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Resumen El fútbol como disciplina ha sido objeto de numerosas investigaciones que han permitido la potenciación de las cualidades de las personas deportistas para alcanzar el máximo rendimiento deportivo. El uso de nuevas herramientas ha permitido mejorar los procesos de selección de talentos y el desarrollo de las capacidades físicas, como es el caso de la dermatoglifia, que brinda información del genotipo de un individuo. El presente estudio pretende relacionar la composición corporal, la dermatoglifia y el consumo máximo de oxígeno en jugadores de fútbol categoría sub 20. La investigación fue cuantitativa, diseño no experimental, de tipo transversal. La muestra estuvo conformada por 22 futbolistas (edad 18 ± 1.1) de un club deportivo de Bogotá, a ellos se les realizó una valoración de composición corporal, se les calculó el somatotipo, se analizaron las huellas de las manos y se midió el consumo máximo de oxígeno con el Test Course Navette. Los resultados muestran predominio del somatotipo mesomorfo balanceado (53%), alta presencia de presillas "L" (66.36%), baja presencia de arcos "A" (1.82%) y un consumo máximo de oxígeno de 53.76 ± 3.73 ml/kg/min. Además, se encontraron relaciones significativas entre componentes dermatoglíficos D10-SCTL y el somatotipo endomorfo (p < 0.05), y entre el VO₂ máximo con somatotipo endomorfo y ectomorfo (p < 0.05). Se concluye que los futbolistas se caracterizan por tener una predisposición hacia la coordinación, la resistencia y la agilidad.

Abstract Soccer has generated endless research that has enhanced athlete's qualities to achieve maximum sports performance. According to the above, the use of new tools has been implemented to improve talent selection processes and develop physical abilities, as is the case with dermatoglyphics that provides information on an individual's genotype. The present study aims to relate body composition, dermatoglyphics, and maximum oxygen consumption in soccer players' category sub-20. The research had a quantitative, non-experimental, cross-sectional design. The sample comprised 22 players (age 18±1.1) from Bogota Sports Club, Colombia. They were assessed for body composition, the somatotype was calculated, handprints were analyzed, and the maximum oxygen consumption was measured with the Test Course Navette. The results show a predominance of balanced mesomorph somatotype (53%), high presence of "L" ridges (66.36 %), low presence of "A" arches (1.82%), and maximum oxygen consumption of 53.76±3.73 ml/kg/min. Furthermore, significant relationships were found between D10-SCTL dermatoglyphic components and the endomorph somatotype (p <0.05), and between the maximum VO₂ with endomorph and ectomorph somatotype (p <0.05). It is concluded that soccer players are characterized by having a predisposition towards coordination, resistance, and agility.

Resumo O futebol como disciplina tem sido objeto de inúmeras investigações que permitiram melhorar as qualidades dos desportistas para alcançar o máximo desempenho desportivo. A utilização de novas ferramentas tornou possível melhorar os processos de seleção de talentos e o desenvolvimento de capacidades físicas, como a dermatoglifia, que fornece informações sobre o genótipo de um indivíduo. O presente estudo visa relacionar a composição corporal, dermatoglifos e o consumo máximo de oxigênio nos jogadores de futebol sub-20. A pesquisa foi quantitativa, não-experimental e transversal. A amostra consistiu em 22 jogadores de futebol (18 ± 1,1 anos) de um clube desportivo de Bogotá, que foram submetidos a uma avaliação da composição corporal, foi calculado o somatotipo, foram analisadas as impressões digitais das mãos e foi medido o consumo máximo de oxigénio através do teste Course Navette. Os resultados mostram uma predominância do somatotipo mesomorfo balanceado (53%), presença elevada de presilha em "L" (66,36%), baixa presença de arcos em "A" (1,82%) e um consumo máximo de oxigênio de 53,76 ± 3,73 ml/kg/min. Além disso, foram encontradas relações significativas entre os componentes dermatoglíficos D10-SCTL e o somatotipo endomorfo (p < 0,05), e entre VO₂ máximo com somatotipo endomorfo e ectomorfo (p < 0,05). Conclui-se que os jogadores de futebol são caracterizados por uma predisposição para a coordenação, resistência e agilidade.

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The recruitment of athletes with limited resources is a global problem in professional sports. In US Major League Baseball, the experience of the Oakland Athletics' general manager in the last decade turned his "Moneyball" model into a synonym of quantitative analysis in the transfer market of baseball players. His strategy focused on hiring players with outstanding technical skills but relatively low market value. This study adapted this model to the framework of a multiple criteria decision aid (MCDA), by selecting undervalued players who have complementary abilities. The novelty here refers to the joint use of four algorithms explored by the composition of probabilistic preferences (CPP) (i.e., ranking, classification, dynamic evaluation and regularity analysis) and their application to soccer player performance evaluation. The new model analysed the recent transfer of a left-back soccer player to Europe. The results indicated 12 opportunities for better investment, among 32 left and right-back players considered. Two years later, the value of the same player was considerably lower. He played only five matches in the 2018-2019 season, without scoring or providing any assists. On the other hand, the players better classified by the CPP-MB model presented higher performances and market values.

