players’ positions (backs, midfielders, forwards and wingabcks). Forty-four male soccer players were analyzed. …”
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