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INTRODUCTION: Introduction: given the characteristics of soccer, the tendency in the selection of these athletes and their allocation in certain game positions has been conditioned by the morphological characteristics that they present, so that the knowledge of anthropometric particularities by playing position is a relevant antecedent for the technical bodies of professional football. The objective of the present investigation is to identify and compare the anthropometric characteristics by playing position of Chilean professional soccer players. Methods: a total of 390 professional male soccer players, from 15 Chilean professional clubs, were evaluated morphologically by means of the measurement of 25 anthropometric variables, with which the body composition, the somatotype and the Z-score of Phantom were estimated. A Chi-square test with significance level of p < 0.05 was used to compare the variables between groups using SPSS software others players (greater adipose and muscular mass). As for a sample of active subjects, soccer players have a significantly different body composition, similarly occurs when compared to Phantom, where height, weight and muscle mass are greater and fat mass is lower. Conclusion: professional footballers differ by game position compared to other non-sports players and Phantom.

INTRODUCCIÓN: Introducción: dadas las características del fútbol, la tendencia en la selección de estos deportistas y su asignación en determinadas posiciones de juego se han visto condicionadas por las características morfológicas que estos presenten, por lo que el conocimiento de las particularidades antropométricas por posición de juego es un antecedente relevante para los cuerpos técnicos del fútbol de élite. El objetivo de la presente investigación es identificar y comparar las características antropométricas por posición de juego de jugadores de fútbol profesional chileno. Métodos: un total de 390 futbolistas profesionales varones, pertenecientes a 15 clubes profesionales chilenos, fueron evaluados morfológicamente mediante la medición de 25 variables antropométricas, con las que se estimaron la composición corporal, el somatótipo y los Z-score de Phantom. Para la comparación de las variables entre los grupos se utilizó una prueba Chi-cuadrado con nivel de significancia de p < 0,05, utilizando el software SPSS versión 21. Resultados: se observan diferencias entre las posiciones de juego, especialmente entre los porteros y el resto de los jugadores (p < 0,001), quienes presentan más de 2 kg de masa muscular y más de 1,8 kg de masa adiposa, frente a las otras posiciones de juego. Respecto de una muestra se sujetos activos, los futbolistas presentan una composición corporal significativamente distinta; de igual manera ocurre al comparar con Phantom, donde la estatura, el peso y la masa muscular son mayores y la masa adiposa es menor. Conclusión: los futbolistas profesionales presentan diferencias por posición de juego y en comparación a otros sujetos no deportistas y a Phantom.

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Resumen El objetivo del presente trabajo fue analizar las relaciones entre tipos de liderazgo (tarea y social), cohesión, potencia de equipo y rendimiento en 334 futbolistas federados de las categorías Alevín, Cadete, Juvenil y Absoluta, con una edad media de 15.97 (DE = 3.31). Los cuestionarios utilizados fueron de Liderazgo auténtico (ALQ), tarea (LSS), Cohesión grupal (CG), Potencia de equipo (CPEA) y rendimiento, que mostraron índices de ajuste óptimos (χ2/DF = 1.313 p = 0; CFI = 0.997; TLI = 0.994; RMSEA = 0.032; SRMS = 0.0343). Los resultados indican que el estilo de liderazgo, especialmente liderazgo tarea (p = 0.37) influye indirectamente en el rendimiento a través de la CG (p = 0.17) y CPE (p = 0.21). Como conclusión, se propone la mejora del rendimiento grupal a partir de la optimización de modelos de conducta individuales.

Abstract The objective was to analyze the relationships between types of leadership (task and social), cohesion, team potency and performance in 334 federated players of the categories Alevín, Cadet, Juvenile and Absolute, with a mean age of 15.97 (SD = 3.31). The questionnaires used were Authentic Leadership (ALQ), Task (LSS), Group Cohesion (CG), Team Power (CPEA), and Performance that showed optimal adjustment indexes (χ2 / DF = 1.313 p = 0; CFI = 0.997; TLI = 0.994; RMSEA = 0.032; SRMS = 0.0343). The results indicate that leadership style, especially leadership task (p = 0.37) indirectly influences performance through CG (p = 0.17) and CPE (p = 0.21). In conclusion, it is proposed to improve group performance by optimizing individual behavior models.

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The purposes of this study were to investigate sprints and to characterize repeated-sprint sequences (RS) performed by athletes during professional futsal matches. We analyzed 97 players during 5 official matches using the DVideo automatic tracking system. The sprints were analyzed during the first and second halves according to playing position, and RS were categorized according to the number of sprints and the time between them. The results showed an increase (F[1, 2520] = 3.96; P = .046) in the sprint duration from the first (mean = 3.1 ± 1.3) to the second half (mean = 3.2 ± 1.2). However, no differences were found for other variables (distance covered, peak velocity, initial velocity, recovery time between sprints, and sprints performed per minute) or among playing positions. In addition, when considering RS, the results showed that RS comprising two sprints interspersed with a maximum of 15 seconds of recovery were significantly more frequent than other RS. The findings of this study characterizing the sprinting features of futsal players can help coaches to plan physical training and assessments according to the requirements of the sport.

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